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renderer: emulate clip-disabled screen-space positions

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This commit is contained in:
nmzik
2026-09-01 21:09:05 +04:00
parent 0c8d7a1e49
commit 0c4dfd565e
8 changed files with 131 additions and 8 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+38
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@@ -408,6 +408,41 @@ void EmitAuxPositionExport(ValueEmitContext& ctx, uint32_t data, const IR::Expor
}
}
uint32_t ConvertClipCoordinate(EmitterState& state, uint32_t coordinate, float scale,
float offset, float half_extent) {
const auto window = state.builder.AllocateId();
const auto biased = state.builder.AllocateId();
const auto divided = state.builder.AllocateId();
const auto ndc = state.builder.AllocateId();
state.builder.AddFunction(
{OpFMul, TypeF32(state), window, coordinate, ConstantF32Value(state, scale)});
state.builder.AddFunction(
{OpFAdd, TypeF32(state), biased, window, ConstantF32Value(state, offset)});
state.builder.AddFunction(
{OpFDiv, TypeF32(state), divided, biased, ConstantF32Value(state, half_extent)});
state.builder.AddFunction(
{OpFSub, TypeF32(state), ndc, divided, ConstantF32Value(state, 1.0f)});
return ndc;
}
uint32_t ConvertPositionToClipSpace(EmitterState& state, uint32_t position) {
const auto& transform = state.input_info.vertex->clip_space;
uint32_t components[4] {};
for (uint32_t i = 0; i < 4; i++) {
components[i] = state.builder.AllocateId();
state.builder.AddFunction(
{OpCompositeExtract, TypeF32(state), components[i], position, i});
}
components[0] = ConvertClipCoordinate(state, components[0], transform.scale[0],
transform.offset[0], transform.half_extent[0]);
components[1] = ConvertClipCoordinate(state, components[1], transform.scale[1],
transform.offset[1], transform.half_extent[1]);
const auto converted = state.builder.AllocateId();
state.builder.AddFunction({OpCompositeConstruct, TypeF32Vector(state, 4), converted,
components[0], components[1], components[2], components[3]});
return converted;
}
void EmitExport(ValueEmitContext& ctx, const IR::Inst& inst) {
auto& state = ctx.state;
const auto& exp = ctx.Export(inst);
@@ -467,6 +502,9 @@ void EmitExport(ValueEmitContext& ctx, const IR::Inst& inst) {
}
}
if (exp.kind == IR::ExportTargetKind::Position) {
if (state.stage == ShaderType::Vertex && state.input_info.vertex->clip_space.enabled) {
value = ConvertPositionToClipSpace(state, value);
}
const auto pointer = state.builder.AllocateId();
state.builder.AddFunction(
{OpAccessChain, TypePointer(state, StorageClassOutput, TypeF32Vector(state, 4)),