diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/drivers/dri/i965/gen6_blorp.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/gen6_blorp.cpp b/src/mesa/drivers/dri/i965/gen6_blorp.cpp index eb618988f2a..3834ae230bf 100644 --- a/src/mesa/drivers/dri/i965/gen6_blorp.cpp +++ b/src/mesa/drivers/dri/i965/gen6_blorp.cpp @@ -283,6 +283,25 @@ gen6_blorp_emit_blend_state(struct brw_context *brw, blend->blend1.write_disable_b = false; blend->blend1.write_disable_a = false; + /* When blitting from an XRGB source to a ARGB destination, we need to + * interpret the missing channel as 1.0. Blending can do that for us: + * we simply use the RGB values from the fragment shader ("source RGB"), + * but smash the alpha channel to 1. + */ + if (_mesa_get_format_bits(params->dst.mt->format, GL_ALPHA_BITS) > 0 && + _mesa_get_format_bits(params->src.mt->format, GL_ALPHA_BITS) == 0) { + blend->blend0.blend_enable = 1; + blend->blend0.ia_blend_enable = 1; + + blend->blend0.blend_func = BRW_BLENDFUNCTION_ADD; + blend->blend0.ia_blend_func = BRW_BLENDFUNCTION_ADD; + + blend->blend0.source_blend_factor = BRW_BLENDFACTOR_SRC_COLOR; + blend->blend0.dest_blend_factor = BRW_BLENDFACTOR_ZERO; + blend->blend0.ia_source_blend_factor = BRW_BLENDFACTOR_ONE; + blend->blend0.ia_dest_blend_factor = BRW_BLENDFACTOR_ZERO; + } + return cc_blend_state_offset; } |