Mesa (master): mesa: added assertion, another comment
Brian Paul
brianp at kemper.freedesktop.org
Tue Nov 3 16:53:23 UTC 2009
Module: Mesa
Branch: master
Commit: 2d11c48223adb78353ca32f0cc07941957310389
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=2d11c48223adb78353ca32f0cc07941957310389
Author: Brian Paul <brianp at vmware.com>
Date: Mon Nov 2 12:58:51 2009 -0700
mesa: added assertion, another comment
---
src/mesa/main/buffers.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index d8b5f3b..b5acda8 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -344,7 +344,7 @@ _mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers)
/**
* Helper function to set the GL_DRAW_BUFFER state in the context and
- * current FBO.
+ * current FBO. Called via glDrawBuffer(), glDrawBuffersARB()
*
* All error checking will have been done prior to calling this function
* so nothing should go wrong at this point.
@@ -392,6 +392,8 @@ _mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
GLuint buf, count = 0;
for (buf = 0; buf < n; buf++ ) {
if (destMask[buf]) {
+ /* only one bit should be set in the destMask[buf] field */
+ ASSERT(_mesa_bitcount(destMask[buf]) == 1);
fb->_ColorDrawBufferIndexes[buf] = _mesa_ffs(destMask[buf]) - 1;
fb->ColorDrawBuffer[buf] = buffers[buf];
count = buf + 1;
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