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shader: read raw D16 depth bits through kDepth k16UInt image loads

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Co-authored-by: Artyom Zabroda <artyomzabroda@proton.me>
This commit is contained in:
nmzik
2026-10-22 18:56:26 +02:00
parent a358b847c1
commit aafe014d0c
6 changed files with 192 additions and 10 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterImage.cpp
+15 -6
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@@ -389,6 +389,7 @@ Format::BufferFormatInfo ImageConversionFormat(const EmitterState& state,
const auto format = image.conversion_format;
if (format == Prospero::BufferFormat::kInvalid) return {};
const auto info = Format::GetFormatInfo(format);
if (IR::ReadsDepthBits(image)) return info;
const bool raw_signed = IR::RawSignedStorageFormat(image, format) != Prospero::BufferFormat::kInvalid;
EXIT_IF((Prospero::RemapTextureFormat(format) == format && !raw_signed) || info.component_count == 0u ||
info.component_count > 4u);
@@ -424,6 +425,7 @@ uint32_t UnpackImageTexel(ValueEmitContext& ctx, const IR::MemoryInfo& mem, uint
const auto numeric_class = ctx.state.program.info.images[mem.resource].numeric_class;
const auto scalar_type = ImageScalarType(ctx.state, numeric_class);
const bool integer = info.packed_bitfield || info.type == Format::ComponentType::Uint;
uint32_t packed = 0;
if (info.packed_bitfield) {
packed = ctx.state.builder.AllocateId();
@@ -441,8 +443,16 @@ uint32_t UnpackImageTexel(ValueEmitContext& ctx, const IR::MemoryInfo& mem, uint
ctx.state.builder.AddFunction(spv::OpCompositeExtract, scalar_type,
components[component], texel, component);
// UNorm backing preserves the guest's filtering; scaling precedes swizzle constants.
const auto unorm_max = static_cast<float>((1u << info.component_bits[component]) - 1u);
components[component] = Binary(ctx.state, spv::OpFMul, scalar_type, components[component],
ConstantF32Value(ctx.state, 255.0f));
ConstantF32Value(ctx.state, unorm_max));
if (integer) {
// Depth bits: round back to the stored UNorm code.
components[component] =
Unary(ctx.state, spv::OpConvertFToU, TypeU32(ctx.state),
Binary(ctx.state, spv::OpFAdd, scalar_type, components[component],
ConstantF32Value(ctx.state, 0.5f)));
}
}
}
for (uint32_t component = info.component_count; component < 4u; component++) {
@@ -454,20 +464,19 @@ uint32_t UnpackImageTexel(ValueEmitContext& ctx, const IR::MemoryInfo& mem, uint
for (uint32_t component = 0; component < 4u; component++) {
const auto selector = (swizzle >> (component * 3u)) & 7u;
if (selector == 1u) {
selected[component] = info.packed_bitfield
selected[component] = integer
? ConstantU32(ctx.state, Format::FormattedConstantBits(info, Format::FormattedSourceKind::One))
: ConstantF32Value(ctx.state, 1.0f);
} else if (selector >= 4u) {
selected[component] = components[selector - 4u];
} else {
selected[component] = info.packed_bitfield ? ConstantU32(ctx.state, 0u)
: ZeroF32(ctx.state);
selected[component] = integer ? ConstantU32(ctx.state, 0u) : ZeroF32(ctx.state);
}
}
const auto result = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction(spv::OpCompositeConstruct,
ImageVectorType(ctx.state, numeric_class, 4), result, selected[0],
selected[1], selected[2], selected[3]);
integer ? TypeU32Vector(ctx.state, 4) : TypeF32Vector(ctx.state, 4),
result, selected[0], selected[1], selected[2], selected[3]);
return info.type == Format::ComponentType::Unorm
? Unary(ctx.state, spv::OpBitcast, TypeF32Vector(ctx.state, 4), result) : result;
}