diff options
Diffstat (limited to '')
| -rw-r--r-- | src/video_core/renderer_opengl/gl_shader_decompiler.cpp | 791 |
1 files changed, 756 insertions, 35 deletions
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp index 564ea8f9e..086424395 100644 --- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp +++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp @@ -2,57 +2,778 @@ // Licensed under GPLv2 or any later version // Refer to the license.txt file included. +#include <map> +#include <set> #include <string> -#include <queue> +#include <string_view> #include "common/assert.h" #include "common/common_types.h" +#include "video_core/engines/shader_bytecode.h" #include "video_core/renderer_opengl/gl_shader_decompiler.h" -namespace Maxwell3D { -namespace Shader { +namespace GLShader { namespace Decompiler { +using Tegra::Shader::Attribute; +using Tegra::Shader::Instruction; +using Tegra::Shader::OpCode; +using Tegra::Shader::Register; +using Tegra::Shader::Sampler; +using Tegra::Shader::SubOp; +using Tegra::Shader::Uniform; + constexpr u32 PROGRAM_END = MAX_PROGRAM_CODE_LENGTH; -class Impl { +class DecompileFail : public std::runtime_error { +public: + using std::runtime_error::runtime_error; +}; + +/// Describes the behaviour of code path of a given entry point and a return point. +enum class ExitMethod { + Undetermined, ///< Internal value. Only occur when analyzing JMP loop. + AlwaysReturn, ///< All code paths reach the return point. + Conditional, ///< Code path reaches the return point or an END instruction conditionally. + AlwaysEnd, ///< All code paths reach a END instruction. +}; + +/// A subroutine is a range of code refereced by a CALL, IF or LOOP instruction. +struct Subroutine { + /// Generates a name suitable for GLSL source code. + std::string GetName() const { + return "sub_" + std::to_string(begin) + "_" + std::to_string(end); + } + + u32 begin; ///< Entry point of the subroutine. + u32 end; ///< Return point of the subroutine. + ExitMethod exit_method; ///< Exit method of the subroutine. + std::set<u32> labels; ///< Addresses refereced by JMP instructions. + + bool operator<(const Subroutine& rhs) const { + return std::tie(begin, end) < std::tie(rhs.begin, rhs.end); + } +}; + +/// Analyzes shader code and produces a set of subroutines. +class ControlFlowAnalyzer { public: - Impl(const std::array<u32, MAX_PROGRAM_CODE_LENGTH>& program_code, - const std::array<u32, MAX_SWIZZLE_DATA_LENGTH>& swizzle_data, u32 main_offset, - const std::function<std::string(u32)>& inputreg_getter, - const std::function<std::string(u32)>& outputreg_getter, bool sanitize_mul, - const std::string& emit_cb, const std::string& setemit_cb) - : program_code(program_code), swizzle_data(swizzle_data), main_offset(main_offset), - inputreg_getter(inputreg_getter), outputreg_getter(outputreg_getter), - sanitize_mul(sanitize_mul), emit_cb(emit_cb), setemit_cb(setemit_cb) {} + ControlFlowAnalyzer(const ProgramCode& program_code, u32 main_offset) + : program_code(program_code) { + + // Recursively finds all subroutines. + const Subroutine& program_main = AddSubroutine(main_offset, PROGRAM_END); + if (program_main.exit_method != ExitMethod::AlwaysEnd) + throw DecompileFail("Program does not always end"); + } - std::string Decompile() { - UNREACHABLE(); - return {}; + std::set<Subroutine> GetSubroutines() { + return std::move(subroutines); } private: - const std::array<u32, MAX_PROGRAM_CODE_LENGTH>& program_code; - const std::array<u32, MAX_SWIZZLE_DATA_LENGTH>& swizzle_data; - u32 main_offset; - const std::function<std::string(u32)>& inputreg_getter; - const