Merge remote branch 'origin/gallium-st-api'

38 files changed, 2807 insertions, 798 deletions

diff --git a/src/gallium/include/state_tracker/st_api.h b/src/gallium/include/state_tracker/st_api.h
new file mode 100644
index 0000000000..70ad215bfc
--- /dev/null
+++ b/src/gallium/include/state_tracker/st_api.h
@@ -0,0 +1,407 @@
+/**********************************************************
+ * Copyright 2010 VMware, Inc.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ **********************************************************/
+
+
+#ifndef _ST_API_H_
+#define _ST_API_H_
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_format.h"
+
+/**
+ * \file API for communication between state trackers and state tracker
+ * managers.
+ *
+ * While both are state tackers, we use the term state tracker for rendering
+ * APIs such as OpenGL or OpenVG, and state tracker manager for window system
+ * APIs such as EGL or GLX in this file.
+ *
+ * This file defines an API to be implemented by both state trackers and state
+ * tracker managers.
+ */
+
+/**
+ * The entry points of the state trackers.
+ */
+#define ST_MODULE_OPENGL_SYMBOL      "st_module_OpenGL"
+#define ST_MODULE_OPENGL_ES1_SYMBOL  "st_module_OpenGL_ES1"
+#define ST_MODULE_OPENGL_ES2_SYMBOL  "st_module_OpenGL_ES2"
+#define ST_MODULE_OPENVG_SYMBOL      "st_module_OpenVG"
+
+/**
+ * The supported rendering API of a state tracker.
+ */
+enum st_api_type {
+   ST_API_OPENGL,
+   ST_API_OPENGL_ES1,
+   ST_API_OPENGL_ES2,
+   ST_API_OPENVG,
+
+   ST_API_COUNT
+};
+
+/**
+ * Used in st_context_iface->teximage.
+ */
+enum st_texture_type {
+   ST_TEXTURE_1D,
+   ST_TEXTURE_2D,
+   ST_TEXTURE_3D,
+   ST_TEXTURE_RECT,
+};
+
+/**
+ * Available attachments of framebuffer.
+ */
+enum st_attachment_type {
+   ST_ATTACHMENT_FRONT_LEFT,
+   ST_ATTACHMENT_BACK_LEFT,
+   ST_ATTACHMENT_FRONT_RIGHT,
+   ST_ATTACHMENT_BACK_RIGHT,
+   ST_ATTACHMENT_DEPTH_STENCIL,
+   ST_ATTACHMENT_ACCUM,
+   ST_ATTACHMENT_SAMPLE,
+
+   ST_ATTACHMENT_COUNT,
+   ST_ATTACHMENT_INVALID = -1
+};
+
+/* for buffer_mask in st_visual */
+#define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
+#define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
+#define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
+#define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
+#define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
+#define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
+#define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
+
+/**
+ * Enumerations of state tracker context resources.
+ */
+enum st_context_resource_type {
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
+   ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
+   ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
+   ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE,
+};
+
+/**
+ * The return type of st_api->get_proc_address.
+ */
+typedef void (*st_proc_t)(void);
+
+struct pipe_context;
+struct pipe_texture;
+struct pipe_fence_handle;
+
+/**
+ * Used in st_context_iface->get_resource_for_egl_image.
+ */
+struct st_context_resource
+{
+   /* these fields are filled by the caller */
+   enum st_context_resource_type type;
+   void *resource;
+
+   /* this is owned by the caller */
+   struct pipe_texture *texture;
+};
+
+/**
+ * Used in st_manager_iface->get_egl_image.
+ */
+struct st_egl_image
+{
+   /* these fields are filled by the caller */
+   struct st_context_iface *stctxi;
+   void *egl_image;
+
+   /* this is owned by the caller */
+   struct pipe_texture *texture;
+
+   unsigned face;
+   unsigned level;
+   unsigned zslice;
+};
+
+/**
+ * Represent the visual of a framebuffer.
+ */
+struct st_visual
+{
+   /**
+    * Available buffers.  Tested with ST_FRAMEBUFFER_*_MASK.
+    */
+   unsigned buffer_mask;
+
+   /**
+    * Buffer formats.  The formats are always set even when the buffer is
+    * not available.
+    */
+   enum pipe_format color_format;
+   enum pipe_format depth_stencil_format;
+   enum pipe_format accum_format;
+   int samples;
+
+   /**
+    * Desired render buffer.
+    */
+   enum st_attachment_type render_buffer;
+};
+
+/**
+ * Represent a windowing system drawable.
+ *
+ * The framebuffer is implemented by the state tracker manager and
+ * used by the state trackers.
+ *
+ * Instead of the winsys pokeing into the API context to figure
+ * out what buffers that might be needed in the future by the API
+ * context, it calls into the framebuffer to get the textures.
+ *
+ * This structure along with the notify_invalid_framebuffer
+ * allows framebuffers to be shared between different threads
+ * but at the same make the API context free from thread
+ * syncronisation primitves, with the exception of a small
+ * atomic flag used for notification of framebuffer dirty status.
+ *
+ * The thread syncronisation is put inside the framebuffer
+ * and only called once the framebuffer has become dirty.
+ */
+struct st_framebuffer_iface
+{
+   /**
+    * Available for the state tracker manager to use.
+    */
+   void *st_manager_private;
+
+   /**
+    * The visual of a framebuffer.
+    */
+   const struct st_visual *visual;
+
+   /**
+    * Flush the front buffer.
+    *
+    * On some window systems, changes to the front buffers are not immediately
+    * visible.  They need to be flushed.
+    *
+    * @att is one of the front buffer attachments.
+    */
+   boolean (*flush_front)(struct st_framebuffer_iface *stfbi,
+                          enum st_attachment_type statt);
+
+   /**
+    * The state tracker asks for the textures it needs.
+    *
+    * It should try to only ask for attachments that it currently renders
+    * to, thus allowing the winsys to delay the allocation of textures not
+    * needed. For example front buffer attachments are not needed if you
+    * only do back buffer rendering.
+    *
+    * The implementor of this function needs to also ensure
+    * thread safty as this call might be done from multiple threads.
+    *
+    * The returned textures are owned by the caller.  They should be
+    * unreferenced when no longer used.  If this function is called multiple
+    * times with different sets of attachments, those buffers not included in
+    * the last call might be destroyed.  This behavior might change in the
+    * future.
+    */
+   boolean (*validate)(struct st_framebuffer_iface *stfbi,
+                       const enum st_attachment_type *statts,
+                       unsigned count,
+                       struct pipe_texture **out);
+};
+
+/**
+ * Represent a rendering context.
+ *
+ * This entity is created from st_api and used by the state tracker manager.
+ */
+struct st_context_iface
+{
+   /**
+    * Available for the state tracker and the manager to use.
+    */
+   void *st_context_private;
+   void *st_manager_private;
+
+   /**
+    * Destroy the context.
+    */
+   void (*destroy)(struct st_context_iface *stctxi);
+
+   /**
+    * Invalidate the current textures that was taken from a framebuffer.
+    *
+    * The state tracker manager calls this function to let the rendering
+    * context know that it should update the textures it got from
+    * st_framebuffer_iface::validate.  It should do so at the latest time possible.
+    * Possible right before sending triangles to the pipe context.
+    *
+    * For certain platforms this function might be called from a thread other
+    * than the thread that the context is currently bound in, and must
+    * therefore be thread safe. But it is the state tracker manager's
+    * responsibility to make sure that the framebuffer is bound to the context
+    * and the API context is current for the duration of this call.
+    *
+    * Thus reducing the sync primitive needed to a single atomic flag.
+    */
+   void (*notify_invalid_framebuffer)(struct st_context_iface *stctxi,
+                                      struct st_framebuffer_iface *stfbi);
+
+   /**
+    * Flush all drawing from context to the pipe also flushes the pipe.
+    */
+   void (*flush)(struct st_context_iface *stctxi, unsigned flags,
+                 struct pipe_fence_handle **fence);
+
+   /**
+    * Replace the texture image of a texture object at the specified level.
+    *
+    * This function is optional.
+    */
+   boolean (*teximage)(struct st_context_iface *stctxi, enum st_texture_type target,
+                       int level, enum pipe_format internal_format,
+                       struct pipe_texture *tex, boolean mipmap);
+
+   /**
+    * Used to implement glXCopyContext.
+    */
+   void (*copy)(struct st_context_iface *stctxi,
+                struct st_context_iface *stsrci, unsigned mask);
+
+   /**
+    * Look up and return the info of a resource for EGLImage.
+    *
+    * This function is optional.
+    */
+   boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
+                                         struct st_context_resource *stres);
+};
+
+
+/**
+ * Represent a state tracker manager.
+ *
+ * This interface is implemented by the state tracker manager.  It corresponds
+ * to a "display" in the window system.
+ */
+struct st_manager
+{
+   struct pipe_screen *screen;
+
+   /**
+    * Look up and return the info of an EGLImage.
+    *
+    * This function is optional.
+    */
+   boolean (*get_egl_image)(struct st_manager *smapi,
+                            struct st_egl_image *stimg);
+};
+
+/**
+ * Represent a rendering API such as OpenGL or OpenVG.
+ *
+ * Implemented by the state tracker and used by the state tracker manager.
+ */
+struct st_api
+{
+   /**
+    * Destroy the API.
+    */
+   void (*destroy)(struct st_api *stapi);
+
+   /**
+    * Return an API entry point.
+    *
+    * For GL this is the same as _glapi_get_proc_address.
+    */
+   st_proc_t (*get_proc_address)(struct st_api *stapi, const char *procname);
+
+   /**
+    * Return true if the visual is supported by the state tracker.
+    */
+   boolean (*is_visual_supported)(struct st_api *stapi,
+                                  const struct st_visual *visual);
+
+   /**
+    * Create a rendering context.
+    */
+   struct st_context_iface *(*create_context)(struct st_api *stapi,
+                                              struct st_manager *smapi,
+                                              const struct st_visual *visual,
+                                              struct st_context_iface *stsharei);
+
+   /**
+    * Bind the context to the calling thread with draw and read as drawables.
+    *
+    * The framebuffers might have different visuals than the context does.
+    */
+   boolean (*make_current)(struct st_api *stapi,
+                           struct st_context_iface *stctxi,
+                           struct st_framebuffer_iface *stdrawi,
+                           struct st_framebuffer_iface *streadi);
+
+   /**
+    * Get the currently bound context in the calling thread.
+    */
+   struct st_context_iface *(*get_current)(struct st_api *stapi);
+};
+
+/**
+ * Represent a state tracker.
+ *
+ * This is the entry point of a state tracker.
+ */
+struct st_module
+{
+   enum st_api_type api;
+   struct st_api *(*create_api)(void);
+};
+
+/**
+ * Return true if the visual has the specified buffers.
+ */
+static INLINE boolean
+st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
+{
+   return ((visual->buffer_mask & mask) == mask);
+}
+
+/* these symbols may need to be dynamically lookup up */
+extern PUBLIC const struct st_module st_module_OpenGL;
+extern PUBLIC const struct st_module st_module_OpenGL_ES1;
+extern PUBLIC const struct st_module st_module_OpenGL_ES2;
+extern PUBLIC const struct st_module st_module_OpenVG;
+
+#endif /* _ST_API_H_ */
diff --git a/src/gallium/state_trackers/dri/dri_context.c b/src/gallium/state_trackers/dri/dri_context.c
index 9811f8cf43..f772ba5d16 100644
--- a/src/gallium/state_trackers/dri/dri_context.c
+++ b/src/gallium/state_trackers/dri/dri_context.c
@@ -35,7 +35,6 @@
 #include "state_tracker/drm_api.h"
 #include "state_tracker/dri1_api.h"
 #include "state_tracker/st_public.h"
-#include "state_tracker/st_context.h"
 #include "pipe/p_context.h"
 
 #include "dri_context.h"
diff --git a/src/gallium/state_trackers/dri/dri_drawable.c b/src/gallium/state_trackers/dri/dri_drawable.c
index 458473853c..c400725c7f 100644
--- a/src/gallium/state_trackers/dri/dri_drawable.c
+++ b/src/gallium/state_trackers/dri/dri_drawable.c
@@ -39,8 +39,8 @@
 #include "main/renderbuffer.h"
 #include "state_tracker/drm_api.h"
 #include "state_tracker/dri1_api.h"
-#include "state_tracker/st_public.h"
 #include "state_tracker/st_context.h"
+#include "state_tracker/st_public.h"
 #include "state_tracker/st_cb_fbo.h"
 
 #include "util/u_format.h"
diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c b/src/gallium/state_trackers/egl/common/egl_g3d.c
index e4972d493d..5eabe10558 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
@@ -36,234 +36,27 @@
 
 #include "native.h"
 #include "egl_g3d.h"
+#include "egl_g3d_st.h"
 #include "egl_g3d_image.h"
-#include "egl_st.h"
-
-/**
- * Validate the draw/read surfaces of the context.
- */
-static void
-egl_g3d_validate_context(_EGLDisplay *dpy, _EGLContext *ctx)
-{
-   struct egl_g3d_display *gdpy = egl_g3d_display(dpy);
-   struct pipe_screen *screen = gdpy->native->screen;
-   struct egl_g3d_context *gctx = egl_g3d_context(ctx);
-   const uint st_att_map[NUM_NATIVE_ATTACHMENTS] = {
-      ST_SURFACE_FRONT_LEFT,
-      ST_SURFACE_BACK_LEFT,
-      ST_SURFACE_FRONT_RIGHT,
-      ST_SURFACE_BACK_RIGHT,
-   };
-   EGLint num_surfaces, s;
-
-   /* validate draw and/or read buffers */
-   num_surfaces = (gctx->base.ReadSurface == gctx->base.DrawSurface) ? 1 : 2;
-   for (s = 0; s < num_surfaces; s++) {
-      struct pipe_texture *textures[NUM_NATIVE_ATTACHMENTS];
-      struct egl_g3d_surface *gsurf;
-      struct egl_g3d_buffer *gbuf;
-      EGLint att;
-
-      if (s == 0) {
-         gsurf = egl_g3d_surface(gctx->base.DrawSurface);
-         gbuf = &gctx->draw;
-      }
-      else {
-         gsurf = egl_g3d_surface(gctx->base.ReadSurface);
-         gbuf = &gctx->read;
-      }
-
-      if (!gctx->force_validate) {
-         unsigned int seq_num;
-
-         gsurf->native->validate(gsurf->native, gbuf->attachment_mask,
-               &seq_num, NULL, NULL, NULL);
-         /* skip validation */
-         if (gsurf->sequence_number == seq_num)
-            continue;
-      }
-
-      pipe_surface_reference(&gsurf->render_surface, NULL);
-      memset(textures, 0, sizeof(textures));
-
-      gsurf->native->validate(gsurf->native, gbuf->attachment_mask,
-            &gsurf->sequence_number, textures,
-            &gsurf->base.Width, &gsurf->base.Height);
-      for (att = 0; att < NUM_NATIVE_ATTACHMENTS; att++) {
-         struct pipe_texture *pt = textures[att];
-         struct pipe_surface *ps;
-
-         if (native_attachment_mask_test(gbuf->attachment_mask, att) && pt) {
-            ps = screen->get_tex_surface(screen, pt, 0, 0, 0,
-                  PIPE_BUFFER_USAGE_GPU_READ |
-                  PIPE_BUFFER_USAGE_GPU_WRITE);
-            gctx->stapi->st_set_framebuffer_surface(gbuf->st_fb,
-                  st_att_map[att], ps);
-
-            if (gsurf->render_att == att)
-               pipe_surface_reference(&gsurf->render_surface, ps);
-
-            pipe_surface_reference(&ps, NULL);
-            pipe_texture_reference(&pt, NULL);
-         }
-      }
-
-      gctx->stapi->st_resize_framebuffer(gbuf->st_fb,
-            gsurf->base.Width, gsurf->base.Height);
-   }
-
-   gctx->force_validate = EGL_FALSE;
-
-}
-
-/**
- * Create a st_framebuffer.
- */
-static struct st_framebuffer *
-create_framebuffer(_EGLContext *ctx, _EGLSurface *surf)
-{
-   struct egl_g3d_context *gctx = egl_g3d_context(ctx);
-   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
-   struct egl_g3d_config *gconf = egl_g3d_config(gsurf->base.Config);
-
-   return gctx->stapi->st_create_framebuffer(&gconf->native->mode,
-         gconf->native->color_format, gconf->native->depth_format,
-         gconf->native->stencil_format,
-         gsurf->base.Width, gsurf->base.Height, &gsurf->base);
-}
-
-/**
- * Update the attachments of draw/read surfaces.
- */
-static void
-egl_g3d_route_context(_EGLDisplay *dpy, _EGLContext *ctx)
-{
-   struct egl_g3d_context *gctx = egl_g3d_context(ctx);
-   EGLint s;
-
-   /* route draw and read buffers' attachments */
-   for (s = 0; s < 2; s++) {
-      struct egl_g3d_surface *gsurf;
-      struct egl_g3d_buffer *gbuf;
-
-      if (s == 0) {
-         gsurf = egl_g3d_surface(gctx->base.DrawSurface);
-         gbuf = &gctx->draw;
-      }
-      else {
-         gsurf = egl_g3d_surface(gctx->base.ReadSurface);
-         gbuf = &gctx->read;
-      }
-
-      gbuf->attachment_mask = (1 << gsurf->render_att);
-
-      /* FIXME OpenGL defaults to draw the front or back buffer when the
-       * context is single-buffered or double-buffered respectively.  In EGL,
-       * however, the buffer to be drawn is determined by the surface, instead
-       * of the context.  As a result, rendering to a pixmap surface with a
-       * double-buffered context does not work as expected.
-       *
-       * gctx->stapi->st_draw_front_buffer(gctx->st_ctx, natt ==
-       *    NATIVE_ATTACHMENT_FRONT_LEFT);
-       */
-
-      /*
-       * FIXME If the back buffer is asked for here, and the front buffer is
-       * later needed by the client API (e.g. glDrawBuffer is called to draw
-       * the front buffer), it will create a new pipe texture and draw there.
-       * One fix is to ask for both buffers here, but it would be a waste if
-       * the front buffer is never used.  A better fix is to add a callback to
-       * the pipe screen with context private (just like flush_frontbuffer).
-       */
-   }
-}
-
-/**
- * Reallocate the context's framebuffers after draw/read surfaces change.
- */
-static EGLBoolean
-egl_g3d_realloc_context(_EGLDisplay *dpy, _EGLContext *ctx)
-{
-   struct egl_g3d_context *gctx = egl_g3d_context(ctx);
-   struct egl_g3d_surface *gdraw = egl_g3d_surface(gctx->base.DrawSurface);
-   struct egl_g3d_surface *gread = egl_g3d_surface(gctx->base.ReadSurface);
-
-   /* unreference the old framebuffers */
-   if (gctx->draw.st_fb) {
-      EGLBoolean is_equal = (gctx->draw.st_fb == gctx->read.st_fb);
-      void *priv;
-
-      priv = gctx->stapi->st_framebuffer_private(gctx->draw.st_fb);
-      if (!gdraw || priv != (void *) &gdraw->base) {
-         gctx->stapi->st_unreference_framebuffer(gctx->draw.st_fb);
-         gctx->draw.st_fb = NULL;
-         gctx->draw.attachment_mask = 0x0;
-      }
-
-      if (is_equal) {
-         gctx->read.st_fb = NULL;
-         gctx->draw.attachment_mask = 0x0;
-      }
-      else {
-         priv = gctx->stapi->st_framebuffer_private(gctx->read.st_fb);
-         if (!gread || priv != (void *) &gread->base) {
-            gctx->stapi->st_unreference_framebuffer(gctx->read.st_fb);
-            gctx->read.st_fb = NULL;
-            gctx->draw.attachment_mask = 0x0;
-         }
-      }
-   }
-
-   if (!gdraw)
-      return EGL_TRUE;
-
-   /* create the draw fb */
-   if (!gctx->draw.st_fb) {
-      gctx->draw.st_fb = create_framebuffer(&gctx->base, &gdraw->base);
-      if (!gctx->draw.st_fb)
-         return EGL_FALSE;
-   }
-
-   /* create the read fb */
-   if (!gctx->read.st_fb) {
-      if (gread != gdraw) {
-         gctx->read.st_fb = create_framebuffer(&gctx->base, &gread->base);
-         if (!gctx->read.st_fb) {
-            gctx->stapi->st_unreference_framebuffer(gctx->draw.st_fb);
-            gctx->draw.st_fb = NULL;
-            return EGL_FALSE;
-         }
-      }
-      else {
-         /* there is no st_reference_framebuffer... */
-         gctx->read.st_fb = gctx->draw.st_fb;
-      }
-   }
-
-   egl_g3d_route_context(dpy, &gctx->base);
-   gctx->force_validate = EGL_TRUE;
-
-   return EGL_TRUE;
-}
 
