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, 23 insertions, 0 deletions

diff --git a/src/mesa/swrast/s_context.c b/src/mesa/swrast/s_context.c
index 0a81048e6f5..be800d4d594 100644
--- a/src/mesa/swrast/s_context.c
+++ b/src/mesa/swrast/s_context.c
@@ -27,6 +27,7 @@
  */
 
 #include "imports.h"
+#include "bufferobj.h"
 #include "context.h"
 #include "colormac.h"
 #include "mtypes.h"
@@ -731,3 +732,25 @@ _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
       _mesa_debug(ctx, "\n");
    }
 }
+
+
+/**
+ * Validate access to a PBO to be sure we're not going to read/write
+ * out of buffer bounds.
+ */
+GLvoid *
+_swrast_validate_pbo_access(const struct gl_pixelstore_attrib *pack,
+                            GLsizei width, GLsizei height, GLsizei depth,
+                            GLenum format, GLenum type, GLvoid *ptr)
+{
+   if (pack->BufferObj->Name == 0) {
+      /* no PBO */
+      return ptr;
+   }
+   else if (_mesa_validate_pbo_access(pack, width, height, depth, format,
+                                      type, ptr)) {
+      return ADD_POINTERS(pack->BufferObj->Data, ptr);
+   }
+   /* bad access! */
+   return NULL;
+}