From 3ece9ace540447c4f0d340a6f9f27980b54f83fb Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Thu, 20 Mar 2008 14:49:56 -0600
Subject: gallium: glBitmap code now separated from glDraw/CopyPixels code

---
 src/mesa/state_tracker/st_cb_bitmap.h | 41 +++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/mesa/state_tracker/st_cb_bitmap.h

(limited to 'src/mesa/state_tracker/st_cb_bitmap.h')

diff --git a/src/mesa/state_tracker/st_cb_bitmap.h b/src/mesa/state_tracker/st_cb_bitmap.h
new file mode 100644
index 0000000000..ac19e0ebb1
--- /dev/null
+++ b/src/mesa/state_tracker/st_cb_bitmap.h
@@ -0,0 +1,41 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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_CB_BITMAP_H
+#define ST_CB_BITMAP_H
+
+
+extern void
+st_init_bitmap_functions(struct dd_function_table *functions);
+
+
+extern void
+st_destroy_bitmap(struct st_context *st);
+
+
+#endif /* ST_CB_BITMAP_H */
-- 
cgit v1.2.3


From c62b197b528293abb56b099503344e3cdd7d6c40 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Fri, 28 Mar 2008 14:53:47 -0600
Subject: gallium: implement a glBitmap cache

The bitmap cache attempts to accumulate a series of glBitmap calls in a
buffer to effectively render a whole bunch of bitmaps at once.

The cache can be disabled, if needed, by setting UseBitmapCache=GL_FALSE.
---
 src/mesa/state_tracker/st_atom.c      |   3 +
 src/mesa/state_tracker/st_cb_bitmap.c | 234 ++++++++++++++++++++++++++++++++--
 src/mesa/state_tracker/st_cb_bitmap.h |   5 +
 src/mesa/state_tracker/st_cb_flush.c  |   3 +
 src/mesa/state_tracker/st_context.c   |   1 +
 src/mesa/state_tracker/st_context.h   |   2 +
 6 files changed, 236 insertions(+), 12 deletions(-)

(limited to 'src/mesa/state_tracker/st_cb_bitmap.h')

diff --git a/src/mesa/state_tracker/st_atom.c b/src/mesa/state_tracker/st_atom.c
index 0e22a2fa6e..40e4142631 100644
--- a/src/mesa/state_tracker/st_atom.c
+++ b/src/mesa/state_tracker/st_atom.c
@@ -32,6 +32,7 @@
 #include "pipe/p_defines.h"
 #include "st_context.h"
 #include "st_atom.h"
+#include "st_cb_bitmap.h"
 #include "st_program.h"
 
        
@@ -147,6 +148,8 @@ void st_validate_state( struct st_context *st )
    struct st_state_flags *state = &st->dirty;
    GLuint i;
 
+   st_flush_bitmap_cache(st);
+
    check_program_state( st );
 
    if (state->st == 0)
diff --git a/src/mesa/state_tracker/st_cb_bitmap.c b/src/mesa/state_tracker/st_cb_bitmap.c
index 64b1882424..e46dcbf661 100644
--- a/src/mesa/state_tracker/st_cb_bitmap.c
+++ b/src/mesa/state_tracker/st_cb_bitmap.c
@@ -59,6 +59,31 @@
 
 
 
+/**
+ * The bitmap cache attempts to accumulate multiple glBitmap calls in a
+ * buffer which is then rendered en mass upon a flush, state change, etc.
+ * A wide, short buffer is used to target the common case of a series
+ * of glBitmap calls being used to draw text.
+ */
+static GLboolean UseBitmapCache = 0*GL_TRUE;
+
+
+#define BITMAP_CACHE_WIDTH  512
+#define BITMAP_CACHE_HEIGHT 32
+
+struct bitmap_cache
+{
+   /** An I8 texture image: */
+   GLubyte buffer[BITMAP_CACHE_HEIGHT][BITMAP_CACHE_WIDTH];
+   GLboolean empty;
+   /** Window pos to render the cached image */
+   GLint xpos, ypos;
+   struct pipe_texture *texture;
+};
+
+
+
+
 /**
  * Make fragment program for glBitmap:
  *   Sample the texture and kill the fragment if the bit is 0.
@@ -390,16 +415,18 @@ setup_bitmap_vertex_data(struct st_context *st,
 static void
 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
                  GLsizei width, GLsizei height,
-                 struct pipe_texture *pt,
-                 struct st_fragment_program *stfp)
+                 struct pipe_texture *pt)
 {
    struct st_context *st = ctx->st;
    struct pipe_context *pipe = ctx->st->pipe;
    struct cso_context *cso = ctx->st->cso_context;
+   struct st_fragment_program *stfp;
    GLuint maxSize;
 
+   stfp = combined_bitmap_fragment_program(ctx);
+
    /* limit checks */
-   /* XXX if DrawPixels image is larger than max texture size, break
+   /* XXX if the bitmap is larger than the max texture size, break
     * it up into chunks.
     */
    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
@@ -467,18 +494,185 @@ draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 
 
