diff options
Diffstat (limited to 'src/gallium/drivers/r300/r300_state.c')
| -rw-r--r-- | src/gallium/drivers/r300/r300_state.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c index f8cce112ee6..872a393321d 100644 --- a/src/gallium/drivers/r300/r300_state.c +++ b/src/gallium/drivers/r300/r300_state.c @@ -198,9 +198,36 @@ static void* r300_create_blend_state(struct pipe_context* pipe, srcA == PIPE_BLENDFACTOR_DST_ALPHA || srcA == PIPE_BLENDFACTOR_INV_DST_COLOR || srcA == PIPE_BLENDFACTOR_INV_DST_ALPHA || - srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE) + srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE) { + /* Enable reading from the colorbuffer. */ blend->blend_control |= R300_READ_ENABLE; + if (r300_screen(r300_context(pipe)->context.screen)->caps->is_r500) { + /* Optimization: Depending on incoming pixels, we can + * conditionally disable the reading in hardware... */ + if (eqRGB != PIPE_BLEND_MIN && eqA != PIPE_BLEND_MIN && + eqRGB != PIPE_BLEND_MAX && eqA != PIPE_BLEND_MAX) { + /* Disable reading if SRC_ALPHA == 0. */ + if ((dstRGB == PIPE_BLENDFACTOR_SRC_ALPHA || + dstRGB == PIPE_BLENDFACTOR_ZERO) && + (dstA == PIPE_BLENDFACTOR_SRC_COLOR || + dstA == PIPE_BLENDFACTOR_SRC_ALPHA || + dstA == PIPE_BLENDFACTOR_ZERO)) { + blend->blend_control |= R500_SRC_ALPHA_0_NO_READ; + } + + /* Disable reading if SRC_ALPHA == 1. */ + if ((dstRGB == PIPE_BLENDFACTOR_INV_SRC_ALPHA || + dstRGB == PIPE_BLENDFACTOR_ZERO) && + (dstA == PIPE_BLENDFACTOR_INV_SRC_COLOR || + dstA == PIPE_BLENDFACTOR_INV_SRC_ALPHA || + dstA == PIPE_BLENDFACTOR_ZERO)) { + blend->blend_control |= R500_SRC_ALPHA_1_NO_READ; + } + } + } + } + /* Optimization: discard pixels which don't change the colorbuffer. * * The code below is non-trivial and some math is involved. @@ -246,8 +273,6 @@ static void* r300_create_blend_state(struct pipe_context* pipe, } } - /* XXX implement the optimization with SRC_ALPHA_?_NO_READ */ - /* separate alpha */ if (srcA != srcRGB || dstA != dstRGB || eqA != eqRGB) { blend->blend_control |= R300_SEPARATE_ALPHA_ENABLE; |