// 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/value.h"
#include "shader_recompiler/profile.h"
namespace Shader::Backend::GLSL {
namespace {
constexpr char SWIZZLE[]{"xyzw"};
u32 CbufIndex(u32 offset) {
return (offset / 4) % 4;
}
char OffsetSwizzle(u32 offset) {
return SWIZZLE[CbufIndex(offset)];
}
bool IsInputArray(Stage stage) {
return stage == Stage::Geometry || stage == Stage::TessellationControl ||
stage == Stage::TessellationEval;
}
std::string InputVertexIndex(EmitContext& ctx, std::string_view vertex) {
return IsInputArray(ctx.stage) ? fmt::format("[{}]", vertex) : "";
}
std::string OutputVertexIndex(EmitContext& ctx, std::string_view vertex) {
switch (ctx.stage) {
case Stage::Geometry:
return fmt::format("[{}]", vertex);
case Stage::TessellationControl:
return "[gl_InvocationID]";
default:
return "";
}
}
} // Anonymous namespace
void EmitGetCbufU8(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset) {
if (offset.IsImmediate()) {
ctx.AddU32("{}=bitfieldExtract(ftou({}_cbuf{}[{}].{}),int({}),8);", inst, ctx.stage_name,
binding.U32(), offset.U32() / 16, OffsetSwizzle(offset.U32()),
(offset.U32() % 4) * 8);
} else {
const auto offset_var{ctx.var_alloc.Consume(offset)};
ctx.AddU32("{}=bitfieldExtract(ftou({}_cbuf{}[{}/16][({}>>2)%4]),int(({}%4)*8),8);", inst,
ctx.stage_name, binding.U32(), offset_var, offset_var, offset_var);
}
}
void EmitGetCbufS8(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset) {
if (offset.IsImmediate()) {
ctx.AddU32("{}=bitfieldExtract(ftoi({}_cbuf{}[{}].{}),int({}),8);", inst, ctx.stage_name,
binding.U32(), offset.U32() / 16, OffsetSwizzle(offset.U32()),
(offset.U32() % 4) * 8);
} else {
const auto offset_var{ctx.var_alloc.Consume(offset)};
ctx.AddU32("{}=bitfieldExtract(ftoi({}_cbuf{}[{}/16][({}>>2)%4]),int(({}%4)*8),8);", inst,
ctx.stage_name, binding.U32(), offset_var, offset_var, offset_var);
}
}
void EmitGetCbufU16(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset) {
if (offset.IsImmediate()) {
ctx.AddU32("{}=bitfieldExtract(ftou({}_cbuf{}[{}].{}),int({}),16);", inst, ctx.stage_name,
binding.U32(), offset.U32() / 16, OffsetSwizzle(offset.U32()),
((offset.U32() / 2) % 2) * 16);
} else {
const auto offset_var{ctx.var_alloc.Consume(offset)};
ctx.AddU32("{}=bitfieldExtract(ftou({}_cbuf{}[{}/16][({}>>2)%4]),int((({}/"
"2)%2)*16),16);",
inst, ctx.stage_name, binding.U32(), offset_var, offset_var, offset_var);
}
}
void EmitGetCbufS16(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset) {
if (offset.IsImmediate()) {
ctx.AddU32("{}=bitfieldExtract(ftoi({}_cbuf{}[{}].{}),int({}),16);", inst, ctx.stage_name,
binding.U32(), offset.U32() / 16, OffsetSwizzle(offset.U32()),
((offset.U32() / 2) % 2) * 16);
} else {
const auto offset_var{ctx.var_alloc.Consume(offset)};
ctx.AddU32("{}=bitfieldExtract(ftoi({}_cbuf{}[{}/16][({}>>2)%4]),int((({}/"
"2)%2)*16),16);",
inst, ctx.stage_name, binding.U32(), offset_var, offset_var, offset_var);
}
}
void EmitGetCbufU32(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset) {
if (offset.IsImmediate()) {
ctx.AddU32("{}=ftou({}_cbuf{}[{}].{});", inst, ctx.stage_name, binding.U32(),
offset.U32() / 16, OffsetSwizzle(offset.U32()));
} else {