 
+static void
+init_bitmap_cache(struct st_context *st)
+{
+   struct pipe_context *pipe = st->pipe;
+   struct pipe_screen *screen = pipe->screen;
+   enum pipe_format format;
+
+   st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
+   if (!st->bitmap.cache)
+      return;
+
+   /* find a usable texture format */
+   if (screen->is_format_supported(screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE)) {
+      format = PIPE_FORMAT_U_I8;
+   }
+   else {
+      /* XXX support more formats */
+      assert(0);
+   }
+
+   st->bitmap.cache->texture
+      = st_texture_create(st, PIPE_TEXTURE_2D, format, 0,
+                          BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 1, 0);
+   if (!st->bitmap.cache->texture) {
+      FREE(st->bitmap.cache);
+      st->bitmap.cache = NULL;
+      return;
+   }
+
+   st->bitmap.cache->empty = GL_TRUE;
+}
+
+
+/**
+ * If there's anything in the bitmap cache, draw/flush it now.
+ */
+void
+st_flush_bitmap_cache(struct st_context *st)
+{
+   if (!st->bitmap.cache->empty) {
+      struct pipe_context *pipe = st->pipe;
+      struct pipe_screen *screen = pipe->screen;
+      struct pipe_surface *surf;
+      void *dest;
+
+      /* update the texture map image */
+      surf = screen->get_tex_surface(screen, st->bitmap.cache->texture, 0, 0, 0);
+      dest = pipe_surface_map(surf);
+      memcpy(dest, st->bitmap.cache->buffer, sizeof(st->bitmap.cache->buffer));
+      pipe_surface_unmap(surf);
+      pipe_surface_reference(&surf, NULL);
+
+      pipe->texture_update(pipe, st->bitmap.cache->texture, 0, 0x1);
+
+      draw_bitmap_quad(st->ctx,
+                       st->bitmap.cache->xpos,
+                       st->bitmap.cache->ypos,
+                       st->ctx->Current.RasterPos[2],
+                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
+                       st->bitmap.cache->texture);
+
+      memset(st->bitmap.cache->buffer, 0, sizeof(st->bitmap.cache->buffer));
+      st->bitmap.cache->empty = GL_TRUE;
+   }
+}
+
+
+/**
+ * Try to accumulate this glBitmap call in the bitmap cache.
+ * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
+ */
+static GLboolean
+accum_bitmap(struct st_context *st,
+             GLint x, GLint y, GLsizei width, GLsizei height,
+             const struct gl_pixelstore_attrib *unpack,
+             const GLubyte *bitmap )
+{
+   int row, col;
+   int px = -999, py;
+
+   if (width > BITMAP_CACHE_WIDTH ||
+       height > BITMAP_CACHE_HEIGHT)
+      return GL_FALSE; /* too big to cache */
+
+   if (!st->bitmap.cache->empty) {
+      px = x - st->bitmap.cache->xpos;  /* pos in buffer */
+      py = y - st->bitmap.cache->ypos;
+      if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
+          py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
+         /* This bitmap would extend beyond cache bounds,
+          * so flush and continue.
+          */
+         st_flush_bitmap_cache(st);
+      }
+   }
+
+   if (st->bitmap.cache->empty) {
+      /* Initialize.  Center bitmap vertically in the buffer. */
+      px = 0;
+      py = (BITMAP_CACHE_HEIGHT - height) / 2;
+      st->bitmap.cache->xpos = x;
+      st->bitmap.cache->ypos = y - py;
+      st->bitmap.cache->empty = GL_FALSE;
+   }
+
+   assert(px != -999);
+
+   /* XXX try to combine this code with code in make_bitmap_texture() */
+#define SET_PIXEL(COL, ROW) \
+   st->bitmap.cache->buffer[py + (ROW)][px + (COL)] = 0xff;
+
+   for (row = 0; row < height; row++) {
+      const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
+                 bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
+
+      if (unpack->LsbFirst) {
+         /* Lsb first */
+         GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
+         for (col = 0; col < width; col++) {
+
+            if (*src & mask) {
+               SET_PIXEL(col, row);
+            }
+
+            if (mask == 128U) {
+               src++;
+               mask = 1U;
+            }
+            else {
+               mask = mask << 1;
+            }
+         }
+
+         /* get ready for next row */
+         if (mask != 1)
+            src++;
+      }
+      else {
+         /* Msb first */
+         GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
+         for (col = 0; col < width; col++) {
+
+            if (*src & mask) {
+               SET_PIXEL(col, row);
+            }
+
+            if (mask == 1U) {
+               src++;
+               mask = 128U;
+            }
+            else {
+               mask = mask >> 1;
+            }
+         }
+
+         /* get ready for next row */
+         if (mask != 128)
+            src++;
+      }
+
+   } /* row */
+
+   return GL_TRUE; /* accumulated */
+}
+
+
+
+/**
+ * Called via ctx->Driver.Bitmap()
+ */
 static void
 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 {
-   struct st_fragment_program *stfp;
    struct st_context *st = ctx->st;
    struct pipe_texture *pt;
 
    st_validate_state(st);
 
-   stfp = combined_bitmap_fragment_program(ctx);
-
    if (!st->bitmap.vs) {
       /* create pass-through vertex shader now */
       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
@@ -491,26 +685,36 @@ st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
                                                           &st->bitmap.vert_shader);
    }
 
-   st_validate_state(st);
+   if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
+      return;
 
    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
    if (pt) {
       assert(pt->target == PIPE_TEXTURE_2D);
       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
-                       width, height,
-                       pt, stfp);
+                       width, height, pt);
       pipe_texture_reference(&pt, NULL);
    }
 }
 
 
-
-void st_init_bitmap_functions(struct dd_function_table *functions)
+/** Per-context init */
+void
+st_init_bitmap_functions(struct dd_function_table *functions)
 {
    functions->Bitmap = st_Bitmap;
 }
 
