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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 "common/logging/log.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::ConditionCode;
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
using Tegra::Shader::Register;
using Tegra::Shader::SystemVariable;
u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
switch (opcode->get().GetId()) {
case OpCode::Id::NOP: {
UNIMPLEMENTED_IF(instr.nop.cc != Tegra::Shader::ConditionCode::T);
UNIMPLEMENTED_IF(instr.nop.trigger != 0);
// With the previous preconditions, this instruction is a no-operation.
break;
}
case OpCode::Id::EXIT: {
const Tegra::Shader::ConditionCode cc = instr.flow_condition_code;
UNIMPLEMENTED_IF_MSG(cc != Tegra::Shader::ConditionCode::T, "EXIT condition code used: {}",
static_cast<u32>(cc));
switch (instr.flow.cond) {
case Tegra::Shader::FlowCondition::Always:
bb.push_back(Operation(OperationCode::Exit));
if (instr.pred.pred_index == static_cast<u64>(Tegra::Shader::Pred::UnusedIndex)) {
// If this is an unconditional exit then just end processing here,
// otherwise we have to account for the possibility of the condition
// not being met, so continue processing the next instruction.
pc = MAX_PROGRAM_LENGTH - 1;
}
break;
case Tegra::Shader::FlowCondition::Fcsm_Tr:
// TODO(bunnei): What is this used for? If we assume this conditon is not
// satisifed, dual vertex shaders in Farming Simulator make more sense
UNIMPLEMENTED_MSG("Skipping unknown FlowCondition::Fcsm_Tr");
break;
default:
UNIMPLEMENTED_MSG("Unhandled flow condition: {}",
static_cast<u32>(instr.flow.cond.Value()));
}
break;
}
case OpCode::Id::KIL: {
UNIMPLEMENTED_IF(instr.flow.cond != Tegra::Shader::FlowCondition::Always);
const Tegra::Shader::ConditionCode cc = instr.flow_condition_code;
UNIMPLEMENTED_IF_MSG(cc != Tegra::Shader::ConditionCode::T, "KIL condition code used: {}",
static_cast<u32>(cc));
bb.push_back(Operation(OperationCode::Discard));
break;
}
case OpCode::Id::MOV_SYS: {
const Node value = [&]() {
switch (instr.sys20) {
case SystemVariable::Ydirection:
return Operation(OperationCode::YNegate);
case SystemVariable::InvocationInfo:
LOG_WARNING(HW_GPU, "MOV_SYS instruction with InvocationInfo is incomplete");
return Immediate(0u);
case SystemVariable::Tid: {
Node value = Immediate(0);
value = BitfieldInsert(value, Operation(OperationCode::LocalInvocationIdX), 0, 9);
value = BitfieldInsert(value, Operation(OperationCode::LocalInvocationIdY), 16, 9);
value = BitfieldInsert(value, Operation(OperationCode::LocalInvocationIdZ), 26, 5);
return value;
}
case SystemVariable::TidX:
return Operation(OperationCode::LocalInvocationIdX);
case SystemVariable::TidY:
return Operation(OperationCode::LocalInvocationIdY);
case SystemVariable::TidZ:
return Operation(OperationCode::LocalInvocationIdZ);
case SystemVariable::CtaIdX:
return Operation(OperationCode::WorkGroupIdX);
case SystemVariable::CtaIdY:
return Operation(OperationCode::WorkGroupIdY);
case SystemVariable::CtaIdZ:
return Operation(OperationCode::WorkGroupIdZ);
default:
UNIMPLEMENTED_MSG("Unhandled system move: {}",
static_cast<u32>(instr.sys20.Value()));
return Immediate(0u);
}
}();
SetRegister(bb, instr.gpr0, value);
break;
}
case OpCode::Id::BRA: {
Node branch;
if (instr.bra.constant_buffer == 0) {
const u32 target = pc + instr.bra.GetBranchTarget();
branch = Operation(OperationCode::Branch, Immediate(target));
} else {
const u32 target = pc + 1;
const Node op_a = GetConstBuffer(instr.cbuf36.index, instr.cbuf36.GetOffset());
const Node convert = SignedOperation(OperationCode::IArithmeticShiftRight, true,
PRECISE, op_a, Immediate(3));
const Node operand =
Operation(OperationCode::IAdd, PRECISE, convert, Immediate(target));
branch = Operation(OperationCode::BranchIndirect, operand);
}
const Tegra::Shader::ConditionCode cc = instr.flow_condition_code;
if (cc != Tegra::Shader::ConditionCode::T) {
bb.push_back(Conditional(GetConditionCode(cc), {branch}));
} else {
bb.push_back(branch);
}
break;
}
case OpCode::Id::BRX: {
Node operand;
if (instr.brx.constant_buffer != 0) {
const s32 target = pc + 1;
const Node index = GetRegister(instr.gpr8);
const Node op_a =
GetConstBufferIndirect(instr.cbuf36.index, instr.cbuf36.GetOffset() + 0, index);
const Node convert = SignedOperation(OperationCode::IArithmeticShiftRight, true,
PRECISE, op_a, Immediate(3));
operand = Operation(OperationCode::IAdd, PRECISE, convert, Immediate(target));
} else {
const s32 target = pc + instr.brx.GetBranchExtend();
const Node op_a = GetRegister(instr.gpr8);
const Node convert = SignedOperation(OperationCode::IArithmeticShiftRight, true,
PRECISE, op_a, Immediate(3));
operand = Operation(OperationCode::IAdd, PRECISE, convert, Immediate(target));
}
const Node branch = Operation(OperationCode::BranchIndirect, operand);
const Tegra::Shader::ConditionCode cc = instr.flow_condition_code;
if (cc != Tegra::Shader::ConditionCode::T) {
bb.push_back(Conditional(GetConditionCode(cc), {branch}));
} else {
bb.push_back(branch);
}
break;
}
case OpCode::Id::SSY: {
UNIMPLEMENTED_IF_MSG(instr.bra.constant_buffer != 0,
"Constant buffer flow is not supported");
if (decompiled) {
break;
}
// The SSY opcode tells the GPU where to re-converge divergent execution paths with SYNC.
