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panfrost/midgard: Skip blend for REPLACE (shader)

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-07-02 09:48:19 -07:00
parent 5e825f5cad
commit 5849c85008
1 changed files with 23 additions and 0 deletions
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23
src/gallium/drivers/panfrost/midgard/nir_lower_blend.c
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@ -200,12 +200,35 @@ nir_blend(
return nir_color_mask(b, options.rt[0].colormask, blended, dst);
}
static bool
nir_is_blend_channel_replace(nir_lower_blend_channel chan)
{
return
(chan.src_factor == BLEND_FACTOR_ZERO) &&
(chan.dst_factor == BLEND_FACTOR_ZERO) &&
(chan.invert_src_factor && !chan.invert_dst_factor) &&
(chan.func == BLEND_FUNC_ADD || chan.func == BLEND_FUNC_SUBTRACT || chan.func == BLEND_FUNC_MAX);
}
static bool
nir_is_blend_replace(nir_lower_blend_options options)
{
return
nir_is_blend_channel_replace(options.rt[0].rgb) &&
nir_is_blend_channel_replace(options.rt[0].alpha);
}
void
nir_lower_blend(nir_shader *shader, nir_lower_blend_options options)
{
/* Blend shaders are represented as special fragment shaders */
assert(shader->info.stage == MESA_SHADER_FRAGMENT);
/* Special case replace, since there's nothing to do and we don't want to
* degrade intermediate precision (e.g. for non-blendable R32F targets) */
if (nir_is_blend_replace(options))
return;
nir_foreach_function(func, shader) {
nir_foreach_block(block, func->impl) {
nir_foreach_instr_safe(instr, block) {