 
+/** Per-context init */
+void
+st_init_bitmap(struct st_context *st)
+{
+   init_bitmap_cache(st);
+}
+
+
+/** Per-context tear-down */
 void
 st_destroy_bitmap(struct st_context *st)
 {
@@ -528,9 +732,15 @@ st_destroy_bitmap(struct st_context *st)
       pipe->delete_vs_state(pipe, st->bitmap.vs);
       st->bitmap.vs = NULL;
    }
+
    if (st->bitmap.vbuf) {
       pipe->winsys->buffer_destroy(pipe->winsys, st->bitmap.vbuf);
       st->bitmap.vbuf = NULL;
    }
-}
 
+   if (st->bitmap.cache) {
+      pipe_texture_release(&st->bitmap.cache->texture);
+      FREE(st->bitmap.cache);
+      st->bitmap.cache = NULL;
+   }
+}
diff --git a/src/mesa/state_tracker/st_cb_bitmap.h b/src/mesa/state_tracker/st_cb_bitmap.h
index ac19e0ebb1..aae11d34c9 100644
--- a/src/mesa/state_tracker/st_cb_bitmap.h
+++ b/src/mesa/state_tracker/st_cb_bitmap.h
@@ -33,9 +33,14 @@
 extern void
 st_init_bitmap_functions(struct dd_function_table *functions);
 
+extern void
+st_init_bitmap(struct st_context *st);
 
 extern void
 st_destroy_bitmap(struct st_context *st);
 
+extern void
+st_flush_bitmap_cache(struct st_context *st);
+
 
 #endif /* ST_CB_BITMAP_H */
diff --git a/src/mesa/state_tracker/st_cb_flush.c b/src/mesa/state_tracker/st_cb_flush.c
index a536a059bd..e321b401e2 100644
--- a/src/mesa/state_tracker/st_cb_flush.c
+++ b/src/mesa/state_tracker/st_cb_flush.c
@@ -35,6 +35,7 @@
 #include "main/macros.h"
 #include "main/context.h"
 #include "st_context.h"
+#include "st_cb_bitmap.h"
 #include "st_cb_flush.h"
 #include "st_cb_fbo.h"
 #include "st_public.h"
@@ -48,6 +49,8 @@ void st_flush( struct st_context *st, uint pipeFlushFlags,
 {
    FLUSH_VERTICES(st->ctx, 0);
 
+   st_flush_bitmap_cache(st);
+
    st->pipe->flush( st->pipe, pipeFlushFlags, fence );
 }
 
diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index 726e06d7c2..a20195f2de 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -109,6 +109,7 @@ st_create_context_priv( GLcontext *ctx, struct pipe_context *pipe )
    st->cso_context = cso_create_context(pipe);
 
    st_init_atoms( st );
+   st_init_bitmap(st);
    st_init_draw( st );
    st_init_generate_mipmap(st);
    st_init_blit(st);
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index f235c194b7..85e3d47e1a 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -42,6 +42,7 @@ struct cso_cache;
 struct cso_blend;
 struct gen_mipmap_state;
 struct blit_state;
+struct bitmap_cache;
 
 
 #define ST_NEW_MESA                    0x1 /* Mesa state has changed */
@@ -151,6 +152,7 @@ struct st_context
       void *vs;
       float vertices[4][3][4];  /**< vertex pos + color + texcoord */
       struct pipe_buffer *vbuf;
+      struct bitmap_cache *cache;
    } bitmap;
 
    /** for glClear */
-- 
cgit v1.2.3


From d2c2e9316d043ab584794a3524f22776deb4c777 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Fri, 12 Dec 2008 16:46:34 +0000
Subject: gallium: avoid mapping same vertex buffer in subsequent frames

Quite a few util modules were maintaining a single vertex buffer over multiple
frames, and potentially reusing it in subsequent frames.  Unfortunately that
would force us into syncrhonous rendering as the buffer manager would be
forced to wait for the previous rendering to complete prior to allowing the
map.

This resolves that issue, but requires the state tracker to issue a few new
flush() calls at the end of each frame.
---
 src/gallium/auxiliary/util/u_blit.c       | 88 ++++++++++++++++++++++---------
 src/gallium/auxiliary/util/u_blit.h       |  4 ++
 src/gallium/auxiliary/util/u_draw_quad.c  |  5 +-
 src/gallium/auxiliary/util/u_draw_quad.h  |  2 +-
 src/gallium/auxiliary/util/u_gen_mipmap.c | 51 +++++++++++++++---
 src/gallium/auxiliary/util/u_gen_mipmap.h |  5 ++
 src/mesa/state_tracker/st_cb_accum.c      |  3 +-
 src/mesa/state_tracker/st_cb_bitmap.c     | 60 +++++++++++++++------
 src/mesa/state_tracker/st_cb_bitmap.h     |  6 +++
 src/mesa/state_tracker/st_cb_clear.c      | 31 +++++++++--
 src/mesa/state_tracker/st_cb_clear.h      |  3 ++
 src/mesa/state_tracker/st_cb_drawpixels.c |  2 +-
 src/mesa/state_tracker/st_cb_fbo.c        |  2 +-
 src/mesa/state_tracker/st_cb_flush.c      | 11 +++-
 src/mesa/state_tracker/st_cb_readpixels.c |  4 +-
 src/mesa/state_tracker/st_context.h       |  2 +
 16 files changed, 219 insertions(+), 60 deletions(-)

