shader_decode: Implement LDG and basic cbuf tracking
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ba38d91fe2
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3b84e04af1
7 changed files with 240 additions and 10 deletions
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@ -4,6 +4,7 @@
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#include <algorithm>
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#include <vector>
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#include <fmt/format.h>
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#include "common/assert.h"
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#include "common/common_types.h"
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@ -119,6 +120,54 @@ u32 ShaderIR::DecodeMemory(BasicBlock& bb, const BasicBlock& code, u32 pc) {
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}
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break;
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}
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case OpCode::Id::LDG: {
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const u32 count = [&]() {
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switch (instr.ldg.type) {
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case Tegra::Shader::UniformType::Single:
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return 1;
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case Tegra::Shader::UniformType::Double:
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return 2;
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case Tegra::Shader::UniformType::Quad:
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case Tegra::Shader::UniformType::UnsignedQuad:
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return 4;
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default:
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UNIMPLEMENTED_MSG("Unimplemented LDG size!");
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return 1;
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}
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}();
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const Node addr_register = GetRegister(instr.gpr8);
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const Node base_address = TrackCbuf(addr_register, code, static_cast<s64>(code.size()));
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const auto cbuf = std::get_if<CbufNode>(base_address);
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ASSERT(cbuf != nullptr);
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const auto cbuf_offset_imm = std::get_if<ImmediateNode>(cbuf->GetOffset());
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ASSERT(cbuf_offset_imm != nullptr);
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const auto cbuf_offset = cbuf_offset_imm->GetValue() * 4;
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bb.push_back(Comment(
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fmt::format("Base address is c[0x{:x}][0x{:x}]", cbuf->GetIndex(), cbuf_offset)));
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const GlobalMemoryBase descriptor{cbuf->GetIndex(), cbuf_offset};
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used_global_memory_bases.insert(descriptor);
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const Node immediate_offset =
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Immediate(static_cast<u32>(instr.ldg.immediate_offset.Value()));
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const Node base_real_address =
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Operation(OperationCode::UAdd, NO_PRECISE, immediate_offset, addr_register);
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for (u32 i = 0; i < count; ++i) {
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const Node it_offset = Immediate(i * 4);
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const Node real_address =
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Operation(OperationCode::UAdd, NO_PRECISE, base_real_address, it_offset);
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const Node gmem = StoreNode(GmemNode(real_address, base_address, descriptor));
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SetTemporal(bb, i, gmem);
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}
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for (u32 i = 0; i < count; ++i) {
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SetRegister(bb, instr.gpr0.Value() + i, GetTemporal(i));
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}
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break;
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}
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case OpCode::Id::ST_A: {
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UNIMPLEMENTED_IF_MSG(instr.gpr8.Value() != Register::ZeroIndex,
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"Indirect attribute loads are not supported");
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@ -257,6 +257,15 @@ private:
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bool is_indirect{};
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};
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struct GlobalMemoryBase {
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u32 cbuf_index{};
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u32 cbuf_offset{};
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bool operator<(const GlobalMemoryBase& rhs) const {
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return std::tie(cbuf_index, cbuf_offset) < std::tie(rhs.cbuf_index, rhs.cbuf_offset);
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}
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};
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struct MetaArithmetic {
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bool precise{};
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};
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@ -478,14 +487,26 @@ private:
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/// Global memory node
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class GmemNode final {
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public:
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explicit constexpr GmemNode(Node address) : address{address} {}
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explicit constexpr GmemNode(Node real_address, Node base_address,
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const GlobalMemoryBase& descriptor)
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: real_address{real_address}, base_address{base_address}, descriptor{descriptor} {}
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Node GetAddress() const {
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return address;
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Node GetRealAddress() const {
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return real_address;
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}
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Node GetBaseAddress() const {
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return base_address;
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}
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const GlobalMemoryBase& GetDescriptor() const {
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return descriptor;
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}
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private:
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const Node address;
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const Node real_address;
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const Node base_address;
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const GlobalMemoryBase descriptor;
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};
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/// Commentary, can be dropped
