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-rw-r--r--src/mesa/main/bufferobj.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 3e011ef5b2..a49da3d3b5 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -39,6 +39,11 @@
#include "bufferobj.h"
+/* Debug flags */
+/*#define VBO_DEBUG*/
+/*#define BOUNDS_CHECK*/
+
+
#ifdef FEATURE_OES_mapbuffer
#define DEFAULT_ACCESS GL_WRITE_ONLY;
#else
@@ -1019,6 +1024,9 @@ _mesa_BufferDataARB(GLenum target, GLsizeiptrARB size,
bufObj->Name, size, data, usage);
#endif
+#ifdef BOUNDS_CHECK
+ size += 100;
+#endif
/* Give the buffer object to the driver! <data> may be null! */
ctx->Driver.BufferData( ctx, target, size, data, usage, bufObj );
}
@@ -1119,6 +1127,17 @@ _mesa_MapBufferARB(GLenum target, GLenum access)
}
#endif
+#ifdef BOUNDS_CHECK
+ {
+ GLubyte *buf = (GLubyte *) bufObj->Pointer;
+ GLuint i;
+ /* buffer is 100 bytes larger than requested, fill with magic value */
+ for (i = 0; i < 100; i++) {
+ buf[bufObj->Size - i - 1] = 123;
+ }
+ }
+#endif
+
return bufObj->Pointer;
}
@@ -1145,6 +1164,22 @@ _mesa_UnmapBufferARB(GLenum target)
return GL_FALSE;
}
+#ifdef BOUNDS_CHECK
+ if (bufObj->Access != GL_READ_ONLY_ARB) {
+ GLubyte *buf = (GLubyte *) bufObj->Pointer;
+ GLuint i;
+ /* check that last 100 bytes are still = magic value */
+ for (i = 0; i < 100; i++) {
+ GLuint pos = bufObj->Size - i - 1;
+ if (buf[pos] != 123) {
+ _mesa_warning(ctx, "Out of bounds buffer object write detected"
+ " at position %d (value = %u)\n",
+ pos, buf[pos]);
+ }
+ }
+ }
+#endif
+
#ifdef VBO_DEBUG
if (bufObj->Access == GL_WRITE_ONLY_ARB) {
GLuint i, unchanged = 0;