(limited to 'src/mesa/state_tracker/st_cb_bitmap.h')

diff --git a/src/gallium/auxiliary/util/u_blit.c b/src/gallium/auxiliary/util/u_blit.c
index d28201ac8d..2cef3338b5 100644
--- a/src/gallium/auxiliary/util/u_blit.c
+++ b/src/gallium/auxiliary/util/u_blit.c
@@ -66,6 +66,8 @@ struct blit_state
    void *fs;
 
    struct pipe_buffer *vbuf;  /**< quad vertices */
+   unsigned vbuf_slot;
+
    float vertices[4][2][4];   /**< vertex/texcoords for quad */
 };
 
@@ -138,17 +140,7 @@ util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
 
    /* fragment shader */
    ctx->fs = util_make_fragment_tex_shader(pipe, &ctx->frag_shader);
-
-   ctx->vbuf = pipe_buffer_create(pipe->screen,
-                                  32,
-                                  PIPE_BUFFER_USAGE_VERTEX,
-                                  sizeof(ctx->vertices));
-   if (!ctx->vbuf) {
-      FREE(ctx);
-      ctx->pipe->delete_fs_state(ctx->pipe, ctx->fs);
-      ctx->pipe->delete_vs_state(ctx->pipe, ctx->vs);
-      return NULL;
-   }
+   ctx->vbuf = NULL;
 
    /* init vertex data that doesn't change */
    for (i = 0; i < 4; i++) {
@@ -181,15 +173,35 @@ util_destroy_blit(struct blit_state *ctx)
 }
 
 
+static unsigned get_next_slot( struct blit_state *ctx )
+{
+   const unsigned max_slots = 4096 / sizeof ctx->vertices;
+
+   if (ctx->vbuf_slot >= max_slots) 
+      util_blit_flush( ctx );
+
+   if (!ctx->vbuf) {
+      ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
+                                     32,
+                                     PIPE_BUFFER_USAGE_VERTEX,
+                                     max_slots * sizeof ctx->vertices);
+   }
+   
+   return ctx->vbuf_slot++ * sizeof ctx->vertices;
+}
+                               
+
+
 /**
  * Setup vertex data for the textured quad we'll draw.
  * Note: y=0=top
  */
-static void
+static unsigned
 setup_vertex_data(struct blit_state *ctx,
                   float x0, float y0, float x1, float y1, float z)
 {
    void *buf;
+   unsigned offset;
 
    ctx->vertices[0][0][0] = x0;
    ctx->vertices[0][0][1] = y0;
@@ -215,12 +227,16 @@ setup_vertex_data(struct blit_state *ctx,
    ctx->vertices[3][1][0] = 0.0f;
    ctx->vertices[3][1][1] = 1.0f;
 
+   offset = get_next_slot( ctx );
+
    buf = pipe_buffer_map(ctx->pipe->screen, ctx->vbuf,
                          PIPE_BUFFER_USAGE_CPU_WRITE);
 
-   memcpy(buf, ctx->vertices, sizeof(ctx->vertices));
+   memcpy((char *)buf + offset, ctx->vertices, sizeof(ctx->vertices));
 
    pipe_buffer_unmap(ctx->pipe->screen, ctx->vbuf);
+
+   return offset;
 }
 
 
@@ -228,13 +244,14 @@ setup_vertex_data(struct blit_state *ctx,
  * Setup vertex data for the textured quad we'll draw.
  * Note: y=0=top
  */
-static void
+static unsigned
 setup_vertex_data_tex(struct blit_state *ctx,
                       float x0, float y0, float x1, float y1,
                       float s0, float t0, float s1, float t1,
                       float z)
 {
    void *buf;
+   unsigned offset;
 
    ctx->vertices[0][0][0] = x0;
    ctx->vertices[0][0][1] = y0;
@@ -260,12 +277,16 @@ setup_vertex_data_tex(struct blit_state *ctx,
    ctx->vertices[3][1][0] = s0;
    ctx->vertices[3][1][1] = t1;
 
+   offset = get_next_slot( ctx );
+
    buf = pipe_buffer_map(ctx->pipe->screen, ctx->vbuf,
                          PIPE_BUFFER_USAGE_CPU_WRITE);
 
-   memcpy(buf, ctx->vertices, sizeof(ctx->vertices));
+   memcpy((char *)buf + offset, ctx->vertices, sizeof(ctx->vertices));
 
    pipe_buffer_unmap(ctx->pipe->screen, ctx->vbuf);
+
+   return offset;
 }
 /**
  * Copy pixel block from src surface to dst surface.
@@ -291,6 +312,7 @@ util_blit_pixels(struct blit_state *ctx,
    const int srcH = abs(srcY1 - srcY0);
    const int srcLeft = MIN2(srcX0, srcX1);
    const int srcTop = MIN2(srcY0, srcY1);
+   unsigned offset;
 
    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
           filter == PIPE_TEX_MIPFILTER_LINEAR);
@@ -398,11 +420,11 @@ util_blit_pixels(struct blit_state *ctx,
    cso_set_framebuffer(ctx->cso, &fb);
 
    /* draw quad */
-   setup_vertex_data(ctx,
-                     (float) dstX0, (float) dstY0, 
-                     (float) dstX1, (float) dstY1, z);
+   offset = setup_vertex_data(ctx,
+                              (float) dstX0, (float) dstY0, 
+                              (float) dstX1, (float) dstY1, z);
 
