If alpha test is enabled and there's no color buffers we still need the
fragment shader to emit a color.
Fixes piglit fbo-alphatest-nocolor-ff failures with Gallium drivers.
---
src/mesa/main/ff_fragment_shader.cpp | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/src/mesa/main/ff_fragment_shader.cpp
b/src/mesa/main/ff_fragment_shader.cpp
index 2ce81fe..3d7947b 100644
--- a/src/mesa/main/ff_fragment_shader.cpp
+++ b/src/mesa/main/ff_fragment_shader.cpp
@@ -489,6 +489,12 @@ static GLuint make_state_key( struct gl_context *ctx,
struct state_key *key )
/* _NEW_BUFFERS */
key->num_draw_buffers = ctx->DrawBuffer->_NumColorDrawBuffers;
+ /* _NEW_COLOR */
+ if (ctx->Color.AlphaEnabled && key->num_draw_buffers == 0) {
+ /* if alpha test is enabled we need to emit at least one color */
+ key->num_draw_buffers = 1;
+ }
+
key->inputs_available = (inputs_available & inputs_referenced);
/* compute size of state key, ignoring unused texture units */
--
1.7.3.4
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