diff options
| author | Brian Paul <brianp@vmware.com> | 2011-11-26 08:54:57 -0700 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2011-11-28 08:13:04 -0700 |
| commit | e68994494b159d4f44e34b6b6c1d489a184a2dfe (patch) | |
| tree | bc092393a00569f4749217696a6c6c98c56bc94c | |
| 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 <eric@anholt.net>
Tested-by: Eric Anholt <eric@anholt.net> (i965)
| -rw-r--r-- | src/mesa/main/ff_fragment_shader.cpp | 6 | ||||
| -rw-r--r-- | src/mesa/main/state.c | 2 |
2 files changed, 7 insertions, 1 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 */ diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c index 80fd03b919d..bed6c898dc3 100644 --- a/src/mesa/main/state.c +++ b/src/mesa/main/state.c @@ -589,7 +589,7 @@ _mesa_update_state_locked( struct gl_context *ctx ) if (ctx->FragmentProgram._MaintainTexEnvProgram) { prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG | _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE | - _NEW_PROGRAM | _NEW_FRAG_CLAMP); + _NEW_PROGRAM | _NEW_FRAG_CLAMP | _NEW_COLOR); } if (ctx->VertexProgram._MaintainTnlProgram) { prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX | |