diff options
| author | Brian Paul <[email protected]> | 2008-09-17 08:17:02 -0600 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2008-09-17 08:17:02 -0600 |
| commit | f631093ce76ad14dee63293761d7da7b7b42fc6d (patch) | |
| tree | 8f7676233eaca5695a67ad1199c6c4cae6ae04d4 /src/gallium | |
| parent | 05aeb92a092c26e7773beb95692fc72e70a40e56 (diff) | |
cell: example of doing fs/fm sequence with fnms in blending
Diffstat (limited to 'src/gallium')
| -rw-r--r-- | src/gallium/drivers/cell/ppu/cell_gen_fragment.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/gallium/drivers/cell/ppu/cell_gen_fragment.c b/src/gallium/drivers/cell/ppu/cell_gen_fragment.c index 99407b8acee..2c80dd712e6 100644 --- a/src/gallium/drivers/cell/ppu/cell_gen_fragment.c +++ b/src/gallium/drivers/cell/ppu/cell_gen_fragment.c @@ -623,6 +623,7 @@ gen_blend(const struct pipe_blend_state *blend, spe_fm(f, term2B_reg, fbB_reg, fragA_reg); break; case PIPE_BLENDFACTOR_INV_SRC_ALPHA: +#if 0 /* one = {1.0, 1.0, 1.0, 1.0} */ if (!one_reg_set) { one_reg = spe_allocate_available_register(f); @@ -635,6 +636,15 @@ gen_blend(const struct pipe_blend_state *blend, spe_fm(f, term2R_reg, fbR_reg, tmp_reg); spe_fm(f, term2G_reg, fbG_reg, tmp_reg); spe_fm(f, term2B_reg, fbB_reg, tmp_reg); +#else + /* Compute: term2x = fbx * (1.0 - fragA) + * Which is: term2x = fbx - fbx * fragA + * Use fnms t,a,b,c which computes t=c-a*b + */ + spe_fnms(f, term2R_reg, fbR_reg, fragA_reg, fbR_reg); + spe_fnms(f, term2G_reg, fbG_reg, fragA_reg, fbG_reg); + spe_fnms(f, term2B_reg, fbB_reg, fragA_reg, fbB_reg); +#endif break; /* XXX more cases */ // GL_ONE_MINUS_SRC_COLOR @@ -663,6 +673,7 @@ gen_blend(const struct pipe_blend_state *blend, spe_fm(f, term2A_reg, fbA_reg, fragA_reg); break; case PIPE_BLENDFACTOR_INV_SRC_ALPHA: +#if 0 /* one = {1.0, 1.0, 1.0, 1.0} */ if (!one_reg_set) { one_reg = spe_allocate_available_register(f); @@ -673,6 +684,13 @@ gen_blend(const struct pipe_blend_state *blend, spe_fs(f, tmp_reg, one_reg, fragA_reg); /* termA = fbA * tmp */ spe_fm(f, term2A_reg, fbA_reg, tmp_reg); +#else + /* Compute: term2A = fbA * (1.0 - fragA) + * Which is: term2A = fbA - fbA * fragA + * Use fnms t,a,b,c which computes t=c-a*b + */ + spe_fnms(f, term2A_reg, fbA_reg, fragA_reg, fbA_reg); +#endif break; /* XXX more cases */ // GL_ONE_MINUS_SRC_COLOR |