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spirv: Implement alpha test

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This commit is contained in:
ameerj 2021-04-14 00:32:18 -04:00
parent b126987c59
commit 6c512f4bff
3 changed files with 95 additions and 1 deletions
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45
src/shader_recompiler/backend/spirv/emit_spirv_special.cpp
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@ -37,6 +37,48 @@ Id DefaultVarying(EmitContext& ctx, u32 num_components, u32 element, Id zero, Id
}
throw InvalidArgument("Bad element");
}
Id ComparisonFunction(EmitContext& ctx, CompareFunction comparison, Id operand_1, Id operand_2) {
switch (comparison) {
case CompareFunction::Never:
return ctx.false_value;
case CompareFunction::Less:
return ctx.OpFOrdLessThan(ctx.U1, operand_1, operand_2);
case CompareFunction::Equal:
return ctx.OpFOrdEqual(ctx.U1, operand_1, operand_2);
case CompareFunction::LessThanEqual:
return ctx.OpFOrdLessThanEqual(ctx.U1, operand_1, operand_2);
case CompareFunction::Greater:
return ctx.OpFOrdGreaterThan(ctx.U1, operand_1, operand_2);
case CompareFunction::NotEqual:
return ctx.OpFOrdNotEqual(ctx.U1, operand_1, operand_2);
case CompareFunction::GreaterThanEqual:
return ctx.OpFOrdGreaterThanEqual(ctx.U1, operand_1, operand_2);
case CompareFunction::Always:
return ctx.true_value;
}
throw InvalidArgument("Comparison function {}", comparison);
}
void AlphaTest(EmitContext& ctx) {
const auto comparison{*ctx.profile.alpha_test_func};
if (comparison == CompareFunction::Always) {
return;
}
const Id type{ctx.F32[1]};
const Id rt0_color{ctx.OpLoad(ctx.F32[4], ctx.frag_color[0])};
const Id alpha{ctx.OpCompositeExtract(type, rt0_color, 3u)};
const Id true_label{ctx.OpLabel()};
const Id discard_label{ctx.OpLabel()};
const Id alpha_reference{ctx.Constant(ctx.F32[1], ctx.profile.alpha_test_reference)};
const Id condition{ComparisonFunction(ctx, comparison, alpha, alpha_reference)};
ctx.OpBranchConditional(condition, true_label, discard_label);
ctx.AddLabel(discard_label);
ctx.OpKill();
ctx.AddLabel(true_label);
}
} // Anonymous namespace
void EmitPrologue(EmitContext& ctx) {
@ -68,6 +110,9 @@ void EmitEpilogue(EmitContext& ctx) {
if (ctx.stage == Stage::VertexB && ctx.profile.convert_depth_mode) {
ConvertDepthMode(ctx);
}
if (ctx.stage == Stage::Fragment) {
AlphaTest(ctx);
}
}
void EmitEmitVertex(EmitContext& ctx, const IR::Value& stream) {