diff options
Diffstat (limited to 'src/video_core/shader')
| -rw-r--r-- | src/video_core/shader/glsl_decompiler.cpp | 1393 | ||||
| -rw-r--r-- | src/video_core/shader/glsl_decompiler.h | 88 |
2 files changed, 1481 insertions, 0 deletions
diff --git a/src/video_core/shader/glsl_decompiler.cpp b/src/video_core/shader/glsl_decompiler.cpp new file mode 100644 index 000000000..46a48652d --- /dev/null +++ b/src/video_core/shader/glsl_decompiler.cpp @@ -0,0 +1,1393 @@ +// Copyright 2018 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include <string> +#include <string_view> +#include <variant> + +#include <fmt/format.h> + +#include "common/alignment.h" +#include "common/assert.h" +#include "common/common_types.h" +#include "video_core/engines/maxwell_3d.h" +#include "video_core/shader/glsl_decompiler.h" +#include "video_core/shader/shader_ir.h" + +namespace OpenGL::GLShader { + +using Tegra::Shader::Attribute; +using Tegra::Shader::Header; +using Tegra::Shader::IpaInterpMode; +using Tegra::Shader::IpaMode; +using Tegra::Shader::IpaSampleMode; +using namespace VideoCommon::Shader; + +using Maxwell = Tegra::Engines::Maxwell3D::Regs; +using ShaderStage = Tegra::Engines::Maxwell3D::Regs::ShaderStage; +using Operation = const OperationNode&; + +enum : u32 { POSITION_VARYING_LOCATION = 0, GENERIC_VARYING_START_LOCATION = 1 }; +constexpr u32 MAX_CONSTBUFFER_ELEMENTS = 65536 / 16; // TODO(Rodrigo): Use rasterizer's value + +enum class Type { Bool, Float, Int, Uint, HalfFloat }; + +class ShaderWriter { +public: + void AddExpression(std::string_view text) { + DEBUG_ASSERT(scope >= 0); + if (!text.empty()) { + AppendIndentation(); + } + shader_source += text; + } + + void AddLine(std::string_view text) { + AddExpression(text); + AddNewLine(); + } + + void AddLine(char character) { + DEBUG_ASSERT(scope >= 0); + AppendIndentation(); + shader_source += character; + AddNewLine(); + } + + void AddNewLine() { + DEBUG_ASSERT(scope >= 0); + shader_source += '\n'; + } + + std::string GenerateTemporal() { + std::string temporal = "tmp"; + temporal += std::to_string(temporal_index++); + return temporal; + } + + std::string GetResult() { + return std::move(shader_source); + } + + s32 scope = 0; + +private: + void AppendIndentation() { + shader_source.append(static_cast<std::size_t>(scope) * 4, ' '); + } + + std::string shader_source; + u32 temporal_index = 1; +}; + +/// Generates code to use for a swizzle operation. +static std::string GetSwizzle(u32 elem) { + ASSERT(elem <= 3); + std::string swizzle = "."; + swizzle += "xyzw"[elem]; + return swizzle; +} + +static bool IsPrecise(Operation operand) { + const auto& meta = operand.GetMeta(); + + if (std::holds_alternative<MetaArithmetic>(meta)) { + return std::get<MetaArithmetic>(meta).precise; + } + if (std::holds_alternative<MetaHalfArithmetic>(meta)) { + return std::get<MetaHalfArithmetic>(meta).precise; + } + return false; +} + +static bool IsPrecise(Node node) { + if (!std::holds_alternative<OperationNode>(*node)) { + return false; + } + return IsPrecise(std::get<OperationNode>(*node)); +} + +class GLSLDecompiler final { +public: + explicit GLSLDecompiler(const ShaderIR& ir, ShaderStage stage, std::string suffix) + : ir{ir}, stage{stage}, suffix{suffix}, header{ir.GetHeader()} {} + + void Decompile() { + DeclareVertex(); + DeclareRegisters(); + DeclarePredicates(); + DeclareLocalMemory(); + DeclareInternalFlags(); + DeclareInputAttributes(); + DeclareOutputAttributes(); + DeclareConstantBuffers(); + DeclareSamplers(); + + code.AddLine("void execute_" + suffix + "() {"); + ++code.scope; + + // VM's program counter + const auto first_address = ir.GetBasicBlocks().begin()->first; + code.AddLine("uint jmp_to = " + std::to_string(first_address) + "u;"); + + // TODO(Subv): Figure out the actual depth of the flow stack, for now it seems + // unlikely that shaders will use 20 nested SSYs and PBKs. + constexpr u32 FLOW_STACK_SIZE = 20; + code.AddLine(fmt::format("uint flow_stack[{}];", FLOW_STACK_SIZE)); + code.AddLine("uint flow_stack_top = 0u;"); + + code.AddLine("while (true) {"); + ++code.scope; + + code.AddLine("switch (jmp_to) {"); + + for (const auto& pair : ir.GetBasicBlocks()) { + const auto [address, bb] = pair; + code.AddLine(fmt::format("case 0x{:x}u: {{", address)); + ++code.scope; + + VisitBasicBlock(bb); + + --code.scope; + code.AddLine('}'); + } + + code.AddLine("default: return;"); + code.AddLine('}'); + + for (std::size_t i = 0; i < 2; ++i) { + --code.scope; + code.AddLine('}'); + } + } + + std::string GetResult() { + return code.GetResult(); + } + + ShaderEntries GetShaderEntries() const { + ShaderEntries entries; + for (const auto& cbuf : ir.GetConstantBuffers()) { + ConstBufferEntry desc(cbuf.second, stage, GetConstBufferBlock(cbuf.first), cbuf.first); + entries.const_buffers.push_back(desc); + } + for (const auto& sampler : ir.GetSamplers()) { + SamplerEntry desc(sampler, stage, GetSampler(sampler)); + entries.samplers.push_back(desc); + } + entries.clip_distances = ir.GetClipDistances(); + entries.shader_length = ir.GetLength(); + return entries; + } + +private: + using OperationDecompilerFn = std::string (GLSLDecompiler::*)(Operation); + using OperationDecompilersArray = + std::array<OperationDecompilerFn, static_cast<std::size_t>(OperationCode::Amount)>; + + void DeclareVertex() { + if (stage != ShaderStage::Vertex) + return; + + bool clip_distances_declared = false; + + code.AddLine("out gl_PerVertex {"); + ++code.scope; + + code.AddLine("vec4 gl_Position;"); + + for (const auto o : ir.GetOutputAttributes()) { + if (o == Attribute::Index::PointSize) + code.AddLine("float gl_PointSize;"); + if (!clip_distances_declared && (o == Attribute::Index::ClipDistances0123 || + o == Attribute::Index::ClipDistances4567)) { + code.AddLine("float gl_ClipDistance[];"); + clip_distances_declared = true; + } + } + + --code.scope; + code.AddLine("};"); + code.AddNewLine(); + } + + void DeclareRegisters() { + const auto& registers = ir.GetRegisters(); + for (const u32 gpr : registers) { + code.AddLine("float " + GetRegister(gpr) + " = 0;"); + } + if (!registers.empty()) + code.AddNewLine(); + } + + void DeclarePredicates() { + const auto& predicates = ir.GetPredicates(); + for (const auto pred : predicates) { + code.AddLine("bool " + GetPredicate(pred) + " = false;"); + } + if (!predicates.empty()) + code.AddNewLine(); + } + + void DeclareLocalMemory() { + if (const u64 local_memory_size = header.GetLocalMemorySize(); local_memory_size > 0) { + const auto element_count = Common::AlignUp(local_memory_size, 4) / 4; + code.AddLine("float " + GetLocalMemory() + '[' + std::to_string(element_count) + "];"); + code.AddNewLine(); + } + } + + void DeclareInternalFlags() { + for (u32 flag = 0; flag < static_cast<u32>(InternalFlag::Amount); flag++) { + const InternalFlag flag_code = static_cast<InternalFlag>(flag); + code.AddLine("bool " + GetInternalFlag(flag_code) + " = false;"); + } + code.AddNewLine(); + } + + std::string GetInputFlags(const IpaMode& input_mode) { + const IpaSampleMode sample_mode = input_mode.sampling_mode; + const IpaInterpMode interp_mode = input_mode.interpolation_mode; + std::string out; + + switch (interp_mode) { + case IpaInterpMode::Flat: + out += "flat "; + break; + case IpaInterpMode::Linear: + out += "noperspective "; + break; + case IpaInterpMode::Perspective: + // Default, Smooth + break; + default: + UNIMPLEMENTED_MSG("Unhandled IPA interp mode: {}", static_cast<u32>(interp_mode)); + } + switch (sample_mode) { + case IpaSampleMode::Centroid: + // It can be implemented with the "centroid " keyword in GLSL + UNIMPLEMENTED_MSG("Unimplemented IPA sampler mode centroid"); + break; + case IpaSampleMode::Default: + // Default, n/a + break; + default: + UNIMPLEMENTED_MSG("Unimplemented IPA sampler mode: {}", static_cast<u32>(sample_mode)); + } + return out; + } + + void DeclareInputAttributes() { + const auto& attributes = ir.GetInputAttributes(); + for (const auto element : attributes) { + const Attribute::Index index = element.first; + const IpaMode& input_mode = *element.second.begin(); + if (index < Attribute::Index::Attribute_0 || index > Attribute::Index::Attribute_31) { + // Skip when it's not a generic attribute + continue; + } + + ASSERT(element.second.size() > 0); + // UNIMPLEMENTED_IF_MSG(element.second.size() > 1, + // "Multiple input flag modes are not supported in GLSL"); + + // TODO(bunnei): Use proper number of elements for these + u32 idx = static_cast<u32>(index) - static_cast<u32>(Attribute::Index::Attribute_0); + if (stage != ShaderStage::Vertex) { + // If inputs are varyings, add an offset + idx += GENERIC_VARYING_START_LOCATION; + } + + std::string attr = GetInputAttribute(index); + if (stage == ShaderStage::Geometry) { + attr = "gs_" + attr + "[]"; + } + code.AddLine("layout (location = " + std::to_string(idx) + ") " + + GetInputFlags(input_mode) + "in vec4 " + attr + ';'); + } + if (!attributes.empty()) + code.AddNewLine(); + } + + void DeclareOutputAttributes() { + const auto& attributes = ir.GetOutputAttributes(); + for (const auto index : attributes) { + if (index < Attribute::Index::Attribute_0 || index > Attribute::Index::Attribute_31) { + // Skip when it's not a generic attribute + continue; + } + // TODO(bunnei): Use proper number of elements for these + const auto idx = static_cast<u32>(index) - + static_cast<u32>(Attribute::Index::Attribute_0) + + GENERIC_VARYING_START_LOCATION; + code.AddLine("layout (location = " + std::to_string(idx) + ") out vec4 " + + GetOutputAttribute(index) + ';'); + } + if (!attributes.empty()) + code.AddNewLine(); + } + + void DeclareConstantBuffers() { + for (const auto& entry : ir.GetConstantBuffers()) { + const auto [index, size] = entry; + code.AddLine("layout (std140) uniform " + GetConstBufferBlock(index) + " {"); + code.AddLine(" vec4 " + GetConstBuffer(index) + "[MAX_CONSTBUFFER_ELEMENTS];"); + code.AddLine("};"); + code.AddNewLine(); + } + } + + void DeclareSamplers() { + const auto& samplers = ir.GetSamplers(); + for (const auto& sampler : samplers) { + std::string sampler_type = [&]() { + switch (sampler.GetType()) { + case Tegra::Shader::TextureType::Texture1D: + return "sampler1D"; + case Tegra::Shader::TextureType::Texture2D: + return "sampler2D"; + case Tegra::Shader::TextureType::Texture3D: + return "sampler3D"; + case Tegra::Shader::TextureType::TextureCube: + return "samplerCube"; + default: + UNREACHABLE(); + } + }(); + if (sampler.IsArray()) + sampler_type += "Array"; + if (sampler.IsShadow()) + sampler_type += "Shadow"; + + code.AddLine("uniform " + sampler_type + ' ' + GetSampler(sampler) + ';'); + } + if (!samplers.empty()) + code.AddNewLine(); + } + + void VisitBasicBlock(const BasicBlock& bb) { + for (const Node node : bb) { + if (const std::string expr = Visit(node); !expr.empty()) { + code.AddLine(expr); + } + } + } + + std::string Visit(Node node) { + if (const auto operation = std::get_if<OperationNode>(node)) { + const auto operation_index = static_cast<std::size_t>(operation->GetCode()); + const auto decompiler = operation_decompilers[operation_index]; + if (decompiler == nullptr) { + UNREACHABLE_MSG("Operation decompiler {} not defined", operation_index); + } + return (this->*decompiler)(*operation); + + } else if (const auto gpr = std::get_if<GprNode>(node)) { + const u32 index = gpr->GetIndex(); + if (index == RZ) { + return "0"; + } + return GetRegister(index); + + } else if (const auto immediate = std::get_if<ImmediateNode>(node)) { + const u32 value = immediate->GetValue(); + if (value < 10) { + // For eyecandy avoid using hex numbers on single digits + return fmt::format("utof({}u)", immediate->GetValue()); + } + return fmt::format("utof(0x{:x}u)", immediate->GetValue()); + + } else if (const auto predicate = std::get_if<PredicateNode>(node)) { + const auto value = [&]() -> std::string { + switch (const auto index = predicate->GetIndex(); index) { + case Tegra::Shader::Pred::UnusedIndex: + return "true"; + case Tegra::Shader::Pred::NeverExecute: + return "false"; + default: + return GetPredicate(index); + } + }(); + if (predicate->IsNegated()) { + return "!(" + value + ')'; + } + return value; + + } else if (const auto abuf = std::get_if<AbufNode>(node)) { + const auto attribute = abuf->GetIndex(); + const auto element = abuf->GetElement(); + + switch (attribute) { + case Attribute::Index::Position: + return element == 3 ? "1.0f" : "gl_FragCoord" + GetSwizzle(element); + case Attribute::Index::PointCoord: + switch (element) { + case 0: + return "gl_PointCoord.x"; + case 1: + return "gl_PointCoord.y"; + case 2: + case 3: + return "0"; + } + UNREACHABLE(); + return "0"; + case Attribute::Index::TessCoordInstanceIDVertexID: + // TODO(Subv): Find out what the values are for the first two elements when inside a + // vertex shader, and what's the value of the fourth element when inside a Tess Eval + // shader. + ASSERT(stage == ShaderStage::Vertex); + switch (element) { + case 2: + // Config pack's first value is instance_id. + return "uintBitsToFloat(config_pack[0])"; + case 3: + return "uintBitsToFloat(gl_VertexID)"; + } + UNIMPLEMENTED_MSG("Unmanaged TessCoordInstanceIDVertexID element={}", element); + return "0"; + case Attribute::Index::FrontFacing: + // TODO(Subv): Find out what the values are for the other elements. + ASSERT(stage == ShaderStage::Fragment); + switch (element) { + case 3: + return "itof(gl_FrontFacing ? -1 : 0)"; + } + UNIMPLEMENTED_MSG("Unmanaged FrontFacing element={}", element); + return "0"; + default: + if (attribute >= Attribute::Index::Attribute_0 && + attribute <= Attribute::Index::Attribute_31) { + return GetInputAttribute(attribute) + GetSwizzle(abuf->GetElement()); + } + break; + } + UNIMPLEMENTED_MSG("Unhandled input attribute: {}", static_cast<u32>(attribute)); + + } else if (const auto cbuf = std::get_if<CbufNode>(node)) { + const Node offset = cbuf->GetOffset(); + if (const auto immediate = std::get_if<ImmediateNode>(offset)) { + // Direct access + const u32 offset_imm = immediate->GetValue(); + return fmt::format("{}[{}][{}]", GetConstBuffer(cbuf->GetIndex()), offset_imm / 4, + offset_imm % 4); + + } else if (std::holds_alternative<OperationNode>(*offset)) { + // Indirect access + const std::string final_offset = code.GenerateTemporal(); + code.AddLine("uint " + final_offset + " = (ftou(" + Visit(offset) + ") / 4) & " + + std::to_string(MAX_CONSTBUFFER_ELEMENTS - 1) + ';'); + return fmt::format("{}[{} / 4][{} % 4]", GetConstBuffer(cbuf->GetIndex()), + final_offset, final_offset); + + } else { + UNREACHABLE_MSG("Unmanaged offset node type"); + } + + } else if (const auto lmem = std::get_if<LmemNode>(node)) { + return fmt::format("{}[ftou({}) / 4]", GetLocalMemory(), Visit(lmem->GetAddress())); + + } else if (const auto internal_flag = std::get_if<InternalFlagNode>(node)) { + return GetInternalFlag(internal_flag->GetFlag()); + + } else if (const auto conditional = std::get_if<ConditionalNode>(node)) { + // It's invalid to call conditional on nested nodes, use an operation instead + code.AddLine("if (" + Visit(conditional->GetCondition()) + ") {"); + ++code.scope; + + VisitBasicBlock(conditional->GetCode()); + + --code.scope; + code.AddLine('}'); + return {}; + + } else if (const auto comment = std::get_if<CommentNode>(node)) { + return "// " + comment->GetText(); + } + UNREACHABLE(); + } + + std::string ApplyPrecise(Operation operation, const std::string& value) { + if (!IsPrecise(operation)) { + return value; + } + // There's a bug in NVidia's proprietary drivers that makes precise fail on fragment shaders + const std::string precise = stage != ShaderStage::Fragment ? "precise " : ""; + + const std::string temporal = code.GenerateTemporal(); + code.AddLine(precise + "float " + temporal + " = " + value + ';'); + return temporal; + } + + std::string VisitOperand(Operation operation, std::size_t operand_index) { + const auto& operand = operation[operand_index]; + const bool parent_precise = IsPrecise(operation); + const bool child_precise = IsPrecise(operand); + const bool child_trivial = !std::holds_alternative<OperationNode>(*operand); + if (!parent_precise || child_precise || child_trivial) { + return Visit(operand); + } + + const std::string temporal = code.GenerateTemporal(); + code.AddLine("float " + temporal + " = " + Visit(operand) + ';'); + return temporal; + } + + std::string VisitOperand(Operation operation, std::size_t operand_index, Type type) { + std::string value = VisitOperand(operation, operand_index); + + switch (type) { + case Type::Bool: + case Type::Float: + return value; + case Type::Int: + return "ftoi(" + value + ')'; + case Type::Uint: + return "ftou(" + value + ')'; + case