 /**
  * Return the state tracker for the given context.
  */
-static const struct egl_g3d_st *
+static struct st_api *
 egl_g3d_choose_st(_EGLDriver *drv, _EGLContext *ctx)
 {
    struct egl_g3d_driver *gdrv = egl_g3d_driver(drv);
-   const struct egl_g3d_st *stapi;
+   struct st_api *stapi;
    EGLint idx = -1;
 
    switch (ctx->ClientAPI) {
    case EGL_OPENGL_ES_API:
       switch (ctx->ClientVersion) {
       case 1:
-         idx = EGL_G3D_ST_OPENGL_ES;
+         idx = ST_API_OPENGL_ES1;
          break;
       case 2:
-         idx = EGL_G3D_ST_OPENGL_ES2;
+         idx = ST_API_OPENGL_ES2;
          break;
       default:
          _eglLog(_EGL_WARNING, "unknown client version %d",
@@ -272,10 +65,10 @@ egl_g3d_choose_st(_EGLDriver *drv, _EGLContext *ctx)
       }
       break;
    case EGL_OPENVG_API:
-      idx = EGL_G3D_ST_OPENVG;
+      idx = ST_API_OPENVG;
       break;
    case EGL_OPENGL_API:
-      idx = EGL_G3D_ST_OPENGL;
+      idx = ST_API_OPENGL;
       break;
    default:
       _eglLog(_EGL_WARNING, "unknown client API 0x%04x", ctx->ClientAPI);
@@ -299,10 +92,10 @@ egl_g3d_init_st(_EGLDriver *drv)
    if (gdrv->api_mask)
       return;
 
-   for (i = 0; i < NUM_EGL_G3D_STS; i++) {
-      gdrv->stapis[i] = egl_g3d_get_st(i);
+   for (i = 0; i < ST_API_COUNT; i++) {
+      gdrv->stapis[i] = egl_g3d_create_st_api(i);
       if (gdrv->stapis[i])
-         gdrv->api_mask |= gdrv->stapis[i]->api_bit;
+         gdrv->api_mask |= egl_g3d_st_api_bit(i);
    }
 
    if (gdrv->api_mask)
@@ -351,35 +144,6 @@ egl_g3d_destroy_probe(_EGLDriver *drv, _EGLDisplay *dpy)
    }
 }
 
-/**
- * Return an API mask that consists of the state trackers that supports the
- * given mode.
- *
- * FIXME add st_is_mode_supported()?
- */
-static EGLint
-get_mode_api_mask(const __GLcontextModes *mode, EGLint api_mask)
-{
-   EGLint check;
-
-   /* OpenGL ES 1.x and 2.x are checked together */
-   check = EGL_OPENGL_ES_BIT | EGL_OPENGL_ES2_BIT;
-   if (api_mask & check) {
-      /* this is required by EGL, not by OpenGL ES */
-      if (mode->drawableType & GLX_WINDOW_BIT && !mode->doubleBufferMode)
-         api_mask &= ~check;
-   }
-
-   check = EGL_OPENVG_BIT;
-   if (api_mask & check) {
-      /* vega st needs the depth/stencil rb */
-      if (!mode->depthBits && !mode->stencilBits)
-         api_mask &= ~check;
-   }
-
-   return api_mask;
-}
-
 #ifdef EGL_MESA_screen_surface
 
 static void
@@ -444,18 +208,88 @@ egl_g3d_add_screens(_EGLDriver *drv, _EGLDisplay *dpy)
 #endif /* EGL_MESA_screen_surface */
 
 /**
+ * Initialize an EGL config from the native config.
+ */
+static EGLBoolean
+egl_g3d_init_config(_EGLDriver *drv, _EGLDisplay *dpy,
+                    _EGLConfig *conf, const struct native_config *nconf)
+{
+   struct egl_g3d_driver *gdrv = egl_g3d_driver(drv);
+   struct egl_g3d_config *gconf = egl_g3d_config(conf);
+   const __GLcontextModes *mode = &nconf->mode;
+   EGLint buffer_mask, api_mask;
+   EGLBoolean valid;
+   EGLint i;
+
+   buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
+   if (mode->doubleBufferMode)
+      buffer_mask |= ST_ATTACHMENT_BACK_LEFT_MASK;
+   if (mode->stereoMode) {
+      buffer_mask |= ST_ATTACHMENT_FRONT_RIGHT_MASK;
+      if (mode->doubleBufferMode)
+         buffer_mask |= ST_ATTACHMENT_BACK_RIGHT_MASK;
+   }
+
+   gconf->stvis.buffer_mask = buffer_mask;
+   gconf->stvis.color_format = nconf->color_format;
+   gconf->stvis.depth_stencil_format = nconf->depth_format;
+   gconf->stvis.accum_format = PIPE_FORMAT_NONE;
+   gconf->stvis.samples = 0;
+
+   gconf->stvis.render_buffer = (buffer_mask & ST_ATTACHMENT_BACK_LEFT) ?
+      ST_ATTACHMENT_BACK_LEFT : ST_ATTACHMENT_FRONT_LEFT;
+
+   api_mask = 0;
+   for (i = 0; i < ST_API_COUNT; i++) {
+      struct st_api *stapi = gdrv->stapis[i];
+      if (stapi) {
+         if (stapi->is_visual_supported(stapi, &gconf->stvis))
+            api_mask |= egl_g3d_st_api_bit(i);
+      }
+   }
+   /* this is required by EGL, not by OpenGL ES */
+   if ((mode->drawableType & GLX_WINDOW_BIT) && !mode->doubleBufferMode)
+      api_mask &= ~(EGL_OPENGL_ES_BIT | EGL_OPENGL_ES2_BIT);
+
+   if (!api_mask) {
+      _eglLog(_EGL_DEBUG, "no state tracker supports config 0x%x",
+            mode->visualID);
+   }
+
+   valid = _eglConfigFromContextModesRec(&gconf->base,
+         mode, api_mask, api_mask);
+   if (valid) {
+#ifdef EGL_MESA_screen_surface
+      /* check if scanout surface bit is set */
+      if (nconf->scanout_bit) {
+         EGLint val = GET_CONFIG_ATTRIB(&gconf->base, EGL_SURFACE_TYPE);
+         val |= EGL_SCREEN_BIT_MESA;
+         SET_CONFIG_ATTRIB(&gconf->base, EGL_SURFACE_TYPE, val);
+      }
+#endif
+      valid = _eglValidateConfig(&gconf->base, EGL_FALSE);
+   }
+   if (!valid) {
+      _eglLog(_EGL_DEBUG, "skip invalid config 0x%x", mode->visualID);
+      return EGL_FALSE;
+   }
+
+   gconf->native = nconf;
+
+   return EGL_TRUE;
+}
+
+/**
  * Add configs to display and return the next config ID.
  */
 static EGLint
 egl_g3d_add_configs(_EGLDriver *drv, _EGLDisplay *dpy, EGLint id)
 {
-   struct egl_g3d_driver *gdrv = egl_g3d_driver(drv);
    struct egl_g3d_display *gdpy = egl_g3d_display(dpy);
    const struct native_config **native_configs;
    int num_configs, i;
 
-   native_configs = gdpy->native->get_configs(gdpy->native,
-         &num_configs);
+   native_configs = gdpy->native->get_configs(gdpy->native, &num_configs);
    if (!num_configs) {
       if (native_configs)
          free(native_configs);
@@ -463,61 +297,25 @@ egl_g3d_add_configs(_EGLDriver *drv, _EGLDisplay *dpy, EGLint id)
    }
 
    for (i = 0; i < num_configs; i++) {
-      EGLint api_mask;
       struct egl_g3d_config *gconf;
-      EGLBoolean valid;
 
       gconf = CALLOC_STRUCT(egl_g3d_config);
-      if (!gconf)
-         continue;
-
-      _eglInitConfig(&gconf->base, dpy, id);
-
-      api_mask = get_mode_api_mask(&native_configs[i]->mode, gdrv->api_mask);
-      if (!api_mask) {
-         _eglLog(_EGL_DEBUG, "no state tracker supports config 0x%x",
-               native_configs[i]->mode.visualID);
-      }
-
-      valid = _eglConfigFromContextModesRec(&gconf->base,
-            &native_configs[i]->mode, api_mask, api_mask);
-      if (valid) {
-#ifdef EGL_MESA_screen_surface
-         /* check if scanout surface bit is set */
-         if (native_configs[i]->scanout_bit) {
-            EGLint val = GET_CONFIG_ATTRIB(&gconf->base, EGL_SURFACE_TYPE);
-            val |= EGL_SCREEN_BIT_MESA;
-            SET_CONFIG_ATTRIB(&gconf->base, EGL_SURFACE_TYPE, val);
+      if (gconf) {
+         _eglInitConfig(&gconf->base, dpy, id);
+         if (!egl_g3d_init_config(drv, dpy, &gconf->base, native_configs[i])) {
+            free(gconf);
+            continue;
          }
-#endif
-         valid = _eglValidateConfig(&gconf->base, EGL_FALSE);
-      }
-      if (!valid) {
-         _eglLog(_EGL_DEBUG, "skip invalid config 0x%x",
-               native_configs[i]->mode.visualID);
-         free(gconf);
-         continue;
-      }
 
-      gconf->native = native_configs[i];
-      _eglAddConfig(dpy, &gconf->base);
-      id++;
+         _eglAddConfig(dpy, &gconf->base);
+         id++;
+      }
    }
 
    free(native_configs);
    return id;
 }
 
-/**
- * Re-validate the context.
- */
-static void
-egl_g3d_update_buffer(struct pipe_screen *screen, void *context_private)
-{
-   struct egl_g3d_context *gctx = egl_g3d_context(context_private);
-   egl_g3d_validate_context(gctx->base.Resource.Display, &gctx->base);
-}
-
 static void
 egl_g3d_invalid_surface(struct native_display *ndpy,
                         struct native_surface *nsurf,
@@ -525,11 +323,15 @@ egl_g3d_invalid_surface(struct native_display *ndpy,
 {
    /* XXX not thread safe? */
    struct egl_g3d_surface *gsurf = egl_g3d_surface(nsurf->user_data);
-   struct egl_g3d_context *gctx = egl_g3d_context(gsurf->base.CurrentContext);
-
-   /* set force_validate to skip an unnecessary check */
+   struct egl_g3d_context *gctx;
+   
+   /*
+    * Some functions such as egl_g3d_copy_buffers create a temporary native
+    * surface.  There is no gsurf associated with it.
+    */
+   gctx = (gsurf) ? egl_g3d_context(gsurf->base.CurrentContext) : NULL;
    if (gctx)
-      gctx->force_validate = TRUE;
+      gctx->stctxi->notify_invalid_framebuffer(gctx->stctxi, gsurf->stfbi);
 }
 
 static struct native_event_handler egl_g3d_native_event_handler = {
@@ -545,6 +347,9 @@ egl_g3d_terminate(_EGLDriver *drv, _EGLDisplay *dpy)
    _eglReleaseDisplayResources(drv, dpy);
    _eglCleanupDisplay(dpy);
 
+   if (gdpy->pipe)
+      gdpy->pipe->destroy(gdpy->pipe);
+
    if (dpy->Screens) {
       for (i = 0; i < dpy->NumScreens; i++) {
          struct egl_g3d_screen *gscr = egl_g3d_screen(dpy->Screens[i]);
@@ -554,6 +359,9 @@ egl_g3d_terminate(_EGLDriver *drv, _EGLDisplay *dpy)
       free(dpy->Screens);
    }
 
+   if (gdpy->smapi)
+      egl_g3d_destroy_st_manager(gdpy->smapi);
+
    if (gdpy->native)
       gdpy->native->destroy(gdpy->native);
 
@@ -588,11 +396,17 @@ egl_g3d_initialize(_EGLDriver *drv, _EGLDisplay *dpy,
    }
 
    gdpy->native->user_data = (void *) dpy;
-   gdpy->native->screen->update_buffer = egl_g3d_update_buffer;
 
    egl_g3d_init_st(&gdrv->base);
    dpy->ClientAPIsMask = gdrv->api_mask;
 
+   gdpy->smapi = egl_g3d_create_st_manager(dpy);
+   if (!gdpy->smapi) {
+      _eglError(EGL_NOT_INITIALIZED,
+            "eglInitialize(failed to create st manager)");
+      goto fail;
+   }
+
 #ifdef EGL_MESA_screen_surface
    /* enable MESA_screen_surface before adding (and validating) configs */
    if (gdpy->native->modeset) {
@@ -629,7 +443,6 @@ egl_g3d_create_context(_EGLDriver *drv, _EGLDisplay *dpy, _EGLConfig *conf,
    struct egl_g3d_context *gshare = egl_g3d_context(share);
    struct egl_g3d_config *gconf = egl_g3d_config(conf);
    struct egl_g3d_context *gctx;
-   const __GLcontextModes *mode;
 
    gctx = CALLOC_STRUCT(egl_g3d_context);
    if (!gctx) {
@@ -648,24 +461,14 @@ egl_g3d_create_context(_EGLDriver *drv, _EGLDisplay *dpy, _EGLConfig *conf,
       return NULL;
    }
 
-   mode = &gconf->native->mode;
-
-   gctx->pipe = gdpy->native->screen->context_create(
-      gdpy->native->screen,
-      (void *) &gctx->base);
-
-   if (!gctx->pipe) {
+   gctx->stctxi = gctx->stapi->create_context(gctx->stapi, gdpy->smapi,
+         &gconf->stvis, (gshare) ? gshare->stctxi : NULL);
+   if (!gctx->stctxi) {
       free(gctx);
       return NULL;
    }
 
-   gctx->st_ctx = gctx->stapi->st_create_context(gctx->pipe, mode,
-                        (gshare) ? gshare->st_ctx : NULL);
-   if (!gctx->st_ctx) {
-      gctx->pipe->destroy(gctx->pipe);
-      free(gctx);
-      return NULL;
-   }
+   gctx->stctxi->st_manager_private = (void *) &gctx->base;
 
    return &gctx->base;
 }
@@ -682,9 +485,7 @@ destroy_context(_EGLDisplay *dpy, _EGLContext *ctx)
    if (!dpy->Initialized)
       _eglLog(_EGL_FATAL, "destroy a context with an unitialized display");
 
-   egl_g3d_realloc_context(dpy, &gctx->base);
-   /* it will destroy the associated pipe context */
-   gctx->stapi->st_destroy_context(gctx->st_ctx);
+   gctx->stctxi->destroy(gctx->stctxi);
 
    free(gctx);
 }
@@ -786,14 +587,20 @@ egl_g3d_create_surface(_EGLDriver *drv, _EGLDisplay *dpy, _EGLConfig *conf,
       return NULL;
    }
 
+   gsurf->stvis = gconf->stvis;
+   if (gsurf->base.RenderBuffer == EGL_SINGLE_BUFFER)
+      gsurf->stvis.render_buffer = ST_ATTACHMENT_FRONT_LEFT;
+
+   gsurf->stfbi = egl_g3d_create_st_framebuffer(&gsurf->base);
+   if (!gsurf->stfbi) {
+      gsurf->native->destroy(gsurf->native);
+      free(gsurf);
+      return NULL;
+   }
+
    nsurf->user_data = &gsurf->base;
    gsurf->native = nsurf;
 
-   gsurf->render_att = (gsurf->base.RenderBuffer == EGL_SINGLE_BUFFER) ?
-      NATIVE_ATTACHMENT_FRONT_LEFT : NATIVE_ATTACHMENT_BACK_LEFT;
-   if (!gconf->native->mode.doubleBufferMode)
-      gsurf->render_att = NATIVE_ATTACHMENT_FRONT_LEFT;
-
    return &gsurf->base;
 }
 
@@ -849,7 +656,8 @@ destroy_surface(_EGLDisplay *dpy, _EGLSurface *surf)
    if (!dpy->Initialized)
       _eglLog(_EGL_FATAL, "destroy a surface with an unitialized display");
 
-   pipe_surface_reference(&gsurf->render_surface, NULL);
+   pipe_texture_reference(&gsurf->render_texture, NULL);
+   egl_g3d_destroy_st_framebuffer(gsurf->stfbi);
    gsurf->native->destroy(gsurf->native);
    free(gsurf);
 }
@@ -868,6 +676,7 @@ egl_g3d_make_current(_EGLDriver *drv, _EGLDisplay *dpy,
 {
    struct egl_g3d_context *gctx = egl_g3d_context(ctx);
    struct egl_g3d_surface *gdraw = egl_g3d_surface(draw);
+   struct egl_g3d_surface *gread = egl_g3d_surface(read);
    struct egl_g3d_context *old_gctx;
    EGLBoolean ok = EGL_TRUE;
 
