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shader: decode compressed UNORM16 MRT exports

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This commit is contained in:
nmzik
2026-08-21 05:23:09 +02:00
parent 342fae06a6
commit 79443aa104
3 changed files with 36 additions and 7 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+11 -7
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@@ -203,10 +203,12 @@ uint32_t EmitAttribute(ValueEmitContext& ctx, uint32_t attr, uint32_t chan) {
return bits;
}
bool MrtUsesUint(const EmitterState& state, const IR::ExportInfo& exp) {
return state.stage == ShaderType::Pixel && exp.kind == IR::ExportTargetKind::Mrt &&
exp.index < std::size(state.input_info.pixel->target_output_mode) &&
state.input_info.pixel->target_output_mode[exp.index] == 7u;
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)) {
return 0;
}
return state.input_info.pixel->target_output_mode[exp.index];
}
uint32_t ExportRawComponent(ValueEmitContext& ctx, uint32_t vector, uint32_t component) {
@@ -220,6 +222,8 @@ uint32_t ExportVector(ValueEmitContext& ctx, uint32_t data, const IR::ExportInfo
bool uint_output) {
auto& state = ctx.state;
if (exp.compr && !uint_output) {
const auto unpack = MrtOutputMode(state, exp) == 5u ? GlslUnpackUnorm2x16
: GlslUnpackHalf2x16;
uint32_t f32[4] = {ConstantF32(state, 0), ConstantF32(state, 0), ConstantF32(state, 0),
ConstantF32(state, 0x3f800000u)};
for (uint32_t pair = 0; pair < 2u; pair++) {
@@ -229,8 +233,8 @@ uint32_t ExportVector(ValueEmitContext& ctx, uint32_t data, const IR::ExportInfo
const auto packed = state.builder.AllocateId();
const auto unpacked = state.builder.AllocateId();
state.builder.AddFunction({OpCompositeExtract, TypeU32(state), packed, data, pair});
state.builder.AddFunction({OpExtInst, TypeF32Vector(state, 2), unpacked,
GlslStd450(state), GlslUnpackHalf2x16, packed});
state.builder.AddFunction(
{OpExtInst, TypeF32Vector(state, 2), unpacked, GlslStd450(state), unpack, packed});
for (uint32_t lane = 0; lane < 2u; lane++) {
const auto component = pair * 2u + lane;
if (((exp.en >> component) & 1u) != 0u) {
@@ -332,7 +336,7 @@ void EmitExport(ValueEmitContext& ctx, const IR::Inst& inst) {
if (variable == 0) {
return;
}
const bool uint_output = MrtUsesUint(state, exp);
const bool uint_output = MrtOutputMode(state, exp) == 7u;
const auto vector_type = uint_output ? TypeU32Vector(state, 4) : TypeF32Vector(state, 4);
auto value = ExportVector(ctx, data, exp, uint_output);
if (state.stage == ShaderType::Pixel && exp.kind == IR::ExportTargetKind::Mrt &&