const auto offset_var{ctx.var_alloc.Consume(offset)};
ctx.AddU32("{}=ftou({}_cbuf{}[{}/16][({}>>2)%4]);", inst, ctx.stage_name, binding.U32(),
offset_var, offset_var);
}
}
void EmitGetCbufF32(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset) {
if (offset.IsImmediate()) {
ctx.AddF32("{}={}_cbuf{}[{}].{};", inst, ctx.stage_name, binding.U32(), offset.U32() / 16,
OffsetSwizzle(offset.U32()));
} else {
const auto offset_var{ctx.var_alloc.Consume(offset)};
ctx.AddF32("{}={}_cbuf{}[{}/16][({}>>2)%4];", inst, ctx.stage_name, binding.U32(),
offset_var, offset_var);
}
}
void EmitGetCbufU32x2(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset) {
if (offset.IsImmediate()) {
ctx.AddU32x2("{}=uvec2(ftou({}_cbuf{}[{}].{}),ftou({}_cbuf{}[{}].{}));", inst,
ctx.stage_name, binding.U32(), offset.U32() / 16, OffsetSwizzle(offset.U32()),
ctx.stage_name, binding.U32(), (offset.U32() + 4) / 16,
OffsetSwizzle(offset.U32() + 4));
} else {
const auto offset_var{ctx.var_alloc.Consume(offset)};
ctx.AddU32x2("{}=uvec2(ftou({}_cbuf{}[{}/16][({}/"
"4)%4]),ftou({}_cbuf{}[({}+4)/16][(({}+4)>>2)%4]));",
inst, ctx.stage_name, binding.U32(), offset_var, offset_var, ctx.stage_name,
binding.U32(), offset_var, offset_var);
}
}
void EmitGetAttribute(EmitContext& ctx, IR::Inst& inst, IR::Attribute attr,
std::string_view vertex) {
const u32 element{static_cast<u32>(attr) % 4};
const char swizzle{"xyzw"[element]};
if (IR::IsGeneric(attr)) {
const u32 index{IR::GenericAttributeIndex(attr)};
ctx.AddF32("{}=in_attr{}{}.{};", inst, index, InputVertexIndex(ctx, vertex), swizzle);
return;
}
switch (attr) {
case IR::Attribute::PositionX:
case IR::Attribute::PositionY:
case IR::Attribute::PositionZ:
case IR::Attribute::PositionW:
switch (ctx.stage) {
case Stage::VertexA:
case Stage::VertexB:
ctx.AddF32("{}=gl_Position.{};", inst, swizzle);
break;
case Stage::TessellationEval:
ctx.AddF32("{}=gl_TessCoord.{};", inst, swizzle);
break;
case Stage::TessellationControl:
case Stage::Geometry:
ctx.AddF32("{}=gl_in[{}].gl_Position.{};", inst, vertex, swizzle);
break;
case Stage::Fragment:
ctx.AddF32("{}=gl_FragCoord.{};", inst, swizzle);
break;
default:
throw NotImplementedException("Get Position for stage {}", ctx.stage);
}
break;
case IR::Attribute::PointSpriteS:
case IR::Attribute::PointSpriteT:
ctx.AddF32("{}=gl_PointCoord.{};", inst, swizzle);
break;
case IR::Attribute::InstanceId:
ctx.AddF32("{}=itof(gl_InstanceID);", inst);
break;
case IR::Attribute::VertexId:
ctx.AddF32("{}=itof(gl_VertexID);", inst);
break;
case IR::Attribute::FrontFace:
ctx.AddF32("{}=itof(gl_FrontFacing?-1:0);", inst);
break;
case IR::Attribute::TessellationEvaluationPointU:
case IR::Attribute::TessellationEvaluationPointV:
ctx.AddF32("{}=gl_TessCoord.{};", inst, swizzle);
break;
default:
fmt::print("Get attribute {}", attr);
throw NotImplementedException("Get attribute {}", attr);
}
}
void EmitSetAttribute(EmitContext& ctx, IR::Attribute attr, std::string_view value,
std::string_view vertex) {
if (IR::IsGeneric(attr)) {
const u32 index{IR::GenericAttributeIndex(attr)};
const u32 element{IR::GenericAttributeElement(attr)};
const GenericElementInfo& info{ctx.output_generics.at(index).at(element)};
const auto output_decorator{OutputVertexIndex(ctx, vertex)};