-   util_draw_vertex_buffer(ctx->pipe, ctx->vbuf,
+   util_draw_vertex_buffer(ctx->pipe, ctx->vbuf, offset,
                            PIPE_PRIM_TRIANGLE_FAN,
                            4,  /* verts */
                            2); /* attribs/vert */
@@ -421,6 +443,18 @@ util_blit_pixels(struct blit_state *ctx,
    screen->texture_release(screen, &tex);
 }
 
+
+/* Release vertex buffer at end of frame to avoid synchronous
+ * rendering.
+ */
+void util_blit_flush( struct blit_state *ctx )
+{
+   pipe_buffer_reference(ctx->pipe->screen, &ctx->vbuf, NULL);
+   ctx->vbuf_slot = 0;
+} 
+
+
+
 /**
  * Copy pixel block from src texture to dst surface.
  * Overlapping regions are acceptable.
@@ -442,6 +476,7 @@ util_blit_pixels_tex(struct blit_state *ctx,
    struct pipe_screen *screen = pipe->screen;
    struct pipe_framebuffer_state fb;
    float s0, t0, s1, t1;
+   unsigned offset;
 
    assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
           filter == PIPE_TEX_MIPFILTER_LINEAR);
@@ -496,13 +531,14 @@ util_blit_pixels_tex(struct blit_state *ctx,
    cso_set_framebuffer(ctx->cso, &fb);
 
    /* draw quad */
-   setup_vertex_data_tex(ctx,
-                     (float) dstX0, (float) dstY0,
-                     (float) dstX1, (float) dstY1,
-                     s0, t0, s1, t1,
-                     z);
-
-   util_draw_vertex_buffer(ctx->pipe, ctx->vbuf,
+   offset = setup_vertex_data_tex(ctx,
+                                  (float) dstX0, (float) dstY0,
+                                  (float) dstX1, (float) dstY1,
+                                  s0, t0, s1, t1,
+                                  z);
+
+   util_draw_vertex_buffer(ctx->pipe, 
+                           ctx->vbuf, offset,
                            PIPE_PRIM_TRIANGLE_FAN,
                            4,  /* verts */
                            2); /* attribs/vert */
diff --git a/src/gallium/auxiliary/util/u_blit.h b/src/gallium/auxiliary/util/u_blit.h
index 308075698f..c35beceda8 100644
--- a/src/gallium/auxiliary/util/u_blit.h
+++ b/src/gallium/auxiliary/util/u_blit.h
@@ -70,6 +70,10 @@ util_blit_pixels_tex(struct blit_state *ctx,
                      int dstX1, int dstY1,
                      float z, uint filter);
 
+/* Call at end of frame to avoid synchronous rendering.
+ */
+extern void
+util_blit_flush( struct blit_state *ctx );
 
 #ifdef __cplusplus
 }
diff --git a/src/gallium/auxiliary/util/u_draw_quad.c b/src/gallium/auxiliary/util/u_draw_quad.c
index 8ecae71b64..d7bb74b87b 100644
--- a/src/gallium/auxiliary/util/u_draw_quad.c
+++ b/src/gallium/auxiliary/util/u_draw_quad.c
@@ -40,6 +40,7 @@
 void 
 util_draw_vertex_buffer(struct pipe_context *pipe,
                         struct pipe_buffer *vbuf,
+                        uint offset,
                         uint prim_type,
                         uint num_verts,
                         uint num_attribs)
@@ -53,7 +54,7 @@ util_draw_vertex_buffer(struct pipe_context *pipe,
    /* tell pipe about the vertex buffer */
    vbuffer.buffer = vbuf;
    vbuffer.pitch = num_attribs * 4 * sizeof(float);  /* vertex size */
-   vbuffer.buffer_offset = 0;
+   vbuffer.buffer_offset = offset;
    pipe->set_vertex_buffers(pipe, 1, &vbuffer);
 
    /* tell pipe about the vertex attributes */
@@ -124,7 +125,7 @@ util_draw_texquad(struct pipe_context *pipe,
          v[29] = 1.0;
 
          pipe_buffer_unmap(pipe->screen, vbuf);
-         util_draw_vertex_buffer(pipe, vbuf, PIPE_PRIM_TRIANGLE_FAN, 4, 2);
+         util_draw_vertex_buffer(pipe, vbuf, 0, PIPE_PRIM_TRIANGLE_FAN, 4, 2);
       }
 
       pipe_buffer_reference(pipe->screen, &vbuf, NULL);
diff --git a/src/gallium/auxiliary/util/u_draw_quad.h b/src/gallium/auxiliary/util/u_draw_quad.h
index ec4862ead3..00d3f5b715 100644
--- a/src/gallium/auxiliary/util/u_draw_quad.h
+++ b/src/gallium/auxiliary/util/u_draw_quad.h
@@ -37,7 +37,7 @@ struct pipe_buffer;
 
 extern void 
 util_draw_vertex_buffer(struct pipe_context *pipe,
-                        struct pipe_buffer *vbuf,
+                        struct pipe_buffer *vbuf, uint offset,
                         uint num_attribs, uint num_verts, uint prim_type);
 
 
diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.c b/src/gallium/auxiliary/util/u_gen_mipmap.c
index 9d305ad763..5f395ec6e9 100644
--- a/src/gallium/auxiliary/util/u_gen_mipmap.c
+++ b/src/gallium/auxiliary/util/u_gen_mipmap.c
@@ -69,6 +69,8 @@ struct gen_mipmap_state
    void *fs;
 
    struct pipe_buffer *vbuf;  /**< quad vertices */
+   unsigned vbuf_slot;
+
    float vertices[4][2][4];   /**< vertex/texcoords for quad */
 };
 
