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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 {
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 null_vector{ctx.ConstantComposite(ctx.F32[4], zero, zero, zero, zero)};
ctx.OpStore(ctx.output_position, ctx.ConstantComposite(ctx.F32[4], zero, zero, zero, one));
for (const Id generic_id : ctx.output_generics) {
if (Sirit::ValidId(generic_id)) {
ctx.OpStore(generic_id, null_vector);
}
}
}
}
void EmitEpilogue(EmitContext& ctx) {
if (ctx.profile.convert_depth_mode) {
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);
}
}
} // namespace Shader::Backend::SPIRV
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