forked from suyu/suyu
77 lines
2.9 KiB
C++
77 lines
2.9 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 "common/assert.h"
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#include "common/common_types.h"
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#include "video_core/engines/shader_bytecode.h"
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#include "video_core/shader/node_helper.h"
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#include "video_core/shader/shader_ir.h"
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namespace VideoCommon::Shader {
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using Tegra::Shader::Instruction;
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using Tegra::Shader::OpCode;
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u32 ShaderIR::DecodeBfe(NodeBlock& bb, u32 pc) {
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const Instruction instr = {program_code[pc]};
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const auto opcode = OpCode::Decode(instr);
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Node op_a = GetRegister(instr.gpr8);
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Node op_b = [&] {
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switch (opcode->get().GetId()) {
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case OpCode::Id::BFE_R:
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return GetRegister(instr.gpr20);
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case OpCode::Id::BFE_C:
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return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
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case OpCode::Id::BFE_IMM:
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return Immediate(instr.alu.GetSignedImm20_20());
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default:
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UNREACHABLE();
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return Immediate(0);
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}
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}();
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UNIMPLEMENTED_IF_MSG(instr.bfe.rd_cc, "Condition codes in BFE is not implemented");
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const bool is_signed = instr.bfe.is_signed;
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// using reverse parallel method in
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// https://graphics.stanford.edu/~seander/bithacks.html#ReverseParallel
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// note for later if possible to implement faster method.
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if (instr.bfe.brev) {
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const auto swap = [&](u32 s, u32 mask) {
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Node v1 =
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SignedOperation(OperationCode::ILogicalShiftRight, is_signed, op_a, Immediate(s));
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if (mask != 0) {
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v1 = SignedOperation(OperationCode::IBitwiseAnd, is_signed, std::move(v1),
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Immediate(mask));
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}
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Node v2 = op_a;
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if (mask != 0) {
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v2 = SignedOperation(OperationCode::IBitwiseAnd, is_signed, std::move(v2),
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Immediate(mask));
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}
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v2 = SignedOperation(OperationCode::ILogicalShiftLeft, is_signed, std::move(v2),
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Immediate(s));
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return SignedOperation(OperationCode::IBitwiseOr, is_signed, std::move(v1),
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std::move(v2));
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};
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op_a = swap(1, 0x55555555U);
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op_a = swap(2, 0x33333333U);
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op_a = swap(4, 0x0F0F0F0FU);
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op_a = swap(8, 0x00FF00FFU);
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op_a = swap(16, 0);
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}
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const auto offset = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_b,
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Immediate(0), Immediate(8));
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const auto bits = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_b,
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Immediate(8), Immediate(8));
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auto result = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_a, offset, bits);
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SetRegister(bb, instr.gpr0, std::move(result));
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return pc;
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}
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} // namespace VideoCommon::Shader
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