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Merge pull request #288 from Subv/macro_interpreter

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GPU: Implemented a gpu macro interpreter
This commit is contained in:
bunnei 2018-04-02 10:04:19 -04:00 committed by GitHub
commit 3413f1f7ce
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5 changed files with 444 additions and 121 deletions
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2
src/video_core/CMakeLists.txt
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@ -11,6 +11,8 @@ add_library(video_core STATIC
engines/maxwell_compute.h
gpu.cpp
gpu.h
macro_interpreter.cpp
macro_interpreter.h
memory_manager.cpp
memory_manager.h
rasterizer_interface.h

113
src/video_core/engines/maxwell_3d.cpp
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@ -19,35 +19,21 @@ namespace Engines {
/// First register id that is actually a Macro call.
constexpr u32 MacroRegistersStart = 0xE00;
const std::unordered_map<u32, Maxwell3D::MethodInfo> Maxwell3D::method_handlers = {
{0xE1A, {"BindTextureInfoBuffer", 1, &Maxwell3D::BindTextureInfoBuffer}},
{0xE24, {"SetShader", 5, &Maxwell3D::SetShader}},
{0xE2A, {"BindStorageBuffer", 1, &Maxwell3D::BindStorageBuffer}},
};
Maxwell3D::Maxwell3D(MemoryManager& memory_manager) : memory_manager(memory_manager) {}
Maxwell3D::Maxwell3D(MemoryManager& memory_manager)
: memory_manager(memory_manager), macro_interpreter(*this) {}
void Maxwell3D::SubmitMacroCode(u32 entry, std::vector<u32> code) {
uploaded_macros[entry * 2 + MacroRegistersStart] = std::move(code);
}
void Maxwell3D::CallMacroMethod(u32 method, const std::vector<u32>& parameters) {
// TODO(Subv): Write an interpreter for the macros uploaded via registers 0x45 and 0x47
void Maxwell3D::CallMacroMethod(u32 method, std::vector<u32> parameters) {
auto macro_code = uploaded_macros.find(method);
// The requested macro must have been uploaded already.
ASSERT_MSG(uploaded_macros.find(method) != uploaded_macros.end(), "Macro %08X was not uploaded",
method);
ASSERT_MSG(macro_code != uploaded_macros.end(), "Macro %08X was not uploaded", method);
auto itr = method_handlers.find(method);
ASSERT_MSG(itr != method_handlers.end(), "Unhandled method call %08X", method);
ASSERT(itr->second.arguments == parameters.size());
(this->*itr->second.handler)(parameters);
// Reset the current macro and its parameters.
// Reset the current macro and execute it.
executing_macro = 0;
macro_params.clear();
macro_interpreter.Execute(macro_code->second, std::move(parameters));
}
void Maxwell3D::WriteReg(u32 method, u32 value, u32 remaining_params) {
@ -77,7 +63,7 @@ void Maxwell3D::WriteReg(u32 method, u32 value, u32 remaining_params) {
// Call the macro when there are no more parameters in the command buffer
if (remaining_params == 0) {
CallMacroMethod(executing_macro, macro_params);
CallMacroMethod(executing_macro, std::move(macro_params));
}
return;
}
@ -193,84 +179,6 @@ void Maxwell3D::DrawArrays() {
VideoCore::g_renderer->Rasterizer()->AccelerateDrawBatch(false /*is_indexed*/);
}
void Maxwell3D::BindTextureInfoBuffer(const std::vector<u32>& parameters) {
/**
* Parameters description:
* [0] = Shader stage, usually 4 for FragmentShader
*/
u32 stage = parameters[0];
// Perform the same operations as the real macro code.
GPUVAddr address = static_cast<GPUVAddr>(regs.tex_info_buffers.address[stage]) << 8;
u32 size = regs.tex_info_buffers.size[stage];
regs.const_buffer.cb_size = size;
regs.const_buffer.cb_address_high = address >> 32;
regs.const_buffer.cb_address_low = address & 0xFFFFFFFF;
}
void Maxwell3D::SetShader(const std::vector<u32>& parameters) {
/**
* Parameters description:
* [0] = Shader Program.
* [1] = Unknown, presumably the shader id.
* [2] = Offset to the start of the shader, after the 0x30 bytes header.
* [3] = Shader Stage.
* [4] = Const Buffer Address >> 8.
*/
auto shader_program = static_cast<Regs::ShaderProgram>(parameters[0]);
// TODO(Subv): This address is probably an offset from the CODE_ADDRESS register.
