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| author | Chia-I Wu <olv@lunarg.com> | 2010-12-04 21:42:51 +0800 |
|---|---|---|
| committer | Chia-I Wu <olv@lunarg.com> | 2010-12-04 23:46:38 +0800 |
| commit | 859106f196ade77f59f8787b071739901cd1a843 (patch) | |
| tree | 632ca04f16bcf6ad64614b3cf86b278181591099 /src/gallium/state_trackers/vega/shader.c | |
| parent | 0ee73edeccd21034e03e9e43dd0d09fa6fbf7842 (diff) | |
st/vega: Fix pipe blend state for various blend modes.
rgb_src_factor and rgb_dst_factor should be PIPE_BLENDFACTOR_ONE for
VG_BLEND_SRC_IN and VG_BLEND_DST_IN respectively. VG_BLEND_SRC_OVER can
be supported only when the fb has no alpha channel. VG_BLEND_DST_OVER
and VG_BLEND_ADDITIVE have to be supported with a shader.
Note that Porter-Duff blending rules assume premultiplied alpha.
Diffstat (limited to 'src/gallium/state_trackers/vega/shader.c')
| -rw-r--r-- | src/gallium/state_trackers/vega/shader.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/gallium/state_trackers/vega/shader.c b/src/gallium/state_trackers/vega/shader.c index 92d3f5549e..0ed721376c 100644 --- a/src/gallium/state_trackers/vega/shader.c +++ b/src/gallium/state_trackers/vega/shader.c @@ -39,6 +39,7 @@ #include "util/u_inlines.h" #include "util/u_memory.h" #include "util/u_math.h" +#include "util/u_format.h" #define MAX_CONSTANTS 28 @@ -133,10 +134,16 @@ static VGboolean blend_use_shader(struct vg_context *ctx) VGboolean advanced_blending; switch (ctx->state.vg.blend_mode) { + case VG_BLEND_SRC_OVER: + advanced_blending = + util_format_has_alpha(ctx->draw_buffer->strb->format); + break; + case VG_BLEND_DST_OVER: case VG_BLEND_MULTIPLY: case VG_BLEND_SCREEN: case VG_BLEND_DARKEN: case VG_BLEND_LIGHTEN: + case VG_BLEND_ADDITIVE: advanced_blending = VG_TRUE; break; default: |