Type::HalfFloat: + if (!std::holds_alternative<MetaHalfArithmetic>(operation.GetMeta())) { + value = "toHalf2(" + value + ')'; + } + + const auto& half_meta = std::get<MetaHalfArithmetic>(operation.GetMeta()); + switch (half_meta.types.at(operand_index)) { + case Tegra::Shader::HalfType::H0_H1: + return "toHalf2(" + value + ')'; + case Tegra::Shader::HalfType::F32: + return "vec2(" + value + ')'; + case Tegra::Shader::HalfType::H0_H0: + return "vec2(toHalf2(" + value + ")[0])"; + case Tegra::Shader::HalfType::H1_H1: + return "vec2(toHalf2(" + value + ")[1])"; + } + } + UNREACHABLE(); + } + + std::string BitwiseCastResult(std::string value, Type type, bool needs_parenthesis = false) { + switch (type) { + case Type::Bool: + case Type::Float: + if (needs_parenthesis) { + return '(' + value + ')'; + } + return value; + case Type::Int: + return "itof(" + value + ')'; + case Type::Uint: + return "utof(" + value + ')'; + case Type::HalfFloat: + return "fromHalf2(" + value + ')'; + } + UNREACHABLE(); + } + + std::string GenerateUnary(Operation operation, const std::string& func, Type result_type, + Type type_a, bool needs_parenthesis = true) { + return ApplyPrecise(operation, + BitwiseCastResult(func + '(' + VisitOperand(operation, 0, type_a) + ')', + result_type, needs_parenthesis)); + } + + std::string GenerateBinaryInfix(Operation operation, const std::string& func, Type result_type, + Type type_a, Type type_b) { + const std::string op_a = VisitOperand(operation, 0, type_a); + const std::string op_b = VisitOperand(operation, 1, type_b); + + return ApplyPrecise( + operation, BitwiseCastResult('(' + op_a + ' ' + func + ' ' + op_b + ')', result_type)); + } + + std::string GenerateBinaryCall(Operation operation, const std::string& func, Type result_type, + Type type_a, Type type_b) { + const std::string op_a = VisitOperand(operation, 0, type_a); + const std::string op_b = VisitOperand(operation, 1, type_b); + + return ApplyPrecise(operation, + BitwiseCastResult(func + '(' + op_a + ", " + op_b + ')', result_type)); + } + + std::string GenerateTernary(Operation operation, const std::string& func, Type result_type, + Type type_a, Type type_b, Type type_c) { + const std::string op_a = VisitOperand(operation, 0, type_a); + const std::string op_b = VisitOperand(operation, 1, type_b); + const std::string op_c = VisitOperand(operation, 2, type_c); + + return ApplyPrecise( + operation, + BitwiseCastResult(func + '(' + op_a + ", " + op_b + ", " + op_c + ')', result_type)); + } + + std::string GenerateQuaternary(Operation operation, const std::string& func, Type result_type, + Type type_a, Type type_b, Type type_c, Type type_d) { + const std::string op_a = VisitOperand(operation, 0, type_a); + const std::string op_b = VisitOperand(operation, 1, type_b); + const std::string op_c = VisitOperand(operation, 2, type_c); + const std::string op_d = VisitOperand(operation, 3, type_d); + + return ApplyPrecise(operation, BitwiseCastResult(func + '(' + op_a + ", " + op_b + ", " + + op_c + ", " + op_d + ')', + result_type)); + } + + std::string GenerateTexture(Operation operation, const std::string& func, + const std::string& extra_cast = "") { + constexpr std::array<const char*, 4> coord_constructors = {"float", "vec2", "vec3", "vec4"}; + + const auto& meta = std::get<MetaTexture>(operation.GetMeta()); + const auto count = static_cast<u32>(operation.GetOperandsCount()); + + std::string expr = func; + expr += '('; + expr += GetSampler(meta.sampler); + expr += ", "; + + expr += coord_constructors[meta.coords_count - 1]; + expr += '('; + for (u32 i = 0; i < count; ++i) { + const bool is_extra = i >= meta.coords_count; + const bool do_cast = is_extra && !extra_cast.empty(); + if (do_cast) { + expr += extra_cast; + expr += '('; + } + expr += Visit(operation[i]); + if (do_cast) { + expr += ')'; + } + if (i + 1 == meta.coords_count) { + expr += ')'; + } + if (i + 1 < count) { + expr += ", "; + } + } + expr += ')'; + return expr; + } + + std::string Assign(Operation operation) { + const Node dest = operation[0]; + const Node src = operation[1]; + + std::string target; + if (const auto gpr = std::get_if<GprNode>(dest)) { + if (gpr->GetIndex() == RZ) { + // Writing to RZ is a no op + return {}; + } + target = GetRegister(gpr->GetIndex()); + + } else if (const auto abuf = std::get_if<AbufNode>(dest)) { + target = [&]() -> std::string { + switch (const auto attribute = abuf->GetIndex(); abuf->GetIndex()) { + case Attribute::Index::Position: + return "position" + GetSwizzle(abuf->GetElement()); + case Attribute::Index::PointSize: + return "gl_PointSize"; + case Attribute::Index::ClipDistances0123: + return "gl_ClipDistance[" + std::to_string(abuf->GetElement()) + ']'; + case Attribute::Index::ClipDistances4567: + return "gl_ClipDistance[" + std::to_string(abuf->GetElement() + 4) + ']'; + default: + if (attribute >= Attribute::Index::Attribute_0 && + attribute <= Attribute::Index::Attribute_31) { + return GetOutputAttribute(attribute) + GetSwizzle(abuf->GetElement()); + } + UNIMPLEMENTED_MSG("Unhandled output attribute: {}", + static_cast<u32>(attribute)); + } + }(); + + } else if (const auto lmem = std::get_if<LmemNode>(dest)) { + target = GetLocalMemory() + "[ftou(" + Visit(lmem->GetAddress()) + ") / 4]"; + + } else { + UNREACHABLE_MSG("Assign called without a proper target"); + } + + code.AddLine(target + " = " + Visit(src) + ';'); + return {}; + } + + std::string AssignComposite(Operation operation) { + const auto& meta = std::get<MetaComponents>(operation.GetMeta()); + + const std::string composite = code.GenerateTemporal(); + code.AddLine("vec4 " + composite + " = " + Visit(operation[0]) + ';'); + + constexpr u32 composite_size = 4; + for (u32 i = 0; i < composite_size; ++i) { + const auto gpr = std::get<GprNode>(*operation[i + 1]).GetIndex(); + if (gpr == RZ) { + continue; + } + code.AddLine(GetRegister(gpr) + " = " + composite + + GetSwizzle(meta.GetSourceComponent(i)) + ';'); + } + return {}; + } + + std::string Composite(Operation operation) { + std::string value = "vec4("; + for (std::size_t i = 0; i < 4; ++i) { + value += Visit(operation[i]); + if (i < 3) + value += ", "; + } + value += ')'; + return value; + } + + template <Type type> + std::string Add(Operation operation) { + return GenerateBinaryInfix(operation, "+", type, type, type); + } + + template <Type type> + std::string Mul(Operation operation) { + return GenerateBinaryInfix(operation, "*", type, type, type); + } + + template <Type type> + std::string Div(Operation operation) { + return GenerateBinaryInfix(operation, "/", type, type, type); + } + + std::string FFma(Operation operation) { + return GenerateTernary(operation, "fma", Type::Float, Type::Float, Type::Float, + Type::Float); + } + + template <Type type> + std::string Negate(Operation operation) { + return GenerateUnary(operation, "-", type, type, true); + } + + template <Type type> + std::string Absolute(Operation operation) { + return GenerateUnary(operation, "abs", type, type, false); + } + + std::string FClamp(Operation operation) { + return GenerateTernary(operation, "clamp", Type::Float, Type::Float, Type::Float, + Type::Float); + } + + template <Type type> + std::string Min(Operation operation) { + return GenerateBinaryCall(operation, "min", type, type, type); + } + + template <Type type> + std::string Max(Operation operation) { + return GenerateBinaryCall(operation, "max", type, type, type); + } + + std::string Select(Operation operation) { + const std::string condition = Visit(operation[0]); + const std::string true_case = Visit(operation[1]); + const std::string false_case = Visit(operation[2]); + return ApplyPrecise(operation, + '(' + condition + " ? " + true_case + " : " + false_case + ')'); + } + + std::string FCos(Operation operation) { + return GenerateUnary(operation, "cos", Type::Float, Type::Float, false); + } + + std::string FSin(Operation operation) { + return GenerateUnary(operation, "sin", Type::Float, Type::Float, false); + } + + std::string FExp2(Operation operation) { + return GenerateUnary(operation, "exp2", Type::Float, Type::Float, false); + } + + std::string FLog2(Operation operation) { + return GenerateUnary(operation, "log2", Type::Float, Type::Float, false); + } + + std::string FInverseSqrt(Operation operation) { + return GenerateUnary(operation, "inversesqrt", Type::Float, Type::Float, false); + } + + std::string FSqrt(Operation operation) { + return GenerateUnary(operation, "sqrt", Type::Float, Type::Float, false); + } + + std::string FRoundEven(Operation operation) { + return GenerateUnary(operation, "roundEven", Type::Float, Type::Float, false); + } + + std::string FFloor(Operation operation) { + return GenerateUnary(operation, "floor", Type::Float, Type::Float, false); + } + + std::string FCeil(Operation operation) { + return GenerateUnary(operation, "ceil", Type::Float, Type::Float, false); + } + + std::string FTrunc(Operation operation) { + return GenerateUnary(operation, "trunc", Type::Float, Type::Float, false); + } + + template <Type type> + std::string FCastInteger(Operation operation) { + return GenerateUnary(operation, "float", Type::Float, type, false); + } + + std::string ICastFloat(Operation operation) { + return GenerateUnary(operation, "int", Type::Int, Type::Float, false); + } + + std::string ICastUnsigned(Operation operation) { + return GenerateUnary(operation, "int", Type::Int, Type::Uint, false); + } + + template <Type type> + std::string LogicalShiftLeft(Operation operation) { + return GenerateBinaryInfix(operation, "<<", type, type, Type::Uint); + } + + std::string ILogicalShiftRight(Operation operation) { + const std::string op_a = VisitOperand(operation, 0, Type::Uint); + const std::string op_b = VisitOperand(operation, 1, Type::Uint); + + return ApplyPrecise(operation, + BitwiseCastResult("int(" + op_a + " >> " + op_b + ')', Type::Int)); + } + + std::string IArithmeticShiftRight(Operation operation) { + return GenerateBinaryInfix(operation, ">>", Type::Int, Type::Int, Type::Uint); + } + + template <Type type> + std::string BitwiseAnd(Operation operation) { + return GenerateBinaryInfix(operation, "&", type, type, type); + } + + template <Type type> + std::string BitwiseOr(Operation operation) { + return GenerateBinaryInfix(operation, "|", type, type, type); + } + + template <Type type> + std::string BitwiseXor(Operation operation) { + return GenerateBinaryInfix(operation, "^", type, type, type); + } + + template <Type type> + std::string BitwiseNot(Operation operation) { + return GenerateUnary(operation, "~", type, type, false); + } + + std::string UCastFloat(Operation operation) { + return GenerateUnary(operation, "uint", Type::Uint, Type::Float, false); + } + + std::string UCastSigned(Operation operation) { + return GenerateUnary(operation, "uint", Type::Uint, Type::Int, false); + } + + std::string UShiftRight(Operation operation) { + return GenerateBinaryInfix(operation, ">>", Type::Uint, Type::Uint, Type::Uint); + } + + template <Type type> + std::string BitfieldInsert(Operation operation) { + return GenerateQuaternary(operation, "bitfieldInsert", type, type, type, Type::Int, + Type::Int); + } + + std::string