diff options
| author | Brian Paul <[email protected]> | 2011-11-26 08:54:57 -0700 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2011-11-28 08:13:04 -0700 |
| commit | e68994494b159d4f44e34b6b6c1d489a184a2dfe (patch) | |
| tree | bc092393a00569f4749217696a6c6c98c56bc94c /src/mesa/main/ff_fragment_shader.cpp | |
| parent | 56b870e44106188f425df6eb45b7a394f0420e5e (diff) | |
mesa: fix frag shader generation for alpha test with no color buffers
If alpha test is enabled and there's no color buffers we still need the
fragment shader to emit a color.
v2: add _NEW_COLOR flag in _mesa_update_state_locked()
Fixes piglit fbo-alphatest-nocolor-ff failures with Gallium drivers.
Reviewed-by: Eric Anholt <[email protected]>
Tested-by: Eric Anholt <[email protected]> (i965)
Diffstat (limited to 'src/mesa/main/ff_fragment_shader.cpp')
| -rw-r--r-- | 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 2ce81fef61e..3d7947bae10 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 */ |