if (info.num_components == 1) {
ctx.Add("{}{}={};", info.name, output_decorator, value);
} else {
const u32 index_element{element - info.first_element};
ctx.Add("{}{}.{}={};", info.name, output_decorator, "xyzw"[index_element], value);
}
return;
}
const u32 element{static_cast<u32>(attr) % 4};
const char swizzle{"xyzw"[element]};
switch (attr) {
case IR::Attribute::PointSize:
ctx.Add("gl_PointSize={};", value);
break;
case IR::Attribute::PositionX:
case IR::Attribute::PositionY:
case IR::Attribute::PositionZ:
case IR::Attribute::PositionW:
ctx.Add("gl_Position.{}={};", swizzle, value);
break;
case IR::Attribute::ViewportIndex:
if (ctx.stage != Stage::Geometry && !ctx.profile.support_gl_vertex_viewport_layer) {
// LOG_WARNING(..., "Shader stores viewport index but device does not support viewport
// layer extension");
break;
}
ctx.Add("gl_ViewportIndex=ftoi({});", value);
break;
case IR::Attribute::ClipDistance0:
case IR::Attribute::ClipDistance1:
case IR::Attribute::ClipDistance2:
case IR::Attribute::ClipDistance3:
case IR::Attribute::ClipDistance4:
case IR::Attribute::ClipDistance5:
case IR::Attribute::ClipDistance6:
case IR::Attribute::ClipDistance7: {
const u32 index{static_cast<u32>(attr) - static_cast<u32>(IR::Attribute::ClipDistance0)};
ctx.Add("gl_ClipDistance[{}]={};", index, value);
break;
}
default:
throw NotImplementedException("Set attribute {}", attr);
}
}
void EmitGetPatch(EmitContext& ctx, IR::Inst& inst, IR::Patch patch) {
if (!IR::IsGeneric(patch)) {
throw NotImplementedException("Non-generic patch load");
}
const u32 index{IR::GenericPatchIndex(patch)};
const u32 element{IR::GenericPatchElement(patch)};
const char swizzle{"xyzw"[element]};
ctx.AddF32("{}=patch{}.{};", inst, index, swizzle);
}
void EmitSetPatch(EmitContext& ctx, IR::Patch patch, std::string_view value) {
if (IR::IsGeneric(patch)) {
const u32 index{IR::GenericPatchIndex(patch)};
const u32 element{IR::GenericPatchElement(patch)};
ctx.Add("patch{}.{}={};", index, "xyzw"[element], value);
return;
}
switch (patch) {
case IR::Patch::TessellationLodLeft:
case IR::Patch::TessellationLodRight:
case IR::Patch::TessellationLodTop:
case IR::Patch::TessellationLodBottom: {
const u32 index{static_cast<u32>(patch) - u32(IR::Patch::TessellationLodLeft)};
ctx.Add("gl_TessLevelOuter[{}]={};", index, value);
break;
}
case IR::Patch::TessellationLodInteriorU:
ctx.Add("gl_TessLevelInner[0]={};", value);
break;
case IR::Patch::TessellationLodInteriorV:
ctx.Add("gl_TessLevelInner[1]={};", value);
break;
default:
throw NotImplementedException("Patch {}", patch);
}
}
void EmitSetFragColor(EmitContext& ctx, u32 index, u32 component, std::string_view value) {
const char swizzle{"xyzw"[component]};
ctx.Add("frag_color{}.{}={};", index, swizzle, value);
}
void EmitLocalInvocationId(EmitContext& ctx, IR::Inst& inst) {
ctx.AddU32x3("{}=gl_LocalInvocationID;", inst);
}
void EmitLoadLocal(EmitContext& ctx, IR::Inst& inst, std::string_view word_offset) {
ctx.AddU32("{}=lmem[{}];", inst, word_offset);
}
void EmitWriteLocal(EmitContext& ctx, std::string_view word_offset, std::string_view value) {
ctx.Add("lmem[{}]={};", word_offset, value);
}
} // namespace Shader::Backend::GLSL