std::function<std::string(u32)>& outputreg_getter; - bool sanitize_mul; - const std::string& emit_cb; - const std::string& setemit_cb; + const ProgramCode& program_code; + std::set<Subroutine> subroutines; + std::map<std::pair<u32, u32>, ExitMethod> exit_method_map; + + /// Adds and analyzes a new subroutine if it is not added yet. + const Subroutine& AddSubroutine(u32 begin, u32 end) { + auto iter = subroutines.find(Subroutine{begin, end}); + if (iter != subroutines.end()) + return *iter; + + Subroutine subroutine{begin, end}; + subroutine.exit_method = Scan(begin, end, subroutine.labels); + if (subroutine.exit_method == ExitMethod::Undetermined) + throw DecompileFail("Recursive function detected"); + return *subroutines.insert(std::move(subroutine)).first; + } + + /// Scans a range of code for labels and determines the exit method. + ExitMethod Scan(u32 begin, u32 end, std::set<u32>& labels) { + auto [iter, inserted] = + exit_method_map.emplace(std::make_pair(begin, end), ExitMethod::Undetermined); + ExitMethod& exit_method = iter->second; + if (!inserted) + return exit_method; + + for (u32 offset = begin; offset != end && offset != PROGRAM_END; ++offset) { + if (const auto opcode = OpCode::Decode({program_code[offset]})) { + switch (opcode->GetId()) { + case OpCode::Id::EXIT: { + return exit_method = ExitMethod::AlwaysEnd; + } + } + } + } + return exit_method = ExitMethod::AlwaysReturn; + } +}; + +class ShaderWriter { +public: + void AddLine(std::string_view text) { + DEBUG_ASSERT(scope >= 0); + if (!text.empty()) { + AppendIndentation(); + } + shader_source += 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 GetResult() { + return std::move(shader_source); + } + + int scope = 0; + +private: + void AppendIndentation() { + shader_source.append(static_cast<size_t>(scope) * 4, ' '); + } + + std::string shader_source; }; -std::string DecompileProgram(const std::array<u32, MAX_PROGRAM_CODE_LENGTH>& program_code, - const std::array<u32, MAX_SWIZZLE_DATA_LENGTH>& swizzle_data, - u32 main_offset, - const std::function<std::string(u32)>& inputreg_getter, - const std::function<std::string(u32)>& outputreg_getter, - bool sanitize_mul, const std::string& emit_cb, - const std::string& setemit_cb) { - Impl impl(program_code, swizzle_data, main_offset, inputreg_getter, outputreg_getter, - sanitize_mul, emit_cb, setemit_cb); - return impl.Decompile(); +class GLSLGenerator { +public: + GLSLGenerator(const std::set<Subroutine>& subroutines, const ProgramCode& program_code, + u32 main_offset, Maxwell3D::Regs::ShaderStage stage) + : subroutines(subroutines), program_code(program_code), main_offset(main_offset), + stage(stage) { + + Generate(); + } + + std::string GetShaderCode() { + return declarations.GetResult() + shader.GetResult(); + } + + /// Returns entries in the shader that are useful for external functions + ShaderEntries GetEntries() const { + return {GetConstBuffersDeclarations()}; + } + +private: + /// Gets the Subroutine object corresponding to the specified address. + const Subroutine& GetSubroutine(u32 begin, u32 end) const { + auto iter = subroutines.find(Subroutine{begin, end}); + ASSERT(iter != subroutines.end()); + return *iter; + } + + /// Generates code representing an input attribute register. + std::string GetInputAttribute(Attribute::Index attribute) { + switch (attribute) { + case Attribute::Index::Position: + return "position"; + default: + const u32 index{static_cast<u32>(attribute) - + static_cast<u32>(Attribute::Index::Attribute_0)}; + if (attribute >= Attribute::Index::Attribute_0) { + declr_input_attribute.insert(attribute); + return "input_attribute_" + std::to_string(index); + } + + NGLOG_CRITICAL(HW_GPU, "Unhandled input attribute: {}", index); + UNREACHABLE(); + } + } + + /// Generates code representing an output attribute register. + std::string GetOutputAttribute(Attribute::Index attribute) { + switch (attribute) { + case Attribute::Index::Position: + return "position"; + default: + const u32 index{static_cast<u32>(attribute) - + static_cast<u32>(Attribute::Index::Attribute_0)}; + if (attribute >= Attribute::Index::Attribute_0) { + declr_output_attribute.insert(attribute); + return "output_attribute_" + std::to_string(index); + } + + NGLOG_CRITICAL(HW_GPU, "Unhandled output attribute: {}", index); + UNREACHABLE(); + } + } + + /// Generates code representing a 19-bit immediate value + static std::string GetImmediate19(const Instruction& instr) { + return std::to_string(instr.alu.GetImm20_19()); + } + + /// Generates code representing a 32-bit immediate value + static std::string GetImmediate32(const Instruction& instr) { + return std::to_string(instr.alu.GetImm20_32()); + } + + /// Generates code representing a temporary (GPR) register. + std::string GetRegister(const Register& reg, unsigned elem = 0) { + if (reg == Register::ZeroIndex) + return "0"; + if (stage == Maxwell3D::Regs::ShaderStage::Fragment && reg < 4) { + // GPRs 0-3 are output color for the fragment shader + return std::string{"color."} + "rgba"[(reg + elem) & 3]; + } + + return *declr_register.insert("register_" + std::to_string(reg + elem)).first; + } + + /// Generates code representing a uniform (C buffer) register. + std::string GetUniform(const Uniform& reg) { + declr_const_buffers[reg.index].MarkAsUsed(static_cast<unsigned>(reg.index), + static_cast<unsigned>(reg.offset), stage); + return 'c' + std::to_string(reg.index) + '[' + std::to_string(reg.offset) + ']'; + } + + /// Generates code representing a texture sampler. + std::string GetSampler(const Sampler& sampler) const { + // TODO(Subv): Support more than just texture sampler 0 + ASSERT_MSG(sampler.index == Sampler::Index::Sampler_0, "unsupported"); + const unsigned index{static_cast<unsigned>(sampler.index.Value()) - + static_cast<unsigned>(Sampler::Index::Sampler_0)}; + return "tex[" + std::to_string(index) + "]"; + } + + /** + * Adds code that calls a subroutine. + * @param subroutine the subroutine to call. + */ + void CallSubroutine(const Subroutine& subroutine) { + if (subroutine.exit_method == ExitMethod::AlwaysEnd) { + shader.AddLine(subroutine.GetName() + "();"); + shader.AddLine("return true;"); + } else if (subroutine.exit_method == ExitMethod::Conditional) { + shader.AddLine("if (" + subroutine.GetName() + "()) { return true; }"); + } else { + shader.AddLine(subroutine.GetName() + "();"); + } + } + + /** + * Writes code that does an assignment operation. + * @param reg the destination register code. + * @param value the code representing the value to assign. + */ + void SetDest(u64 elem, const std::string& reg, const std::string& value, + u64 dest_num_components, u64 value_num_components, bool is_abs = false) { + std::string swizzle = "."; + swizzle += "xyzw"[elem]; + + std::string dest = reg + (dest_num_components != 1 ? swizzle : ""); + std::string src = "(" + value + ")" + (value_num_components != 1 ? swizzle : ""); + src = is_abs ? "abs(" + src + ")" : src; + + shader.AddLine(dest + " = " + src + ";"); + } + + /* + * Writes code that assigns a predicate boolean variable. + * @param pred The id of the predicate to write to. + * @param value The expression value to assign to the predicate. + */ + void SetPredicate(u64 pred, const std::string& value) { + using Tegra::Shader::Pred; + // Can't assign to the constant predicate. + ASSERT(pred != static_cast<u64>(Pred::UnusedIndex)); + + std::string variable = 'p' + std::to_string(pred); + shader.AddLine(variable + " = " + value + ';'); + declr_predicates.insert(std::move(variable)); + } + + /* + * Returns the condition to use in the 'if' for a predicated instruction. + * @param instr Instruction to generate the if condition for. + * @returns string containing the predicate condition. + */ + std::string GetPredicateCondition(Instruction instr) const { + using Tegra::Shader::Pred; + ASSERT(instr.pred.pred_index != static_cast<u64>(Pred::UnusedIndex)); + + std::string variable = + 'p' + std::to_string(static_cast<u64>(instr.pred.pred_index.Value())); + + if (instr.negate_pred) { + return "!(" + variable + ')'; + } + + return variable; + } + + /* + * Returns whether the instruction at the specified offset is a 'sched' instruction. + * Sched instructions always appear before a sequence of 3 instructions. + */ + bool IsSchedInstruction(u32 offset) const { + // sched instructions appear once every 4 instructions. + static constexpr size_t SchedPeriod = 4; + u32 absolute_offset = offset - main_offset; + + return (absolute_offset % SchedPeriod) == 0; + } + + /** + * Compiles a single instruction from Tegra to GLSL. + * @param offset the offset of the Tegra shader instruction. + * @return the offset of the next instruction to execute. Usually it is the current offset + * + 1. If the current instruction always terminates the program, returns PROGRAM_END. + */ + u32 CompileInstr(u32 offset) { + // Ignore sched instructions when generating code. + if (IsSchedInstruction(offset)) { + return offset + 1; + } + + const Instruction instr = {program_code[offset]}; + const auto opcode = OpCode::Decode(instr); + + // Decoding failure + if (!opcode) { + NGLOG_CRITICAL(HW_GPU, "Unhandled instruction: {0:x}", instr.value); + UNREACHABLE(); + } + + shader.AddLine("// " + std::to_string(offset) + ": " + opcode->GetName()); + + using Tegra::Shader::Pred; + ASSERT_MSG(instr.pred.full_pred != Pred::NeverExecute, + "NeverExecute predicate not implemented"); + + if (instr.pred.pred_index != static_cast<u64>(Pred::UnusedIndex)) { + shader.AddLine("if (" + GetPredicateCondition(instr) + ')'); + shader.AddLine('{'); + ++shader.scope; + } + + switch (opcode->GetType()) { + case OpCode::Type::Arithmetic: { + std::string dest = GetRegister(instr.gpr0); + std::string op_a = instr.alu.negate_a ? "-" : ""; + op_a += GetRegister(instr.gpr8); + if (instr.alu.abs_a) { + op_a = "abs(" + op_a + ")"; + } + + std::string op_b = instr.alu.negate_b ? "-" : ""; + + if (instr.is_b_imm) { + op_b += GetImmediate19(instr); + } else { + if (instr.is_b_gpr) { + op_b += GetRegister(instr.gpr20); + } else { + op_b += GetUniform(instr.uniform); + } + } + + if (instr.alu.abs_b) { + op_b = "abs(" + op_b + ")"; + } + + switch (opcode->GetId()) { + case OpCode::Id::FMUL_C: + case OpCode::Id::FMUL_R: + case OpCode::Id::FMUL_IMM: { + SetDest(0, dest, op_a + " * " + op_b, 1, 1, instr.alu.abs_d); + break; + } + case OpCode::Id::FMUL32_IMM: { + // fmul32i doesn't have abs or neg bits. + SetDest(0, dest, GetRegister(instr.gpr8) + " * " + GetImmediate32(instr), 1, 1); + break; + } + case OpCode::Id::FADD_C: + case OpCode::Id::FADD_R: + case OpCode::Id::FADD_IMM: { + SetDest(0, dest, op_a + " + " + op_b, 1, 1, instr.alu.abs_d); + break; + } + case OpCode::Id::MUFU: { + switch (instr.sub_op) { + case SubOp::Cos: + SetDest(0, dest, "cos(" + op_a + ")", 1, 1, instr.alu.abs_d); + break; + case SubOp::Sin: + SetDest(0, dest, "sin(" + op_a + ")", 1, 1, instr.alu.abs_d); + break; + case SubOp::Ex2: + SetDest(0, dest, "exp2(" + op_a + ")", 1, 1, instr.alu.abs_d); + break; + case SubOp::Lg2: + SetDest(0, dest, "log2(" + op_a + ")", 1, 1, instr.alu.abs_d); + break; + case SubOp::Rcp: + SetDest(0, dest, "1.0 / " + op_a, 1, 1, instr.alu.abs_d); + break; + case SubOp::Rsq: + SetDest(0, dest, "inversesqrt(" + op_a + ")", 1, 1, instr.alu.abs_d); + break; + case SubOp::Min: + SetDest(0, dest, "min(" + op_a + "," + op_b + ")", 1, 1, instr.alu.abs_d); + break; + default: + NGLOG_CRITICAL(HW_GPU, "Unhandled MUFU sub op: {0:x}", + static_cast<unsigned>(instr.sub_op.Value())); + UNREACHABLE(); + } + break; + } + case OpCode::Id::RRO: { + NGLOG_DEBUG(HW_GPU, "Skipping RRO instruction"); + break; + } + default: { + NGLOG_CRITICAL(HW_GPU, "Unhandled arithmetic instruction: {}", opcode->GetName()); + UNREACHABLE(); + } + } + break; + } + case OpCode::Type::Ffma: { + std::string dest = GetRegister(instr.gpr0); + std::string op_a = GetRegister(instr.gpr8); + std::string op_b = instr.ffma.negate_b ? "-" : ""; + std::string op_c = instr.ffma.negate_c ? "-" : ""; + + switch (opcode->GetId()) { + case OpCode::Id::FFMA_CR: { + op_b += GetUniform(instr.uniform); + op_c += GetRegister(instr.gpr39); + break; + } + case OpCode::Id::FFMA_RR: { + op_b += GetRegister(instr.gpr20); + op_c += GetRegister(instr.gpr39); + break; + } + case OpCode::Id::FFMA_RC: { + op_b += GetRegister(instr.gpr39); + op_c += GetUniform(instr.uniform); + break; + } + case OpCode::Id::FFMA_IMM: { + op_b += GetImmediate19(instr); + op_c += GetRegister(instr.gpr39); + break; + } + default: { + NGLOG_CRITICAL(HW_GPU, "Unhandled FFMA instruction: {}", opcode->GetName()); + UNREACHABLE(); + } + } + + SetDest(0, dest, op_a + " * " + op_b + " + " + op_c, 1, 1); + break; + } + case OpCode::Type::Memory: { + std::string gpr0 = GetRegister(instr.gpr0); + const Attribute::Index attribute = instr.attribute.fmt20.index; + + switch (opcode->GetId()) { + case OpCode::Id::LD_A: { + ASSERT_MSG(instr.attribute.fmt20.size == 0, "untested"); + SetDest(instr.attribute.fmt20.element, gpr0, GetInputAttribute(attribute), 1, 4); + break; + } + case OpCode::Id::ST_A: { + ASSERT_MSG(instr.attribute.fmt20.size == 0, "untested"); + SetDest(instr.attribute.fmt20.element, GetOutputAttribute(attribute), gpr0, 4, 1); + break; + } + case OpCode::Id::TEXS: { + ASSERT_MSG(instr.attribute.fmt20.size == 4, "untested"); + const std::string op_a = GetRegister(instr.gpr8); + const std::string op_b = GetRegister(instr.gpr20); + const std::string sampler = GetSampler(instr.sampler); + const std::string coord = "vec2 coords = vec2(" + op_a + ", " + op_b + ");"; + // Add an extra scope and declare the texture coords inside to prevent overwriting + // them in case they are used as outputs of the texs instruction. + shader.AddLine("{"); + ++shader.scope; + shader.AddLine(coord); + const std::string texture = "texture(" + sampler + ", coords)"; + for (unsigned elem = 0; elem < instr.attribute.fmt20.size; ++elem) { + SetDest(elem, GetRegister(instr.gpr0, elem), texture, 1, 4); + } + --shader.scope; + shader.AddLine("}"); + break; + } + default: { + NGLOG_CRITICAL(HW_GPU, "Unhandled memory instruction: {}", opcode->GetName()); + UNREACHABLE(); + } + } + break; + } + case OpCode::Type::FloatPredicate: { + std::string op_a = instr.fsetp.neg_a ? "-" : ""; + op_a += GetRegister(instr.gpr8); + + if (instr.fsetp.abs_a) { + op_a = "abs(" + op_a + ')'; + } + + std::string op_b{}; + + if (instr.is_b_imm) { + if (instr.fsetp.neg_b) { + // Only the immediate version of fsetp has a neg_b bit. + op_b += '-'; + } + op_b += '(' + GetImmediate19(instr) + ')'; + } else { + if (instr.is_b_gpr) { + op_b += GetRegister(instr.gpr20); + } else { + op_b += GetUniform(instr.uniform); + } + } + + if (instr.fsetp.abs_b) { + op_b = "abs(" + op_b + ')'; + } + + using Tegra::Shader::Pred; + ASSERT_MSG(instr.fsetp.pred0 == static_cast<u64>(Pred::UnusedIndex) && + instr.fsetp.pred39 == static_cast<u64>(Pred::UnusedIndex), + "Compound predicates are not implemented"); + + // We can't use the constant predicate as destination. + ASSERT(instr.fsetp.pred3 != static_cast<u64>(Pred::UnusedIndex)); + + using Tegra::Shader::PredCondition; + switch (instr.fsetp.cond) { + case PredCondition::LessThan: + SetPredicate(instr.fsetp.pred3, '(' + op_a + ") < (" + op_b + ')'); + break; + case PredCondition::Equal: + SetPredicate(instr.fsetp.pred3, '(' + op_a + ") == (" + op_b + ')'); + break; + default: + NGLOG_CRITICAL(HW_GPU, "Unhandled predicate condition: {} (a: {}, b: {})", + static_cast<unsigned>(instr.fsetp.cond.Value()), op_a, op_b); + UNREACHABLE(); + } + break; + } + default: { + switch (opcode->GetId()) { + case OpCode::Id::EXIT: { + ASSERT_MSG(instr.pred.pred_index == static_cast<u64>(Pred::UnusedIndex), + "Predicated exits not implemented"); + shader.AddLine("return true;"); + offset = PROGRAM_END - 1; + break; + } + case OpCode::Id::KIL: { + shader.AddLine("discard;"); + break; + } + case OpCode::Id::IPA: { + const auto& attribute = instr.attribute.fmt28; + std::string dest = GetRegister(instr.gpr0); + SetDest(attribute.element, dest, GetInputAttribute(attribute.index), 1, 4); + break; + } + default: { + NGLOG_CRITICAL(HW_GPU, "Unhandled instruction: {}", opcode->GetName()); + UNREACHABLE(); + } + } + + break; + } + } + + // Close the predicate condition scope. + if (instr.pred.pred_index != static_cast<u64>(Pred::UnusedIndex)) { + --shader.scope; + shader.AddLine('}'); + } + + return offset + 1; + } + + /** + * Compiles a range of instructions from Tegra to GLSL. + * @param begin the offset of the starting instruction. + * @param end the offset where the compilation should stop (exclusive). + * @return the offset of the next instruction to compile. PROGRAM_END if the program + * terminates. + */ + u32 CompileRange(u32 begin, u32 end) { + u32 program_counter; + for (program_counter = begin; program_counter < (begin > end ? PROGRAM_END : end);) { + program_counter = CompileInstr(program_counter); + } + return program_counter; + } + + void Generate() { + // Add declarations for all subroutines + for (const auto& subroutine : subroutines) { + shader.AddLine("bool " + subroutine.GetName() + "();"); + } + shader.AddNewLine(); + + // Add the main entry point + shader.AddLine("bool exec_shader() {"); + ++shader.scope; + CallSubroutine(GetSubroutine(main_offset, PROGRAM_END)); + --shader.scope; + shader.AddLine("}\n"); + + // Add definitions for all subroutines + for (const auto& subroutine : subroutines) { + std::set<u32> labels = subroutine.labels; + + shader.AddLine("bool " + subroutine.GetName() + "() {"); + ++shader.scope; + + if (labels.empty()) { + if (CompileRange(subroutine.begin, subroutine.end) != PROGRAM_END) { + shader.AddLine("return false;"); + } + } else { + labels.insert(subroutine.begin); + shader.AddLine("uint jmp_to = " + std::to_string(subroutine.begin) + "u;"); + shader.AddLine("while (true) {"); + ++shader.scope; + + shader.AddLine("switch (jmp_to) {"); + + for (auto label : labels) { + shader.AddLine("case " + std::to_string(label) + "u: {"); + ++shader.scope; + + auto next_it = labels.lower_bound(label + 1); + u32 next_label = next_it == labels.end() ? subroutine.end : *next_it; + + u32 compile_end = CompileRange(label, next_label); + if (compile_end > next_label && compile_end != PROGRAM_END) { + // This happens only when there is a label inside a IF/LOOP block + shader.AddLine("{ jmp_to = " + std::to_string(compile_end) + "u; break; }"); + labels.emplace(compile_end); + } + + --shader.scope; + shader.AddLine('}'); + } + + shader.AddLine("default: return false;"); + shader.AddLine('}'); + + --shader.scope; + shader.AddLine('}'); + + shader.AddLine("return false;"); + } + + --shader.scope; + shader.AddLine("}\n"); + + DEBUG_ASSERT(shader.scope == 0); + } + + GenerateDeclarations(); + } + + /// Returns a list of constant buffer declarations + std::vector<ConstBufferEntry> GetConstBuffersDeclarations() const { + std::vector<ConstBufferEntry> result; + std::copy_if(declr_const_buffers.begin(), declr_const_buffers.end(), + std::back_inserter(result), [](const auto& entry) { return entry.IsUsed(); }); + return result; + } + + /// Add declarations for registers + void GenerateDeclarations() { + for (const auto& reg : declr_register) { + declarations.AddLine("float " + reg + " = 0.0;"); + } + declarations.AddNewLine(); + + for (const auto& index : declr_input_attribute) { + // TODO(bunnei): Use proper number of elements for these + declarations.AddLine("layout(location = " + + std::to_string(static_cast<u32>(index) - + static_cast<u32>(Attribute::Index::Attribute_0)) + + ") in vec4 " + GetInputAttribute(index) + ";"); + } + declarations.AddNewLine(); + + for (const auto& index : declr_output_attribute) { + // TODO(bunnei): Use proper number of elements for these + declarations.AddLine("layout(location = " + + std::to_string(static_cast<u32>(index) - + static_cast<u32>(Attribute::Index::Attribute_0)) + + ") out vec4 " + GetOutputAttribute(index) + ";"); + } + declarations.AddNewLine(); + + unsigned const_buffer_layout = 0; + for (const auto& entry : GetConstBuffersDeclarations()) { + declarations.AddLine("layout(std430) buffer " + entry.GetName()); + declarations.AddLine('{'); + declarations.AddLine(" float c" + std::to_string(entry.GetIndex()) + "[];"); + declarations.AddLine("};"); + declarations.AddNewLine(); + ++const_buffer_layout; + } + + declarations.AddNewLine(); + for (const auto& pred : declr_predicates) { + declarations.AddLine("bool " + pred + " = false;"); + } + declarations.AddNewLine(); + } + +private: + const std::set<Subroutine>& subroutines; + const ProgramCode& program_code; + const u32 main_offset; + Maxwell3D::Regs::ShaderStage stage; + + ShaderWriter shader; + ShaderWriter declarations; + + // Declarations + std::set<std::string> declr_register; + std::set<std::string> declr_predicates; + std::set<Attribute::Index> declr_input_attribute; + std::set<Attribute::Index> declr_output_attribute; + std::array<ConstBufferEntry, Maxwell3D::Regs::MaxConstBuffers> declr_const_buffers; +}; // namespace Decompiler + +std::string GetCommonDeclarations() { + return "bool exec_shader();"; +} + +boost::optional<ProgramResult> DecompileProgram(const ProgramCode& program_code, u32 main_offset, + Maxwell3D::Regs::ShaderStage stage) { + try { + auto subroutines = ControlFlowAnalyzer(program_code, main_offset).GetSubroutines(); + GLSLGenerator generator(subroutines, program_code, main_offset, stage); + return ProgramResult{generator.GetShaderCode(), generator.GetEntries()}; + } catch (const DecompileFail& exception) { + NGLOG_ERROR(HW_GPU, "Shader decompilation failed: {}", exception.what()); + } + return boost::none; } } // namespace Decompiler -} // namespace Shader -} // namespace Maxwell3D +} // namespace GLShader |