GPUVAddr address = parameters[2];
auto shader_stage = static_cast<Regs::ShaderStage>(parameters[3]);
GPUVAddr cb_address = parameters[4] << 8;
auto& shader = state.shader_programs[static_cast<size_t>(shader_program)];
shader.program = shader_program;
shader.stage = shader_stage;
shader.address = address;
// Perform the same operations as the real macro code.
// TODO(Subv): Early exit if register 0xD1C + shader_program contains the same as params[1].
auto& shader_regs = regs.shader_config[static_cast<size_t>(shader_program)];
shader_regs.start_id = address;
// TODO(Subv): Write params[1] to register 0xD1C + shader_program.
// TODO(Subv): Write params[2] to register 0xD22 + shader_program.
// Note: This value is hardcoded in the macro's code.
static constexpr u32 DefaultCBSize = 0x10000;
regs.const_buffer.cb_size = DefaultCBSize;
regs.const_buffer.cb_address_high = cb_address >> 32;
regs.const_buffer.cb_address_low = cb_address & 0xFFFFFFFF;
// Write a hardcoded 0x11 to CB_BIND, this binds the current const buffer to buffer c1[] in the
// shader. It's likely that these are the constants for the shader.
regs.cb_bind[static_cast<size_t>(shader_stage)].valid.Assign(1);
regs.cb_bind[static_cast<size_t>(shader_stage)].index.Assign(1);
ProcessCBBind(shader_stage);
}
void Maxwell3D::BindStorageBuffer(const std::vector<u32>& parameters) {
/**
* Parameters description:
* [0] = Buffer offset >> 2
*/
u32 buffer_offset = parameters[0] << 2;
// Perform the same operations as the real macro code.
// Note: This value is hardcoded in the macro's code.
static constexpr u32 DefaultCBSize = 0x5F00;
regs.const_buffer.cb_size = DefaultCBSize;
GPUVAddr address = regs.ssbo_info.BufferAddress();
regs.const_buffer.cb_address_high = address >> 32;
regs.const_buffer.cb_address_low = address & 0xFFFFFFFF;
regs.const_buffer.cb_pos = buffer_offset;
}
void Maxwell3D::ProcessCBBind(Regs::ShaderStage stage) {
// Bind the buffer currently in CB_ADDRESS to the specified index in the desired shader stage.
auto& shader = state.shader_stages[static_cast<size_t>(stage)];
@ -386,5 +294,10 @@ std::vector<Texture::FullTextureInfo> Maxwell3D::GetStageTextures(Regs::ShaderSt
return textures;
}
u32 Maxwell3D::GetRegisterValue(u32 method) const {
ASSERT_MSG(method < Regs::NUM_REGS, "Invalid Maxwell3D register");
return regs.reg_array[method];
}
} // namespace Engines
} // namespace Tegra

29
src/video_core/engines/maxwell_3d.h
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@ -13,6 +13,7 @@
#include "common/common_types.h"
#include "common/math_util.h"
#include "video_core/gpu.h"
#include "video_core/macro_interpreter.h"
#include "video_core/memory_manager.h"
#include "video_core/textures/texture.h"
@ -498,22 +499,18 @@ public:
bool enabled;
};
struct ShaderProgramInfo {
Regs::ShaderStage stage;
Regs::ShaderProgram program;
GPUVAddr address;
};
struct ShaderStageInfo {
std::array<ConstBufferInfo, Regs::MaxConstBuffers> const_buffers;
};
std::array<ShaderStageInfo, Regs::MaxShaderStage> shader_stages;
std::array<ShaderProgramInfo, Regs::MaxShaderProgram> shader_programs;
};
State state{};
/// Reads a register value located at the input method address
u32 GetRegisterValue(u32 method) const;
/// Write the value to the register identified by method.
void WriteReg(u32 method, u32 value, u32 remaining_params);
@ -533,6 +530,9 @@ private:
/// Parameters that have been submitted to the macro call so far.
std::vector<u32> macro_params;
/// Interpreter for the macro codes uploaded to the GPU.
MacroInterpreter macro_interpreter;
/// Retrieves information about a specific TIC entry from the TIC buffer.