@@ -878,39 +687,29 @@ egl_g3d_make_current(_EGLDriver *drv, _EGLDisplay *dpy,
 
    if (old_gctx) {
       /* flush old context */
-      old_gctx->stapi->st_flush(old_gctx->st_ctx,
+      old_gctx->stctxi->flush(old_gctx->stctxi,
             PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, NULL);
-
-      /*
-       * The old context is no longer current, and egl_g3d_realloc_context()
-       * should be called to destroy the framebuffers.  However, it is possible
-       * that it will be made current again with the same draw/read surfaces.
-       * It might be better to keep it around.
-       */
    }
 
    if (gctx) {
-      ok = egl_g3d_realloc_context(dpy, &gctx->base);
+      ok = gctx->stapi->make_current(gctx->stapi, gctx->stctxi,
+            (gdraw) ? gdraw->stfbi : NULL, (gread) ? gread->stfbi : NULL);
       if (ok) {
-         /* XXX: need to pass the winsys argument for
-          * flush_frontbuffer in the fourth parameter here:
-          */
-         ok = gctx->stapi->st_make_current(gctx->st_ctx,
-                                           gctx->draw.st_fb,
-                                           gctx->read.st_fb,
-                                           NULL);
-         if (ok) {
-            egl_g3d_validate_context(dpy, &gctx->base);
-            if (gdraw->base.Type == EGL_WINDOW_BIT) {
-               gctx->base.WindowRenderBuffer =
-                  (gdraw->render_att == NATIVE_ATTACHMENT_FRONT_LEFT) ?
-                  EGL_SINGLE_BUFFER : EGL_BACK_BUFFER;
-            }
+         gctx->stctxi->notify_invalid_framebuffer(gctx->stctxi, gdraw->stfbi);
+         if (gread != gdraw) {
+            gctx->stctxi->notify_invalid_framebuffer(gctx->stctxi,
+                  gread->stfbi);
+         }
+
+         if (gdraw->base.Type == EGL_WINDOW_BIT) {
+            gctx->base.WindowRenderBuffer =
+               (gdraw->stvis.render_buffer == ST_ATTACHMENT_FRONT_LEFT) ?
+               EGL_SINGLE_BUFFER : EGL_BACK_BUFFER;
          }
       }
    }
    else if (old_gctx) {
-      ok = old_gctx->stapi->st_make_current(NULL, NULL, NULL, NULL);
+      ok = old_gctx->stapi->make_current(old_gctx->stapi, NULL, NULL, NULL);
       old_gctx->base.WindowRenderBuffer = EGL_NONE;
    }
 
@@ -937,15 +736,17 @@ egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
       return EGL_TRUE;
 
    /* or when the surface is single-buffered */
-   if (gsurf->render_att == NATIVE_ATTACHMENT_FRONT_LEFT)
+   if (gsurf->stvis.render_buffer == ST_ATTACHMENT_FRONT_LEFT)
       return EGL_TRUE;
 
    if (ctx && ctx->DrawSurface == surf)
       gctx = egl_g3d_context(ctx);
 
    /* flush if the surface is current */
-   if (gctx)
-      gctx->stapi->st_notify_swapbuffers(gctx->draw.st_fb);
+   if (gctx) {
+      gctx->stctxi->flush(gctx->stctxi,
+            PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, NULL);
+   }
 
    return gsurf->native->swap_buffers(gsurf->native);
 }
@@ -985,7 +786,7 @@ get_pipe_surface(struct native_display *ndpy, struct native_surface *nsurf,
       return NULL;
 
    psurf = ndpy->screen->get_tex_surface(ndpy->screen, textures[natt],
-         0, 0, 0, PIPE_BUFFER_USAGE_CPU_WRITE);
+         0, 0, 0, PIPE_BUFFER_USAGE_GPU_WRITE);
    pipe_texture_reference(&textures[natt], NULL);
 
    return psurf;
@@ -1003,7 +804,7 @@ egl_g3d_copy_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
    struct pipe_screen *screen = gdpy->native->screen;
    struct pipe_surface *psurf;
 
-   if (!gsurf->render_surface)
+   if (!gsurf->render_texture)
       return EGL_TRUE;
 
    gconf = egl_g3d_config(egl_g3d_find_pixmap_config(dpy, target));
@@ -1018,26 +819,33 @@ egl_g3d_copy_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
    /* flush if the surface is current */
    if (ctx && ctx->DrawSurface == &gsurf->base) {
       struct egl_g3d_context *gctx = egl_g3d_context(ctx);
-      gctx->stapi->st_flush(gctx->st_ctx,
+      gctx->stctxi->flush(gctx->stctxi,
             PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, NULL);
    }
 
+   /* create a pipe context to copy surfaces */
+   if (!gdpy->pipe) {
+      gdpy->pipe =
+         gdpy->native->screen->context_create(gdpy->native->screen, NULL);
+      if (!gdpy->pipe)
+         return EGL_FALSE;
+   }
+
    psurf = get_pipe_surface(gdpy->native, nsurf, NATIVE_ATTACHMENT_FRONT_LEFT);
    if (psurf) {
-      struct pipe_context pipe;
+      struct pipe_surface *psrc;
 
-      /**
-       * XXX This is hacky.  If we might allow the EGLDisplay to create a pipe
-       * context of its own and use the blitter context for this.
-       */
-      memset(&pipe, 0, sizeof(pipe));
-      pipe.screen = screen;
+      psrc = screen->get_tex_surface(screen, gsurf->render_texture,
+            0, 0, 0, PIPE_BUFFER_USAGE_GPU_READ);
+      if (psrc) {
+         gdpy->pipe->surface_copy(gdpy->pipe, psurf, 0, 0,
+               psrc, 0, 0, psurf->width, psurf->height);
+         pipe_surface_reference(&psrc, NULL);
 
-      util_surface_copy(&pipe, FALSE, psurf, 0, 0,
-            gsurf->render_surface, 0, 0, psurf->width, psurf->height);
+         nsurf->flush_frontbuffer(nsurf);
+      }
 
       pipe_surface_reference(&psurf, NULL);
-      nsurf->flush_frontbuffer(nsurf);
    }
 
    nsurf->destroy(nsurf);
@@ -1048,8 +856,16 @@ egl_g3d_copy_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
 static EGLBoolean
 egl_g3d_wait_client(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx)
 {
+   struct egl_g3d_display *gdpy = egl_g3d_display(dpy);
    struct egl_g3d_context *gctx = egl_g3d_context(ctx);
-   gctx->stapi->st_finish(gctx->st_ctx);
+   struct pipe_screen *screen = gdpy->native->screen;
+   struct pipe_fence_handle *fence = NULL;
+
+   gctx->stctxi->flush(gctx->stctxi,
+         PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, &fence);
+   screen->fence_finish(screen, fence, 0);
+   screen->fence_reference(screen, &fence, NULL);
+
    return EGL_TRUE;
 }
 
@@ -1079,10 +895,10 @@ egl_g3d_get_proc_address(_EGLDriver *drv, const char *procname)
    /* in case this is called before a display is initialized */
    egl_g3d_init_st(&gdrv->base);
 
-   for (i = 0; i < NUM_EGL_G3D_STS; i++) {
-      const struct egl_g3d_st *stapi = gdrv->stapis[i];
+   for (i = 0; i < ST_API_COUNT; i++) {
+      struct st_api *stapi = gdrv->stapis[i];
       if (stapi) {
-         proc = (_EGLProc) stapi->st_get_proc_address(procname);
+         proc = (_EGLProc) stapi->get_proc_address(stapi, procname);
          if (proc)
             return proc;
       }
@@ -1098,8 +914,8 @@ egl_g3d_bind_tex_image(_EGLDriver *drv, _EGLDisplay *dpy,
    struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
    _EGLContext *es1 = _eglGetAPIContext(EGL_OPENGL_ES_API);
    struct egl_g3d_context *gctx;
-   enum pipe_format target_format;
-   int target;
+   enum pipe_format internal_format;
+   enum st_texture_type target;
 
    if (!gsurf || gsurf->base.Type != EGL_PBUFFER_BIT)
       return _eglError(EGL_BAD_SURFACE, "eglBindTexImage");
@@ -1110,10 +926,10 @@ egl_g3d_bind_tex_image(_EGLDriver *drv, _EGLDisplay *dpy,
 
    switch (gsurf->base.TextureFormat) {
    case EGL_TEXTURE_RGB:
-      target_format = PIPE_FORMAT_R8G8B8_UNORM;
+      internal_format = PIPE_FORMAT_R8G8B8_UNORM;
       break;
    case EGL_TEXTURE_RGBA:
-      target_format = PIPE_FORMAT_B8G8R8A8_UNORM;
+      internal_format = PIPE_FORMAT_B8G8R8A8_UNORM;
       break;
    default:
       return _eglError(EGL_BAD_MATCH, "eglBindTexImage");
@@ -1129,21 +945,24 @@ egl_g3d_bind_tex_image(_EGLDriver *drv, _EGLDisplay *dpy,
 
    if (!es1)
       return EGL_TRUE;
-   if (!gsurf->render_surface)
+   if (!gsurf->render_texture)
       return EGL_FALSE;
 
    /* flush properly if the surface is bound */
    if (gsurf->base.CurrentContext) {
       gctx = egl_g3d_context(gsurf->base.CurrentContext);
-      gctx->stapi->st_flush(gctx->st_ctx,
+      gctx->stctxi->flush(gctx->stctxi,
             PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, NULL);
    }
 
    gctx = egl_g3d_context(es1);
-   gctx->stapi->st_bind_texture_surface(gsurf->render_surface,
-         target, gsurf->base.MipmapLevel, target_format);
-
-   gsurf->base.BoundToTexture = EGL_TRUE;
+   if (gctx->stctxi->teximage) {
+      if (!gctx->stctxi->teximage(gctx->stctxi, target,
+               gsurf->base.MipmapLevel, internal_format,
+               gsurf->render_texture, gsurf->base.MipmapTexture))
+         return EGL_FALSE;
+      gsurf->base.BoundToTexture = EGL_TRUE;
+   }
 
    return EGL_TRUE;
 }
@@ -1160,14 +979,15 @@ egl_g3d_release_tex_image(_EGLDriver *drv, _EGLDisplay *dpy,
    if (buffer != EGL_BACK_BUFFER)
       return _eglError(EGL_BAD_PARAMETER, "eglReleaseTexImage");
 
-   if (gsurf->render_surface) {
+   if (gsurf->render_texture) {
       _EGLContext *ctx = _eglGetAPIContext(EGL_OPENGL_ES_API);
       struct egl_g3d_context *gctx = egl_g3d_context(ctx);
 
       /* what if the context the surface binds to is no longer current? */
-      if (gctx)
-         gctx->stapi->st_unbind_texture_surface(gsurf->render_surface,
-               ST_TEXTURE_2D, gsurf->base.MipmapLevel);
+      if (gctx) {
+         gctx->stctxi->teximage(gctx->stctxi, ST_TEXTURE_2D,
+               gsurf->base.MipmapLevel, PIPE_FORMAT_NONE, NULL, FALSE);
+      }
    }
 
    gsurf->base.BoundToTexture = EGL_FALSE;
@@ -1279,6 +1099,12 @@ static void
 egl_g3d_unload(_EGLDriver *drv)
 {
    struct egl_g3d_driver *gdrv = egl_g3d_driver(drv);
+   EGLint i;
+
+   for (i = 0; i < ST_API_COUNT; i++) {
+      if (gdrv->stapis[i])
+         gdrv->stapis[i]->destroy(gdrv->stapis[i]);
+   }
 
    egl_g3d_destroy_probe(drv, NULL);
    free(gdrv);
diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.h b/src/gallium/state_trackers/egl/common/egl_g3d.h
index e3e55e46d3..2788f1bf4a 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d.h
+++ b/src/gallium/state_trackers/egl/common/egl_g3d.h
@@ -39,11 +39,11 @@
 #include "eglmode.h"
 
 #include "native.h"
-#include "egl_st.h"
+#include "egl_g3d_st.h"
 
 struct egl_g3d_driver {
    _EGLDriver base;
-   const struct egl_g3d_st *stapis[NUM_EGL_G3D_STS];
+   struct st_api *stapis[ST_API_COUNT];
    EGLint api_mask;
 
    EGLint probe_key;
@@ -51,35 +51,34 @@ struct egl_g3d_driver {
 
 struct egl_g3d_display {
    struct native_display *native;
-};
 
-struct egl_g3d_buffer {
-   struct st_framebuffer *st_fb;
-   uint attachment_mask;
+   struct st_manager *smapi;
+   struct pipe_context *pipe;
 };
 
 struct egl_g3d_context {
    _EGLContext base;
 
-   const struct egl_g3d_st *stapi;
-   struct pipe_context *pipe;
+   struct st_api *stapi;
 
-   struct st_context *st_ctx;
-   EGLBoolean force_validate;
-   struct egl_g3d_buffer draw, read;
+   struct st_context_iface *stctxi;
 };
 
 struct egl_g3d_surface {
    _EGLSurface base;
+
+   struct st_visual stvis;
+   struct st_framebuffer_iface *stfbi;
+
    struct native_surface *native;
-   enum native_attachment render_att;
-   struct pipe_surface *render_surface;
+   struct pipe_texture *render_texture;
    unsigned int sequence_number;
 };
 
 struct egl_g3d_config {
    _EGLConfig base;
    const struct native_config *native;
+   struct st_visual stvis;
 };
 
 struct egl_g3d_image {
diff --git a/src/gallium/state_trackers/egl/common/egl_g3d_st.c b/src/gallium/state_trackers/egl/common/egl_g3d_st.c
new file mode 100644
index 0000000000..36094096d3
--- /dev/null
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_st.c
@@ -0,0 +1,227 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+#include "util/u_dl.h"
+#include "eglimage.h"
+#include "eglmutex.h"
+
+#include "egl_g3d.h"
+#include "egl_g3d_st.h"
+
+struct egl_g3d_st_manager {
+   struct st_manager base;
+   _EGLDisplay *display;
+};
+
+static INLINE struct egl_g3d_st_manager *
+egl_g3d_st_manager(struct st_manager *smapi)
+{
+   return (struct egl_g3d_st_manager *) smapi;
+}
+
+struct st_api *
+egl_g3d_create_st_api(enum st_api_type api)
+{
+   const char *stmod_name;
+   struct util_dl_library *lib;
+   const struct st_module *mod;
+
+   switch (api) {
+   case ST_API_OPENGL:
+      stmod_name = ST_MODULE_OPENGL_SYMBOL;
+      break;
+   case ST_API_OPENGL_ES1:
+      stmod_name = ST_MODULE_OPENGL_ES1_SYMBOL;
+      break;
+   case ST_API_OPENGL_ES2:
+      stmod_name = ST_MODULE_OPENGL_ES2_SYMBOL;
+      break;
+   case ST_API_OPENVG:
+      stmod_name = ST_MODULE_OPENVG_SYMBOL;
+      break;
+   default:
+      stmod_name = NULL;
+      break;
+   }
+   if (!stmod_name)
+      return NULL;
+
+   mod = NULL;
+   lib = util_dl_open(NULL);
+   if (lib) {
+      mod = (const struct st_module *)
+         util_dl_get_proc_address(lib, stmod_name);
+      util_dl_close(lib);
+   }
+   if (!mod || mod->api != api)
+      return NULL;
+
+   return mod->create_api();
+}
+
+struct st_manager *
+egl_g3d_create_st_manager(_EGLDisplay *dpy)
+{
+   struct egl_g3d_display *gdpy = egl_g3d_display(dpy);
+   struct egl_g3d_st_manager *gsmapi;
+
+   gsmapi = CALLOC_STRUCT(egl_g3d_st_manager);
+   if (gsmapi) {
+      gsmapi->display = dpy;
+
+      gsmapi->base.screen = gdpy->native->screen;
+   }
+
+   return &gsmapi->base;;
+}
+
+void
+egl_g3d_destroy_st_manager(struct st_manager *smapi)
+{
+   struct egl_g3d_st_manager *gsmapi = egl_g3d_st_manager(smapi);
+   free(gsmapi);
+}
+
+static boolean
+egl_g3d_st_framebuffer_flush_front(struct st_framebuffer_iface *stfbi,
+                                   enum st_attachment_type statt)
+{
+   _EGLSurface *surf = (_EGLSurface *) stfbi->st_manager_private;
+   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
+
+   return gsurf->native->flush_frontbuffer(gsurf->native);
+}
+
+static boolean 
+egl_g3d_st_framebuffer_validate(struct st_framebuffer_iface *stfbi,
+                                const enum st_attachment_type *statts,
+                                unsigned count,
+                                struct pipe_texture **out)
+{
+   _EGLSurface *surf = (_EGLSurface *) stfbi->st_manager_private;
+   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
+   struct pipe_texture *textures[NUM_NATIVE_ATTACHMENTS];
+   uint attachment_mask = 0;
+   unsigned i;
+
+   for (i = 0; i < count; i++) {
+      int natt;
+
+      switch (statts[i]) {
+      case ST_ATTACHMENT_FRONT_LEFT:
+         natt = NATIVE_ATTACHMENT_FRONT_LEFT;
+         break;
+      case ST_ATTACHMENT_BACK_LEFT:
+         natt = NATIVE_ATTACHMENT_BACK_LEFT;
+         break;
+      case ST_ATTACHMENT_FRONT_RIGHT:
+         natt = NATIVE_ATTACHMENT_FRONT_RIGHT;
+         break;
+      case ST_ATTACHMENT_BACK_RIGHT:
+         natt = NATIVE_ATTACHMENT_BACK_RIGHT;
+      default:
+         natt = -1;
+         break;
+      }
+
+      if (natt >= 0)
+         attachment_mask |= 1 << natt;
+   }
+
+   if (!gsurf->native->validate(gsurf->native, attachment_mask,
+         &gsurf->sequence_number, textures, &gsurf->base.Width,
+         &gsurf->base.Height))
+      return FALSE;
+
+   for (i = 0; i < count; i++) {
+      struct pipe_texture *tex;
+      int natt;
+
+      switch (statts[i]) {
+      case ST_ATTACHMENT_FRONT_LEFT:
+         natt = NATIVE_ATTACHMENT_FRONT_LEFT;
+         break;
+      case ST_ATTACHMENT_BACK_LEFT:
+         natt = NATIVE_ATTACHMENT_BACK_LEFT;
+         break;
+      case ST_ATTACHMENT_FRONT_RIGHT:
+         natt = NATIVE_ATTACHMENT_FRONT_RIGHT;
+         break;
+      case ST_ATTACHMENT_BACK_RIGHT:
+         natt = NATIVE_ATTACHMENT_BACK_RIGHT;
+         break;
+      default:
+         natt = -1;
+         break;
+      }
+
+      if (natt >= 0) {
+         tex = textures[natt];
+
+         if (statts[i] == stfbi->visual->render_buffer)
+            pipe_texture_reference(&gsurf->render_texture, tex);
+
+         if (attachment_mask & (1 << natt)) {
+            /* transfer the ownership to the caller */
+            out[i] = tex;
+            attachment_mask &= ~(1 << natt);
+         }
+         else {
+            /* the attachment is listed more than once */
+            pipe_texture_reference(&out[i], tex);
+         }
+      }
+   }
+
+   return TRUE;
+}
+
+struct st_framebuffer_iface *
+egl_g3d_create_st_framebuffer(_EGLSurface *surf)
+{
+   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
+   struct st_framebuffer_iface *stfbi;
+
+   stfbi = CALLOC_STRUCT(st_framebuffer_iface);
+   if (!stfbi)
+      return NULL;
+
+   stfbi->visual = &gsurf->stvis;
+   stfbi->flush_front = egl_g3d_st_framebuffer_flush_front;
+   stfbi->validate = egl_g3d_st_framebuffer_validate;
+   stfbi->st_manager_private = (void *) &gsurf->base;
+
+   return stfbi;
+}
+
+void
+egl_g3d_destroy_st_framebuffer(struct st_framebuffer_iface *stfbi)
+{
+   free(stfbi);
+}
diff --git a/src/gallium/state_trackers/egl/common/egl_st.h b/src/gallium/state_trackers/egl/common/egl_g3d_st.h
index 8fb464bd3d..ea8b4068cd 100644
--- a/src/gallium/state_trackers/egl/common/egl_st.h
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_st.h
@@ -1,8 +1,8 @@
 /*
  * Mesa 3-D graphics library
- * Version:  7.8
+ * Version:  7.9
  *
- * Copyright (C) 2009-2010 Chia-I Wu <olv@0xlab.org>
+ * Copyright (C) 2010 LunarG Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -20,54 +20,60 @@
  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
  */
 
