1 files changed, 332 insertions, 0 deletions

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);
+}