Texture::TICEntry GetTICEntry(u32 tic_index) const;
@ -544,7 +544,7 @@ private:
* @param method Method to call
* @param parameters Arguments to the method call
*/
void CallMacroMethod(u32 method, const std::vector<u32>& parameters);
void CallMacroMethod(u32 method, std::vector<u32> parameters);
/// Handles a write to the QUERY_GET register.
void ProcessQueryGet();
@ -557,19 +557,6 @@ private:
/// Handles a write to the VERTEX_END_GL register, triggering a draw.
void DrawArrays();
/// Method call handlers
void BindTextureInfoBuffer(const std::vector<u32>& parameters);
void SetShader(const std::vector<u32>& parameters);
void BindStorageBuffer(const std::vector<u32>& parameters);
struct MethodInfo {
const char* name;
u32 arguments;
void (Maxwell3D::*handler)(const std::vector<u32>& parameters);
};
static const std::unordered_map<u32, MethodInfo> method_handlers;
};
#define ASSERT_REG_POSITION(field_name, position) \

257
src/video_core/macro_interpreter.cpp Normal file
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@ -0,0 +1,257 @@
// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "common/logging/log.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/macro_interpreter.h"
namespace Tegra {
MacroInterpreter::MacroInterpreter(Engines::Maxwell3D& maxwell3d) : maxwell3d(maxwell3d) {}
void MacroInterpreter::Execute(const std::vector<u32>& code, std::vector<u32> parameters) {
Reset();
registers[1] = parameters[0];
this->parameters = std::move(parameters);
// Execute the code until we hit an exit condition.
bool keep_executing = true;
while (keep_executing) {
keep_executing = Step(code, false);
}
// Assert the the macro used all the input parameters
ASSERT(next_parameter_index == this->parameters.size());
}
void MacroInterpreter::Reset() {
registers = {};
pc = 0;
delayed_pc = boost::none;
method_address.raw = 0;
parameters.clear();
// The next parameter index starts at 1, because $r1 already has the value of the first
// parameter.
next_parameter_index = 1;
}
bool MacroInterpreter::Step(const std::vector<u32>& code, bool is_delay_slot) {
u32 base_address = pc;
Opcode opcode = GetOpcode(code);
pc += 4;
// Update the program counter if we were delayed
if (delayed_pc != boost::none) {
ASSERT(is_delay_slot);
pc = *delayed_pc;
delayed_pc = boost::none;
}
switch (opcode.operation) {
case Operation::ALU: {
u32 result = GetALUResult(opcode.alu_operation, GetRegister(opcode.src_a),
GetRegister(opcode.src_b));
ProcessResult(opcode.result_operation, opcode.dst, result);
break;
}
case Operation::AddImmediate: {
ProcessResult(opcode.result_operation, opcode.dst,
GetRegister(opcode.src_a) + opcode.immediate);
break;
}
case Operation::ExtractInsert: {
u32 dst = GetRegister(opcode.src_a);
u32 src = GetRegister(opcode.src_b);
src = (src >> opcode.bf_src_bit) & opcode.GetBitfieldMask();
dst &= ~(opcode.GetBitfieldMask() << opcode.bf_dst_bit);
dst |= src << opcode.bf_dst_bit;
ProcessResult(opcode.result_operation, opcode.dst, dst);
break;
}
case Operation::ExtractShiftLeftImmediate: {
u32 dst = GetRegister(opcode.src_a);
u32 src = GetRegister(opcode.src_b);
u32 result = ((src >> dst) & opcode.GetBitfieldMask()) << opcode.bf_dst_bit;
ProcessResult(opcode.result_operation, opcode.dst, result);
break;
}
case Operation::ExtractShiftLeftRegister: {
u32 dst = GetRegister(opcode.src_a);
u32 src = GetRegister(opcode.src_b);
u32 result = ((src >> opcode.bf_src_bit) & opcode.GetBitfieldMask()) << dst;
ProcessResult(opcode.result_operation, opcode.dst, result);
break;
}
case Operation::Read: {
u32 result = Read(GetRegister(opcode.src_a) + opcode.immediate);
ProcessResult(opcode.result_operation, opcode.dst, result);
break;
}
case Operation::Branch: {
ASSERT_MSG(!is_delay_slot, "Executing a branch in a delay slot is not valid");
u32 value = GetRegister(opcode.src_a);
bool taken = EvaluateBranchCondition(opcode.branch_condition, value);
if (taken) {
// Ignore the delay slot if the branch has the annul bit.
if (opcode.branch_annul) {
pc = base_address + (opcode.immediate << 2);
return true;
}
delayed_pc = base_address + (opcode.immediate << 2);
// Execute one more instruction due to the delay slot.
return Step(code, true);
}
break;
}
default:
UNIMPLEMENTED_MSG("Unimplemented macro operation %u",
static_cast<u32>(opcode.operation.Value()));
}
if (opcode.is_exit) {
// Exit has a delay slot, execute the next instruction
// Note: Executing an exit during a branch delay slot will cause the instruction at the
// branch target to be executed before exiting.