@@ -779,10 +781,28 @@ util_create_gen_mipmap(struct pipe_context *pipe,
 }
 
 
-static void
+static unsigned get_next_slot( struct gen_mipmap_state *ctx )
+{
+   const unsigned max_slots = 4096 / sizeof ctx->vertices;
+
+   if (ctx->vbuf_slot >= max_slots) 
+      util_gen_mipmap_flush( ctx );
+
+   if (!ctx->vbuf) {
+      ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
+                                     32,
+                                     PIPE_BUFFER_USAGE_VERTEX,
+                                     max_slots * sizeof ctx->vertices);
+   }
+   
+   return ctx->vbuf_slot++ * sizeof ctx->vertices;
+}
+
+static unsigned
 set_vertex_data(struct gen_mipmap_state *ctx, float width, float height)
 {
    void *buf;
+   unsigned offset;
 
    ctx->vertices[0][0][0] = 0.0f; /*x*/
    ctx->vertices[0][0][1] = 0.0f; /*y*/
@@ -804,12 +824,16 @@ set_vertex_data(struct gen_mipmap_state *ctx, float width, float height)
    ctx->vertices[3][1][0] = 0.0f;
    ctx->vertices[3][1][1] = 1.0f;
 
+   offset = get_next_slot( ctx );
+
    buf = pipe_buffer_map(ctx->pipe->screen, ctx->vbuf,
                          PIPE_BUFFER_USAGE_CPU_WRITE);
 
-   memcpy(buf, ctx->vertices, sizeof(ctx->vertices));
+   memcpy((char *)buf + offset, ctx->vertices, sizeof(ctx->vertices));
 
    pipe_buffer_unmap(ctx->pipe->screen, ctx->vbuf);
+
+   return offset;
 }
 
 
@@ -834,6 +858,17 @@ util_destroy_gen_mipmap(struct gen_mipmap_state *ctx)
 }
 
 
+
+/* Release vertex buffer at end of frame to avoid synchronous
+ * rendering.
+ */
+void util_gen_mipmap_flush( struct gen_mipmap_state *ctx )
+{
+   pipe_buffer_reference(ctx->pipe->screen, &ctx->vbuf, NULL);
+   ctx->vbuf_slot = 0;
+} 
+
+
 /**
  * Generate mipmap images.  It's assumed all needed texture memory is
  * already allocated.
@@ -855,6 +890,7 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
    struct pipe_framebuffer_state fb;
    uint dstLevel;
    uint zslice = 0;
+   uint offset;
 
    /* check if we can render in the texture's format */
    if (!screen->is_format_supported(screen, pt->format, PIPE_TEXTURE_2D,
@@ -925,10 +961,13 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
       cso_set_sampler_textures(ctx->cso, 1, &pt);
 
       /* quad coords in window coords (bypassing clipping, viewport mapping) */
-      set_vertex_data(ctx,
-                      (float) pt->width[dstLevel],
-                      (float) pt->height[dstLevel]);
-      util_draw_vertex_buffer(ctx->pipe, ctx->vbuf,
+      offset = set_vertex_data(ctx,
+                               (float) pt->width[dstLevel],
+                               (float) pt->height[dstLevel]);
+
+      util_draw_vertex_buffer(ctx->pipe, 
+                              ctx->vbuf,
+                              offset,
                               PIPE_PRIM_TRIANGLE_FAN,
                               4,  /* verts */
                               2); /* attribs/vert */
diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.h b/src/gallium/auxiliary/util/u_gen_mipmap.h
index 3277024f07..54608f9466 100644
--- a/src/gallium/auxiliary/util/u_gen_mipmap.h
+++ b/src/gallium/auxiliary/util/u_gen_mipmap.h
@@ -50,6 +50,11 @@ util_create_gen_mipmap(struct pipe_context *pipe, struct cso_context *cso);
 extern void
 util_destroy_gen_mipmap(struct gen_mipmap_state *ctx);
 
+/* Release vertex buffer at end of frame to avoid synchronous
+ * rendering.
+ */
+extern void 
+util_gen_mipmap_flush( struct gen_mipmap_state *ctx );
 
 
 extern void
diff --git a/src/mesa/state_tracker/st_cb_accum.c b/src/mesa/state_tracker/st_cb_accum.c
index cf3a99e7e9..a4e72b48ed 100644
--- a/src/mesa/state_tracker/st_cb_accum.c
+++ b/src/mesa/state_tracker/st_cb_accum.c
@@ -38,6 +38,7 @@
 #include "st_cb_accum.h"
 #include "st_cb_fbo.h"
 #include "st_draw.h"
+#include "st_public.h"
 #include "st_format.h"
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
@@ -324,7 +325,7 @@ st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 
    /* make sure color bufs aren't cached */
-   pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+   st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 
    switch (op) {
    case GL_ADD:
diff --git a/src/mesa/state_tracker/st_cb_bitmap.c b/src/mesa/state_tracker/st_cb_bitmap.c
index 73645201cc..bc05ca6a2f 100644
--- a/src/mesa/state_tracker/st_cb_bitmap.c
+++ b/src/mesa/state_tracker/st_cb_bitmap.c
@@ -349,8 +349,7 @@ make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
    return pt;
 }
 
