swrast: can't use deferred texture/shading if using KIL instruction

If the fragment program uses KIL, we have to execute it before z/stencil
testing.  Otherwise, deferred texture/shading lets us skip shading for
pixels that fail z/stencil testing.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/mesa/swrast/s_context.c b/src/mesa/swrast/s_context.c
index e7c2ace32c..abf0008565 100644
--- a/src/mesa/swrast/s_context.c
+++ b/src/mesa/swrast/s_context.c
@@ -220,6 +220,9 @@ _swrast_update_deferred_texture(GLcontext *ctx)
          /* Z comes from fragment program/shader */
          swrast->_DeferredTexture = GL_FALSE;
       }
+      else if (fprog && fprog->UsesKill) {
+         swrast->_DeferredTexture = GL_FALSE;
+      }
       else if (ctx->Query.CurrentOcclusionObject) {
          /* occlusion query depends on shader discard/kill results */
          swrast->_DeferredTexture = GL_FALSE;