Step(code, true);
return false;
}
return true;
}
MacroInterpreter::Opcode MacroInterpreter::GetOpcode(const std::vector<u32>& code) const {
ASSERT((pc % sizeof(u32)) == 0);
ASSERT(pc < code.size() * sizeof(u32));
return {code[pc / sizeof(u32)]};
}
u32 MacroInterpreter::GetALUResult(ALUOperation operation, u32 src_a, u32 src_b) const {
switch (operation) {
case ALUOperation::Add:
return src_a + src_b;
// TODO(Subv): Implement AddWithCarry
case ALUOperation::Subtract:
return src_a - src_b;
// TODO(Subv): Implement SubtractWithBorrow
case ALUOperation::Xor:
return src_a ^ src_b;
case ALUOperation::Or:
return src_a | src_b;
case ALUOperation::And:
return src_a & src_b;
case ALUOperation::AndNot:
return src_a & ~src_b;
case ALUOperation::Nand:
return ~(src_a & src_b);
default:
UNIMPLEMENTED_MSG("Unimplemented ALU operation %u", static_cast<u32>(operation));
}
}
void MacroInterpreter::ProcessResult(ResultOperation operation, u32 reg, u32 result) {
switch (operation) {
case ResultOperation::IgnoreAndFetch:
// Fetch parameter and ignore result.
SetRegister(reg, FetchParameter());
break;
case ResultOperation::Move:
// Move result.
SetRegister(reg, result);
break;
case ResultOperation::MoveAndSetMethod:
// Move result and use as Method Address.
SetRegister(reg, result);
SetMethodAddress(result);
break;
case ResultOperation::FetchAndSend:
// Fetch parameter and send result.
SetRegister(reg, FetchParameter());
Send(result);
break;
case ResultOperation::MoveAndSend:
// Move and send result.
SetRegister(reg, result);
Send(result);
break;
case ResultOperation::FetchAndSetMethod:
// Fetch parameter and use result as Method Address.
SetRegister(reg, FetchParameter());
SetMethodAddress(result);
break;
case ResultOperation::MoveAndSetMethodFetchAndSend:
// Move result and use as Method Address, then fetch and send parameter.
SetRegister(reg, result);
SetMethodAddress(result);
Send(FetchParameter());
break;
case ResultOperation::MoveAndSetMethodSend:
// Move result and use as Method Address, then send bits 12:17 of result.
SetRegister(reg, result);
SetMethodAddress(result);
Send((result >> 12) & 0b111111);
break;
default:
UNIMPLEMENTED_MSG("Unimplemented result operation %u", static_cast<u32>(operation));
}
}
u32 MacroInterpreter::FetchParameter() {
ASSERT(next_parameter_index < parameters.size());
return parameters[next_parameter_index++];
}
u32 MacroInterpreter::GetRegister(u32 register_id) const {
// Register 0 is supposed to always return 0.
if (register_id == 0)
return 0;
ASSERT(register_id < registers.size());
return registers[register_id];
}
void MacroInterpreter::SetRegister(u32 register_id, u32 value) {
// Register 0 is supposed to always return 0. NOP is implemented as a store to the zero
// register.
if (register_id == 0)
return;
ASSERT(register_id < registers.size());
registers[register_id] = value;
}
void MacroInterpreter::SetMethodAddress(u32 address) {
method_address.raw = address;
}
void MacroInterpreter::Send(u32 value) {
maxwell3d.WriteReg(method_address.address, value, 0);
// Increment the method address by the method increment.
method_address.address.Assign(method_address.address.Value() +
method_address.increment.Value());
}
u32 MacroInterpreter::Read(u32 method) const {
return maxwell3d.GetRegisterValue(method);
}
bool MacroInterpreter::EvaluateBranchCondition(BranchCondition cond, u32 value) const {
switch (cond) {
case BranchCondition::Zero:
return value == 0;
case BranchCondition::NotZero:
return value != 0;
}
UNREACHABLE();
}
} // namespace Tegra

164
src/video_core/macro_interpreter.h Normal file
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@ -0,0 +1,164 @@
// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <vector>
#include <boost/optional.hpp>
#include "common/bit_field.h"
#include "common/common_types.h"
namespace Tegra {
namespace Engines {
class Maxwell3D;
}
class MacroInterpreter final {
public:
explicit MacroInterpreter(Engines::Maxwell3D& maxwell3d);
/**
* Executes the macro code with the specified input parameters.
