forked from suyu/suyu
0d1d755086
Some games search conditionally use global memory instructions. This allows the heuristic to search inside conditional nodes for the source constant buffer.
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
// Copyright 2018 yuzu Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <algorithm>
|
|
#include <utility>
|
|
#include <variant>
|
|
|
|
#include "video_core/shader/shader_ir.h"
|
|
|
|
namespace VideoCommon::Shader {
|
|
|
|
namespace {
|
|
std::pair<Node, s64> FindOperation(const NodeBlock& code, s64 cursor,
|
|
OperationCode operation_code) {
|
|
for (; cursor >= 0; --cursor) {
|
|
const Node node = code[cursor];
|
|
if (const auto operation = std::get_if<OperationNode>(node)) {
|
|
if (operation->GetCode() == operation_code)
|
|
return {node, cursor};
|
|
}
|
|
if (const auto conditional = std::get_if<ConditionalNode>(node)) {
|
|
const auto& code = conditional->GetCode();
|
|
const auto [found, internal_cursor] =
|
|
FindOperation(code, static_cast<s64>(code.size() - 1), operation_code);
|
|
if (found)
|
|
return {found, cursor};
|
|
}
|
|
}
|
|
return {};
|
|
}
|
|
} // namespace
|
|
|
|
Node ShaderIR::TrackCbuf(Node tracked, const NodeBlock& code, s64 cursor) {
|
|
if (const auto cbuf = std::get_if<CbufNode>(tracked)) {
|
|
// Cbuf found, but it has to be immediate
|
|
return std::holds_alternative<ImmediateNode>(*cbuf->GetOffset()) ? tracked : nullptr;
|
|
}
|
|
if (const auto gpr = std::get_if<GprNode>(tracked)) {
|
|
if (gpr->GetIndex() == Tegra::Shader::Register::ZeroIndex) {
|
|
return nullptr;
|
|
}
|
|
// Reduce the cursor in one to avoid infinite loops when the instruction sets the same
|
|
// register that it uses as operand
|
|
const auto [source, new_cursor] = TrackRegister(gpr, code, cursor - 1);
|
|
if (!source) {
|
|
return nullptr;
|
|
}
|
|
return TrackCbuf(source, code, new_cursor);
|
|
}
|
|
if (const auto operation = std::get_if<OperationNode>(tracked)) {
|
|
for (std::size_t i = 0; i < operation->GetOperandsCount(); ++i) {
|
|
if (const auto found = TrackCbuf((*operation)[i], code, cursor)) {
|
|
// Cbuf found in operand
|
|
return found;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
if (const auto conditional = std::get_if<ConditionalNode>(tracked)) {
|
|
const auto& code = conditional->GetCode();
|
|
return TrackCbuf(tracked, code, static_cast<s64>(code.size()));
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
std::pair<Node, s64> ShaderIR::TrackRegister(const GprNode* tracked, const NodeBlock& code,
|
|
s64 cursor) {
|
|
for (; cursor >= 0; --cursor) {
|
|
const auto [found_node, new_cursor] = FindOperation(code, cursor, OperationCode::Assign);
|
|
if (!found_node) {
|
|
return {};
|
|
}
|
|
const auto operation = std::get_if<OperationNode>(found_node);
|
|
ASSERT(operation);
|
|
|
|
const auto& target = (*operation)[0];
|
|
if (const auto gpr_target = std::get_if<GprNode>(target)) {
|
|
if (gpr_target->GetIndex() == tracked->GetIndex()) {
|
|
return {(*operation)[1], new_cursor};
|
|
}
|
|
}
|
|
}
|
|
return {};
|
|
}
|
|
|
|
} // namespace VideoCommon::Shader
|