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vk_shader_decompiler: Implement non-OperationCode visits

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This commit is contained in:
ReinUsesLisp 2019-03-14 02:43:40 -03:00
parent b758c861b0
commit d316d248ab
1 changed files with 129 additions and 7 deletions
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136
src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
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@ -494,25 +494,136 @@ private:
return (this->*decompiler)(*operation);
} else if (const auto gpr = std::get_if<GprNode>(node)) {
UNIMPLEMENTED();
const u32 index = gpr->GetIndex();
if (index == Register::ZeroIndex) {
return Constant(t_float, 0.0f);
}
return Emit(OpLoad(t_float, registers.at(index)));
} else if (const auto immediate = std::get_if<ImmediateNode>(node)) {
UNIMPLEMENTED();
return BitcastTo<Type::Float>(Constant(t_uint, immediate->GetValue()));
} else if (const auto predicate = std::get_if<PredicateNode>(node)) {
UNIMPLEMENTED();
const auto value = [&]() -> Id {
switch (const auto index = predicate->GetIndex(); index) {
case Tegra::Shader::Pred::UnusedIndex:
return v_true;
case Tegra::Shader::Pred::NeverExecute:
return v_false;
default:
return Emit(OpLoad(t_bool, predicates.at(index)));
}
}();
if (predicate->IsNegated()) {
return Emit(OpLogicalNot(t_bool, value));
}
return value;
} else if (const auto abuf = std::get_if<AbufNode>(node)) {
UNIMPLEMENTED();
const auto attribute = abuf->GetIndex();
const auto element = abuf->GetElement();
switch (attribute) {
case Attribute::Index::Position:
if (stage != ShaderStage::Fragment) {
UNIMPLEMENTED();
break;
} else {
if (element == 3) {
return Constant(t_float, 1.0f);
}
return Emit(OpLoad(t_float, AccessElement(t_in_float, frag_coord, element)));
}
case Attribute::Index::TessCoordInstanceIDVertexID:
// TODO(Subv): Find out what the values are for the first two elements when inside a
// vertex shader, and what's the value of the fourth element when inside a Tess Eval
// shader.
ASSERT(stage == ShaderStage::Vertex);
switch (element) {
case 2:
return BitcastFrom<Type::Uint>(Emit(OpLoad(t_uint, instance_index)));
case 3:
return BitcastFrom<Type::Uint>(Emit(OpLoad(t_uint, vertex_index)));
}
UNIMPLEMENTED_MSG("Unmanaged TessCoordInstanceIDVertexID element={}", element);
return Constant(t_float, 0);
case Attribute::Index::FrontFacing:
// TODO(Subv): Find out what the values are for the other elements.
ASSERT(stage == ShaderStage::Fragment);
if (element == 3) {
const Id is_front_facing = Emit(OpLoad(t_bool, front_facing));
const Id true_value =
BitcastTo<Type::Float>(Constant(t_int, static_cast<s32>(-1)));
const Id false_value = BitcastTo<Type::Float>(Constant(t_int, 0));
return Emit(OpSelect(t_float, is_front_facing, true_value, false_value));
}
UNIMPLEMENTED_MSG("Unmanaged FrontFacing element={}", element);
return Constant(t_float, 0.0f);
default:
if (IsGenericAttribute(attribute)) {
const Id pointer =
AccessElement(t_in_float, input_attributes.at(attribute), element);
return Emit(OpLoad(t_float, pointer));
}
break;
}
UNIMPLEMENTED_MSG("Unhandled input attribute: {}", static_cast<u32>(attribute));
} else if (const auto cbuf = std::get_if<CbufNode>(node)) {
UNIMPLEMENTED();
const Node offset = cbuf->GetOffset();
const Id buffer_id = constant_buffers.at(cbuf->GetIndex());
Id buffer_index{};
Id buffer_element{};
if (const auto immediate = std::get_if<ImmediateNode>(offset)) {
// Direct access
const u32 offset_imm = immediate->GetValue();
ASSERT(offset_imm % 4 == 0);
buffer_index = Constant(t_uint, offset_imm / 16);
buffer_element = Constant(t_uint, (offset_imm / 4) % 4);
} else if (std::holds_alternative<OperationNode>(*offset)) {
// Indirect access
// TODO(Rodrigo): Use a uniform buffer stride of 4 and drop this slow math (which
// emits sub-optimal code on GLSL from my testing).
const Id offset_id = BitcastTo<Type::Uint>(Visit(offset));
const Id unsafe_offset = Emit(OpUDiv(t_uint, offset_id, Constant(t_uint, 4)));
const Id final_offset = Emit(
OpUMod(t_uint, unsafe_offset, Constant(t_uint, MAX_CONSTBUFFER_ELEMENTS - 1)));
buffer_index = Emit(OpUDiv(t_uint, final_offset, Constant(t_uint, 4)));
buffer_element = Emit(OpUMod(t_uint, final_offset, Constant(t_uint, 4)));
} else {
UNREACHABLE_MSG("Unmanaged offset node type");
}
const Id pointer = Emit(OpAccessChain(t_cbuf_float, buffer_id, Constant(t_uint, 0),
buffer_index, buffer_element));
return Emit(OpLoad(t_float, pointer));
} else if (const auto gmem = std::get_if<GmemNode>(node)) {
UNIMPLEMENTED();
const Id gmem_buffer = global_buffers.at(gmem->GetDescriptor());
const Id real = BitcastTo<Type::Uint>(Visit(gmem->GetRealAddress()));
const Id base = BitcastTo<Type::Uint>(Visit(gmem->GetBaseAddress()));
Id offset = Emit(OpISub(t_uint, real, base));
offset = Emit(OpUDiv(t_uint, offset, Constant(t_uint, 4u)));
return Emit(OpLoad(t_float, Emit(OpAccessChain(t_gmem_float, gmem_buffer,
Constant(t_uint, 0u), offset))));
} else if (const auto conditional = std::get_if<ConditionalNode>(node)) {
UNIMPLEMENTED();
// It's invalid to call conditional on nested nodes, use an operation instead
const Id true_label = OpLabel();
const Id skip_label = OpLabel();
Emit(OpBranchConditional(Visit(conditional->GetCondition()), true_label, skip_label));
Emit(true_label);
VisitBasicBlock(conditional->GetCode());
Emit(OpBranch(skip_label));
Emit(skip_label);
return {};
} else if (const auto comment = std::get_if<CommentNode>(node)) {
Name(Emit(OpUndef(t_void)), comment->GetText());
@ -719,6 +830,17 @@ private:
return false;
}
template <typename... Args>
Id AccessElement(Id pointer_type, Id composite, Args... elements_) {
std::vector<Id> members;
auto elements = {elements_...};
for (const auto element : elements) {
members.push_back(Constant(t_uint, element));
}
return Emit(OpAccessChain(pointer_type, composite, members));
}
template <Type type>
Id VisitOperand(Operation operation, std::size_t operand_index) {
const Id value = Visit(operation[operand_index]);