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// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "common/common_types.h"
#include "video_core/engines/shader_bytecode.h"
#include "video_core/shader/node_helper.h"
#include "video_core/shader/shader_ir.h"
namespace VideoCommon::Shader {
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
using Tegra::Shader::Pred;
using Tegra::Shader::ShuffleOperation;
using Tegra::Shader::VoteOperation;
namespace {
OperationCode GetOperationCode(VoteOperation vote_op) {
switch (vote_op) {
case VoteOperation::All:
return OperationCode::VoteAll;
case VoteOperation::Any:
return OperationCode::VoteAny;
case VoteOperation::Eq:
return OperationCode::VoteEqual;
default:
UNREACHABLE_MSG("Invalid vote operation={}", static_cast<u64>(vote_op));
return OperationCode::VoteAll;
}
}
} // Anonymous namespace
u32 ShaderIR::DecodeWarp(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
switch (opcode->get().GetId()) {
case OpCode::Id::VOTE: {
const Node value = GetPredicate(instr.vote.value, instr.vote.negate_value != 0);
const Node active = Operation(OperationCode::BallotThread, value);
const Node vote = Operation(GetOperationCode(instr.vote.operation), value);
SetRegister(bb, instr.gpr0, active);
SetPredicate(bb, instr.vote.dest_pred, vote);
break;
}
case OpCode::Id::SHFL: {
Node mask = instr.shfl.is_mask_imm ? Immediate(static_cast<u32>(instr.shfl.mask_imm))
: GetRegister(instr.gpr39);
Node width = [&] {
// Convert the obscure SHFL mask back into GL_NV_shader_thread_shuffle's width. This has
// been done reversing Nvidia's math. It won't work on all cases due to SHFL having
// different parameters that don't properly map to GLSL's interface, but it should work
// for cases emitted by Nvidia's compiler.
if (instr.shfl.operation == ShuffleOperation::Up) {
return Operation(
OperationCode::ILogicalShiftRight,
Operation(OperationCode::IAdd, std::move(mask), Immediate(-0x2000)),
Immediate(8));
} else {
return Operation(OperationCode::ILogicalShiftRight,
Operation(OperationCode::IAdd, Immediate(0x201F),
Operation(OperationCode::INegate, std::move(mask))),
Immediate(8));
}
}();
const auto [operation, in_range] = [instr]() -> std::pair<OperationCode, OperationCode> {
switch (instr.shfl.operation) {
case ShuffleOperation::Idx:
return {OperationCode::ShuffleIndexed, OperationCode::InRangeShuffleIndexed};
case ShuffleOperation::Up:
return {OperationCode::ShuffleUp, OperationCode::InRangeShuffleUp};
case ShuffleOperation::Down:
return {OperationCode::ShuffleDown, OperationCode::InRangeShuffleDown};
case ShuffleOperation::Bfly:
return {OperationCode::ShuffleButterfly, OperationCode::InRangeShuffleButterfly};
}
UNREACHABLE_MSG("Invalid SHFL operation: {}",
static_cast<u64>(instr.shfl.operation.Value()));
return {};
}();
// Setting the predicate before the register is intentional to avoid overwriting.
Node index = instr.shfl.is_index_imm ? Immediate(static_cast<u32>(instr.shfl.index_imm))
: GetRegister(instr.gpr20);
SetPredicate(bb, instr.shfl.pred48, Operation(in_range, index, width));
SetRegister(
bb, instr.gpr0,
Operation(operation, GetRegister(instr.gpr8), std::move(index), std::move(width)));
break;
}
default:
UNIMPLEMENTED_MSG("Unhandled warp instruction: {}", opcode->get().GetName());
break;
}
return pc;
}
} // namespace VideoCommon::Shader
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