diff options
| author | Brian <brian.paul@tungstengraphics.com> | 2007-07-03 17:13:04 -0600 |
|---|---|---|
| committer | Brian <brian.paul@tungstengraphics.com> | 2007-07-03 17:13:04 -0600 |
| commit | 111880798a7b67b79af3f7986e3297268c4b778a (patch) | |
| tree | 502450becc425f1bffe2a9bdfbe416bb8d394e18 /src/mesa/state_tracker/st_atom_blend.c | |
| parent | f6d4f5e1e9d626356311e1868b35b79d355af739 (diff) | |
Blend MIN/MAX modes are special: the src/dest terms are always one.
Diffstat (limited to 'src/mesa/state_tracker/st_atom_blend.c')
| -rw-r--r-- | src/mesa/state_tracker/st_atom_blend.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/src/mesa/state_tracker/st_atom_blend.c b/src/mesa/state_tracker/st_atom_blend.c index 03fbd290e0..e0215c9eef 100644 --- a/src/mesa/state_tracker/st_atom_blend.c +++ b/src/mesa/state_tracker/st_atom_blend.c @@ -169,12 +169,28 @@ update_blend( struct st_context *st ) blend.blend_enable = 1; blend.rgb_func = gl_blend_to_sp(st->ctx->Color.BlendEquationRGB); - blend.rgb_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcRGB); - blend.rgb_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstRGB); + if (st->ctx->Color.BlendEquationRGB == GL_MIN || + st->ctx->Color.BlendEquationRGB == GL_MAX) { + /* Min/max are special */ + blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE; + blend.rgb_dst_factor = PIPE_BLENDFACTOR_ONE; + } + else { + blend.rgb_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcRGB); + blend.rgb_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstRGB); + } blend.alpha_func = gl_blend_to_sp(st->ctx->Color.BlendEquationA); - blend.alpha_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcA); - blend.alpha_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstA); + if (st->ctx->Color.BlendEquationA == GL_MIN || + st->ctx->Color.BlendEquationA == GL_MAX) { + /* Min/max are special */ + blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE; + blend.alpha_dst_factor = PIPE_BLENDFACTOR_ONE; + } + else { + blend.alpha_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcA); + blend.alpha_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstA); + } } else { /* no blending / logicop */ |