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shader: add support for const buffer indirect addressing

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This commit is contained in:
Liam 2022-03-14 19:35:48 -04:00
parent cd07a43724
commit 52895fab67
2 changed files with 69 additions and 19 deletions
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53
src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
View file

@ -124,25 +124,56 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
Id GetCbuf(EmitContext& ctx, Id result_type, Id UniformDefinitions::*member_ptr, u32 element_size,
const IR::Value& binding, const IR::Value& offset) {
if (!binding.IsImmediate()) {
throw NotImplementedException("Constant buffer indexing");
}
const Id cbuf{ctx.cbufs[binding.U32()].*member_ptr};
std::array<Id, 2> indexes;
const Id uniform_type{ctx.uniform_types.*member_ptr};
if (!offset.IsImmediate()) {
if (offset.IsImmediate()) {
// Hardware been proved to read the aligned offset (e.g. LDC.U32 at 6 will read offset 4)
const Id imm_offset{ctx.Const(offset.U32() / element_size)};
indexes = {ctx.u32_zero_value, imm_offset};
} else {
Id index{ctx.Def(offset)};
if (element_size > 1) {
const u32 log2_element_size{static_cast<u32>(std::countr_zero(element_size))};
const Id shift{ctx.Const(log2_element_size)};
index = ctx.OpShiftRightArithmetic(ctx.U32[1], ctx.Def(offset), shift);
}
const Id access_chain{ctx.OpAccessChain(uniform_type, cbuf, ctx.u32_zero_value, index)};
return ctx.OpLoad(result_type, access_chain);
indexes = {ctx.u32_zero_value, index};
}
if (binding.IsImmediate()) {
const Id cbuf{ctx.cbufs[binding.U32()].*member_ptr};
const Id access_chain{ctx.OpAccessChain(uniform_type, cbuf, indexes)};
return ctx.OpLoad(result_type, access_chain);
} else {
const Id index{ctx.Def(binding)};
const Id ptr{ctx.TypePointer(spv::StorageClass::Function, result_type)};
const Id value{ctx.AddLocalVariable(ptr, spv::StorageClass::Function)};
const Id merge_label = ctx.OpLabel();
std::array<Id, Info::MAX_CBUFS> buf_labels;
std::array<Sirit::Literal, Info::MAX_CBUFS> buf_literals;
for (u32 i = 0; i < Info::MAX_CBUFS; i++) {
buf_labels[i] = ctx.OpLabel();
buf_literals[i] = Sirit::Literal{i};
}
ctx.OpSelectionMerge(merge_label, spv::SelectionControlMask::MaskNone);
ctx.OpSwitch(index, buf_labels[0], buf_literals, buf_labels);
for (u32 i = 0; i < Info::MAX_CBUFS; i++) {
ctx.AddLabel(buf_labels[i]);
const Id cbuf{ctx.cbufs[i].*member_ptr};
const Id access_chain{ctx.OpAccessChain(uniform_type, cbuf, indexes)};
const Id result = ctx.OpLoad(result_type, access_chain);
ctx.OpStore(value, result);
ctx.OpBranch(merge_label);
}
ctx.AddLabel(merge_label);
return ctx.OpLoad(result_type, value);
}
// Hardware been proved to read the aligned offset (e.g. LDC.U32 at 6 will read offset 4)
const Id imm_offset{ctx.Const(offset.U32() / element_size)};
const Id access_chain{ctx.OpAccessChain(uniform_type, cbuf, ctx.u32_zero_value, imm_offset)};
return ctx.OpLoad(result_type, access_chain);
}
Id GetCbufU32(EmitContext& ctx, const IR::Value& binding, const IR::Value& offset) {

35
src/shader_recompiler/ir_opt/collect_shader_info_pass.cpp
View file

@ -29,6 +29,20 @@ void AddConstantBufferDescriptor(Info& info, u32 index, u32 count) {
});
}
void AddRegisterIndexedLdc(Info& info) {
// The shader can use any possible constant buffer
info.constant_buffer_mask = (1 << Info::MAX_CBUFS) - 1;
auto& cbufs{info.constant_buffer_descriptors};
cbufs.clear();
for (u32 i = 0; i < Info::MAX_CBUFS; i++) {
cbufs.push_back(ConstantBufferDescriptor{.index = i, .count = 1});
// The shader can use any possible access size
info.constant_buffer_used_sizes[i] = 0x10'000;
}
}
void GetPatch(Info& info, IR::Patch patch) {
if (!IR::IsGeneric(patch)) {
throw NotImplementedException("Reading non-generic patch {}", patch);
@ -463,10 +477,12 @@ void VisitUsages(Info& info, IR::Inst& inst) {
case IR::Opcode::GetCbufU32x2: {
const IR::Value index{inst.Arg(0)};
const IR::Value offset{inst.Arg(1)};
if (!index.IsImmediate()) {
throw NotImplementedException("Constant buffer with non-immediate index");
if (index.IsImmediate()) {
AddConstantBufferDescriptor(info, index.U32(), 1);
} else {
AddRegisterIndexedLdc(info);
}
AddConstantBufferDescriptor(info, index.U32(), 1);
u32 element_size{};
switch (inst.GetOpcode()) {
case IR::Opcode::GetCbufU8:
@ -494,11 +510,14 @@ void VisitUsages(Info& info, IR::Inst& inst) {
default:
break;
}
u32& size{info.constant_buffer_used_sizes[index.U32()]};
if (offset.IsImmediate()) {
size = Common::AlignUp(std::max(size, offset.U32() + element_size), 16u);
} else {
size = 0x10'000;
if (index.IsImmediate()) {
u32& size{info.constant_buffer_used_sizes[index.U32()]};
if (offset.IsImmediate()) {
size = Common::AlignUp(std::max(size, offset.U32() + element_size), 16u);
} else {
size = 0x10'000;
}
}
break;
}