-#ifndef _EGL_ST_H_
-#define _EGL_ST_H_
-
-#include "GL/gl.h" /* for GL types */
-#include "GL/internal/glcore.h"  /* for __GLcontextModes */
+#ifndef _EGL_G3D_ST_H_
+#define _EGL_G3D_ST_H_
 
 #include "pipe/p_compiler.h"
-#include "pipe/p_format.h"
-#include "pipe/p_context.h"
+#include "state_tracker/st_api.h"
+#include "egltypedefs.h"
 
-/* avoid calling st functions directly */
-#if 1
+struct st_api *
+egl_g3d_create_st_api(enum st_api_type api);
 
-#define ST_SURFACE_FRONT_LEFT   0
-#define ST_SURFACE_BACK_LEFT    1
-#define ST_SURFACE_FRONT_RIGHT  2
-#define ST_SURFACE_BACK_RIGHT   3
+struct st_manager *
+egl_g3d_create_st_manager(_EGLDisplay *dpy);
 
-#define ST_TEXTURE_2D    0x2
+void
+egl_g3d_destroy_st_manager(struct st_manager *smapi);
 
-struct st_context;
-struct st_framebuffer;
-typedef void (*st_proc)();
+struct st_framebuffer_iface *
+egl_g3d_create_st_framebuffer(_EGLSurface *surf);
 
-#else
-#include "state_tracker/st_public.h"
-#endif
+void
+egl_g3d_destroy_st_framebuffer(struct st_framebuffer_iface *stfbi);
 
-/* remember to update egl_g3d_get_st() when update the enums */
-enum egl_g3d_st_api {
-   EGL_G3D_ST_OPENGL_ES = 0,
-   EGL_G3D_ST_OPENVG,
-   EGL_G3D_ST_OPENGL_ES2,
-   EGL_G3D_ST_OPENGL,
-
-   NUM_EGL_G3D_STS
-};
+/**
+ * Return the EGL_<api>_BIT of the st api.
+ */
+static INLINE int
+egl_g3d_st_api_bit(enum st_api_type api)
+{
+   int bit;
 
-struct egl_g3d_st {
-#define ST_PUBLIC(name, ret, ...) ret (*name)(__VA_ARGS__);
-#include "st_public_tmp.h"
-   /* fields must be added here */
-   EGLint api_bit;
-};
+   switch (api) {
+   case ST_API_OPENGL:
+      bit = EGL_OPENGL_BIT;
+      break;
+   case ST_API_OPENGL_ES1:
+      bit = EGL_OPENGL_ES_BIT;
+      break;
+   case ST_API_OPENGL_ES2:
+      bit = EGL_OPENGL_ES2_BIT;
+      break;
+   case ST_API_OPENVG:
+      bit = EGL_OPENVG_BIT;
+      break;
+   default:
+      bit = 0;
+      break;
+   }
 
-const struct egl_g3d_st *
-egl_g3d_get_st(enum egl_g3d_st_api api);
+   return bit;
+}
 
-#endif /* _EGL_ST_H_ */
+#endif /* _EGL_G3D_ST_H_ */
diff --git a/src/gallium/state_trackers/egl/common/egl_st.c b/src/gallium/state_trackers/egl/common/egl_st.c
deleted file mode 100644
index a88ff911cd..0000000000
--- a/src/gallium/state_trackers/egl/common/egl_st.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.8
- *
- * Copyright (C) 2009-2010 Chia-I Wu <olv@0xlab.org>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-#include <dlfcn.h>
-#include "pipe/p_compiler.h"
-#include "util/u_memory.h"
-#include "egllog.h"
-#include "EGL/egl.h" /* for EGL_api_BIT */
-
-#include "egl_st.h"
-
-#ifndef HAVE_DLADDR
-#define HAVE_DLADDR 1
-#endif
-
-#if HAVE_DLADDR
-
-static const char *
-egl_g3d_st_names[] = {
-#define ST_PUBLIC(name, ...) #name,
-#include "st_public_tmp.h"
-   NULL
-};
-
-static boolean
-egl_g3d_fill_st(struct egl_g3d_st *stapi, void *sym)
-{
-   st_proc *procs = (st_proc *) stapi;
-   void *handle;
-   Dl_info info;
-   const char **name;
-
-   if (!dladdr(sym, &info))
-      return FALSE;
-   handle = dlopen(info.dli_fname, RTLD_LAZY | RTLD_LOCAL | RTLD_NODELETE);
-   if (!handle)
-      return FALSE;
-
-   for (name = egl_g3d_st_names; *name; name++) {
-      st_proc proc = (st_proc) dlsym(handle, *name);
-      if (!proc) {
-         _eglLog(_EGL_WARNING, "%s is missing in %s", *name, info.dli_fname);
-         memset(stapi, 0, sizeof(*stapi));
-         dlclose(handle);
-         return FALSE;
-      }
-      *procs++ = proc;
-   }
-
-   dlclose(handle);
-   return TRUE;
-}
-
-#else /* HAVE_DLADDR */
-
-static boolean
-egl_g3d_fill_st(struct egl_g3d_st *stapi, void *sym)
-{
-#define ST_PUBLIC(name, ...) stapi->name = name;
-#include "st_public_tmp.h"
-   return TRUE;
-}
-
-#endif /* HAVE_DLADDR */
-
-static boolean
-egl_g3d_init_st(struct egl_g3d_st *stapi, const char *api)
-{
-   void *handle, *sym;
-   boolean res = FALSE;
-
-   /* already initialized */
-   if (stapi->st_notify_swapbuffers != NULL)
-      return TRUE;
-
-   handle = dlopen(NULL, RTLD_LAZY | RTLD_LOCAL);
-   if (!handle)
-      return FALSE;
-
-   sym = dlsym(handle, api);
-   if (sym && egl_g3d_fill_st(stapi, sym))
-      res = TRUE;
-
-   dlclose(handle);
-   return res;
-}
-
-static struct {
-   const char *symbol;
-   EGLint api_bit;
-} egl_g3d_st_info[NUM_EGL_G3D_STS] = {
-   { "st_api_OpenGL_ES1",  EGL_OPENGL_ES_BIT },
-   { "st_api_OpenVG",      EGL_OPENVG_BIT },
-   { "st_api_OpenGL_ES2",  EGL_OPENGL_ES2_BIT },
-   { "st_api_OpenGL",      EGL_OPENGL_BIT },
-};
-
-const struct egl_g3d_st *
-egl_g3d_get_st(enum egl_g3d_st_api api)
-{
-   static struct egl_g3d_st all_trackers[NUM_EGL_G3D_STS];
-
-   if (egl_g3d_init_st(&all_trackers[api], egl_g3d_st_info[api].symbol)) {
-      all_trackers[api].api_bit = egl_g3d_st_info[api].api_bit;
-      return &all_trackers[api];
-   }
-   else {
-      return NULL;
-   }
-}
diff --git a/src/gallium/state_trackers/egl/common/st_public_tmp.h b/src/gallium/state_trackers/egl/common/st_public_tmp.h
deleted file mode 100644
index 562dd68c15..0000000000
--- a/src/gallium/state_trackers/egl/common/st_public_tmp.h
+++ /dev/null
@@ -1,20 +0,0 @@
-ST_PUBLIC(st_create_context,              struct st_context *,       struct pipe_context *pipe, const __GLcontextModes *visual, struct st_context *share)
-ST_PUBLIC(st_destroy_context,             void,                      struct st_context *st)
-ST_PUBLIC(st_copy_context_state,          void,                      struct st_context *dst, struct st_context *src, uint mask)
-ST_PUBLIC(st_create_framebuffer,          struct st_framebuffer *,   const __GLcontextModes *visual, enum pipe_format colorFormat, enum pipe_format depthFormat, enum pipe_format stencilFormat, uint width, uint height, void *privateData)
-ST_PUBLIC(st_resize_framebuffer,          void,                      struct st_framebuffer *stfb, uint width, uint height)
-ST_PUBLIC(st_set_framebuffer_surface,     void,                      struct st_framebuffer *stfb, uint surfIndex, struct pipe_surface *surf)
-ST_PUBLIC(st_get_framebuffer_dimensions,  void,                      struct st_framebuffer *stfb, uint *width, uint *height)
-ST_PUBLIC(st_get_framebuffer_surface,     int,                       struct st_framebuffer *stfb, uint surfIndex, struct pipe_surface **surface)
-ST_PUBLIC(st_get_framebuffer_texture,     int,                       struct st_framebuffer *stfb, uint surfIndex, struct pipe_texture **texture)
-ST_PUBLIC(st_framebuffer_private,         void *,                    struct st_framebuffer *stfb)
-ST_PUBLIC(st_unreference_framebuffer,     void,                      struct st_framebuffer *stfb)
-ST_PUBLIC(st_make_current,                GLboolean,                 struct st_context *st, struct st_framebuffer *draw, struct st_framebuffer *read, void *winsys_drawable_handle)
-ST_PUBLIC(st_get_current,                 struct st_context *,       void)
-ST_PUBLIC(st_flush,                       void,                      struct st_context *st, uint pipeFlushFlags, struct pipe_fence_handle **fence)
-ST_PUBLIC(st_finish,                      void,                      struct st_context *st)
-ST_PUBLIC(st_notify_swapbuffers,          void,                      struct st_framebuffer *stfb)
-ST_PUBLIC(st_bind_texture_surface,        int,                       struct pipe_surface *ps, int target, int level, enum pipe_format format)
-ST_PUBLIC(st_unbind_texture_surface,      int,                       struct pipe_surface *ps, int target, int level)
-ST_PUBLIC(st_get_proc_address,            st_proc,                   const char *procname)
-#undef ST_PUBLIC
diff --git a/src/gallium/state_trackers/es/Makefile b/src/gallium/state_trackers/es/Makefile
index b036551271..e33685d247 100644
--- a/src/gallium/state_trackers/es/Makefile
+++ b/src/gallium/state_trackers/es/Makefile
@@ -38,6 +38,7 @@ SYS_LIBS = -lm -pthread
 
 
 INCLUDE_DIRS = \
+	-I$(TOP)/src/mesa \
 	-I$(TOP)/src/gallium/include
 
 .c.o:
diff --git a/src/gallium/state_trackers/es/st_es1.c b/src/gallium/state_trackers/es/st_es1.c
index 25bc53b21e..4e89e06b34 100644
--- a/src/gallium/state_trackers/es/st_es1.c
+++ b/src/gallium/state_trackers/es/st_es1.c
@@ -1,3 +1,8 @@
-#include "pipe/p_compiler.h"
+#include "state_tracker/st_manager.h"
 
 PUBLIC const int st_api_OpenGL_ES1 = 1;
+
+PUBLIC const struct st_module st_module_OpenGL_ES1 = {
+   .api = ST_API_OPENGL_ES1,
+   .create_api = st_manager_create_api
+};
diff --git a/src/gallium/state_trackers/es/st_es2.c b/src/gallium/state_trackers/es/st_es2.c
index 171ea62b97..82e88b176a 100644
--- a/src/gallium/state_trackers/es/st_es2.c
+++ b/src/gallium/state_trackers/es/st_es2.c
@@ -1,3 +1,8 @@
-#include "pipe/p_compiler.h"
+#include "state_tracker/st_manager.h"
 
 PUBLIC const int st_api_OpenGL_ES2 = 1;
+
+PUBLIC const struct st_module st_module_OpenGL_ES2 = {
+   .api = ST_API_OPENGL_ES2,
+   .create_api = st_manager_create_api
+};
diff --git a/src/gallium/state_trackers/glx/xlib/Makefile b/src/gallium/state_trackers/glx/xlib/Makefile
index 8c7cc524df..582e72bb46 100644
--- a/src/gallium/state_trackers/glx/xlib/Makefile
+++ b/src/gallium/state_trackers/glx/xlib/Makefile
@@ -12,6 +12,7 @@ C_SOURCES = \
 	glx_api.c \
 	glx_getproc.c \
 	glx_usefont.c \
-	xm_api.c
+	xm_api.c \
+	xm_st.c
 
 include ../../../Makefile.template
diff --git a/src/gallium/state_trackers/glx/xlib/SConscript b/src/gallium/state_trackers/glx/xlib/SConscript
index bb20235150..d6c16ad2f5 100644
--- a/src/gallium/state_trackers/glx/xlib/SConscript
+++ b/src/gallium/state_trackers/glx/xlib/SConscript
@@ -20,6 +20,7 @@ if env['platform'] == 'linux' \
 		'glx_getproc.c',
 		'glx_usefont.c',
 		'xm_api.c',
+		'xm_st.c',
 		]
     )
     Export('st_xlib')
diff --git a/src/gallium/state_trackers/glx/xlib/glx_api.c b/src/gallium/state_trackers/glx/xlib/glx_api.c
index 2454585850..4930cd6cd5 100644
--- a/src/gallium/state_trackers/glx/xlib/glx_api.c
+++ b/src/gallium/state_trackers/glx/xlib/glx_api.c
@@ -35,12 +35,9 @@
 
 #include "xm_api.h"
 #include "main/context.h"
-#include "main/config.h"
 #include "main/macros.h"
 #include "main/imports.h"
 #include "main/version.h"
-#include "state_tracker/st_context.h"
-#include "state_tracker/st_public.h"
 
 
 /* This indicates the client-side GLX API and GLX encoder version. */
@@ -1304,7 +1301,7 @@ glXCopyContext( Display *dpy, GLXContext src, GLXContext dst,
    if (MakeCurrent_PrevContext == src) {
       _mesa_Flush();
    }
-   st_copy_context_state( xm_src->st, xm_dst->st, (GLuint) mask );
+   XMesaCopyContext(xm_src, xm_dst, mask);
 }
 
 
diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.c b/src/gallium/state_trackers/glx/xlib/xm_api.c
index f4d7133d2f..62a2bfcfa0 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.c
@@ -54,11 +54,9 @@
 #endif
 
 #include "xm_api.h"
-#include "main/context.h"
-#include "main/framebuffer.h"
+#include "xm_st.h"
 
-#include "state_tracker/st_public.h"
-#include "state_tracker/st_context.h"
+#include "main/context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
 #include "pipe/p_context.h"
@@ -72,19 +70,56 @@
  * global.
  */
 static struct xm_driver driver;
+static struct st_api *stapi;
 
 void xmesa_set_driver( const struct xm_driver *templ )
 {
    driver = *templ;
+   stapi = driver.create_st_api();
 }
 
-/**
- * Global X driver lock
- */
-pipe_mutex _xmesa_lock;
+static XMesaDisplay
+xmesa_init_display( Display *display )
+{
+   pipe_static_mutex(init_mutex);
+   static struct xmesa_display xm_display;
+   XMesaDisplay xmdpy;
+   
+   pipe_mutex_lock(init_mutex);
+
+   /* TODO support for multiple displays */
+   xmdpy = &xm_display;
+
+   if (!xmdpy->display && display) {
+      xmdpy->display = display;
+      xmdpy->screen = driver.create_pipe_screen(display);
+      xmdpy->smapi = CALLOC_STRUCT(st_manager);
+      if (xmdpy->smapi)
+         xmdpy->smapi->screen = xmdpy->screen;
+
+      if (xmdpy->screen && xmdpy->smapi) {
+         pipe_mutex_init(xmdpy->mutex);
+      }
+      else {
+         if (xmdpy->screen) {
+            xmdpy->screen->destroy(xmdpy->screen);
+            xmdpy->screen = NULL;
+         }
+         if (xmdpy->smapi) {
+            FREE(xmdpy->smapi);
+            xmdpy->smapi = NULL;
+         }
 
-static struct pipe_screen *screen = NULL;
+         xmdpy->display = NULL;
+      }
+   }
+   if (!xmdpy->display || xmdpy->display != display)
+      xmdpy = NULL;
 
+   pipe_mutex_unlock(init_mutex);
+
+   return xmdpy;
+}
 
 /**********************************************************************/
 /*****                     X Utility Functions                    *****/
@@ -194,12 +229,13 @@ void
 xmesa_get_window_size(Display *dpy, XMesaBuffer b,
                       GLuint *width, GLuint *height)
 {
+   XMesaDisplay xmdpy = xmesa_init_display(dpy);
    Status stat;
 
-   pipe_mutex_lock(_xmesa_lock);
+   pipe_mutex_lock(xmdpy->mutex);
    XSync(b->xm_visual->display, 0); /* added for Chromium */
    stat = get_drawable_size(dpy, b->ws.drawable, width, height);
-   pipe_mutex_unlock(_xmesa_lock);
+   pipe_mutex_unlock(xmdpy->mutex);
 
    if (!stat) {
       /* probably querying a window that's recently been destroyed */
@@ -273,49 +309,43 @@ choose_pixel_format(XMesaVisual v)
    return 0;
 }
 
-
-
 /**
- * Query the default gallium screen for a Z/Stencil format that
- * at least matches the given depthBits and stencilBits.
+ * Choose a depth/stencil format that is "better" than the given depth and
+ * stencil sizes.
  */
-static void
-xmesa_choose_z_stencil_format(int depthBits, int stencilBits,
-                              enum pipe_format *depthFormat,
-                              enum pipe_format *stencilFormat)
+static enum pipe_format
+choose_depth_stencil_format(XMesaDisplay xmdpy, int depth, int stencil)
 {
    const enum pipe_texture_target target = PIPE_TEXTURE_2D;
    const unsigned tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
    const unsigned geom_flags = (PIPE_TEXTURE_GEOM_NON_SQUARE |
                                 PIPE_TEXTURE_GEOM_NON_POWER_OF_TWO);
-   static enum pipe_format formats[] = {
-      PIPE_FORMAT_S8Z24_UNORM,
-      PIPE_FORMAT_Z24S8_UNORM,
-      PIPE_FORMAT_Z16_UNORM,
-      PIPE_FORMAT_Z32_UNORM
-   };
-   int i;
+   enum pipe_format formats[8], fmt;
+   int count, i;
 
-   assert(screen);
+   count = 0;
+   if (depth <= 24 && stencil <= 8) {
+      formats[count++] = PIPE_FORMAT_S8Z24_UNORM;
+      formats[count++] = PIPE_FORMAT_Z24S8_UNORM;
+   }
 
-   *depthFormat = *stencilFormat = PIPE_FORMAT_NONE;
+   if (!stencil) {
+      if (depth <= 16)
+         formats[count++] = PIPE_FORMAT_Z16_UNORM;
+      if (depth <= 32)
+         formats[count++] = PIPE_FORMAT_Z32_UNORM;
+   }
 
-   /* search for supported format */
-   for (i = 0; i < Elements(formats); i++) {
-      if (screen->is_format_supported(screen, formats[i],
+   fmt = PIPE_FORMAT_NONE;
+   for (i = 0; i < count; i++) {
+      if (xmdpy->screen->is_format_supported(xmdpy->screen, formats[i],
                                       target, tex_usage, geom_flags)) {
-         *depthFormat = formats[i];
+         fmt = formats[i];
          break;
       }
    }
 
-   if (stencilBits) {
-      *stencilFormat = *depthFormat;
-   }
-
-   /* XXX we should check that he chosen format has at least as many bits
-    * as what was requested.
-    */
+   return fmt;
 }
 
 
@@ -324,7 +354,7 @@ xmesa_choose_z_stencil_format(int depthBits, int stencilBits,
 /*****                Linked list of XMesaBuffers                 *****/
 /**********************************************************************/
 
