126 lines
4.1 KiB
C++
126 lines
4.1 KiB
C++
// Copyright 2015 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <array>
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#include <cstddef>
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#include <utility>
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#include <vector>
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#include <nihstro/shader_bytecode.h>
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#include <xbyak.h>
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#include "common/bit_set.h"
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#include "common/common_types.h"
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#include "common/x64/emitter.h"
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#include "video_core/shader/shader.h"
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using nihstro::Instruction;
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using nihstro::OpCode;
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using nihstro::SwizzlePattern;
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namespace Pica {
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namespace Shader {
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/// Memory allocated for each compiled shader (64Kb)
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constexpr size_t MAX_SHADER_SIZE = 1024 * 64;
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/**
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* This class implements the shader JIT compiler. It recompiles a Pica shader program into x86_64
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* code that can be executed on the host machine directly.
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*/
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class JitShader : public Xbyak::CodeGenerator {
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public:
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JitShader();
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void Run(const ShaderSetup& setup, UnitState& state, unsigned offset) const {
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program(&setup, &state, instruction_labels[offset].getAddress());
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}
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void Compile(const std::array<u32, 1024>* program_code,
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const std::array<u32, 1024>* swizzle_data);
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void Compile_ADD(Instruction instr);
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void Compile_DP3(Instruction instr);
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void Compile_DP4(Instruction instr);
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void Compile_DPH(Instruction instr);
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void Compile_EX2(Instruction instr);
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void Compile_LG2(Instruction instr);
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void Compile_MUL(Instruction instr);
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void Compile_SGE(Instruction instr);
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void Compile_SLT(Instruction instr);
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void Compile_FLR(Instruction instr);
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void Compile_MAX(Instruction instr);
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void Compile_MIN(Instruction instr);
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void Compile_RCP(Instruction instr);
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void Compile_RSQ(Instruction instr);
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void Compile_MOVA(Instruction instr);
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void Compile_MOV(Instruction instr);
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void Compile_NOP(Instruction instr);
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void Compile_END(Instruction instr);
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void Compile_CALL(Instruction instr);
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void Compile_CALLC(Instruction instr);
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void Compile_CALLU(Instruction instr);
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void Compile_IF(Instruction instr);
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void Compile_LOOP(Instruction instr);
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void Compile_JMP(Instruction instr);
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void Compile_CMP(Instruction instr);
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void Compile_MAD(Instruction instr);
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private:
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void Compile_Block(unsigned end);
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void Compile_NextInstr();
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void Compile_SwizzleSrc(Instruction instr, unsigned src_num, SourceRegister src_reg,
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Xbyak::Xmm dest);
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void Compile_DestEnable(Instruction instr, Xbyak::Xmm dest);
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/**
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* Compiles a `MUL src1, src2` operation, properly handling the PICA semantics when multiplying
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* zero by inf. Clobbers `src2` and `scratch`.
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*/
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void Compile_SanitizedMul(Xbyak::Xmm src1, Xbyak::Xmm src2, Xbyak::Xmm scratch);
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void Compile_EvaluateCondition(Instruction instr);
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void Compile_UniformCondition(Instruction instr);
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/**
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* Emits the code to conditionally return from a subroutine envoked by the `CALL` instruction.
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*/
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void Compile_Return();
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BitSet32 PersistentCallerSavedRegs();
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/**
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* Assertion evaluated at compile-time, but only triggered if executed at runtime.
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* @param msg Message to be logged if the assertion fails.
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*/
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void Compile_Assert(bool condition, const char* msg);
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/**
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* Analyzes the entire shader program for `CALL` instructions before emitting any code,
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* identifying the locations where a return needs to be inserted.
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*/
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void FindReturnOffsets();
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const std::array<u32, 1024>* program_code = nullptr;
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const std::array<u32, 1024>* swizzle_data = nullptr;
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/// Mapping of Pica VS instructions to pointers in the emitted code
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std::array<Xbyak::Label, 1024> instruction_labels;
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/// Offsets in code where a return needs to be inserted
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std::vector<unsigned> return_offsets;
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unsigned program_counter = 0; ///< Offset of the next instruction to decode
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bool looping = false; ///< True if compiling a loop, used to check for nested loops
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using CompiledShader = void(const void* setup, void* state, const u8* start_addr);
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CompiledShader* program = nullptr;
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};
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} // Shader
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} // Pica
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