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shader: give an A16 bias its own address VGPR

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Co-authored-by: shadowbeat070 <70843316+shadowbeat070@users.noreply.github.com>
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nmzikandshadowbeat070 committed 2026-10-27 04:23:01 +01:00
1 parent ffa3992c1a
commit 04bfd9070c
2 files changed
+53 -30
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src/graphics/shader/recompiler/frontend/decode/ImageOps.cpp
+9 -21
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@@ -320,27 +320,15 @@ uint32_t CountDmaskComponents(uint32_t dmask) {
} // namespace
ImageAddressComponent ImageAddressComponentLayout(uint32_t flags, uint32_t component) {
const auto width = [flags](uint32_t index) {
if ((flags & ImageSampleFlagA16) == 0u) return 32u;
uint32_t cursor = 0;
if ((flags & ImageSampleFlagOffset) != 0u) {
if (index == cursor++) return 32u;
}
if ((flags & ImageSampleFlagBias) != 0u) {
if (index == cursor++) return 16u;
}
if ((flags & ImageSampleFlagCompare) != 0u && index == cursor) return 32u;
return 16u;
};
uint32_t offset = 0;
for (uint32_t index = 0; index < component; index++) {
const auto bits = width(index);
if (bits == 32u) offset = (offset + 31u) & ~31u;
offset += bits;
}
const auto bits = width(component);
if (bits == 32u) offset = (offset + 31u) & ~31u;
return {offset, bits};
if ((flags & ImageSampleFlagA16) == 0u) return {component * 32u, 32u};
// A16 offsets, bias and PCF reference each take a whole VGPR, the bias as a half in its low
// 16 bits; the components after them pack two per VGPR.
const bool has_bias = (flags & ImageSampleFlagBias) != 0u;
const uint32_t bias_index = (flags & ImageSampleFlagOffset) != 0u ? 1u : 0u;
const uint32_t whole_vgprs = std::popcount(
flags & (ImageSampleFlagOffset | ImageSampleFlagBias | ImageSampleFlagCompare));
if (component >= whole_vgprs) return {(whole_vgprs + component) * 16u, 16u};
return {component * 32u, has_bias && component == bias_index ? 16u : 32u};
}
uint32_t ImageAddressDwordCount(uint32_t flags, uint32_t components) {