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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "shader_recompiler/backend/spirv/emit_spirv.h"
namespace Shader::Backend::SPIRV {
namespace {
void ConvertDepthMode(EmitContext& ctx) {
const Id type{ctx.F32[1]};
const Id position{ctx.OpLoad(ctx.F32[4], ctx.output_position)};
const Id z{ctx.OpCompositeExtract(type, position, 2u)};
const Id w{ctx.OpCompositeExtract(type, position, 3u)};
const Id screen_depth{ctx.OpFMul(type, ctx.OpFAdd(type, z, w), ctx.Constant(type, 0.5f))};
const Id vector{ctx.OpCompositeInsert(ctx.F32[4], screen_depth, position, 2u)};
ctx.OpStore(ctx.output_position, vector);
}
void SetFixedPipelinePointSize(EmitContext& ctx) {
if (ctx.profile.fixed_state_point_size) {
const float point_size{*ctx.profile.fixed_state_point_size};
ctx.OpStore(ctx.output_point_size, ctx.Constant(ctx.F32[1], point_size));
}
}
Id DefaultVarying(EmitContext& ctx, u32 num_components, u32 element, Id zero, Id one,
Id default_vector) {
switch (num_components) {
case 1:
return element == 3 ? one : zero;
case 2:
return ctx.ConstantComposite(ctx.F32[2], zero, element + 1 == 3 ? one : zero);
case 3:
return ctx.ConstantComposite(ctx.F32[3], zero, zero, element + 2 == 3 ? one : zero);
case 4:
return default_vector;
}
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;
}
if (!Sirit::ValidId(ctx.frag_color[0])) {
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.OpSelectionMerge(true_label, spv::SelectionControlMask::MaskNone);
ctx.OpBranchConditional(condition, true_label, discard_label);
ctx.AddLabel(discard_label);
ctx.OpKill();
ctx.AddLabel(true_label);
}
} // Anonymous namespace
void EmitPrologue(EmitContext& ctx) {
if (ctx.stage == Stage::VertexB) {
const Id zero{ctx.Constant(ctx.F32[1], 0.0f)};
const Id one{ctx.Constant(ctx.F32[1], 1.0f)};
const Id default_vector{ctx.ConstantComposite(ctx.F32[4], zero, zero, zero, one)};
ctx.OpStore(ctx.output_position, default_vector);
for (const auto& info : ctx.output_generics) {
if (info[0].num_components == 0) {
continue;
}
u32 element{0};
while (element < 4) {
const auto& element_info{info[element]};
const u32 num{element_info.num_components};
const Id value{DefaultVarying(ctx, num, element, zero, one, default_vector)};
ctx.OpStore(element_info.id, value);
element += num;
}
}
}
if (ctx.stage == Stage::VertexB || ctx.stage == Stage::Geometry) {
SetFixedPipelinePointSize(ctx);
}
}
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) {
if (ctx.profile.convert_depth_mode) {
ConvertDepthMode(ctx);
}
if (stream.IsImmediate()) {
ctx.OpEmitStreamVertex(ctx.Def(stream));
} else {
// LOG_WARNING(..., "EmitVertex's stream is not constant");
ctx.OpEmitStreamVertex(ctx.u32_zero_value);
}
// Restore fixed pipeline point size after emitting the vertex
SetFixedPipelinePointSize(ctx);
}
void EmitEndPrimitive(EmitContext& ctx, const IR::Value& stream) {
if (stream.IsImmediate()) {
ctx.OpEndStreamPrimitive(ctx.Def(stream));
} else {
// LOG_WARNING(..., "EndPrimitive's stream is not constant");
ctx.OpEndStreamPrimitive(ctx.u32_zero_value);
}
}
} // namespace Shader::Backend::SPIRV
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