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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <string_view>
#include "shader_recompiler/backend/glsl/emit_context.h"
#include "shader_recompiler/backend/glsl/emit_glsl_instructions.h"
#include "shader_recompiler/frontend/ir/program.h"
#include "shader_recompiler/frontend/ir/value.h"
#include "shader_recompiler/profile.h"
namespace Shader::Backend::GLSL {
namespace {
std::string_view OutputVertexIndex(EmitContext& ctx) {
return ctx.stage == Stage::TessellationControl ? "[gl_InvocationID]" : "";
}
void InitializeOutputVaryings(EmitContext& ctx) {
if (ctx.uses_geometry_passthrough) {
return;
}
if (ctx.stage == Stage::VertexB || ctx.stage == Stage::Geometry) {
ctx.Add("gl_Position=vec4(0,0,0,1);");
}
for (size_t index = 0; index < IR::NUM_GENERICS; ++index) {
if (!ctx.info.stores.Generic(index)) {
continue;
}
const auto& info_array{ctx.output_generics.at(index)};
const auto output_decorator{OutputVertexIndex(ctx)};
size_t element{};
while (element < info_array.size()) {
const auto& info{info_array.at(element)};
const auto varying_name{fmt::format("{}{}", info.name, output_decorator)};
switch (info.num_components) {
case 1: {
const char value{element == 3 ? '1' : '0'};
ctx.Add("{}={}.f;", varying_name, value);
break;
}
case 2:
case 3:
if (element + info.num_components < 4) {
ctx.Add("{}=vec{}(0);", varying_name, info.num_components);
} else {
// last element is the w component, must be initialized to 1
const auto zeros{info.num_components == 3 ? "0,0," : "0,"};
ctx.Add("{}=vec{}({}1);", varying_name, info.num_components, zeros);
}
break;
case 4:
ctx.Add("{}=vec4(0,0,0,1);", varying_name);
break;
default:
break;
}
element += info.num_components;
}
}
}
} // Anonymous namespace
void EmitPhi(EmitContext& ctx, IR::Inst& phi) {
const size_t num_args{phi.NumArgs()};
for (size_t i = 0; i < num_args; ++i) {
ctx.var_alloc.Consume(phi.Arg(i));
}
if (!phi.Definition<Id>().is_valid) {
// The phi node wasn't forward defined
ctx.var_alloc.PhiDefine(phi, phi.Arg(0).Type());
}
}
void EmitVoid(EmitContext&) {}
void EmitReference(EmitContext& ctx, const IR::Value& value) {
ctx.var_alloc.Consume(value);
}
void EmitPhiMove(EmitContext& ctx, const IR::Value& phi_value, const IR::Value& value) {
IR::Inst& phi{*phi_value.InstRecursive()};
const auto phi_type{phi.Arg(0).Type()};
if (!phi.Definition<Id>().is_valid) {
// The phi node wasn't forward defined
ctx.var_alloc.PhiDefine(phi, phi_type);
}
const auto phi_reg{ctx.var_alloc.Consume(IR::Value{&phi})};
const auto val_reg{ctx.var_alloc.Consume(value)};
if (phi_reg == val_reg) {
return;
}
ctx.Add("{}={};", phi_reg, val_reg);
}
void EmitPrologue(EmitContext& ctx) {
InitializeOutputVaryings(ctx);
}
void EmitEpilogue(EmitContext&) {}
void EmitEmitVertex(EmitContext& ctx, const IR::Value& stream) {
ctx.Add("EmitStreamVertex(int({}));", ctx.var_alloc.Consume(stream));
InitializeOutputVaryings(ctx);
}
void EmitEndPrimitive(EmitContext& ctx, const IR::Value& stream) {
ctx.Add("EndStreamPrimitive(int({}));", ctx.var_alloc.Consume(stream));
}
} // namespace Shader::Backend::GLSL
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