From c0554141a9b831b4e614747104dcbbe0fe489b9d Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Mon, 28 Jan 2013 22:03:18 -0800 Subject: [PATCH] i965/blorp: Support overriding destination alpha to 1.0. Currently, Blorp requires the source and destination formats to be equal. However, we'd really like to be able to blit between XRGB and ARGB formats; our BLT engine paths have supported this for a long time. For ARGB -> XRGB, nothing needs to occur: the missing alpha is already interpreted as 1.0. For XRGB -> ARGB, we need to smash the alpha channel to 1.0 when writing the destination colors. This is fairly straightforward with blending. For now, this code is never used, as the source and destination formats still must be equal. The next patch will relax that restriction. NOTE: This is a candidate for the 9.1 branch. Signed-off-by: Kenneth Graunke Reviewed-by: Ian Romanick Tested-by: Martin Steigerwald --- src/mesa/drivers/dri/i965/gen6_blorp.cpp | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) 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; } -- 2.30.2