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Draw acceleration: Replace multiplication for component sizes with left shift

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wheremyfoodat 2024-11-20 13:40:00 +02:00 • committed by GitHub
parent 0e94eae483
commit bea7b00c7d
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1 changed files with 7 additions and 3 deletions
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10
src/core/PICA/draw_acceleration.cpp
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@ -90,7 +90,11 @@ void GPU::getAcceleratedDrawInfo(PICA::DrawAcceleration& accel, bool indexed) {
const u32 size = (attribInfo >> 2) + 1; // Total number of components
// Size of each component based on the attribute type
static constexpr u32 sizePerComponent[4] = {1, 1, 2, 4};
[[maybe_unused]] static constexpr u32 sizePerComponent[4] = {1, 1, 2, 4};
// To avoid a multiplication, instead of multiplying by the above values, we shift left instead
// So multiplication by 1 becomes a shift by 0, mul by 2 becomes a shift by 1, and mul by 4 becomes a shift by 2
static constexpr u32 sizeShiftPerComponent[4] = {0, 0, 1, 2};
const u32 inputReg = (inputAttrCfg >> (attributeIndex * 4)) & 0xf;
// Mark the attribute as enabled
accel.enabledAttributeMask |= 1 << inputReg;
@ -100,7 +104,7 @@ void GPU::getAcceleratedDrawInfo(PICA::DrawAcceleration& accel, bool indexed) {
attr.offset = attributeOffset + loaderOffset;
attr.stride = loaderData.size;
attr.type = attribType;
attributeOffset += size * sizePerComponent[attribType];
attributeOffset += size << sizeShiftPerComponent[attribType];
}
loaderOffset += loader.size;
@ -134,4 +138,4 @@ void GPU::getAcceleratedDrawInfo(PICA::DrawAcceleration& accel, bool indexed) {
}
accel.canBeAccelerated = true;
}
}