* @param code The macro byte code to execute
* @param parameters The parameters of the macro
*/
void Execute(const std::vector<u32>& code, std::vector<u32> parameters);
private:
enum class Operation : u32 {
ALU = 0,
AddImmediate = 1,
ExtractInsert = 2,
ExtractShiftLeftImmediate = 3,
ExtractShiftLeftRegister = 4,
Read = 5,
Unused = 6, // This operation doesn't seem to be a valid encoding.
Branch = 7,
};
enum class ALUOperation : u32 {
Add = 0,
AddWithCarry = 1,
Subtract = 2,
SubtractWithBorrow = 3,
// Operations 4-7 don't seem to be valid encodings.
Xor = 8,
Or = 9,
And = 10,
AndNot = 11,
Nand = 12
};
enum class ResultOperation : u32 {
IgnoreAndFetch = 0,
Move = 1,
MoveAndSetMethod = 2,
FetchAndSend = 3,
MoveAndSend = 4,
FetchAndSetMethod = 5,
MoveAndSetMethodFetchAndSend = 6,
MoveAndSetMethodSend = 7
};
enum class BranchCondition : u32 {
Zero = 0,
NotZero = 1,
};
union Opcode {
u32 raw;
BitField<0, 3, Operation> operation;
BitField<4, 3, ResultOperation> result_operation;
BitField<4, 1, BranchCondition> branch_condition;
BitField<5, 1, u32>
branch_annul; // If set on a branch, then the branch doesn't have a delay slot.
BitField<7, 1, u32> is_exit;
BitField<8, 3, u32> dst;
BitField<11, 3, u32> src_a;
BitField<14, 3, u32> src_b;
// The signed immediate overlaps the second source operand and the alu operation.
BitField<14, 18, s32> immediate;
BitField<17, 5, ALUOperation> alu_operation;
// Bitfield instructions data
BitField<17, 5, u32> bf_src_bit;
BitField<22, 5, u32> bf_size;
BitField<27, 5, u32> bf_dst_bit;
u32 GetBitfieldMask() const {
return (1 << bf_size) - 1;
}
};
union MethodAddress {
u32 raw;
BitField<0, 12, u32> address;
BitField<12, 6, u32> increment;
};
/// Resets the execution engine state, zeroing registers, etc.
void Reset();
/**
* Executes a single macro instruction located at the current program counter. Returns whether
* the interpreter should keep running.
* @param code The macro code to execute.
* @param is_delay_slot Whether the current step is being executed due to a delay slot in a
* previous instruction.
*/
bool Step(const std::vector<u32>& code, bool is_delay_slot);
/// Calculates the result of an ALU operation. src_a OP src_b;
u32 GetALUResult(ALUOperation operation, u32 src_a, u32 src_b) const;
/// Performs the result operation on the input result and stores it in the specified register
/// (if necessary).
void ProcessResult(ResultOperation operation, u32 reg, u32 result);
/// Evaluates the branch condition and returns whether the branch should be taken or not.
bool EvaluateBranchCondition(BranchCondition cond, u32 value) const;
/// Reads an opcode at the current program counter location.
Opcode GetOpcode(const std::vector<u32>& code) const;
/// Returns the specified register's value. Register 0 is hardcoded to always return 0.
u32 GetRegister(u32 register_id) const;
/// Sets the register to the input value.
void SetRegister(u32 register_id, u32 value);
/// Sets the method address to use for the next Send instruction.
void SetMethodAddress(u32 address);
/// Calls a GPU Engine method with the input parameter.
void Send(u32 value);
/// Reads a GPU register located at the method address.
u32 Read(u32 method) const;
/// Returns the next parameter in the parameter queue.
u32 FetchParameter();
Engines::Maxwell3D& maxwell3d;
u32 pc; ///< Current program counter
boost::optional<u32>
delayed_pc; ///< Program counter to execute at after the delay slot is executed.
static constexpr size_t NumMacroRegisters = 8;
/// General purpose macro registers.
std::array<u32, NumMacroRegisters> registers = {};
/// Method address to use for the next Send instruction.
MethodAddress method_address = {};
/// Input parameters of the current macro.
std::vector<u32> parameters;
/// Index of the next parameter that will be fetched by the 'parm' instruction.
u32 next_parameter_index = 0;
};
} // namespace Tegra