-XMesaBuffer XMesaBufferList = NULL;
+static XMesaBuffer XMesaBufferList = NULL;
 
 
 /**
@@ -342,13 +372,15 @@ static XMesaBuffer
 create_xmesa_buffer(Drawable d, BufferType type,
                     XMesaVisual vis, Colormap cmap)
 {
+   XMesaDisplay xmdpy = xmesa_init_display(vis->display);
    XMesaBuffer b;
-   GLframebuffer *fb;
-   enum pipe_format colorFormat, depthFormat, stencilFormat;
    uint width, height;
 
    ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
 
+   if (!xmdpy)
+      return NULL;
+
    b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
    if (!b)
       return NULL;
@@ -361,24 +393,12 @@ create_xmesa_buffer(Drawable d, BufferType type,
    b->type = type;
    b->cmap = cmap;
 
-   /* determine PIPE_FORMATs for buffers */
-   colorFormat = choose_pixel_format(vis);
-
-   xmesa_choose_z_stencil_format(vis->mesa_visual.depthBits,
-                                 vis->mesa_visual.stencilBits,
-                                 &depthFormat, &stencilFormat);
-
-
    get_drawable_size(vis->display, d, &width, &height);
 
    /*
     * Create framebuffer, but we'll plug in our own renderbuffers below.
     */
-   b->stfb = st_create_framebuffer(&vis->mesa_visual,
-                                   colorFormat, depthFormat, stencilFormat,
-                                   width, height,
-                                   (void *) b);
-   fb = &b->stfb->Base;
+   b->stfb = xmesa_create_st_framebuffer(xmdpy, b);
 
    /* GLX_EXT_texture_from_pixmap */
    b->TextureTarget = 0;
@@ -422,24 +442,21 @@ xmesa_free_buffer(XMesaBuffer buffer)
 
    for (b = XMesaBufferList; b; b = b->Next) {
       if (b == buffer) {
-         struct gl_framebuffer *fb = &buffer->stfb->Base;
-
          /* unlink buffer from list */
          if (prev)
             prev->Next = buffer->Next;
          else
             XMesaBufferList = buffer->Next;
 
-         /* mark as delete pending */
-         fb->DeletePending = GL_TRUE;
-
          /* Since the X window for the XMesaBuffer is going away, we don't
           * want to dereference this pointer in the future.
           */
          b->ws.drawable = 0;
 
-         /* Unreference.  If count = zero we'll really delete the buffer */
-         _mesa_reference_framebuffer(&fb, NULL);
+         /* XXX we should move the buffer to a delete-pending list and destroy
+          * the buffer until it is no longer current.
+          */
+         xmesa_destroy_st_framebuffer(buffer->stfb);
 
          free(buffer);
 
@@ -596,10 +613,12 @@ XMesaVisual XMesaCreateVisual( Display *display,
                                GLint level,
                                GLint visualCaveat )
 {
+   XMesaDisplay xmdpy = xmesa_init_display(display);
    XMesaVisual v;
    GLint red_bits, green_bits, blue_bits, alpha_bits;
 
-   xmesa_init( display );
+   if (!xmdpy)
+      return NULL;
 
    /* For debugging only */
    if (_mesa_getenv("MESA_XSYNC")) {
@@ -681,6 +700,26 @@ XMesaVisual XMesaCreateVisual( Display *display,
                             accum_blue_size, accum_alpha_size,
                             0 );
 
+   v->stvis.buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
+   if (db_flag)
+      v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_LEFT_MASK;
+   if (stereo_flag) {
+      v->stvis.buffer_mask |= ST_ATTACHMENT_FRONT_RIGHT_MASK;
+      if (db_flag)
+         v->stvis.buffer_mask |= ST_ATTACHMENT_BACK_RIGHT_MASK;
+   }
+
+   v->stvis.color_format = choose_pixel_format(v);
+   v->stvis.depth_stencil_format =
+      choose_depth_stencil_format(xmdpy, depth_size, stencil_size);
+
+   v->stvis.accum_format = (accum_red_size +
+         accum_green_size + accum_blue_size + accum_alpha_size) ?
+      PIPE_FORMAT_R16G16B16A16_SNORM : PIPE_FORMAT_NONE;
+
+   v->stvis.samples = num_samples;
+   v->stvis.render_buffer = ST_ATTACHMENT_INVALID;
+
    /* XXX minor hack */
    v->mesa_visual.level = level;
    return v;
@@ -696,17 +735,12 @@ void XMesaDestroyVisual( XMesaVisual v )
 
 
 /**
- * Do one-time initializations.
+ * Do per-display initializations.
  */
 void
 xmesa_init( Display *display )
 {
-   static GLboolean firstTime = GL_TRUE;
-   if (firstTime) {
-      pipe_mutex_init(_xmesa_lock);
-      screen = driver.create_pipe_screen( display );
-      firstTime = GL_FALSE;
-   }
+   xmesa_init_display(display);
 }
 
 
@@ -720,51 +754,33 @@ xmesa_init( Display *display )
 PUBLIC
 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
 {
-   struct pipe_context *pipe = NULL;
+   XMesaDisplay xmdpy = xmesa_init_display(v->display);
    XMesaContext c;
-   GLcontext *mesaCtx;
-   uint pf;
 
-   xmesa_init( v->display );
+   if (!xmdpy)
+      return NULL;
 
    /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
    c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
    if (!c)
       return NULL;
 
-   pf = choose_pixel_format(v);
-   assert(pf);
-
    c->xm_visual = v;
    c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
    c->xm_read_buffer = NULL;
 
-   if (screen == NULL)
-      goto fail;
-
-   /* Trace screen knows how to properly wrap context creation in the
-    * wrapped screen, so nothing special to do here:
-    */
-   pipe = screen->context_create(screen, (void *) c);
-   if (pipe == NULL)
-      goto fail;
-
-   c->st = st_create_context(pipe, 
-                             &v->mesa_visual,
-                             share_list ? share_list->st : NULL);
+   c->st = stapi->create_context(stapi, xmdpy->smapi,
+         &v->stvis, (share_list) ? share_list->st : NULL);
    if (c->st == NULL)
       goto fail;
 
-   mesaCtx = c->st->ctx;
-   c->st->ctx->DriverCtx = c;
+   c->st->st_manager_private = (void *) c;
 
    return c;
 
 fail:
    if (c->st)
-      st_destroy_context(c->st);
-   else if (pipe)
-      pipe->destroy(pipe);
+      c->st->destroy(c->st);
 
    free(c);
    return NULL;
@@ -775,7 +791,7 @@ fail:
 PUBLIC
 void XMesaDestroyContext( XMesaContext c )
 {
-   st_destroy_context(c->st);
+   c->st->destroy(c->st);
 
    /* FIXME: We should destroy the screen here, but if we do so, surfaces may 
     * outlive it, causing segfaults
@@ -881,7 +897,6 @@ XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
 {
    GET_CURRENT_CONTEXT(ctx);
    XMesaBuffer b;
-   GLuint width, height;
 
    assert(v);
 
@@ -889,19 +904,18 @@ XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
    if (!b)
       return NULL;
 
-   /* get pixmap size, update framebuffer/renderbuffer dims */
-   xmesa_get_window_size(v->display, b, &width, &height);
-   _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);
+   /* get pixmap size */
+   xmesa_get_window_size(v->display, b, &b->width, &b->height);
 
    if (target == 0) {
       /* examine dims */
       if (ctx->Extensions.ARB_texture_non_power_of_two) {
          target = GLX_TEXTURE_2D_EXT;
       }
-      else if (   _mesa_bitcount(width)  == 1
-               && _mesa_bitcount(height) == 1) {
+      else if (   _mesa_bitcount(b->width)  == 1
+               && _mesa_bitcount(b->height) == 1) {
          /* power of two size */
-         if (height == 1) {
+         if (b->height == 1) {
             target = GLX_TEXTURE_1D_EXT;
          }
          else {
@@ -974,23 +988,20 @@ XMesaDestroyBuffer(XMesaBuffer b)
 
 
 /**
- * Query the current window size and update the corresponding GLframebuffer
- * and all attached renderbuffers.
- * Called when:
- *  1. the first time a buffer is bound to a context.
- *  2. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
- * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
- * when resizing a buffer when no rendering context is bound.
+ * Query the current drawable size and notify the binding context.
  */
 void
-xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
+xmesa_check_buffer_size(XMesaBuffer b)
 {
-   GLuint width, height;
-   xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
-   st_resize_framebuffer(drawBuffer->stfb, width, height);
-}
+   XMesaContext xmctx = XMesaGetCurrentContext();
 
+   if (b->type == PBUFFER)
+      return;
 
+   xmesa_get_window_size(b->xm_visual->display, b, &b->width, &b->height);
+   if (xmctx && xmctx->xm_buffer == b)
+      xmctx->st->notify_invalid_framebuffer(xmctx->st, b->stfb);
+}
 
 
 /*
@@ -1017,22 +1028,21 @@ GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
 	  c->xm_read_buffer == readBuffer)
 	 return GL_TRUE;
 
+      xmesa_check_buffer_size(drawBuffer);
+      if (readBuffer != drawBuffer)
+         xmesa_check_buffer_size(readBuffer);
+
       c->xm_buffer = drawBuffer;
       c->xm_read_buffer = readBuffer;
 
-      st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb, 
-                      &drawBuffer->ws);
-
-      xmesa_check_and_update_buffer_size(c, drawBuffer);
-      if (readBuffer != drawBuffer)
-         xmesa_check_and_update_buffer_size(c, readBuffer);
+      stapi->make_current(stapi, c->st, drawBuffer->stfb, readBuffer->stfb);
 
       /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
       drawBuffer->wasCurrent = GL_TRUE;
    }
    else {
       /* Detach */
-      st_make_current( NULL, NULL, NULL, NULL );
+      stapi->make_current(stapi, NULL, NULL, NULL);
 
    }
    return GL_TRUE;
@@ -1051,14 +1061,8 @@ GLboolean XMesaUnbindContext( XMesaContext c )
 
 XMesaContext XMesaGetCurrentContext( void )
 {
-   GET_CURRENT_CONTEXT(ctx);
-   if (ctx) {
-      XMesaContext xmesa = xmesa_context(ctx);
-      return xmesa;
-   }
-   else {
-      return 0;
-   }
+   struct st_context_iface *st = stapi->get_current(stapi);
+   return (XMesaContext) (st) ? st->st_manager_private : NULL;
 }
 
 
@@ -1070,17 +1074,17 @@ XMesaContext XMesaGetCurrentContext( void )
 PUBLIC
 void XMesaSwapBuffers( XMesaBuffer b )
 {
-   struct pipe_surface *frontLeftSurf;
-
-   st_swapbuffers(b->stfb, &frontLeftSurf, NULL);
-
-   if (frontLeftSurf) {
-      screen->flush_frontbuffer( screen,
-                                 frontLeftSurf, 
-                                 &b->ws );
+   XMesaContext xmctx = XMesaGetCurrentContext();
+
+   if (xmctx && xmctx->xm_buffer == b) {
+      xmctx->st->flush( xmctx->st,
+            PIPE_FLUSH_RENDER_CACHE | 
+            PIPE_FLUSH_SWAPBUFFERS |
+            PIPE_FLUSH_FRAME,
+            NULL);
    }
 
-   xmesa_check_and_update_buffer_size(NULL, b);
+   xmesa_swap_st_framebuffer(b->stfb);
 }
 
 
@@ -1090,21 +1094,9 @@ void XMesaSwapBuffers( XMesaBuffer b )
  */
 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
 {
-   struct pipe_surface *surf_front;
-   struct pipe_surface *surf_back;
-   struct pipe_context *pipe = NULL; /* XXX fix */
-
-   st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT, &surf_front);
-   st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT, &surf_back);
-
-   if (!surf_front || !surf_back)
-      return;
-
-   assert(pipe);
-   pipe->surface_copy(pipe,
-                      surf_front, x, y,  /* dest */
-                      surf_back, x, y,   /* src */
-                      width, height);
+   xmesa_copy_st_framebuffer(b->stfb,
+         ST_ATTACHMENT_BACK_LEFT, ST_ATTACHMENT_FRONT_LEFT,
+         x, y, width, height);
 }
 
 
@@ -1112,7 +1104,14 @@ void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
 void XMesaFlush( XMesaContext c )
 {
    if (c && c->xm_visual->display) {
-      st_finish(c->st);
+      XMesaDisplay xmdpy = xmesa_init_display(c->xm_visual->display);
+      struct pipe_fence_handle *fence = NULL;
+
+      c->st->flush(c->st, PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, &fence);
+      if (fence) {
+         xmdpy->screen->fence_finish(xmdpy->screen, fence, 0);
+         xmdpy->screen->fence_reference(xmdpy->screen, &fence, NULL);
+      }
       XSync( c->xm_visual->display, False );
    }
 }
@@ -1186,3 +1185,10 @@ XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
 {
 }
 
+
+void
+XMesaCopyContext(XMesaContext src, XMesaContext dst, unsigned long mask)
+{
+   if (dst->st->copy)
+      dst->st->copy(dst->st, src->st, mask);
+}
diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.h b/src/gallium/state_trackers/glx/xlib/xm_api.h
index de47064b41..4f2c8a6e6a 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.h
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.h
@@ -58,8 +58,7 @@ and create a window, you must do the following to use the X/Mesa interface:
 
 
 #include "main/mtypes.h"
-#include "state_tracker/st_context.h"
-#include "state_tracker/st_public.h"
+#include "state_tracker/st_api.h"
 #include "os/os_thread.h"
 
 #include "state_tracker/xlib_sw_winsys.h"
@@ -68,11 +67,22 @@ and create a window, you must do the following to use the X/Mesa interface:
 # include <X11/Xlibint.h>
 # include <X11/Xutil.h>
 
+typedef struct xmesa_display *XMesaDisplay;
 typedef struct xmesa_buffer *XMesaBuffer;
 typedef struct xmesa_context *XMesaContext;
 typedef struct xmesa_visual *XMesaVisual;
 
 
+struct xmesa_display {
+   pipe_mutex mutex;
+
+   Display *display;
+   struct pipe_screen *screen;
+   struct st_manager *smapi;
+
+   struct pipe_context *pipe;
+};
+
 
 /*
  * Create a new X/Mesa visual.
@@ -258,16 +268,13 @@ XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
                                int format, int target, int mipmap);
 
 
+extern void
+XMesaCopyContext(XMesaContext src, XMesaContext dst, unsigned long mask);
 
 
 /***********************************************************************
  */
 
-extern pipe_mutex _xmesa_lock;
-
-extern struct xmesa_buffer *XMesaBufferList;
-
-
 /**
  * Visual inforation, derived from GLvisual.
  * Basically corresponds to an XVisualInfo.
@@ -280,6 +287,8 @@ struct xmesa_visual {
    GLint BitsPerPixel;		/* True bits per pixel for XImages */
 
    GLboolean ximage_flag;	/* Use XImage for back buffer (not pixmap)? */
+
+   struct st_visual stvis;
 };
 
 
@@ -288,7 +297,7 @@ struct xmesa_visual {
  * Basically corresponds to a GLXContext.
  */
 struct xmesa_context {
-   struct st_context *st;
+   struct st_context_iface *st;
    XMesaVisual xm_visual;	/** pixel format info */
    XMesaBuffer xm_buffer;	/** current drawbuffer */
    XMesaBuffer xm_read_buffer;  /** current readbuffer */
@@ -311,7 +320,7 @@ typedef enum {
  * Basically corresponds to a GLXDrawable.
  */
 struct xmesa_buffer {
-   struct st_framebuffer *stfb;
+   struct st_framebuffer_iface *stfb;
    struct xlib_drawable ws;
 
    GLboolean wasCurrent;	/* was ever the current buffer? */
@@ -335,33 +344,15 @@ struct xmesa_buffer {
    GLint TextureMipmap; /** 0 or 1 */
 
    struct xmesa_buffer *Next;	/* Linked list pointer: */
-};
-
-
-
-/** cast wrapper */
-static INLINE XMesaContext
-xmesa_context(GLcontext *ctx)
-{
-   return (XMesaContext) ctx->DriverCtx;
-}
 
+   unsigned width, height;
+};
 
-/** cast wrapper */
-static INLINE XMesaBuffer
-xmesa_buffer(GLframebuffer *fb)
-{
-   struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
-   return (XMesaBuffer) st_framebuffer_private(stfb);
-}
 
 
 extern void
 xmesa_init(Display *dpy);
 
-extern void
-xmesa_delete_framebuffer(struct gl_framebuffer *fb);
-
 extern XMesaBuffer
 xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis);
 
@@ -370,7 +361,7 @@ xmesa_get_window_size(Display *dpy, XMesaBuffer b,
                       GLuint *width, GLuint *height);
 
 extern void
-xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer);
+xmesa_check_buffer_size(XMesaBuffer b);
 
 extern void
 xmesa_destroy_buffers_on_display(Display *dpy);
@@ -378,13 +369,13 @@ xmesa_destroy_buffers_on_display(Display *dpy);
 static INLINE GLuint
 xmesa_buffer_width(XMesaBuffer b)
 {
-   return b->stfb->Base.Width;
+   return b->width;
 }
 
 static INLINE GLuint
 xmesa_buffer_height(XMesaBuffer b)
 {
-   return b->stfb->Base.Height;
+   return b->height;
 }
 
 
diff --git a/src/gallium/state_trackers/glx/xlib/xm_public.h b/src/gallium/state_trackers/glx/xlib/xm_public.h
index ac6a8ffb27..950eb21521 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_public.h
+++ b/src/gallium/state_trackers/glx/xlib/xm_public.h
@@ -26,19 +26,23 @@
  * 
  **************************************************************************/
 
-#ifndef XM_WINSYS_H
-#define XM_WINSYS_H
+#ifndef XM_PUBLIC_H
+#define XM_PUBLIC_H
 
-struct xm_driver;
+#include <X11/Xlib.h>
+
+struct pipe_screen;
+struct st_api;
 
 /* This is the driver interface required by the glx/xlib state tracker. 
  */
 struct xm_driver {
    struct pipe_screen *(*create_pipe_screen)( Display *display );
+   struct st_api *(*create_st_api)( void );
 };
 
 extern void
 xmesa_set_driver( const struct xm_driver *driver );
 
