112 lines
4.0 KiB
C++
112 lines
4.0 KiB
C++
// 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 "common/common_types.h"
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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 NodeBlock& code, s64 cursor,
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OperationCode operation_code) {
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for (; cursor >= 0; --cursor) {
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Node node = code.at(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 {std::move(node), cursor};
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}
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}
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if (const auto conditional = std::get_if<ConditionalNode>(&*node)) {
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const auto& conditional_code = conditional->GetCode();
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auto [found, internal_cursor] = FindOperation(
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conditional_code, static_cast<s64>(conditional_code.size() - 1), operation_code);
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if (found) {
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return {std::move(found), 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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} // Anonymous namespace
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std::tuple<Node, u32, u32> ShaderIR::TrackCbuf(Node tracked, const NodeBlock& code,
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s64 cursor) const {
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if (const auto cbuf = std::get_if<CbufNode>(&*tracked)) {
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// Constant buffer found, test if it's an immediate
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const auto offset = cbuf->GetOffset();
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if (const auto immediate = std::get_if<ImmediateNode>(&*offset)) {
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return {tracked, cbuf->GetIndex(), immediate->GetValue()};
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}
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return {};
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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 {};
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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 {};
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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 = operation->GetOperandsCount(); i > 0; --i) {
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if (auto found = TrackCbuf((*operation)[i - 1], code, cursor); std::get<0>(found)) {
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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 {};
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}
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if (const auto conditional = std::get_if<ConditionalNode>(&*tracked)) {
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const auto& conditional_code = conditional->GetCode();
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return TrackCbuf(tracked, conditional_code, static_cast<s64>(conditional_code.size()));
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}
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return {};
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}
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std::optional<u32> ShaderIR::TrackImmediate(Node tracked, const NodeBlock& code, s64 cursor) const {
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// Reduce the cursor in one to avoid infinite loops when the instruction sets the same register
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// that it uses as operand
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const auto [found, found_cursor] =
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TrackRegister(&std::get<GprNode>(*tracked), code, cursor - 1);
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if (!found) {
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return {};
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}
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if (const auto immediate = std::get_if<ImmediateNode>(&*found)) {
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return immediate->GetValue();
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}
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return {};
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}
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std::pair<Node, s64> ShaderIR::TrackRegister(const GprNode* tracked, const NodeBlock& code,
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s64 cursor) const {
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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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