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i965: Fix scissor-offscreen on gen6 like we did pre-gen6.

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This commit is contained in:
Eric Anholt 2010-10-18 13:11:29 -07:00
parent 022531209d
commit 641028debf
1 changed files with 13 additions and 1 deletions
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14
src/mesa/drivers/dri/i965/gen6_scissor_state.c
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@ -46,7 +46,19 @@ prepare_scissor_state(struct brw_context *brw)
* Note that the hardware's coordinates are inclusive, while Mesa's min is
* inclusive but max is exclusive.
*/
if (render_to_fbo) {
if (ctx->DrawBuffer->_Xmin == ctx->DrawBuffer->_Xmax ||
ctx->DrawBuffer->_Ymin == ctx->DrawBuffer->_Ymax) {
/* If the scissor was out of bounds and got clamped to 0
* width/height at the bounds, the subtraction of 1 from
* maximums could produce a negative number and thus not clip
* anything. Instead, just provide a min > max scissor inside
* the bounds, which produces the expected no rendering.
*/
scissor.xmin = 1;
scissor.xmax = 0;
scissor.ymin = 1;
scissor.ymax = 0;
} else if (render_to_fbo) {
/* texmemory: Y=0=bottom */
scissor.xmin = ctx->DrawBuffer->_Xmin;
scissor.xmax = ctx->DrawBuffer->_Xmax - 1;