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graphics: support RDNA2 custom pixel interpolation

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Co-authored-by: Senaxx <Senaxx@users.noreply.github.com>
This commit is contained in:
nmzik
2026-08-21 23:33:40 +02:00
parent 17c2b4cc7d
commit 5e64efce4f
14 changed files with 414 additions and 28 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+82
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@@ -93,6 +93,18 @@ uint32_t EmitBuiltinU32(ValueEmitContext& ctx, IR::StageInputKind kind, uint32_t
state.builder.AddFunction({OpBitcast, TypeU32(state), bits, value});
return bits;
}
if (kind == IR::StageInputKind::BaryCoordSmooth ||
kind == IR::StageInputKind::BaryCoordNoPerspective) {
const auto pointer = state.builder.AllocateId();
const auto value = state.builder.AllocateId();
const auto bits = state.builder.AllocateId();
state.builder.AddFunction({OpAccessChain,
TypePointer(state, StorageClassInput, TypeF32(state)), pointer,
variable, ConstantU32(state, component + 1u)});
state.builder.AddFunction({OpLoad, TypeF32(state), value, pointer});
state.builder.AddFunction({OpBitcast, TypeU32(state), bits, value});
return bits;
}
return EmitInputComponentU32(state, kind, component);
}
@@ -187,6 +199,43 @@ uint32_t EmitAttribute(ValueEmitContext& ctx, uint32_t attr, uint32_t chan) {
if (state.stage == ShaderType::Vertex) {
return EmitVertexParameterComponentU32(state, *input, chan & 3u);
}
const auto load_per_vertex = [&](uint32_t vertex) {
const auto pointer = state.builder.AllocateId();
const auto value = state.builder.AllocateId();
state.builder.AddFunction(
{OpAccessChain, TypePointer(state, StorageClassInput, TypeF32(state)), pointer,
input->variable_id, ConstantU32(state, vertex), ConstantU32(state, chan & 3u)});
state.builder.AddFunction({OpLoad, TypeF32(state), value, pointer});
return value;
};
if (input->per_vertex) {
const auto barycentric_kind = state.input_info.pixel->ps_no_perspective
? IR::StageInputKind::BaryCoordNoPerspective
: IR::StageInputKind::BaryCoordSmooth;
const auto barycentric = InputVariableForKind(state, barycentric_kind);
uint32_t sum = 0;
for (uint32_t vertex = 0; vertex < 3u; vertex++) {
const auto pointer = state.builder.AllocateId();
const auto weight = state.builder.AllocateId();
const auto product = state.builder.AllocateId();
state.builder.AddFunction({OpAccessChain,
TypePointer(state, StorageClassInput, TypeF32(state)),
pointer, barycentric, ConstantU32(state, vertex)});
state.builder.AddFunction({OpLoad, TypeF32(state), weight, pointer});
state.builder.AddFunction(
{OpFMul, TypeF32(state), product, load_per_vertex(vertex), weight});
if (vertex == 0u) {
sum = product;
} else {
const auto next = state.builder.AllocateId();
state.builder.AddFunction({OpFAdd, TypeF32(state), next, sum, product});
sum = next;
}
}
const auto bits = state.builder.AllocateId();
state.builder.AddFunction({OpBitcast, TypeU32(state), bits, sum});
return bits;
}
const auto vector = state.builder.AllocateId();
const auto component = state.builder.AllocateId();
const auto bits = state.builder.AllocateId();
@@ -196,6 +245,35 @@ uint32_t EmitAttribute(ValueEmitContext& ctx, uint32_t attr, uint32_t chan) {
return bits;
}
uint32_t EmitInterpolationParameter(ValueEmitContext& ctx, uint32_t attr, uint32_t chan,
uint32_t mode) {
auto& state = ctx.state;
const auto* input = InputBindingForParameter(state, attr);
if (!input->per_vertex) {
return EmitAttribute(ctx, attr, chan);
}
const auto load_vertex = [&](uint32_t vertex) {
const auto pointer = state.builder.AllocateId();
const auto value = state.builder.AllocateId();
state.builder.AddFunction(
{OpAccessChain, TypePointer(state, StorageClassInput, TypeF32(state)), pointer,
input->variable_id, ConstantU32(state, vertex), ConstantU32(state, chan & 3u)});
state.builder.AddFunction({OpLoad, TypeF32(state), value, pointer});
return value;
};
const auto selected_vertex = (mode + 1u) % 3u;
uint32_t value = load_vertex(selected_vertex);
if (!PixelParameterIsCustom(state, attr) && mode < 2u) {
const auto delta = state.builder.AllocateId();
state.builder.AddFunction({OpFSub, TypeF32(state), delta, value, load_vertex(0)});
value = delta;
}
const auto bits = state.builder.AllocateId();
state.builder.AddFunction({OpBitcast, TypeU32(state), bits, value});
return bits;
}
uint32_t MrtOutputMode(const EmitterState& state, const IR::ExportInfo& exp) {
if (state.stage != ShaderType::Pixel || exp.kind != IR::ExportTargetKind::Mrt ||
exp.index >= std::size(state.input_info.pixel->target_output_mode)) {
@@ -515,6 +593,10 @@ bool EmitValueFlow(ValueEmitContext& ctx, const IR::Inst& inst) {
case IR::ValueOpcode::GetAttribute:
ctx.Define(inst, EmitAttribute(ctx, inst.Arg(0).U32(), inst.Arg(1).U32()));
return true;
case IR::ValueOpcode::GetInterpolationParameter:
ctx.Define(inst, EmitInterpolationParameter(ctx, inst.Arg(0).U32(), inst.Arg(1).U32(),
inst.Arg(2).U32()));
return true;
case IR::ValueOpcode::SetAttribute: EmitExport(ctx, inst); return true;
case IR::ValueOpcode::GetShaderBase:
// Guest S_GETPC values stay shader-relative in SPIR-V, matching the runtime ABI. The