 
-#endif
+#endif /* XM_PUBLIC_H */
diff --git a/src/gallium/state_trackers/glx/xlib/xm_st.c b/src/gallium/state_trackers/glx/xlib/xm_st.c
new file mode 100644
index 0000000000..b6ed7e8e1e
--- /dev/null
+++ b/src/gallium/state_trackers/glx/xlib/xm_st.c
@@ -0,0 +1,332 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+
+#include "xm_api.h"
+#include "xm_st.h"
+
+struct xmesa_st_framebuffer {
+   XMesaDisplay display;
+   XMesaBuffer buffer;
+   struct pipe_screen *screen;
+
+   struct st_visual stvis;
+
+   unsigned texture_width, texture_height, texture_mask;
+   struct pipe_texture *textures[ST_ATTACHMENT_COUNT];
+
+   struct pipe_surface *display_surface;
+};
+
+static INLINE struct xmesa_st_framebuffer *
+xmesa_st_framebuffer(struct st_framebuffer_iface *stfbi)
+{
+   return (struct xmesa_st_framebuffer *) stfbi->st_manager_private;
+}
+
+/**
+ * Display an attachment to the xlib_drawable of the framebuffer.
+ */
+static boolean
+xmesa_st_framebuffer_display(struct st_framebuffer_iface *stfbi,
+                             enum st_attachment_type statt)
+{
+   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
+   struct pipe_texture *ptex = xstfb->textures[statt];
+   struct pipe_surface *psurf;
+
+   if (!ptex)
+      return TRUE;
+
+   psurf = xstfb->display_surface;
+   /* (re)allocate the surface for the texture to be displayed */
+   if (!psurf || psurf->texture != ptex) {
+      pipe_surface_reference(&xstfb->display_surface, NULL);
+
+      psurf = xstfb->screen->get_tex_surface(xstfb->screen,
+            ptex, 0, 0, 0, PIPE_BUFFER_USAGE_CPU_READ);
+      if (!psurf)
+         return FALSE;
+
+      xstfb->display_surface = psurf;
+   }
+
+   xstfb->screen->flush_frontbuffer(xstfb->screen, psurf, &xstfb->buffer->ws);
+
+   return TRUE;
+}
+
+/**
+ * Copy the contents between the attachments.
+ */
+static void
+xmesa_st_framebuffer_copy_textures(struct st_framebuffer_iface *stfbi,
+                                   enum st_attachment_type src_statt,
+                                   enum st_attachment_type dst_statt,
+                                   unsigned x, unsigned y,
+                                   unsigned width, unsigned height)
+{
+   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
+   struct pipe_texture *src_ptex = xstfb->textures[src_statt];
+   struct pipe_texture *dst_ptex = xstfb->textures[dst_statt];
+   struct pipe_surface *src, *dst;
+   struct pipe_context *pipe;
+
+   if (!src_ptex || !dst_ptex)
+      return;
+
+   pipe = xstfb->display->pipe;
+   if (!pipe) {
+      pipe = xstfb->screen->context_create(xstfb->screen, NULL);
+      if (!pipe)
+         return;
+      xstfb->display->pipe = pipe;
+   }
+
+   src = xstfb->screen->get_tex_surface(xstfb->screen,
+         src_ptex, 0, 0, 0, PIPE_BUFFER_USAGE_GPU_READ);
+   dst = xstfb->screen->get_tex_surface(xstfb->screen,
+         dst_ptex, 0, 0, 0, PIPE_BUFFER_USAGE_GPU_WRITE);
+
+   if (src && dst)
+      pipe->surface_copy(pipe, dst, x, y, src, x, y, width, height);
+
+   pipe_surface_reference(&src, NULL);
+   pipe_surface_reference(&dst, NULL);
+}
+
+/**
+ * Remove outdated textures and create the requested ones.
+ */
+static void
+xmesa_st_framebuffer_validate_textures(struct st_framebuffer_iface *stfbi,
+                                       unsigned width, unsigned height,
+                                       unsigned mask)
+{
+   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
+   struct pipe_texture templ;
+   unsigned i;
+
+   /* remove outdated textures */
+   if (xstfb->texture_width != width || xstfb->texture_height != height) {
+      for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
+         pipe_texture_reference(&xstfb->textures[i], NULL);
+   }
+
+   memset(&templ, 0, sizeof(templ));
+   templ.target = PIPE_TEXTURE_2D;
+   templ.width0 = width;
+   templ.height0 = height;
+   templ.depth0 = 1;
+   templ.last_level = 0;
+
+   for (i = 0; i < ST_ATTACHMENT_COUNT; i++) {
+      enum pipe_format format;
+      unsigned tex_usage;
+
+      /* the texture already exists or not requested */
+      if (xstfb->textures[i] || !(mask & (1 << i))) {
+         /* remember the texture */
+         if (xstfb->textures[i])
+            mask |= (1 << i);
+         continue;
+      }
+
+      switch (i) {
+      case ST_ATTACHMENT_FRONT_LEFT:
+      case ST_ATTACHMENT_BACK_LEFT:
+      case ST_ATTACHMENT_FRONT_RIGHT:
+      case ST_ATTACHMENT_BACK_RIGHT:
+         format = xstfb->stvis.color_format;
+         tex_usage = PIPE_TEXTURE_USAGE_DISPLAY_TARGET |
+                     PIPE_TEXTURE_USAGE_RENDER_TARGET;
+         break;
+      case ST_ATTACHMENT_DEPTH_STENCIL:
+         format = xstfb->stvis.depth_stencil_format;
+         tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
+         break;
+      default:
+         format = PIPE_FORMAT_NONE;
+         break;
+      }
+
+      if (format != PIPE_FORMAT_NONE) {
+         templ.format = format;
+         templ.tex_usage = tex_usage;
+
+         xstfb->textures[i] =
+            xstfb->screen->texture_create(xstfb->screen, &templ);
+      }
+   }
+
+   xstfb->texture_width = width;
+   xstfb->texture_height = height;
+   xstfb->texture_mask = mask;
+}
+
+static boolean 
+xmesa_st_framebuffer_validate(struct st_framebuffer_iface *stfbi,
+                              const enum st_attachment_type *statts,
+                              unsigned count,
+                              struct pipe_texture **out)
+{
+   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
+   unsigned statt_mask, new_mask, i;
+   boolean resized;
+
+   statt_mask = 0x0;
+   for (i = 0; i < count; i++)
+      statt_mask |= 1 << statts[i];
+   /* record newly allocated textures */
+   new_mask = statt_mask & ~xstfb->texture_mask;
+
+   resized = (xstfb->buffer->width != xstfb->texture_width ||
+              xstfb->buffer->height != xstfb->texture_height);
+
+   /* revalidate textures */
+   if (resized || new_mask) {
+      xmesa_st_framebuffer_validate_textures(stfbi,
+            xstfb->buffer->width, xstfb->buffer->height, statt_mask);
+
+      if (!resized) {
+         enum st_attachment_type back, front;
+
+         back = ST_ATTACHMENT_BACK_LEFT;
+         front = ST_ATTACHMENT_FRONT_LEFT;
+         /* copy the contents if front is newly allocated and back is not */
+         if ((statt_mask & (1 << back)) &&
+             (new_mask & (1 << front)) &&
+             !(new_mask & (1 << back))) {
+            xmesa_st_framebuffer_copy_textures(stfbi, back, front,
+                  0, 0, xstfb->texture_width, xstfb->texture_height);
+         }
+      }
+   }
+
+   for (i = 0; i < count; i++) {
+      out[i] = NULL;
+      pipe_texture_reference(&out[i], xstfb->textures[statts[i]]);
+   }
+
+   return TRUE;
+}
+
+static boolean
+xmesa_st_framebuffer_flush_front(struct st_framebuffer_iface *stfbi,
+                                 enum st_attachment_type statt)
+{
+   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
+   boolean ret;
+
+   ret = xmesa_st_framebuffer_display(stfbi, statt);
+   if (ret)
+      xmesa_check_buffer_size(xstfb->buffer);
+
+   return ret;
+}
+
+struct st_framebuffer_iface *
+xmesa_create_st_framebuffer(XMesaDisplay xmdpy, XMesaBuffer b)
+{
+   struct st_framebuffer_iface *stfbi;
+   struct xmesa_st_framebuffer *xstfb;
+
+   assert(xmdpy->display == b->xm_visual->display);
+
+   stfbi = CALLOC_STRUCT(st_framebuffer_iface);
+   xstfb = CALLOC_STRUCT(xmesa_st_framebuffer);
+   if (!stfbi || !xstfb) {
+      if (stfbi)
+         FREE(stfbi);
+      if (xstfb)
+         FREE(xstfb);
+      return NULL;
+   }
+
+   xstfb->display = xmdpy;
+   xstfb->buffer = b;
+   xstfb->screen = xmdpy->screen;
+   xstfb->stvis = b->xm_visual->stvis;
+
+   stfbi->visual = &xstfb->stvis;
+   stfbi->flush_front = xmesa_st_framebuffer_flush_front;
+   stfbi->validate = xmesa_st_framebuffer_validate;
+   stfbi->st_manager_private = (void *) xstfb;
+
+   return stfbi;
+}
+
+void
+xmesa_destroy_st_framebuffer(struct st_framebuffer_iface *stfbi)
+{
+   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
+   int i;
+
+   pipe_surface_reference(&xstfb->display_surface, NULL);
+
+   for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
+      pipe_texture_reference(&xstfb->textures[i], NULL);
+
+   FREE(xstfb);
+   FREE(stfbi);
+}
+
+void
+xmesa_swap_st_framebuffer(struct st_framebuffer_iface *stfbi)
+{
+   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
+   boolean ret;
+
+   ret = xmesa_st_framebuffer_display(stfbi, ST_ATTACHMENT_BACK_LEFT);
+   if (ret) {
+      struct pipe_texture **front, **back, *tmp;
+
+      front = &xstfb->textures[ST_ATTACHMENT_FRONT_LEFT];
+      back = &xstfb->textures[ST_ATTACHMENT_BACK_LEFT];
+      /* swap textures only if the front texture has been allocated */
+      if (*front) {
+         tmp = *front;
+         *front = *back;
+         *back = tmp;
+      }
+
+      xmesa_check_buffer_size(xstfb->buffer);
+   }
+}
+
+void
+xmesa_copy_st_framebuffer(struct st_framebuffer_iface *stfbi,
+                          enum st_attachment_type src,
+                          enum st_attachment_type dst,
+                          int x, int y, int w, int h)
+{
+   xmesa_st_framebuffer_copy_textures(stfbi, src, dst, x, y, w, h);
+   if (dst == ST_ATTACHMENT_FRONT_LEFT)
+      xmesa_st_framebuffer_display(stfbi, dst);
+}
diff --git a/src/gallium/state_trackers/glx/xlib/xm_st.h b/src/gallium/state_trackers/glx/xlib/xm_st.h
new file mode 100644
index 0000000000..396495c189
--- /dev/null
+++ b/src/gallium/state_trackers/glx/xlib/xm_st.h
@@ -0,0 +1,51 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#ifndef _XM_ST_H_
+#define _XM_ST_H_
+
+#include "pipe/p_compiler.h"
+#include "state_tracker/st_api.h"
+
+#include "xm_api.h"
+
+struct st_framebuffer_iface *
+xmesa_create_st_framebuffer(XMesaDisplay xmdpy, XMesaBuffer b);
+
+void
+xmesa_destroy_st_framebuffer(struct st_framebuffer_iface *stfbi);
+
+void
+xmesa_swap_st_framebuffer(struct st_framebuffer_iface *stfbi);
+
+void
+xmesa_copy_st_framebuffer(struct st_framebuffer_iface *stfbi,
+                          enum st_attachment_type src,
+                          enum st_attachment_type dst,
+                          int x, int y, int w, int h);
+
+#endif /* _XM_ST_H_ */
diff --git a/src/gallium/state_trackers/vega/Makefile b/src/gallium/state_trackers/vega/Makefile
index 7f04b2aa83..7c315de827 100644
--- a/src/gallium/state_trackers/vega/Makefile
+++ b/src/gallium/state_trackers/vega/Makefile
@@ -25,6 +25,7 @@ VG_SOURCES = \
            api_transform.c \
            vgu.c        \
            vg_context.c \
+           vg_manager.c \
            vg_state.c   \
            vg_tracker.c \
            vg_translate.c \
diff --git a/src/gallium/state_trackers/vega/api_context.c b/src/gallium/state_trackers/vega/api_context.c
index 47db102dd2..eb2fbe26e7 100644
--- a/src/gallium/state_trackers/vega/api_context.c
+++ b/src/gallium/state_trackers/vega/api_context.c
@@ -26,6 +26,7 @@
 
 #include "VG/openvg.h"
 
+#include "vg_manager.h"
 #include "vg_context.h"
 
 #include "pipe/p_context.h"
@@ -55,6 +56,8 @@ void vgFlush(void)
 
    pipe = ctx->pipe;
    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+
+   vg_manager_flush_frontbuffer(ctx);
 }
 
 void vgFinish(void)
diff --git a/src/gallium/state_trackers/vega/api_masks.c b/src/gallium/state_trackers/vega/api_masks.c
index 7eb5ea1f07..2f2d925252 100644
--- a/src/gallium/state_trackers/vega/api_masks.c
+++ b/src/gallium/state_trackers/vega/api_masks.c
@@ -117,10 +117,6 @@ clear_with_quad(struct vg_context *st, float x0, float y0,
      x1, y1);
    */
 
-   if (st->pipe->screen && st->pipe->screen->update_buffer)
-      st->pipe->screen->update_buffer( st->pipe->screen,
-                                       st->pipe->priv );
-
    cso_save_blend(st->cso_context);
    cso_save_rasterizer(st->cso_context);
    cso_save_fragment_shader(st->cso_context);
diff --git a/src/gallium/state_trackers/vega/vg_context.c b/src/gallium/state_trackers/vega/vg_context.c
index 170391ec03..7769112a31 100644
--- a/src/gallium/state_trackers/vega/vg_context.c
+++ b/src/gallium/state_trackers/vega/vg_context.c
@@ -32,6 +32,7 @@
 #include "shader.h"
 #include "asm_util.h"
 #include "st_inlines.h"
+#include "vg_manager.h"
 
 #include "pipe/p_context.h"
 #include "util/u_inlines.h"
@@ -305,6 +306,8 @@ static void update_clip_state(struct vg_context *ctx)
 
 void vg_validate_state(struct vg_context *ctx)
 {
+   vg_manager_validate_framebuffer(ctx);
+
    if ((ctx->state.dirty & BLEND_DIRTY)) {
       struct pipe_blend_state *blend = &ctx->state.g3d.blend;
       memset(blend, 0, sizeof(struct pipe_blend_state));
diff --git a/src/gallium/state_trackers/vega/vg_context.h b/src/gallium/state_trackers/vega/vg_context.h
index 804e9e76d7..17c7d2ad1c 100644
--- a/src/gallium/state_trackers/vega/vg_context.h
+++ b/src/gallium/state_trackers/vega/vg_context.h
@@ -33,6 +33,7 @@
 #include "pipe/p_state.h"
 #include "util/u_pointer.h"
 #include "util/u_math.h"
+#include "state_tracker/st_api.h"
 
 #include "cso_cache/cso_hash.h"
 #include "cso_cache/cso_context.h"
@@ -58,6 +59,9 @@ struct st_framebuffer {
 
    struct pipe_texture *blend_texture;
 
+   struct st_framebuffer_iface *iface;
+   enum st_attachment_type strb_att;
+
    void *privateData;
 };
 
@@ -84,6 +88,8 @@ enum dirty_state {
 
 struct vg_context
 {
+   struct st_context_iface iface;
+
    struct pipe_context *pipe;
 
    struct {
@@ -101,6 +107,7 @@ struct vg_context
    VGErrorCode _error;
 
    struct st_framebuffer *draw_buffer;
+   int32_t draw_buffer_invalid;
 
    struct cso_hash *owned_objects[VG_OBJECT_LAST];
 