const u32 target = pc + instr.bra.GetBranchTarget();
bb.push_back(
Operation(OperationCode::PushFlowStack, MetaStackClass::Ssy, Immediate(target)));
break;
}
case OpCode::Id::PBK: {
UNIMPLEMENTED_IF_MSG(instr.bra.constant_buffer != 0,
"Constant buffer PBK is not supported");
if (decompiled) {
break;
}
// PBK pushes to a stack the address where BRK will jump to.
const u32 target = pc + instr.bra.GetBranchTarget();
bb.push_back(
Operation(OperationCode::PushFlowStack, MetaStackClass::Pbk, Immediate(target)));
break;
}
case OpCode::Id::SYNC: {
const Tegra::Shader::ConditionCode cc = instr.flow_condition_code;
UNIMPLEMENTED_IF_MSG(cc != Tegra::Shader::ConditionCode::T, "SYNC condition code used: {}",
static_cast<u32>(cc));
if (decompiled) {
break;
}
// The SYNC opcode jumps to the address previously set by the SSY opcode
bb.push_back(Operation(OperationCode::PopFlowStack, MetaStackClass::Ssy));
break;
}
case OpCode::Id::BRK: {
const Tegra::Shader::ConditionCode cc = instr.flow_condition_code;
UNIMPLEMENTED_IF_MSG(cc != Tegra::Shader::ConditionCode::T, "BRK condition code used: {}",
static_cast<u32>(cc));
if (decompiled) {
break;
}
// The BRK opcode jumps to the address previously set by the PBK opcode
bb.push_back(Operation(OperationCode::PopFlowStack, MetaStackClass::Pbk));
break;
}
case OpCode::Id::IPA: {
const bool is_physical = instr.ipa.idx && instr.gpr8.Value() != 0xff;
const auto attribute = instr.attribute.fmt28;
const Tegra::Shader::IpaMode input_mode{instr.ipa.interp_mode.Value(),
instr.ipa.sample_mode.Value()};
Node value = is_physical ? GetPhysicalInputAttribute(instr.gpr8)
: GetInputAttribute(attribute.index, attribute.element);
const Tegra::Shader::Attribute::Index index = attribute.index.Value();
const bool is_generic = index >= Tegra::Shader::Attribute::Index::Attribute_0 &&
index <= Tegra::Shader::Attribute::Index::Attribute_31;
if (is_generic || is_physical) {
// TODO(Blinkhawk): There are cases where a perspective attribute use PASS.
// In theory by setting them as perspective, OpenGL does the perspective correction.
// A way must figured to reverse the last step of it.
if (input_mode.interpolation_mode == Tegra::Shader::IpaInterpMode::Multiply) {
value = Operation(OperationCode::FMul, PRECISE, value, GetRegister(instr.gpr20));
}
}
value = GetSaturatedFloat(value, instr.ipa.saturate);
SetRegister(bb, instr.gpr0, value);
break;
}
case OpCode::Id::OUT_R: {
UNIMPLEMENTED_IF_MSG(instr.gpr20.Value() != Register::ZeroIndex,
"Stream buffer is not supported");
if (instr.out.emit) {
// gpr0 is used to store the next address and gpr8 contains the address to emit.
// Hardware uses pointers here but we just ignore it
bb.push_back(Operation(OperationCode::EmitVertex));
SetRegister(bb, instr.gpr0, Immediate(0));
}
if (instr.out.cut) {
bb.push_back(Operation(OperationCode::EndPrimitive));
}
break;
}
case OpCode::Id::ISBERD: {
UNIMPLEMENTED_IF(instr.isberd.o != 0);
UNIMPLEMENTED_IF(instr.isberd.skew != 0);
UNIMPLEMENTED_IF(instr.isberd.shift != Tegra::Shader::IsberdShift::None);
UNIMPLEMENTED_IF(instr.isberd.mode != Tegra::Shader::IsberdMode::None);
LOG_WARNING(HW_GPU, "ISBERD instruction is incomplete");
SetRegister(bb, instr.gpr0, GetRegister(instr.gpr8));
break;
}
case OpCode::Id::DEPBAR: {
LOG_WARNING(HW_GPU, "DEPBAR instruction is stubbed");
break;
}
default:
UNIMPLEMENTED_MSG("Unhandled instruction: {}", opcode->get().GetName());
}
return pc;
}
} // namespace VideoCommon::Shader
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