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@ -543,6 +564,10 @@ public:
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return used_clip_distances;
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}
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const std::set<GlobalMemoryBase>& GetGlobalMemoryBases() const {
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return used_global_memory_bases;
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}
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std::size_t GetLength() const {
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return static_cast<std::size_t>(coverage_end * sizeof(u64));
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}
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@ -734,6 +759,10 @@ private:
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void WriteLop3Instruction(BasicBlock& bb, Tegra::Shader::Register dest, Node op_a, Node op_b,
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Node op_c, Node imm_lut, bool sets_cc);
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Node TrackCbuf(Node tracked, const BasicBlock& code, s64 cursor);
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std::pair<Node, s64> TrackRegister(const GprNode* tracked, const BasicBlock& code, s64 cursor);
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template <typename... T>
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Node Operation(OperationCode code, const T*... operands) {
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return StoreNode(OperationNode(code, operands...));
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@ -786,6 +815,7 @@ private:
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std::map<u32, ConstBuffer> used_cbufs;
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std::set<Sampler> used_samplers;
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std::array<bool, Tegra::Engines::Maxwell3D::Regs::NumClipDistances> used_clip_distances{};
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std::set<GlobalMemoryBase> used_global_memory_bases;
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Tegra::Shader::Header header;
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};
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76
src/video_core/shader/track.cpp
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76
src/video_core/shader/track.cpp
Normal file
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@ -0,0 +1,76 @@
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// Copyright 2018 yuzu 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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#include <algorithm>
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#include <utility>
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#include <variant>
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#include "video_core/shader/shader_ir.h"
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namespace VideoCommon::Shader {
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namespace {
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std::pair<Node, s64> FindOperation(const BasicBlock& code, s64 cursor,
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OperationCode operation_code) {
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for (; cursor >= 0; --cursor) {
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const Node node = code[cursor];
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if (const auto operation = std::get_if<OperationNode>(node)) {
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if (operation->GetCode() == operation_code)
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return {node, cursor};
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}
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}
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return {};
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}
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} // namespace
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Node ShaderIR::TrackCbuf(Node tracked, const BasicBlock& code, s64 cursor) {
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if (const auto cbuf = std::get_if<CbufNode>(tracked)) {
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// Cbuf found, but it has to be immediate
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return std::holds_alternative<ImmediateNode>(*cbuf->GetOffset()) ? tracked : nullptr;
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}
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if (const auto gpr = std::get_if<GprNode>(tracked)) {
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if (gpr->GetIndex() == Tegra::Shader::Register::ZeroIndex) {
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return nullptr;
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}
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// Reduce the cursor in one to avoid infinite loops when the instruction sets the same
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// register that it uses as operand
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const auto [source, new_cursor] = TrackRegister(gpr, code, cursor - 1);
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if (!source) {
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return nullptr;
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}
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return TrackCbuf(source, code, new_cursor);
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}
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if (const auto operation = std::get_if<OperationNode>(tracked)) {
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for (std::size_t i = 0; i < operation->GetOperandsCount(); ++i) {
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if (const auto found = TrackCbuf((*operation)[i], code, cursor)) {
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// Cbuf found in operand
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return found;
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}
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}
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return nullptr;
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}
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return nullptr;
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}
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std::pair<Node, s64> ShaderIR::TrackRegister(const GprNode* tracked, const BasicBlock& code,
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s64 cursor) {
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for (; cursor >= 0; --cursor) {
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const auto [found_node, new_cursor] = FindOperation(code, cursor, OperationCode::Assign);
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if (!found_node) {
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return {};
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}
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const auto operation = std::get_if<OperationNode>(found_node);
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ASSERT(operation);
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const auto& target = (*operation)[0];
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if (const auto gpr_target = std::get_if<GprNode>(target)) {
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if (gpr_target->GetIndex() == tracked->GetIndex()) {
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return {(*operation)[1], new_cursor};
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}
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}
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}
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return {};
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}
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} // namespace VideoCommon::Shader
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