diff --git a/src/gallium/state_trackers/vega/vg_manager.c b/src/gallium/state_trackers/vega/vg_manager.c
new file mode 100644
index 0000000000..25c2e853f2
--- /dev/null
+++ b/src/gallium/state_trackers/vega/vg_manager.c
@@ -0,0 +1,373 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#include "state_tracker/st_api.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_screen.h"
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+
+#include "vg_manager.h"
+#include "vg_context.h"
+#include "vg_tracker.h" /* for st_resize_framebuffer */
+#include "image.h"
+
+/**
+ * Flush the front buffer if the current context renders to the front buffer.
+ */
+void
+vg_manager_flush_frontbuffer(struct vg_context *ctx)
+{
+   struct st_framebuffer *stfb = ctx->draw_buffer;
+
+   if (!stfb)
+      return;
+
+   /* st_public.h is used */
+   if (!stfb->iface) {
+      struct pipe_screen *screen = ctx->pipe->screen;
+      if (screen->flush_frontbuffer) {
+         screen->flush_frontbuffer(screen,
+               stfb->strb->surface, ctx->pipe->priv);
+      }
+      return;
+   }
+
+   switch (stfb->strb_att) {
+   case ST_ATTACHMENT_FRONT_LEFT:
+   case ST_ATTACHMENT_FRONT_RIGHT:
+      stfb->iface->flush_front(stfb->iface, stfb->strb_att);
+      break;
+   default:
+      break;
+   }
+}
+
+/**
+ * Re-validate the framebuffer.
+ */
+void
+vg_manager_validate_framebuffer(struct vg_context *ctx)
+{
+   struct pipe_screen *screen = ctx->pipe->screen;
+   struct st_framebuffer *stfb = ctx->draw_buffer;
+   struct st_renderbuffer *rb;
+   struct pipe_texture *pt;
+
+   /* no binding surface */
+   if (!stfb)
+      return;
+
+   /* st_public.h is used */
+   if (!stfb->iface) {
+      struct pipe_screen *screen = ctx->pipe->screen;
+      if (screen->update_buffer)
+         screen->update_buffer(screen, ctx->pipe->priv);
+      return;
+   }
+
+   if (!p_atomic_read(&ctx->draw_buffer_invalid))
+      return;
+
+   /* validate the fb */
+   if (!stfb->iface->validate(stfb->iface, &stfb->strb_att, 1, &pt) || !pt)
+      return;
+
+   rb = stfb->strb;
+   if (rb->texture == pt) {
+      pipe_texture_reference(&pt, NULL);
+      return;
+   }
+
+   /* unreference existing ones */
+   pipe_surface_reference(&rb->surface, NULL);
+   pipe_texture_reference(&rb->texture, NULL);
+
+   rb->texture = pt;
+   rb->surface = screen->get_tex_surface(screen, rb->texture, 0, 0, 0,
+         PIPE_BUFFER_USAGE_GPU_READ | PIPE_BUFFER_USAGE_GPU_WRITE);
+
+   rb->width = rb->surface->width;
+   rb->height = rb->surface->height;
+
+   st_resize_framebuffer(stfb, rb->width, rb->height);
+
+   p_atomic_set(&ctx->draw_buffer_invalid, FALSE);
+}
+
+
+static void
+vg_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
+                                      struct st_framebuffer_iface *stfbi)
+{
+   struct vg_context *ctx = (struct vg_context *) stctxi;
+   p_atomic_set(&ctx->draw_buffer_invalid, TRUE);
+}
+
+static void
+vg_context_flush(struct st_context_iface *stctxi, unsigned flags,
+                 struct pipe_fence_handle **fence)
+{
+   struct vg_context *ctx = (struct vg_context *) stctxi;
+   ctx->pipe->flush(ctx->pipe, flags, fence);
+   if (flags & PIPE_FLUSH_RENDER_CACHE)
+      vg_manager_flush_frontbuffer(ctx);
+}
+
+static void
+vg_context_destroy(struct st_context_iface *stctxi)
+{
+   struct vg_context *ctx = (struct vg_context *) stctxi;
+   vg_destroy_context(ctx);
+}
+
+static struct st_context_iface *
+vg_api_create_context(struct st_api *stapi, struct st_manager *smapi,
+                      const struct st_visual *visual,
+                      struct st_context_iface *shared_stctxi)
+{
+   struct vg_context *shared_ctx = (struct vg_context *) shared_stctxi;
+   struct vg_context *ctx;
+   struct pipe_context *pipe;
+
+   pipe = smapi->screen->context_create(smapi->screen, NULL);
+   if (!pipe)
+      return NULL;
+   ctx = vg_create_context(pipe, NULL, shared_ctx);
+   if (!ctx) {
+      pipe->destroy(pipe);
+      return NULL;
+   }
+
+   ctx->iface.destroy = vg_context_destroy;
+
+   ctx->iface.notify_invalid_framebuffer =
+      vg_context_notify_invalid_framebuffer;
+   ctx->iface.flush = vg_context_flush;
+
+   ctx->iface.teximage = NULL;
+   ctx->iface.copy = NULL;
+
+   ctx->iface.st_context_private = (void *) smapi;
+
+   return &ctx->iface;
+}
+
+static struct st_renderbuffer *
+create_renderbuffer(enum pipe_format format)
+{
+   struct st_renderbuffer *strb;
+
+   strb = CALLOC_STRUCT(st_renderbuffer);
+   if (strb)
+      strb->format = format;
+
+   return strb;
+}
+
+static void
+destroy_renderbuffer(struct st_renderbuffer *strb)
+{
+   pipe_surface_reference(&strb->surface, NULL);
+   pipe_texture_reference(&strb->texture, NULL);
+   free(strb);
+}
+
+/**
+ * Decide the buffer to render to.
+ */
+static enum st_attachment_type
+choose_attachment(struct st_framebuffer_iface *stfbi)
+{
+   enum st_attachment_type statt;
+
+   statt = stfbi->visual->render_buffer;
+   if (statt != ST_ATTACHMENT_INVALID) {
+      /* use the buffer given by the visual, unless it is unavailable */
+      if (!st_visual_have_buffers(stfbi->visual, 1 << statt)) {
+         switch (statt) {
+         case ST_ATTACHMENT_BACK_LEFT:
+            statt = ST_ATTACHMENT_FRONT_LEFT;
+            break;
+         case ST_ATTACHMENT_BACK_RIGHT:
+            statt = ST_ATTACHMENT_FRONT_RIGHT;
+            break;
+         default:
+            break;
+         }
+
+         if (!st_visual_have_buffers(stfbi->visual, 1 << statt))
+            statt = ST_ATTACHMENT_INVALID;
+      }
+   }
+
+   return statt;
+}
+
+/**
+ * Bind the context to the given framebuffers.
+ */
+static boolean
+vg_context_bind_framebuffers(struct st_context_iface *stctxi,
+                             struct st_framebuffer_iface *stdrawi,
+                             struct st_framebuffer_iface *streadi)
+{
+   struct vg_context *ctx = (struct vg_context *) stctxi;
+   struct st_framebuffer *stfb;
+   enum st_attachment_type strb_att;
+
+   /* the draw and read framebuffers must be the same */
+   if (stdrawi != streadi)
+      return FALSE;
+
+   p_atomic_set(&ctx->draw_buffer_invalid, TRUE);
+
+   strb_att = (stdrawi) ? choose_attachment(stdrawi) : ST_ATTACHMENT_INVALID;
+
+   if (ctx->draw_buffer) {
+      stfb = ctx->draw_buffer;
+
+      /* free the existing fb */
+      if (!stdrawi ||
+          stfb->strb_att != strb_att ||
+          stfb->strb->format != stdrawi->visual->color_format ||
+          stfb->dsrb->format != stdrawi->visual->depth_stencil_format) {
+         destroy_renderbuffer(stfb->strb);
+         destroy_renderbuffer(stfb->dsrb);
+         free(stfb);
+
+         ctx->draw_buffer = NULL;
+      }
+   }
+
+   if (!stdrawi)
+      return TRUE;
+
+   if (strb_att == ST_ATTACHMENT_INVALID)
+      return FALSE;
+
+   /* create a new fb */
+   if (!ctx->draw_buffer) {
+      stfb = CALLOC_STRUCT(st_framebuffer);
+      if (!stfb)
+         return FALSE;
+
+      stfb->strb = create_renderbuffer(stdrawi->visual->color_format);
+      if (!stfb->strb) {
+         free(stfb);
+         return FALSE;
+      }
+
+      stfb->dsrb = create_renderbuffer(stdrawi->visual->depth_stencil_format);
+      if (!stfb->dsrb) {
+         free(stfb->strb);
+         free(stfb);
+         return FALSE;
+      }
+
+      stfb->width = 0;
+      stfb->height = 0;
+      stfb->strb_att = strb_att;
+
+      ctx->draw_buffer = stfb;
+   }
+
+   ctx->draw_buffer->iface = stdrawi;
+
+   return TRUE;
+}
+
+static boolean
+vg_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
+                    struct st_framebuffer_iface *stdrawi,
+                    struct st_framebuffer_iface *streadi)
+{
+   struct vg_context *ctx = (struct vg_context *) stctxi;
+
+   if (stctxi)
+      vg_context_bind_framebuffers(stctxi, stdrawi, streadi);
+   vg_set_current_context(ctx);
+
+   return TRUE;
+}
+
+static struct st_context_iface *
+vg_api_get_current(struct st_api *stapi)
+{
+   struct vg_context *ctx = vg_current_context();
+
+   return (ctx) ? &ctx->iface : NULL;
+}
+
+static boolean
+vg_api_is_visual_supported(struct st_api *stapi,
+                           const struct st_visual *visual)
+{
+   /* the impl requires a depth/stencil buffer */
+   if (visual->depth_stencil_format == PIPE_FORMAT_NONE)
+      return FALSE;
+
+   return TRUE;
+}
+
+static st_proc_t
+vg_api_get_proc_address(struct st_api *stapi, const char *procname)
+{
+   /* TODO */
+   return (st_proc_t) NULL;
+}
+
+static void
+vg_api_destroy(struct st_api *stapi)
+{
+   free(stapi);
+}
+
+static struct st_api *
+vg_module_create_api(void)
+{
+   struct st_api *stapi;
+
+   stapi = CALLOC_STRUCT(st_api);
+   if (stapi) {
+      stapi->destroy = vg_api_destroy;
+      stapi->get_proc_address = vg_api_get_proc_address;
+      stapi->is_visual_supported = vg_api_is_visual_supported;
+
+      stapi->create_context = vg_api_create_context;
+      stapi->make_current = vg_api_make_current;
+      stapi->get_current = vg_api_get_current;
+   }
+
+   return stapi;
+}
+
+PUBLIC const struct st_module st_module_OpenVG = {
+   .api = ST_API_OPENVG,
+   .create_api = vg_module_create_api,
+};
diff --git a/src/gallium/state_trackers/vega/vg_manager.h b/src/gallium/state_trackers/vega/vg_manager.h
new file mode 100644
index 0000000000..1a276c0f35
--- /dev/null
+++ b/src/gallium/state_trackers/vega/vg_manager.h
@@ -0,0 +1,40 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#ifndef VG_MANAGER_H
+#define VG_MANAGER_H
+
+#include "state_tracker/st_api.h"
+#include "vg_context.h"
+
+void
+vg_manager_flush_frontbuffer(struct vg_context *ctx);
+
+void
+vg_manager_validate_framebuffer(struct vg_context *ctx);
+
+#endif /* VG_MANAGER_H */
diff --git a/src/gallium/targets/libgl-xlib/xlib.c b/src/gallium/targets/libgl-xlib/xlib.c
index 5bb6c5c38c..eff4b4778b 100644
--- a/src/gallium/targets/libgl-xlib/xlib.c
+++ b/src/gallium/targets/libgl-xlib/xlib.c
@@ -39,9 +39,15 @@
 #include "target-helpers/wrap_screen.h"
 #include "xm_public.h"
 
+#include "state_tracker/st_manager.h"
+
 /* advertise OpenGL support */
 PUBLIC const int st_api_OpenGL = 1;
 
+PUBLIC const struct st_module st_module_OpenGL = {
+   .api = ST_API_OPENGL,
+   .create_api = st_manager_create_api
+};
 
 /* Helper function to build a subset of a driver stack consisting of
  * one of the software rasterizers (cell, llvmpipe, softpipe) and the
@@ -100,9 +106,10 @@ fail:
    return NULL;
 }
 
-struct xm_driver xlib_driver = 
+static struct xm_driver xlib_driver = 
 {
    .create_pipe_screen = swrast_xlib_create_screen,
+   .create_st_api = st_manager_create_api,
 };
 
 
diff --git a/src/mesa/SConscript b/src/mesa/SConscript
index 86da6f58bd..c85085434e 100644
--- a/src/mesa/SConscript
+++ b/src/mesa/SConscript
@@ -182,6 +182,7 @@ if env['platform'] != 'winddk':
 		'state_tracker/st_format.c',
 		'state_tracker/st_framebuffer.c',
 		'state_tracker/st_gen_mipmap.c',
+		'state_tracker/st_manager.c',
 		'state_tracker/st_mesa_to_tgsi.c',
 		'state_tracker/st_program.c',
 		'state_tracker/st_texture.c',
diff --git a/src/mesa/sources.mak b/src/mesa/sources.mak
index d59e24de1f..d6ae696e39 100644
--- a/src/mesa/sources.mak
+++ b/src/mesa/sources.mak
@@ -214,6 +214,7 @@ STATETRACKER_SOURCES = \
 	state_tracker/st_format.c \
 	state_tracker/st_framebuffer.c \
 	state_tracker/st_gen_mipmap.c \
+	state_tracker/st_manager.c \
 	state_tracker/st_mesa_to_tgsi.c \
 	state_tracker/st_program.c \
 	state_tracker/st_texture.c
diff --git a/src/mesa/state_tracker/st_atom.c b/src/mesa/state_tracker/st_atom.c
index 7806df4a53..9fa4dae5ca 100644
--- a/src/mesa/state_tracker/st_atom.c
+++ b/src/mesa/state_tracker/st_atom.c
@@ -34,6 +34,7 @@
 #include "st_atom.h"
 #include "st_cb_bitmap.h"
 #include "st_program.h"
+#include "st_manager.h"
 
 #include "pipe/p_context.h"
 
@@ -136,9 +137,7 @@ void st_validate_state( struct st_context *st )
 
    check_program_state( st );
 
-   if (st->pipe->screen->update_buffer)
-      st->pipe->screen->update_buffer(st->pipe->screen,
-				      st->pipe->priv);
+   st_manager_validate_framebuffers(st);
 
    if (state->st == 0)
       return;
diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index abf0c8d6cb..114a8596ad 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -48,6 +48,7 @@
 #include "st_format.h"
 #include "st_public.h"
 #include "st_texture.h"
+#include "st_manager.h"
 
 #include "util/u_format.h"
 #include "util/u_rect.h"
@@ -614,8 +615,18 @@ check_create_front_buffers(GLcontext *ctx, struct gl_framebuffer *fb)
 static void
 st_DrawBuffers(GLcontext *ctx, GLsizei count, const GLenum *buffers)
 {
+   GLframebuffer *fb = ctx->DrawBuffer;
+   GLuint i;
+
    (void) count;
    (void) buffers;
+
+   /* add the renderbuffers on demand */
+   for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
+      gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
+      st_manager_add_color_renderbuffer(ctx->st, fb, idx);
+   }
+
    check_create_front_buffers(ctx, ctx->DrawBuffer);
 }
 
@@ -626,8 +637,13 @@ st_DrawBuffers(GLcontext *ctx, GLsizei count, const GLenum *buffers)
 static void
 st_ReadBuffer(GLcontext *ctx, GLenum buffer)
 {
+   GLframebuffer *fb = ctx->ReadBuffer;
+
    (void) buffer;
-   check_create_front_buffers(ctx, ctx->ReadBuffer);
+
+   /* add the renderbuffer on demand */
+   st_manager_add_color_renderbuffer(ctx->st, fb, fb->_ColorReadBufferIndex);
+   check_create_front_buffers(ctx, fb);
 }
 
 
diff --git a/src/mesa/state_tracker/st_cb_flush.c b/src/mesa/state_tracker/st_cb_flush.c
index 28a384ba49..30e7afcf2a 100644
--- a/src/mesa/state_tracker/st_cb_flush.c
+++ b/src/mesa/state_tracker/st_cb_flush.c
@@ -40,6 +40,7 @@
 #include "st_cb_clear.h"
 #include "st_cb_fbo.h"
 #include "st_public.h"
+#include "st_manager.h"
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
@@ -74,12 +75,9 @@ display_front_buffer(struct st_context *st)
       = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 
    if (strb) {
-      struct pipe_surface *front_surf = strb->surface;
-      
       /* Hook for copying "fake" frontbuffer if necessary:
        */
-      st->pipe->screen->flush_frontbuffer( st->pipe->screen, front_surf,
-                                           st->winsys_drawable_handle );
+      st_manager_flush_frontbuffer(st);
 
       /*
         st->frontbuffer_status = FRONT_STATUS_UNDEFINED;
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c
index 080a5f9bfb..7afb275fe2 100644
--- a/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/src/mesa/state_tracker/st_cb_readpixels.c
@@ -45,6 +45,7 @@
 
 #include "st_debug.h"
 #include "st_context.h"
+#include "st_atom.h"
 #include "st_cb_readpixels.h"
 #include "st_cb_fbo.h"
 #include "st_public.h"
@@ -350,6 +351,8 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
    /* XXX convolution not done yet */
    assert((transferOps & IMAGE_CONVOLUTION_BIT) == 0);
 
+   st_validate_state(ctx->st);
+
    /* Do all needed clipping here, so that we can forget about it later */
    if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
       /* The ReadPixels transfer is totally outside the window bounds */
diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index ca6d4dfb06..7c1a0b8bc5 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -30,9 +30,9 @@
 #include "vbo/vbo.h"
 #include "shader/shader_api.h"
 #include "glapi/glapi.h"
+#include "st_context.h"
 #include "st_public.h"
 #include "st_debug.h"
-#include "st_context.h"
 #include "st_cb_accum.h"
 #include "st_cb_bitmap.h"
 #include "st_cb_blit.h"
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index e2d34fb3d1..2d81c4ca63 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -31,6 +31,7 @@
 #include "main/mtypes.h"
 #include "shader/prog_cache.h"
 #include "pipe/p_state.h"
+#include "state_tracker/st_api.h"
 
 
 struct st_context;
@@ -73,6 +74,8 @@ struct st_tracked_state {
 
 struct st_context
 {
+   struct st_context_iface iface;
+
    GLcontext *ctx;
 
    struct pipe_context *pipe;
@@ -206,6 +209,11 @@ struct st_framebuffer
    GLframebuffer Base;
    void *Private;
    GLuint InitWidth, InitHeight;
+
+   struct st_framebuffer_iface *iface;
+   enum st_attachment_type statts[ST_ATTACHMENT_COUNT];
+   unsigned num_statts;
+   int32_t revalidate;
 };
 
