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-rw-r--r--src/mesa/drivers/dri/i965/brw_sf_state.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_sf_state.c b/src/mesa/drivers/dri/i965/brw_sf_state.c
index 9712c31afe..1a6c8218fd 100644
--- a/src/mesa/drivers/dri/i965/brw_sf_state.c
+++ b/src/mesa/drivers/dri/i965/brw_sf_state.c
@@ -76,7 +76,20 @@ static void upload_sf_vp(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.
+ */
+ sfv.scissor.xmin = 1;
+ sfv.scissor.xmax = 0;
+ sfv.scissor.ymin = 1;
+ sfv.scissor.ymax = 0;
+ } else if (render_to_fbo) {
/* texmemory: Y=0=bottom */
sfv.scissor.xmin = ctx->DrawBuffer->_Xmin;
sfv.scissor.xmax = ctx->DrawBuffer->_Xmax - 1;