-
-static void
+static GLuint
 setup_bitmap_vertex_data(struct st_context *st,
                          int x, int y, int width, int height,
                          float z, const float color[4])
@@ -369,12 +368,18 @@ setup_bitmap_vertex_data(struct st_context *st,
    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
+   const GLuint max_slots = 4096 / sizeof(st->bitmap.vertices);
    GLuint i;
-   void *buf;
+
+   if (st->bitmap.vbuf_slot >= max_slots) {
+      pipe_buffer_reference(pipe->screen, &st->bitmap.vbuf, NULL);
+      st->bitmap.vbuf_slot = 0;
+   }
 
    if (!st->bitmap.vbuf) {
-      st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
-                                           sizeof(st->bitmap.vertices));
+      st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32, 
+                                           PIPE_BUFFER_USAGE_VERTEX,
+                                           max_slots * sizeof(st->bitmap.vertices));
    }
 
    /* Positions are in clip coords since we need to do clipping in case
@@ -413,9 +418,19 @@ setup_bitmap_vertex_data(struct st_context *st,
    }
 
    /* put vertex data into vbuf */
-   buf = pipe_buffer_map(pipe->screen, st->bitmap.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);
-   memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
-   pipe_buffer_unmap(pipe->screen, st->bitmap.vbuf);
+   {
+      char *buf = pipe_buffer_map(pipe->screen, 
+                                  st->bitmap.vbuf, 
+                                  PIPE_BUFFER_USAGE_CPU_WRITE);
+
+      memcpy(buf + st->bitmap.vbuf_slot * sizeof st->bitmap.vertices, 
+             st->bitmap.vertices, 
+             sizeof st->bitmap.vertices);
+
+      pipe_buffer_unmap(pipe->screen, st->bitmap.vbuf);
+   }
+
+   return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 }
 
 
@@ -434,6 +449,7 @@ draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
    struct cso_context *cso = ctx->st->cso_context;
    struct st_fragment_program *stfp;
    GLuint maxSize;
+   GLuint offset;
 
    stfp = combined_bitmap_fragment_program(ctx);
 
@@ -518,11 +534,11 @@ draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
    }
 
    /* draw textured quad */
-   setup_bitmap_vertex_data(st, x, y, width, height,
-                            ctx->Current.RasterPos[2],
-                            color);
+   offset = setup_bitmap_vertex_data(st, x, y, width, height,
+                                     ctx->Current.RasterPos[2],
+                                     color);
 
-   util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
+   util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
                            PIPE_PRIM_TRIANGLE_FAN,
                            4,  /* verts */
                            3); /* attribs/vert */
@@ -592,12 +608,12 @@ st_flush_bitmap_cache(struct st_context *st)
          struct pipe_screen *screen = pipe->screen;
 
          assert(cache->xmin <= cache->xmax);
-         /*
-         printf("flush size %d x %d  at %d, %d\n",
+ 
+/*         printf("flush size %d x %d  at %d, %d\n",
                 cache->xmax - cache->xmin,
                 cache->ymax - cache->ymin,
                 cache->xpos, cache->ypos);
-         */
+*/
 
          /* The texture surface has been mapped until now.
           * So unmap and release the texture surface before drawing.
@@ -623,6 +639,20 @@ st_flush_bitmap_cache(struct st_context *st)
    }
 }
 
+/* Flush bitmap cache and release vertex buffer.
+ */
+void
+st_flush_bitmap( struct st_context *st )
+{
+   st_flush_bitmap_cache(st);
+
+   /* Release vertex buffer to avoid synchronous rendering if we were
+    * to map it in the next frame.
+    */
+   pipe_buffer_reference(st->pipe->screen, &st->bitmap.vbuf, NULL);
+   st->bitmap.vbuf_slot = 0;
+}
+
 
 /**
  * Try to accumulate this glBitmap call in the bitmap cache.
diff --git a/src/mesa/state_tracker/st_cb_bitmap.h b/src/mesa/state_tracker/st_cb_bitmap.h
index aae11d34c9..81cf61981d 100644
--- a/src/mesa/state_tracker/st_cb_bitmap.h
+++ b/src/mesa/state_tracker/st_cb_bitmap.h
@@ -42,5 +42,11 @@ st_destroy_bitmap(struct st_context *st);
 extern void
 st_flush_bitmap_cache(struct st_context *st);
 
+/* Flush bitmap cache and release vertex buffer.  Needed at end of
+ * frame to avoid synchronous rendering.
+ */
+extern void
+st_flush_bitmap(struct st_context *st);
+
 
 #endif /* ST_CB_BITMAP_H */
diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
index bc3055c3fd..b6cea16163 100644
--- a/src/mesa/state_tracker/st_cb_clear.c
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -148,12 +148,18 @@ draw_quad(GLcontext *ctx,
 {
    struct st_context *st = ctx->st;
    struct pipe_context *pipe = st->pipe;
+   const GLuint max_slots = 1024 / sizeof(st->clear.vertices);
    GLuint i;
    void *buf;
 
+   if (st->clear.vbuf_slot >= max_slots) {
+      pipe_buffer_reference(pipe->screen, &st->clear.vbuf, NULL);
+      st->clear.vbuf_slot = 0;
+   }
+
    if (!st->clear.vbuf) {
       st->clear.vbuf = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
-                                          sizeof(st->clear.vertices));
+                                          max_slots * sizeof(st->clear.vertices));
    }
 