 
diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
new file mode 100644
index 0000000000..1b005c1ee1
--- /dev/null
+++ b/src/mesa/state_tracker/st_manager.c
@@ -0,0 +1,799 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#include "state_tracker/st_api.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_screen.h"
+#include "util/u_format.h"
+#include "util/u_pointer.h"
+#include "util/u_inlines.h"
+#include "util/u_atomic.h"
+
+#include "main/mtypes.h"
+#include "main/context.h"
+#include "main/texobj.h"
+#include "main/teximage.h"
+#include "main/texstate.h"
+#include "main/texfetch.h"
+#include "main/fbobject.h"
+#include "main/framebuffer.h"
+#include "main/renderbuffer.h"
+#include "st_texture.h"
+
+#include "st_context.h"
+#include "st_format.h"
+#include "st_cb_fbo.h"
+#include "st_manager.h"
+
+/* these functions are defined in st_context.c */
+struct st_context *
+st_create_context(struct pipe_context *pipe,
+                  const __GLcontextModes *visual,
+                  struct st_context *share);
+void st_destroy_context(struct st_context *st);
+void st_flush(struct st_context *st, uint pipeFlushFlags,
+              struct pipe_fence_handle **fence);
+
+/**
+ * Note that this function may fail.
+ */
+static INLINE struct st_framebuffer *
+st_framebuffer(GLframebuffer *fb)
+{
+   /* FBO cannot be casted.  See st_new_framebuffer */
+   return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
+}
+
+/**
+ * Map an attachment to a buffer index.
+ */
+static INLINE gl_buffer_index
+attachment_to_buffer_index(enum st_attachment_type statt)
+{
+   gl_buffer_index index;
+
+   switch (statt) {
+   case ST_ATTACHMENT_FRONT_LEFT:
+      index = BUFFER_FRONT_LEFT;
+      break;
+   case ST_ATTACHMENT_BACK_LEFT:
+      index = BUFFER_BACK_LEFT;
+      break;
+   case ST_ATTACHMENT_FRONT_RIGHT:
+      index = BUFFER_FRONT_RIGHT;
+      break;
+   case ST_ATTACHMENT_BACK_RIGHT:
+      index = BUFFER_BACK_RIGHT;
+      break;
+   case ST_ATTACHMENT_DEPTH_STENCIL:
+      index = BUFFER_DEPTH;
+      break;
+   case ST_ATTACHMENT_ACCUM:
+      index = BUFFER_ACCUM;
+      break;
+   case ST_ATTACHMENT_SAMPLE:
+   default:
+      index = BUFFER_COUNT;
+      break;
+   }
+
+   return index;
+}
+
+/**
+ * Map a buffer index to an attachment.
+ */
+static INLINE enum st_attachment_type
+buffer_index_to_attachment(gl_buffer_index index)
+{
+   enum st_attachment_type statt;
+
+   switch (index) {
+   case BUFFER_FRONT_LEFT:
+      statt = ST_ATTACHMENT_FRONT_LEFT;
+      break;
+   case BUFFER_BACK_LEFT:
+      statt = ST_ATTACHMENT_BACK_LEFT;
+      break;
+   case BUFFER_FRONT_RIGHT:
+      statt = ST_ATTACHMENT_FRONT_RIGHT;
+      break;
+   case BUFFER_BACK_RIGHT:
+      statt = ST_ATTACHMENT_BACK_RIGHT;
+      break;
+   case BUFFER_DEPTH:
+      statt = ST_ATTACHMENT_DEPTH_STENCIL;
+      break;
+   case BUFFER_ACCUM:
+      statt = ST_ATTACHMENT_ACCUM;
+      break;
+   default:
+      statt = ST_ATTACHMENT_INVALID;
+      break;
+   }
+
+   return statt;
+}
+
+/**
+ * Validate a framebuffer to make sure up-to-date pipe_textures are used.
+ */
+static void
+st_framebuffer_validate(struct st_framebuffer *stfb, struct st_context *st)
+{
+   struct pipe_screen *screen = st->pipe->screen;
+   struct pipe_texture *textures[ST_ATTACHMENT_COUNT];
+   uint width, height;
+   unsigned i;
+   boolean changed = FALSE;
+
+   if (!p_atomic_read(&stfb->revalidate))
+      return;
+
+   /* validate the fb */
+   if (!stfb->iface->validate(stfb->iface, stfb->statts, stfb->num_statts, textures))
+      return;
+
+   width = stfb->Base.Width;
+   height = stfb->Base.Height;
+
+   for (i = 0; i < stfb->num_statts; i++) {
+      struct st_renderbuffer *strb;
+      struct pipe_surface *ps;
+      gl_buffer_index idx;
+
+      if (!textures[i])
+         continue;
+
+      idx = attachment_to_buffer_index(stfb->statts[i]);
+      if (idx >= BUFFER_COUNT) {
+         pipe_texture_reference(&textures[i], NULL);
+         continue;
+      }
+
+      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
+      assert(strb);
+      if (strb->texture == textures[i]) {
+         pipe_texture_reference(&textures[i], NULL);
+         continue;
+      }
+
+      ps = screen->get_tex_surface(screen, textures[i], 0, 0, 0,
+            PIPE_BUFFER_USAGE_GPU_READ | PIPE_BUFFER_USAGE_GPU_WRITE);
+      if (ps) {
+         pipe_surface_reference(&strb->surface, ps);
+         pipe_texture_reference(&strb->texture, ps->texture);
+         /* ownership transfered */
+         pipe_surface_reference(&ps, NULL);
+
+         changed = TRUE;
+
+         strb->Base.Width = strb->surface->width;
+         strb->Base.Height = strb->surface->height;
+
+         width = strb->Base.Width;
+         height = strb->Base.Height;
+      }
+
+      pipe_texture_reference(&textures[i], NULL);
+   }
+
+   if (changed) {
+      st->dirty.st |= ST_NEW_FRAMEBUFFER;
+      _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
+
+      assert(stfb->Base.Width == width);
+      assert(stfb->Base.Height == height);
+   }
+
+   p_atomic_set(&stfb->revalidate, FALSE);
+}
+
+/**
+ * Update the attachments to validate by looping the existing renderbuffers.
+ */
+static void
+st_framebuffer_update_attachments(struct st_framebuffer *stfb)
+{
+   gl_buffer_index idx;
+
+   stfb->num_statts = 0;
+   for (idx = 0; idx < BUFFER_COUNT; idx++) {
+      struct st_renderbuffer *strb;
+      enum st_attachment_type statt;
+
+      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
+      if (!strb || strb->software)
+         continue;
+
+      statt = buffer_index_to_attachment(idx);
+      if (statt != ST_ATTACHMENT_INVALID &&
+          st_visual_have_buffers(stfb->iface->visual, 1 << statt))
+         stfb->statts[stfb->num_statts++] = statt;
+   }
+
+   p_atomic_set(&stfb->revalidate, TRUE);
+}
+
+/**
+ * Add a renderbuffer to the framebuffer.
+ */
+static boolean
+st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
+                                gl_buffer_index idx)
+{
+   struct gl_renderbuffer *rb;
+   enum pipe_format format;
+   int samples;
+   boolean sw;
+
+   /* do not distinguish depth/stencil buffers */
+   if (idx == BUFFER_STENCIL)
+      idx = BUFFER_DEPTH;
+
+   switch (idx) {
+   case BUFFER_DEPTH:
+      format = stfb->iface->visual->depth_stencil_format;
+      sw = FALSE;
+      break;
+   case BUFFER_ACCUM:
+      format = stfb->iface->visual->accum_format;
+      sw = TRUE;
+      break;
+   default:
+      format = stfb->iface->visual->color_format;
+      sw = FALSE;
+      break;
+   }
+
+   if (format == PIPE_FORMAT_NONE)
+      return FALSE;
+
+   samples = stfb->iface->visual->samples;
+   if (!samples)
+      samples = st_get_msaa();
+
+   rb = st_new_renderbuffer_fb(format, samples, sw);
+   if (!rb)
+      return FALSE;
+
+   if (idx != BUFFER_DEPTH) {
+      _mesa_add_renderbuffer(&stfb->Base, idx, rb);
+   }
+   else {
+      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
+         _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
+      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
+         _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
+   }
+
+   return TRUE;
+}
+
+/**
+ * Intialize a __GLcontextModes from a visual.
+ */
+static void
+st_visual_to_context_mode(const struct st_visual *visual,
+                          __GLcontextModes *mode)
+{
+   memset(mode, 0, sizeof(*mode));
+
+   if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
+      mode->doubleBufferMode = GL_TRUE;
+   if (st_visual_have_buffers(visual,
+            ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
+      mode->stereoMode = GL_TRUE;
+
+   if (visual->color_format != PIPE_FORMAT_NONE) {
+      mode->rgbMode = GL_TRUE;
+
+      mode->redBits =
+         util_format_get_component_bits(visual->color_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 0);
+      mode->greenBits =
+         util_format_get_component_bits(visual->color_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 1);
+      mode->blueBits =
+         util_format_get_component_bits(visual->color_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 2);
+      mode->alphaBits =
+         util_format_get_component_bits(visual->color_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 3);
+
+      mode->rgbBits = mode->redBits +
+         mode->greenBits + mode->blueBits + mode->alphaBits;
+   }
+
+   if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
+      mode->haveDepthBuffer = GL_TRUE;
+      mode->haveStencilBuffer = GL_TRUE;
+
+      mode->depthBits =
+         util_format_get_component_bits(visual->depth_stencil_format,
+               UTIL_FORMAT_COLORSPACE_ZS, 0);
+      mode->stencilBits =
+         util_format_get_component_bits(visual->depth_stencil_format,
+               UTIL_FORMAT_COLORSPACE_ZS, 1);
+   }
+
+   if (visual->accum_format != PIPE_FORMAT_NONE) {
+      mode->haveAccumBuffer = GL_TRUE;
+
+      mode->accumRedBits =
+         util_format_get_component_bits(visual->accum_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 0);
+      mode->accumGreenBits =
+         util_format_get_component_bits(visual->accum_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 1);
+      mode->accumBlueBits =
+         util_format_get_component_bits(visual->accum_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 2);
+      mode->accumAlphaBits =
+         util_format_get_component_bits(visual->accum_format,
+               UTIL_FORMAT_COLORSPACE_RGB, 3);
+   }
+
+   if (visual->samples) {
+      mode->sampleBuffers = 1;
+      mode->samples = visual->samples;
+   }
+}
+
+/**
+ * Determine the default draw or read buffer from a visual.
+ */
+static void
+st_visual_to_default_buffer(const struct st_visual *visual,
+                            GLenum *buffer, GLint *index)
+{
+   enum st_attachment_type statt;
+   GLenum buf;
+   gl_buffer_index idx;
+
+   statt = visual->render_buffer;
+   /* do nothing if an invalid render buffer is specified */
+   if (statt == ST_ATTACHMENT_INVALID ||
+       !st_visual_have_buffers(visual, 1 << statt))
+      return;
+
+   switch (statt) {
+   case ST_ATTACHMENT_FRONT_LEFT:
+      buf = GL_FRONT_LEFT;
+      idx = BUFFER_FRONT_LEFT;
+      break;
+   case ST_ATTACHMENT_BACK_LEFT:
+      buf = GL_BACK_LEFT;
+      idx = BUFFER_BACK_LEFT;
+      break;
+   case ST_ATTACHMENT_FRONT_RIGHT:
+      buf = GL_FRONT_RIGHT;
+      idx = BUFFER_FRONT_RIGHT;
+      break;
+   case ST_ATTACHMENT_BACK_RIGHT:
+      buf = GL_BACK_RIGHT;
+      idx = BUFFER_BACK_RIGHT;
+      break;
+   default:
+      buf = GL_NONE;
+      idx = BUFFER_COUNT;
+      break;
+   }
+
+   if (buf != GL_NONE) {
+      if (buffer)
+         *buffer = buf;
+      if (index)
+         *index = idx;
+   }
+}
+
+/**
+ * Create a framebuffer from a manager interface.
+ */
+static struct st_framebuffer *
+st_framebuffer_create(struct st_framebuffer_iface *stfbi)
+{
+   struct st_framebuffer *stfb;
+   __GLcontextModes mode;
+   gl_buffer_index idx;
+
+   stfb = CALLOC_STRUCT(st_framebuffer);
+   if (!stfb)
+      return NULL;
+
+   st_visual_to_context_mode(stfbi->visual, &mode);
+   _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
+
+   /* modify the draw/read buffers of the fb */
+   st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
+         &stfb->Base._ColorDrawBufferIndexes[0]);
+   st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
+         &stfb->Base._ColorReadBufferIndex);
+
+   stfb->iface = stfbi;
+
+   /* add the color buffer */
+   idx = stfb->Base._ColorDrawBufferIndexes[0];
+   if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
+      FREE(stfb);
+      return NULL;
+   }
+
+   st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
+   st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
+
+   st_framebuffer_update_attachments(stfb);
+
+   stfb->Base.Initialized = GL_TRUE;
+
+   return stfb;
+}
+
+/**
+ * Reference a framebuffer.
+ */
+static void
+st_framebuffer_reference(struct st_framebuffer **ptr,
+                         struct st_framebuffer *stfb)
+{
+   GLframebuffer *fb = &stfb->Base;
+   _mesa_reference_framebuffer((GLframebuffer **) ptr, fb);
+}
+
+static void
+st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
+                                      struct st_framebuffer_iface *stfbi)
+{
+   struct st_context *st = (struct st_context *) stctxi;
+   struct st_framebuffer *stfb;
+
+   /* either draw or read winsys fb */
+   stfb = st_framebuffer(st->ctx->WinSysDrawBuffer);
+   if (!stfb || stfb->iface != stfbi)
+      stfb = st_framebuffer(st->ctx->WinSysReadBuffer);
+   assert(stfb && stfb->iface == stfbi);
+
+   p_atomic_set(&stfb->revalidate, TRUE);
+}
+
+static void
+st_context_flush(struct st_context_iface *stctxi, unsigned flags,
+                 struct pipe_fence_handle **fence)
+{
+   struct st_context *st = (struct st_context *) stctxi;
+   st_flush(st, flags, fence);
+   if (flags & PIPE_FLUSH_RENDER_CACHE)
+      st_manager_flush_frontbuffer(st);
+}
+
+static boolean
+st_context_teximage(struct st_context_iface *stctxi, enum st_texture_type target,
+                    int level, enum pipe_format internal_format,
+                    struct pipe_texture *tex, boolean mipmap)
+{
+   struct st_context *st = (struct st_context *) stctxi;
+   GLcontext *ctx = st->ctx;
+   struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
+   struct gl_texture_object *texObj;
+   struct gl_texture_image *texImage;
+   struct st_texture_object *stObj;
+   struct st_texture_image *stImage;
+   GLenum internalFormat;
+
+   switch (target) {
+   case ST_TEXTURE_1D:
+      target = GL_TEXTURE_1D;
+      break;
+   case ST_TEXTURE_2D:
+      target = GL_TEXTURE_2D;
+      break;
+   case ST_TEXTURE_3D:
+      target = GL_TEXTURE_3D;
+      break;
+   case ST_TEXTURE_RECT:
+      target = GL_TEXTURE_RECTANGLE_ARB;
+      break;
+   default:
+      return FALSE;
+      break;
+   }
+
+   if (util_format_get_component_bits(internal_format,
+            UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
+      internalFormat = GL_RGBA;
+   else
+      internalFormat = GL_RGB;
+
+   texObj = _mesa_select_tex_object(ctx, texUnit, target);
+   _mesa_lock_texture(ctx, texObj);
+
+   stObj = st_texture_object(texObj);
+   /* switch to surface based */
+   if (!stObj->surface_based) {
+      _mesa_clear_texture_object(ctx, texObj);
+      stObj->surface_based = GL_TRUE;
+   }
+
+   texImage = _mesa_get_tex_image(ctx, texObj, target, level);
+   stImage = st_texture_image(texImage);
+   if (tex) {
+      _mesa_init_teximage_fields(ctx, target, texImage,
+            tex->width0, tex->height0, 1, 0, internalFormat);
+      texImage->TexFormat = st_ChooseTextureFormat(ctx, internalFormat,
+            GL_RGBA, GL_UNSIGNED_BYTE);
+      _mesa_set_fetch_functions(texImage, 2);
+   }
+   else {
+      _mesa_clear_texture_image(ctx, texImage);
+   }
+
+   pipe_texture_reference(&stImage->pt, tex);
+
+   _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
+   _mesa_unlock_texture(ctx, texObj);
+   
+   return TRUE;
+}
+
+static void
+st_context_destroy(struct st_context_iface *stctxi)
+{
+   struct st_context *st = (struct st_context *) stctxi;
+   st_destroy_context(st);
+}
+
+static struct st_context_iface *
+st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
+                      const struct st_visual *visual,
+                      struct st_context_iface *shared_stctxi)
+{
+   struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
+   struct st_context *st;
+   struct pipe_context *pipe;
+   __GLcontextModes mode;
+
+   pipe = smapi->screen->context_create(smapi->screen, NULL);
+   if (!pipe)
+      return NULL;
+
+   st_visual_to_context_mode(visual, &mode);
+   st = st_create_context(pipe, &mode, shared_ctx);
+   if (!st) {
+      pipe->destroy(pipe);
+      return NULL;
+   }
+
+   st->iface.destroy = st_context_destroy;
+
+   st->iface.notify_invalid_framebuffer =
+      st_context_notify_invalid_framebuffer;
+   st->iface.flush = st_context_flush;
+
+   st->iface.teximage = st_context_teximage;
+   st->iface.copy = NULL;
+
+   st->iface.st_context_private = (void *) smapi;
+
+   return &st->iface;
+}
+
+static boolean
+st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
+                    struct st_framebuffer_iface *stdrawi,
+                    struct st_framebuffer_iface *streadi)
+{
+   struct st_context *st = (struct st_context *) stctxi;
+   struct st_framebuffer *stdraw, *stread, *stfb;
+   boolean ret;
+
+   _glapi_check_multithread();
+
+   if (st) {
+      /* reuse/create the draw fb */
+      stfb = st_framebuffer(st->ctx->WinSysDrawBuffer);
+      if (stfb && stfb->iface == stdrawi) {
+         stdraw = NULL;
+         st_framebuffer_reference(&stdraw, stfb);
+      }
+      else {
+         stdraw = st_framebuffer_create(stdrawi);
+      }
+
+      /* reuse/create the read fb */
+      stfb = st_framebuffer(st->ctx->WinSysReadBuffer);
+      if (!stfb || stfb->iface != streadi)
+         stfb = stdraw;
+      if (stfb && stfb->iface == streadi) {
+         stread = NULL;
+         st_framebuffer_reference(&stread, stfb);
+      }
+      else {
+         stread = st_framebuffer_create(streadi);
+      }
+
+      if (stdraw && stread) {
+         st_framebuffer_validate(stdraw, st);
+         if (stread != stdraw)
+            st_framebuffer_validate(stread, st);
+
+         /* modify the draw/read buffers of the context */
+         st_visual_to_default_buffer(stdraw->iface->visual,
+               &st->ctx->Color.DrawBuffer[0], NULL);
+         st_visual_to_default_buffer(stread->iface->visual,
+               &st->ctx->Pixel.ReadBuffer, NULL);
+
+         ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
+      }
+      else {
+         ret = FALSE;
+      }
+
+      st_framebuffer_reference(&stdraw, NULL);
+      st_framebuffer_reference(&stread, NULL);
+   }
+   else {
+      ret = _mesa_make_current(NULL, NULL, NULL);
+   }
+
+   return ret;
+}
+
+static struct st_context_iface *
+st_api_get_current(struct st_api *stapi)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct st_context *st = (ctx) ? ctx->st : NULL;
+
+   return (st) ? &st->iface : NULL;
+}
+
+static boolean
+st_api_is_visual_supported(struct st_api *stapi,
+                           const struct st_visual *visual)
+{
+   return TRUE;
+}
+
+static st_proc_t
+st_api_get_proc_address(struct st_api *stapi, const char *procname)
+{
+   return (st_proc_t) _glapi_get_proc_address(procname);
+}
+
+static void
+st_api_destroy(struct st_api *stapi)
+{
+   FREE(stapi);
+}
+
+/**
+ * Flush the front buffer if the current context renders to the front buffer.
+ */
+void
+st_manager_flush_frontbuffer(struct st_context *st)
+{
+   struct st_framebuffer *stfb = st_framebuffer(st->ctx->DrawBuffer);
+   struct st_renderbuffer *strb = NULL;
+
+   if (stfb)
+      strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
+   if (!strb)
+      return;
+
+   /* st_public.h */
+   if (!stfb->iface) {
+      struct pipe_surface *front_surf = strb->surface;
+      st->pipe->screen->flush_frontbuffer(st->pipe->screen,
+            front_surf, st->winsys_drawable_handle);
+      return;
+   }
+
+   stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
+}
+
+/**
+ * Re-validate the framebuffers.
+ */
+void
+st_manager_validate_framebuffers(struct st_context *st)
+{
+   struct st_framebuffer *stdraw = st_framebuffer(st->ctx->DrawBuffer);
+   struct st_framebuffer *stread = st_framebuffer(st->ctx->ReadBuffer);
+
+   /* st_public.h */
+   if ((stdraw && !stdraw->iface) || (stread && !stread->iface)) {
+      struct pipe_screen *screen = st->pipe->screen;
+      if (screen->update_buffer)
+         screen->update_buffer(screen, st->pipe->priv);
+      return;
+   }
+
+   if (stdraw)
+      st_framebuffer_validate(stdraw, st);
+   if (stread && stread != stdraw)
+      st_framebuffer_validate(stread, st);
+}
+
+/**
+ * Add a color renderbuffer on demand.
+ */
+boolean
+st_manager_add_color_renderbuffer(struct st_context *st, GLframebuffer *fb,
+                                  gl_buffer_index idx)
+{
+   struct st_framebuffer *stfb = st_framebuffer(fb);
+
+   /* FBO or st_public.h */
+   if (!stfb || !stfb->iface)
+      return FALSE;
+
+   if (stfb->Base.Attachment[idx].Renderbuffer)
+      return TRUE;
+
+   switch (idx) {
+   case BUFFER_FRONT_LEFT:
+   case BUFFER_BACK_LEFT:
+   case BUFFER_FRONT_RIGHT:
+   case BUFFER_BACK_RIGHT:
+      break;
+   default:
+      return FALSE;
+      break;
+   }
+
+   if (!st_framebuffer_add_renderbuffer(stfb, idx))
+      return FALSE;
+
+   st_framebuffer_update_attachments(stfb);
+   st_invalidate_state(st->ctx, _NEW_BUFFERS);
+
+   return TRUE;
+}
+
+/**
+ * Create an st_api to manage the state tracker.
+ */
+struct st_api *
+st_manager_create_api(void)
+{
+   struct st_api *stapi;
+
+   stapi = CALLOC_STRUCT(st_api);
+   if (stapi) {
+      stapi->destroy = st_api_destroy;
+      stapi->get_proc_address = st_api_get_proc_address;
+      stapi->is_visual_supported = st_api_is_visual_supported;
+
+      stapi->create_context = st_api_create_context;
+      stapi->make_current = st_api_make_current;
+      stapi->get_current = st_api_get_current;
+   }
+
+   return stapi;
+}
diff --git a/src/mesa/state_tracker/st_manager.h b/src/mesa/state_tracker/st_manager.h
new file mode 100644
index 0000000000..a3f5199223
--- /dev/null
+++ b/src/mesa/state_tracker/st_manager.h
@@ -0,0 +1,47 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.9
+ *
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ */
+
+#ifndef ST_MANAGER_H
+#define ST_MANAGER_H
+
+#include "state_tracker/st_api.h"
+#include "st_context.h"
+
+void
+st_manager_flush_frontbuffer(struct st_context *st);
+
+void
+st_manager_validate_framebuffers(struct st_context *st);
+
+boolean
+st_manager_add_color_renderbuffer(struct st_context *st, GLframebuffer *fb,
+                                  gl_buffer_index idx);
+
+struct st_api *
+st_manager_create_api(void);
+
+#endif /* ST_MANAGER_H */