From 111880798a7b67b79af3f7986e3297268c4b778a Mon Sep 17 00:00:00 2001 From: Brian Date: Tue, 3 Jul 2007 17:13:04 -0600 Subject: Blend MIN/MAX modes are special: the src/dest terms are always one. --- src/mesa/state_tracker/st_atom_blend.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) (limited to 'src') 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 */ -- cgit v1.2.3