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// Copyright 2018 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;
u32 ShaderIR::DecodeFfma(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
UNIMPLEMENTED_IF_MSG(instr.ffma.cc != 0, "FFMA cc not implemented");
DEBUG_ASSERT_MSG(instr.ffma.tab5980_0 == 1, "FFMA tab5980_0({}) not implemented",
instr.ffma.tab5980_0.Value()); // Seems to be 1 by default based on SMO
DEBUG_ASSERT_MSG(instr.ffma.tab5980_1 == 0, "FFMA tab5980_1({}) not implemented",
instr.ffma.tab5980_1.Value());
const Node op_a = GetRegister(instr.gpr8);
auto [op_b, op_c] = [&]() -> std::tuple<Node, Node> {
switch (opcode->get().GetId()) {
case OpCode::Id::FFMA_CR: {
return {GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset()),
GetRegister(instr.gpr39)};
}
case OpCode::Id::FFMA_RR:
return {GetRegister(instr.gpr20), GetRegister(instr.gpr39)};
case OpCode::Id::FFMA_RC: {
return {GetRegister(instr.gpr39),
GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset())};
}
case OpCode::Id::FFMA_IMM:
return {GetImmediate19(instr), GetRegister(instr.gpr39)};
default:
UNIMPLEMENTED_MSG("Unhandled FFMA instruction: {}", opcode->get().GetName());
return {Immediate(0), Immediate(0)};
}
}();
op_b = GetOperandAbsNegFloat(op_b, false, instr.ffma.negate_b);
op_c = GetOperandAbsNegFloat(op_c, false, instr.ffma.negate_c);
Node value = Operation(OperationCode::FFma, PRECISE, op_a, op_b, op_c);
value = GetSaturatedFloat(value, instr.alu.saturate_d);
SetInternalFlagsFromFloat(bb, value, instr.generates_cc);
SetRegister(bb, instr.gpr0, value);
return pc;
}
} // namespace VideoCommon::Shader
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