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graphics: implement RDNA2 D16 image packing

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This commit is contained in:
nmzik
2026-08-20 18:06:43 +02:00
parent 1190d5de7d
commit 129c64235f
8 changed files with 168 additions and 21 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterImage.cpp
+68 -7
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@@ -14,6 +14,13 @@ uint32_t DmaskComponentIndex(uint32_t dmask, uint32_t component) {
return index;
}
uint32_t DmaskComponent(uint32_t dmask, uint32_t index) {
for (uint32_t component = 0; component < 4u; component++) {
if (((dmask >> component) & 1u) != 0u && index-- == 0u) return component;
}
return 0u;
}
uint32_t ImageGatherComponent(uint32_t dmask) {
switch (dmask) {
case 0x2u: return 1;
@@ -191,7 +198,49 @@ uint32_t FloatBits(ValueEmitContext& ctx, uint32_t value) {
return Unary(ctx.state, OpBitcast, TypeU32(ctx.state), value);
}
uint32_t ResultVector(ValueEmitContext& ctx, uint32_t value, bool integer, bool dref) {
uint32_t ResultVector(ValueEmitContext& ctx, uint32_t value, bool integer, bool dref,
const IR::MemoryInfo& mem, bool gather = false) {
if (mem.data_bits == 16u) {
uint32_t packed[4] = {ConstantU32(ctx.state, 0), ConstantU32(ctx.state, 0),
ConstantU32(ctx.state, 0), ConstantU32(ctx.state, 0)};
const auto scalar = [&](uint32_t index) {
if (dref) return value;
const auto component = gather ? index : DmaskComponent(mem.dmask, index);
const auto result = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction(
{OpCompositeExtract, integer ? TypeU32(ctx.state) : TypeF32(ctx.state), result,
value, component});
return result;
};
for (uint32_t word = 0; word < mem.data_dwords; word++) {
const auto low_index = word * 2u;
const auto high_index = low_index + 1u;
const auto low = scalar(low_index);
const auto high = high_index < mem.component_count
? scalar(high_index)
: (integer ? ConstantU32(ctx.state, 0) : ZeroF32(ctx.state));
if (integer) {
const auto mask = ConstantU32(ctx.state, 0xffffu);
packed[word] = Binary(
ctx.state, OpBitwiseOr, TypeU32(ctx.state),
Binary(ctx.state, OpBitwiseAnd, TypeU32(ctx.state), low, mask),
Binary(ctx.state, OpShiftLeftLogical, TypeU32(ctx.state),
Binary(ctx.state, OpBitwiseAnd, TypeU32(ctx.state), high, mask),
ConstantU32(ctx.state, 16u)));
} else {
const auto pair = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction(
{OpCompositeConstruct, TypeF32Vector(ctx.state, 2), pair, low, high});
packed[word] = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction({OpExtInst, TypeU32(ctx.state), packed[word],
GlslStd450(ctx.state), GlslPackHalf2x16, pair});
}
}
const auto result = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction({OpCompositeConstruct, TypeU32Vector(ctx.state, 4), result,
packed[0], packed[1], packed[2], packed[3]});
return result;
}
uint32_t component[4] {};
for (uint32_t index = 0; index < 4u; index++) {
if (dref) {
@@ -319,9 +368,21 @@ uint32_t StoreTexel(ValueEmitContext& ctx, const IR::MemoryInfo& mem, uint32_t d
const auto packed_index = DmaskComponentIndex(dmask, source);
raw = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction(
{OpCompositeExtract, TypeU32(ctx.state), raw, data, packed_index});
{OpCompositeExtract, TypeU32(ctx.state), raw, data,
mem.data_bits == 16u ? packed_index / 2u : packed_index});
if (mem.data_bits == 16u) {
if ((packed_index & 1u) != 0u) {
raw = Binary(ctx.state, OpShiftRightLogical, TypeU32(ctx.state), raw,
ConstantU32(ctx.state, 16u));
}
raw = Binary(ctx.state, OpBitwiseAnd, TypeU32(ctx.state), raw,
ConstantU32(ctx.state, 0xffffu));
}
}
values[component] = integer ? raw : Unary(ctx.state, OpBitcast, TypeF32(ctx.state), raw);
values[component] = integer ? raw
: mem.data_bits == 16u ? EmitF16BitsToF32(ctx.state, raw)
: Unary(ctx.state, OpBitcast,
TypeF32(ctx.state), raw);
}
const auto texel = ctx.state.builder.AllocateId();
ctx.state.builder.AddFunction(
@@ -407,7 +468,7 @@ bool EmitValueImage(ValueEmitContext& ctx, const IR::Inst& inst) {
integer ? TypeU32Vector(state, 4) : TypeF32Vector(state, 4), color,
image, coord, ImageOperandsLodMask, LodU32(ctx, mem, *address, view)});
}
return ResultVector(ctx, color, integer, false);
return ResultVector(ctx, color, integer, false, mem);
}));
return true;
}
@@ -459,7 +520,7 @@ bool EmitValueImage(ValueEmitContext& ctx, const IR::Inst& inst) {
words.push_back(PackedOffset(ctx, mem, *address, layout, view));
}
state.builder.AddFunction(words);
ctx.Define(inst, ResultVector(ctx, sample, integer && !dref, false));
ctx.Define(inst, ResultVector(ctx, sample, integer && !dref, false, mem, true));
return true;
}
const bool explicit_lod = HasFlag(mem, Decoder::ImageSampleFlagDerivative) ||
@@ -509,7 +570,7 @@ bool EmitValueImage(ValueEmitContext& ctx, const IR::Inst& inst) {
};
const auto& image = state.program.info.images[mem.resource];
if (image.indirect_root != mem.resource) {
ctx.Define(inst, ResultVector(ctx, EmitSample(mem.resource), integer, dref));
ctx.Define(inst, ResultVector(ctx, EmitSample(mem.resource), integer, dref, mem));
return true;
}
const auto* handle = image_arg.ResolveInstruction();
@@ -600,7 +661,7 @@ bool EmitValueImage(ValueEmitContext& ctx, const IR::Inst& inst) {
}
EmitLabel(state, merge_label);
state.builder.AddFunction(phi_words);
ctx.Define(inst, ResultVector(ctx, phi_words[2], integer, dref));
ctx.Define(inst, ResultVector(ctx, phi_words[2], integer, dref, mem));
return true;
}
const auto atomic_opcode = ImageAtomicOpcode(op);