diff options
| -rw-r--r-- | src/gallium/drivers/r300/r300_state.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c index 534c1b5935f..1dbf0bbd8cc 100644 --- a/src/gallium/drivers/r300/r300_state.c +++ b/src/gallium/drivers/r300/r300_state.c @@ -66,7 +66,11 @@ static void* r300_create_blend_state(struct pipe_context* pipe, ( r300_translate_blend_factor(srcRGB) << R300_SRC_BLEND_SHIFT) | ( r300_translate_blend_factor(dstRGB) << R300_DST_BLEND_SHIFT); - /* optimization: some operations do not require the destination color */ + /* Optimization: some operations do not require the destination color. + * + * When SRC_ALPHA_SATURATE is used, colorbuffer reads must be enabled, + * otherwise blending gives incorrect results. It seems to be + * a hardware bug. */ if (eqRGB == PIPE_BLEND_MIN || eqA == PIPE_BLEND_MIN || eqRGB == PIPE_BLEND_MAX || eqA == PIPE_BLEND_MAX || dstRGB != PIPE_BLENDFACTOR_ZERO || @@ -78,7 +82,8 @@ static void* r300_create_blend_state(struct pipe_context* pipe, srcA == PIPE_BLENDFACTOR_DST_COLOR || srcA == PIPE_BLENDFACTOR_DST_ALPHA || srcA == PIPE_BLENDFACTOR_INV_DST_COLOR || - srcA == PIPE_BLENDFACTOR_INV_DST_ALPHA) + srcA == PIPE_BLENDFACTOR_INV_DST_ALPHA || + srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE) blend->blend_control |= R300_READ_ENABLE; /* XXX implement the optimization with DISCARD_SRC_PIXELS*/ |