HNegate(Operation operation) { + const auto GetNegate = [&](std::size_t index) -> std::string { + if (const auto pred = std::get_if<PredicateNode>(operation[index])) { + if (!pred->IsNegated()) { + switch (pred->GetIndex()) { + case Tegra::Shader::Pred::UnusedIndex: + return "-1"; + case Tegra::Shader::Pred::NeverExecute: + return "1"; + } + } + } + return VisitOperand(operation, index, Type::Bool) + " ? -1 : 1"; + }; + const std::string value = '(' + VisitOperand(operation, 0, Type::HalfFloat) + " * vec2(" + + GetNegate(1) + ", " + GetNegate(2) + "))"; + return BitwiseCastResult(value, Type::HalfFloat); + } + + std::string HMergeF32(Operation operation) { + return "float(toHalf2(" + Visit(operation[0]) + ")[0])"; + } + + std::string HMergeH0(Operation operation) { + return "fromHalf2(vec2(toHalf2(" + Visit(operation[0]) + ")[1], toHalf2(" + + Visit(operation[1]) + ")[0]))"; + } + + std::string HMergeH1(Operation operation) { + return "fromHalf2(vec2(toHalf2(" + Visit(operation[0]) + ")[0], toHalf2(" + + Visit(operation[1]) + ")[1]))"; + } + + template <Type type> + std::string LogicalLessThan(Operation operation) { + return GenerateBinaryInfix(operation, "<", Type::Bool, type, type); + } + + template <Type type> + std::string LogicalEqual(Operation operation) { + return GenerateBinaryInfix(operation, "==", Type::Bool, type, type); + } + + template <Type type> + std::string LogicalLessEqual(Operation operation) { + return GenerateBinaryInfix(operation, "<=", Type::Bool, type, type); + } + + template <Type type> + std::string LogicalGreaterThan(Operation operation) { + return GenerateBinaryInfix(operation, ">", Type::Bool, type, type); + } + + template <Type type> + std::string LogicalNotEqual(Operation operation) { + return GenerateBinaryInfix(operation, "!=", Type::Bool, type, type); + } + + template <Type type> + std::string LogicalGreaterEqual(Operation operation) { + return GenerateBinaryInfix(operation, ">=", Type::Bool, type, type); + } + + std::string LogicalFIsNan(Operation operation) { + return GenerateUnary(operation, "isnan", Type::Bool, Type::Float, false); + } + + std::string LogicalAssign(Operation operation) { + const Node dest = operation[0]; + const Node src = operation[1]; + + std::string target; + + if (const auto pred = std::get_if<PredicateNode>(dest)) { + ASSERT_MSG(!pred->IsNegated(), "Negating logical assignment"); + + const auto index = pred->GetIndex(); + switch (index) { + case Tegra::Shader::Pred::NeverExecute: + case Tegra::Shader::Pred::UnusedIndex: + // Writing to these predicates is a no-op + return {}; + } + target = GetPredicate(index); + } else if (const auto flag = std::get_if<InternalFlagNode>(dest)) { + target = GetInternalFlag(flag->GetFlag()); + } + + code.AddLine(target + " = " + Visit(src) + ';'); + return {}; + } + + std::string LogicalAnd(Operation operation) { + return GenerateBinaryInfix(operation, "&&", Type::Bool, Type::Bool, Type::Bool); + } + + std::string LogicalOr(Operation operation) { + return GenerateBinaryInfix(operation, "||", Type::Bool, Type::Bool, Type::Bool); + } + + std::string LogicalXor(Operation operation) { + return GenerateBinaryInfix(operation, "^^", Type::Bool, Type::Bool, Type::Bool); + } + + std::string LogicalNegate(Operation operation) { + return GenerateUnary(operation, "!", Type::Bool, Type::Bool, false); + } + + std::string LogicalHComparison(Operation operation, const std::string& func) { + const auto& meta = std::get<MetaHalfArithmetic>(operation.GetMeta()); + const std::string op_a = VisitOperand(operation, 0, Type::HalfFloat); + const std::string op_b = VisitOperand(operation, 1, Type::HalfFloat); + + std::string value = meta.and_comparison ? "all" : "any"; + value += '(' + func + '(' + op_a + ", " + op_b + "))"; + return value; + } + + std::string LogicalHLessThan(Operation operation) { + return LogicalHComparison(operation, "lessThan"); + } + + std::string LogicalHEqual(Operation operation) { + return LogicalHComparison(operation, "equal"); + } + + std::string LogicalHLessEqual(Operation operation) { + return LogicalHComparison(operation, "lessThanEqual"); + } + + std::string LogicalHGreaterThan(Operation operation) { + return LogicalHComparison(operation, "greaterThan"); + } + + std::string LogicalHNotEqual(Operation operation) { + return LogicalHComparison(operation, "notEqual"); + } + + std::string LogicalHGreaterEqual(Operation operation) { + return LogicalHComparison(operation, "greaterThanEqual"); + } + + std::string F4Texture(Operation operation) { + std::string expr = GenerateTexture(operation, "texture"); + if (std::get<MetaTexture>(operation.GetMeta()).sampler.IsShadow()) { + expr = "vec4(" + expr + ')'; + } + return expr; + } + + std::string F4TextureLod(Operation operation) { + std::string expr = GenerateTexture(operation, "textureLod"); + if (std::get<MetaTexture>(operation.GetMeta()).sampler.IsShadow()) { + expr = "vec4(" + expr + ')'; + } + return expr; + } + + std::string F4TextureGather(Operation operation) { + return GenerateTexture(operation, "textureGather", "int"); + } + + std::string F4TextureQueryDimensions(Operation operation) { + const auto& meta = std::get<MetaTexture>(operation.GetMeta()); + const std::string sampler = GetSampler(meta.sampler); + const std::string lod = VisitOperand(operation, 0, Type::Int); + + const std::string sizes = code.GenerateTemporal(); + code.AddLine("ivec2 " + sizes + " = textureSize(" + sampler + ", " + lod + ");"); + + const std::string mip_level = "textureQueryLevels(" + sampler + ')'; + + return "itof(ivec4(" + sizes + ", 0, " + mip_level + "))"; + } + + std::string F4TextureQueryLod(Operation operation) { + const std::string tmp = code.GenerateTemporal(); + code.AddLine("vec2 " + tmp + " = " + GenerateTexture(operation, "textureQueryLod") + + " * vec2(256);"); + + return "vec4(itof(int(" + tmp + ".y)), utof(uint(" + tmp + ".x)), 0, 0)"; + } + + std::string Ipa(Operation operation) { + const auto& attribute = operation[0]; + // TODO(Rodrigo): Special IPA attribute interactions + return Visit(attribute); + } + + std::string Bra(Operation operation) { + const auto target = std::get<ImmediateNode>(*operation[0]); + code.AddLine(fmt::format("jmp_to = 0x{:x}u;", target.GetValue())); + code.AddLine("break;"); + return {}; + } + + std::string PushFlowStack(Operation operation) { + const auto target = std::get<ImmediateNode>(*operation[0]); + code.AddLine(fmt::format("flow_stack[flow_stack_top] = 0x{:x}u;", target.GetValue())); + code.AddLine("flow_stack_top++;"); + return {}; + } + + std::string PopFlowStack(Operation operation) { + code.AddLine("flow_stack_top--;"); + code.AddLine("jmp_to = flow_stack[flow_stack_top];"); + code.AddLine("break;"); + return {}; + } + + std::string Exit(Operation operation) { + if (stage != ShaderStage::Fragment) { + code.AddLine("return;"); + return {}; + } + const auto& used_registers = ir.GetRegisters(); + const auto SafeGetRegister = [&](u32 reg) -> std::string { + // TODO(Rodrigo): Replace with contains once C++20 releases + if (used_registers.find(reg) != used_registers.end()) { + return GetRegister(reg); + } + return "0.0f"; + }; + + UNIMPLEMENTED_IF_MSG(header.ps.omap.sample_mask != 0, "Sample mask write is unimplemented"); + + code.AddLine("if (alpha_test[0] != 0) {"); + ++code.scope; + // We start on the register containing the alpha value in the first RT. + u32 current_reg = 3; + for (u32 render_target = 0; render_target < Maxwell::NumRenderTargets; ++render_target) { + // TODO(Blinkhawk): verify the behavior of alpha testing on hardware when + // multiple render targets are used. + if (header.ps.IsColorComponentOutputEnabled(render_target, 0) || + header.ps.IsColorComponentOutputEnabled(render_target, 1) || + header.ps.IsColorComponentOutputEnabled(render_target, 2) || + header.ps.IsColorComponentOutputEnabled(render_target, 3)) { + code.AddLine( + fmt::format("if (!AlphaFunc({})) discard;", SafeGetRegister(current_reg))); + current_reg += 4; + } + } + --code.scope; + code.AddLine('}'); + + // Write the color outputs using the data in the shader registers, disabled + // rendertargets/components are skipped in the register assignment. + current_reg = 0; + for (u32 render_target = 0; render_target < Maxwell::NumRenderTargets; ++render_target) { + // TODO(Subv): Figure out how dual-source blending is configured in the Switch. + for (u32 component = 0; component < 4; ++component) { + if (header.ps.IsColorComponentOutputEnabled(render_target, component)) { + code.AddLine(fmt::format("FragColor{}[{}] = {};", render_target, component, + SafeGetRegister(current_reg))); + ++current_reg; + } + } + } + + if (header.ps.omap.depth) { + // The depth output is always 2 registers after the last color output, and current_reg + // already contains one past the last color register. + code.AddLine("gl_FragDepth = " + SafeGetRegister(current_reg + 1) + ';'); + } + + code.AddLine("return;"); + return {}; + } + + std::string Kil(Operation operation) { + // Enclose "discard" in a conditional, so that GLSL compilation does not complain + // about unexecuted instructions that may follow this. + code.AddLine("if (true) {"); + ++code.scope; + code.AddLine("discard;"); + --code.scope; + code.AddLine("}"); + return {}; + } + + std::string YNegate(Operation operation) { + // Config pack's third value is Y_NEGATE's state. + return "uintBitsToFloat(config_pack[2])"; + } + + static constexpr OperationDecompilersArray operation_decompilers = { + &Assign, + &AssignComposite, + + &Composite, + &Select, + + &Add<Type::Float>, + &Mul<Type::Float>, + &Div<Type::Float>, + &FFma, + &Negate<Type::Float>, + &Absolute<Type::Float>, + &FClamp, + &Min<Type::Float>, + &Max<Type::Float>, + &FCos, + &FSin, + &FExp2, + &FLog2, + &FInverseSqrt, + &FSqrt, + &FRoundEven, + &FFloor, + &FCeil, + &FTrunc, + &FCastInteger<Type::Int>, + &FCastInteger<Type::Uint>, + + &Add<Type::Int>, + &Mul<Type::Int>, + &Div<Type::Int>, + &Negate<Type::Int>, + &Absolute<Type::Int>, + &Min<Type::Int>, + &Max<Type::Int>, + + &ICastFloat, + &ICastUnsigned, + &LogicalShiftLeft<Type::Int>, + &ILogicalShiftRight, + &IArithmeticShiftRight, + &BitwiseAnd<Type::Int>, + &BitwiseOr<Type::Int>, + &BitwiseXor<Type::Int>, + &BitwiseNot<Type::Int>, + &BitfieldInsert<Type::Int>, + + &Add<Type::Uint>, + &Mul<Type::Uint>, + &Div<Type::Uint>, + &Min<Type::Uint>, + &Max<Type::Uint>, + &UCastFloat, + &UCastSigned, + &LogicalShiftLeft<Type::Uint>, + &UShiftRight, + &UShiftRight, + &BitwiseAnd<Type::Uint>, + &BitwiseOr<Type::Uint>, + &BitwiseXor<Type::Uint>, + &BitwiseNot<Type::Uint>, + &BitfieldInsert<Type::Uint>, + + &Add<Type::HalfFloat>, + &Mul<Type::HalfFloat>, + &Absolute<Type::HalfFloat>, + &HNegate, + &HMergeF32, + &HMergeH0, + &HMergeH1, + + &LogicalAssign, + &LogicalAnd, + &LogicalOr, + &LogicalXor, + &LogicalNegate, + + &LogicalLessThan<Type::Float>, + &LogicalEqual<Type::Float>, + &LogicalLessEqual<Type::Float>, + &LogicalGreaterThan<Type::Float>, + &LogicalNotEqual<Type::Float>, + &LogicalGreaterEqual<Type::Float>, + &LogicalFIsNan, + + &LogicalLessThan<Type::Int>, + &LogicalEqual<Type::Int>, + &LogicalLessEqual<Type::Int>, + &LogicalGreaterThan<Type::Int>, + &LogicalNotEqual<Type::Int>, + &LogicalGreaterEqual<Type::Int>, + + &LogicalLessThan<Type::Uint>, + &LogicalEqual<Type::Uint>, + &LogicalLessEqual<Type::Uint>, + &LogicalGreaterThan<Type::Uint>, + &LogicalNotEqual<Type::Uint>, + &LogicalGreaterEqual<Type::Uint>, + + &LogicalHLessThan, + &LogicalHEqual, + &LogicalHLessEqual, + &LogicalHGreaterThan, + &LogicalHNotEqual, + &LogicalHGreaterEqual, + + &F4Texture, + &F4TextureLod, + &F4TextureGather, + &F4TextureQueryDimensions, + &F4TextureQueryLod, + + &Ipa, + + &Bra, + &PushFlowStack, // Ssy + &PushFlowStack, // Brk + &PopFlowStack, // Sync + &PopFlowStack, // Brk + &Exit, + &Kil, + + &YNegate, + }; + + std::string GetRegister(u32 index) const { + return GetDeclarationWithSuffix(index, "gpr"); + } + + std::string GetPredicate(Tegra::Shader::Pred pred) const { + return GetDeclarationWithSuffix(static_cast<u32>(pred), "pred"); + } + + std::string GetInputAttribute(Attribute::Index attribute) const { + const auto index{static_cast<u32>(attribute) - + static_cast<u32>(Attribute::Index::Attribute_0)}; + return GetDeclarationWithSuffix(index, "input_attr"); + } + + std::string GetOutputAttribute(Attribute::Index attribute) const { + const auto index{static_cast<u32>(attribute) - + static_cast<u32>(Attribute::Index::Attribute_0)}; + return GetDeclarationWithSuffix(index, "output_attr"); + } + + std::string GetConstBuffer(u32 index) const { + return GetDeclarationWithSuffix(index, "cbuf"); + } + + std::string GetConstBufferBlock(u32 index) const { + return GetDeclarationWithSuffix(index, "cbuf_block"); + } + + std::string GetLocalMemory() const { + return "lmem_" + suffix; + } + + std::string GetInternalFlag(InternalFlag flag) const { + constexpr std::array<const char*, 4> InternalFlagNames = {"zero_flag", "sign_flag", + "carry_flag", "overflow_flag"}; + const auto index = static_cast<u32>(flag); + ASSERT(index < static_cast<u32>(InternalFlag::Amount)); + + return std::string(InternalFlagNames[index]) + '_' + suffix; + } + + std::string GetSampler(const Sampler& sampler) const { + return GetDeclarationWithSuffix(sampler.GetIndex(), "sampler"); + } + + std::string GetDeclarationWithSuffix(u32 index, const std::string& name) const { + return name + '_' + std::to_string(index) + '_' + suffix; + } + + const ShaderIR& ir; + const ShaderStage stage; + const std::string suffix; + const Header header; + + ShaderWriter code; +}; + +std::string GetCommonDeclarations() { + return "#define MAX_CONSTBUFFER_ELEMENTS " + std::to_string(MAX_CONSTBUFFER_ELEMENTS) + + "\n" + "#define ftoi floatBitsToInt\n" + "#define ftou floatBitsToUint\n" + "#define itof intBitsToFloat\n" + "#define utof uintBitsToFloat\n\n" + "float fromHalf2(vec2 pair) {\n" + " return utof(packHalf2x16(pair));\n" + "}\n\n" + "vec2 toHalf2(float value) {\n" + " return unpackHalf2x16(ftou(value));\n" + "}\n\n"; +} + +ProgramResult Decompile(const ShaderIR& ir, Maxwell::ShaderStage stage, const std::string& suffix) { + GLSLDecompiler decompiler(ir, stage, suffix); + decompiler.Decompile(); + return {decompiler.GetResult(), decompiler.GetShaderEntries()}; +} + +} // namespace OpenGL::GLShader
\ No newline at end of file diff --git a/src/video_core/shader/glsl_decompiler.h b/src/video_core/shader/glsl_decompiler.h new file mode 100644 index 000000000..7be461f1b --- /dev/null +++ b/src/video_core/shader/glsl_decompiler.h @@ -0,0 +1,88 @@ +// Copyright 2018 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#pragma once + +#include <array> +#include <string> +#include <utility> +#include <vector> +#include "common/common_types.h" +#include "video_core/engines/maxwell_3d.h" +#include "video_core/shader/shader_ir.h" + +namespace VideoCommon::Shader { +class ShaderIR; +} + +namespace OpenGL::GLShader { + +using Maxwell = Tegra::Engines::Maxwell3D::Regs; + +class ConstBufferEntry : public VideoCommon::Shader::ConstBuffer { +public: + explicit ConstBufferEntry(const VideoCommon::Shader::ConstBuffer& entry, + Maxwell::ShaderStage stage, const std::string& name, u32 index) + : VideoCommon::Shader::ConstBuffer{entry}, stage{stage}, name{name}, index{index} {} + + const std::string& GetName() const { + return name; + } + + Maxwell::ShaderStage GetStage() const { + return stage; + } + + u32 GetIndex() const { + return index; + } + + u32 GetHash() const { + return (static_cast<u32>(stage) << 16) | index; + } + +private: + std::string name; + Maxwell::ShaderStage stage{}; + u32 index{}; +}; + +class SamplerEntry : public VideoCommon::Shader::Sampler { +public: + explicit SamplerEntry(const VideoCommon::Shader::Sampler& entry, Maxwell::ShaderStage stage, + const std::string& name) + : VideoCommon::Shader::Sampler{entry}, stage{stage}, name{name} {} + + const std::string& GetName() const { + return name; + } + + Maxwell::ShaderStage GetStage() const { + return stage; + } + + u32 GetHash() const { + return (static_cast<u32>(stage) << 16) | GetIndex(); + } + +private: + std::string name; + Maxwell::ShaderStage stage{}; +}; + +struct ShaderEntries { + std::vector<ConstBufferEntry> const_buffers; + std::vector<SamplerEntry> samplers; + std::array<bool, Maxwell::NumClipDistances> clip_distances{}; + std::size_t shader_length{}; +}; + +using ProgramResult = std::pair<std::string, ShaderEntries>; + +std::string GetCommonDeclarations(); + +ProgramResult Decompile(const VideoCommon::Shader::ShaderIR& ir, Maxwell::ShaderStage stage, + const std::string& suffix); + +} // namespace OpenGL::GLShader
\ No newline at end of file |