Implementation of GL_EXT_pixel_buffer_object extension.

Note: extension may not be finalized yet - subject to change!
Note: implementation not fully suitable for h/w implementation yet.

1 files changed, 29 insertions, 1 deletions

diff --git a/src/mesa/main/pixel.c b/src/mesa/main/pixel.c
index 6800170faa..8e2b55fc34 100644
--- a/src/mesa/main/pixel.c
+++ b/src/mesa/main/pixel.c
@@ -24,6 +24,7 @@
 
 #include "glheader.h"
 #include "imports.h"
+#include "image.h"
 #include "colormac.h"
 #include "context.h"
 #include "macros.h"
@@ -1682,7 +1683,8 @@ void _mesa_update_pixel( GLcontext *ctx, GLuint new_state )
 /*****                      Initialization                        *****/
 /**********************************************************************/
 
-void _mesa_init_pixel( GLcontext * ctx )
+void
+_mesa_init_pixel( GLcontext * ctx )
 {
    int i;
 
@@ -1774,6 +1776,9 @@ void _mesa_init_pixel( GLcontext * ctx )
    ctx->Pack.LsbFirst = GL_FALSE;
    ctx->Pack.ClientStorage = GL_FALSE;
    ctx->Pack.Invert = GL_FALSE;
+#if FEATURE_EXT_pixel_buffer_object
+   ctx->Pack.BufferObj = ctx->Array.NullBufferObj;
+#endif
    ctx->Unpack.Alignment = 4;
    ctx->Unpack.RowLength = 0;
    ctx->Unpack.ImageHeight = 0;
@@ -1784,6 +1789,29 @@ void _mesa_init_pixel( GLcontext * ctx )
    ctx->Unpack.LsbFirst = GL_FALSE;
    ctx->Unpack.ClientStorage = GL_FALSE;
    ctx->Unpack.Invert = GL_FALSE;
+#if FEATURE_EXT_pixel_buffer_object
+   ctx->Unpack.BufferObj = ctx->Array.NullBufferObj;
+#endif
+
+   /*
+    * _mesa_unpack_image() returns image data in this format.  When we
+    * execute image commands (glDrawPixels(), glTexImage(), etc) from
+    * within display lists we have to be sure to set the current
+    * unpacking parameters to these values!
+    */
+   ctx->DefaultPacking.Alignment = 1;
+   ctx->DefaultPacking.RowLength = 0;
+   ctx->DefaultPacking.SkipPixels = 0;
+   ctx->DefaultPacking.SkipRows = 0;
+   ctx->DefaultPacking.ImageHeight = 0;
+   ctx->DefaultPacking.SkipImages = 0;
+   ctx->DefaultPacking.SwapBytes = GL_FALSE;
+   ctx->DefaultPacking.LsbFirst = GL_FALSE;
+   ctx->DefaultPacking.ClientStorage = GL_FALSE;
+   ctx->DefaultPacking.Invert = GL_FALSE;
+#if FEATURE_EXT_pixel_buffer_object
+   ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
+#endif
 
    if (ctx->Visual.doubleBufferMode) {
       ctx->Pixel.ReadBuffer = GL_BACK;