    /* positions */
@@ -181,14 +187,23 @@ draw_quad(GLcontext *ctx,
 
    /* put vertex data into vbuf */
    buf = pipe_buffer_map(pipe->screen, st->clear.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);
-   memcpy(buf, st->clear.vertices, sizeof(st->clear.vertices));
+
+   memcpy((char *)buf + st->clear.vbuf_slot * sizeof(st->clear.vertices), 
+          st->clear.vertices, 
+          sizeof(st->clear.vertices));
+
    pipe_buffer_unmap(pipe->screen, st->clear.vbuf);
 
    /* draw */
-   util_draw_vertex_buffer(pipe, st->clear.vbuf,
+   util_draw_vertex_buffer(pipe, 
+                           st->clear.vbuf, 
+                           st->clear.vbuf_slot * sizeof(st->clear.vertices),
                            PIPE_PRIM_TRIANGLE_FAN,
                            4,  /* verts */
                            2); /* attribs/vert */
+
+   /* Increment slot */
+   st->clear.vbuf_slot++;
 }
 
 
@@ -508,6 +523,16 @@ clear_depth_stencil_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
 }
 
 
+void st_flush_clear( struct st_context *st )
+{
+   /* Release vertex buffer to avoid synchronous rendering if we were
+    * to map it in the next frame.
+    */
+   pipe_buffer_reference(st->pipe->screen, &st->clear.vbuf, NULL);
+   st->clear.vbuf_slot = 0;
+}
+ 
+
 
 /**
  * Called via ctx->Driver.Clear()
diff --git a/src/mesa/state_tracker/st_cb_clear.h b/src/mesa/state_tracker/st_cb_clear.h
index f49387747d..bc035ac25c 100644
--- a/src/mesa/state_tracker/st_cb_clear.h
+++ b/src/mesa/state_tracker/st_cb_clear.h
@@ -37,6 +37,9 @@ st_init_clear(struct st_context *st);
 extern void
 st_destroy_clear(struct st_context *st);
 
+extern void
+st_flush_clear(struct st_context *st);
+
 
 extern void
 st_init_clear_functions(struct dd_function_table *functions);
diff --git a/src/mesa/state_tracker/st_cb_drawpixels.c b/src/mesa/state_tracker/st_cb_drawpixels.c
index 5b24b9f068..32bf21411d 100644
--- a/src/mesa/state_tracker/st_cb_drawpixels.c
+++ b/src/mesa/state_tracker/st_cb_drawpixels.c
@@ -494,7 +494,7 @@ draw_quad(GLcontext *ctx, GLfloat x0, GLfloat y0, GLfloat z,
       memcpy(map, verts, sizeof(verts));
       pipe_buffer_unmap(pipe->screen, buf);
 
-      util_draw_vertex_buffer(pipe, buf,
+      util_draw_vertex_buffer(pipe, buf, 0,
                               PIPE_PRIM_QUADS,
                               4,  /* verts */
                               3); /* attribs/vert */
diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index 00076f61e0..eece7dee11 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -426,7 +426,7 @@ st_finish_render_texture(GLcontext *ctx,
    if (!strb)
       return;
 
-   ctx->st->pipe->flush(ctx->st->pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+   st_flush( ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL );
 
    if (strb->surface)
       screen->tex_surface_release( screen, &strb->surface );
diff --git a/src/mesa/state_tracker/st_cb_flush.c b/src/mesa/state_tracker/st_cb_flush.c
index cc40467941..072f2e92ad 100644
--- a/src/mesa/state_tracker/st_cb_flush.c
+++ b/src/mesa/state_tracker/st_cb_flush.c
@@ -37,11 +37,14 @@
 #include "st_context.h"
 #include "st_cb_bitmap.h"
 #include "st_cb_flush.h"
+#include "st_cb_clear.h"
 #include "st_cb_fbo.h"
 #include "st_public.h"
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_winsys.h"
+#include "util/u_gen_mipmap.h"
+#include "util/u_blit.h"
 
 
 static INLINE GLboolean
@@ -78,7 +81,13 @@ void st_flush( struct st_context *st, uint pipeFlushFlags,
 {
    FLUSH_VERTICES(st->ctx, 0);
 
-   st_flush_bitmap_cache(st);
+   /* Release any vertex buffers that might potentially be accessed in
+    * successive frames:
+    */
+   st_flush_bitmap(st);
+   st_flush_clear(st);
+   util_blit_flush(st->blit);
+   util_gen_mipmap_flush(st->gen_mipmap);
 
    st->pipe->flush( st->pipe, pipeFlushFlags, fence );
 }
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c
index c801532788..646eaff190 100644
--- a/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/src/mesa/state_tracker/st_cb_readpixels.c
@@ -317,10 +317,8 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
    if (!dest)
       return;
 
-   st_flush_bitmap_cache(ctx->st);
-
    /* make sure rendering has completed */
-   pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+   st_flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 
    if (format == GL_STENCIL_INDEX) {
       st_read_stencil_pixels(ctx, x, y, width, height, type, pack, dest);
diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index 5bcb87ce20..695ac4a96f 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -154,6 +154,7 @@ struct st_context
       void *vs;
       float vertices[4][3][4];  /**< vertex pos + color + texcoord */
       struct pipe_buffer *vbuf;
+      unsigned vbuf_slot;       /* next free slot in vbuf */
       struct bitmap_cache *cache;
    } bitmap;
 
@@ -173,6 +174,7 @@ struct st_context
       void *fs;
       float vertices[4][2][4];  /**< vertex pos + color */
       struct pipe_buffer *vbuf;
+      unsigned vbuf_slot;
    } clear;
 
    void *passthrough_fs;  /**< simple pass-through frag shader */
-- 
cgit v1.2.3