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swrast: Add a note about overlapping support for framebuffer blit.

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Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Eric Anholt 2011-12-08 09:28:32 -08:00
parent 657f3214e7
commit b2469ff043
1 changed files with 9 additions and 1 deletions
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10
src/mesa/swrast/s_blit.c
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@ -478,7 +478,15 @@ simple_blit(struct gl_context *ctx,
ASSERT(srcX1 - srcX0 == dstX1 - dstX0);
ASSERT(srcY1 - srcY0 == dstY1 - dstY0);
/* determine if copy should be bottom-to-top or top-to-bottom */
/* From the GL_ARB_framebuffer_object spec:
*
* "If the source and destination buffers are identical, and the source
* and destination rectangles overlap, the result of the blit operation
* is undefined."
*
* However, we provide the expected result anyway by flipping the order of
* the memcpy of rows.
*/
if (srcY0 > dstY0) {
/* src above dst: copy bottom-to-top */
yStep = 1;