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Add Helpers:{getBits,getBit}

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`constexpr` functions for extractint bitfields that lends itself a bit
better to emitting instructions like `bextr` on x86 or `ubfx` on arm64.
And may subjectively make things a bit more readable.
"Extract `5` bits" rather than `& 0x1F`.
This commit is contained in:
Wunkolo 2023-06-09 21:28:46 -07:00
parent c7e3343974
commit 2c94d0d683
9 changed files with 180 additions and 147 deletions
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18
include/PICA/shader.hpp
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@ -128,14 +128,14 @@ class PICAShader {
bool negate;
if constexpr (sourceIndex == 1) { // SRC1
negate = ((opDescriptor >> 4) & 1) != 0;
compSwizzle = (opDescriptor >> 5) & 0xff;
negate = (Helpers::getBit<4>(opDescriptor)) != 0;
compSwizzle = Helpers::getBits<5, 8>(opDescriptor);
} else if constexpr (sourceIndex == 2) { // SRC2
negate = ((opDescriptor >> 13) & 1) != 0;
compSwizzle = (opDescriptor >> 14) & 0xff;
negate = (Helpers::getBit<13>(opDescriptor)) != 0;
compSwizzle = Helpers::getBits<14, 8>(opDescriptor);
} else if constexpr (sourceIndex == 3) { // SRC3
negate = ((opDescriptor >> 22) & 1) != 0;
compSwizzle = (opDescriptor >> 23) & 0xff;
negate = (Helpers::getBit<22>(opDescriptor)) != 0;
compSwizzle = Helpers::getBits<23, 8>(opDescriptor);
}
// Iterate through every component of the swizzled vector in reverse order
@ -239,9 +239,9 @@ public:
void uploadIntUniform(int index, u32 word) {
auto& u = intUniforms[index];
u.x() = word & 0xff;
u.y() = (word >> 8) & 0xff;
u.z() = (word >> 16) & 0xff;
u.w() = (word >> 24) & 0xff;
u.y() = Helpers::getBits<8, 8>(word);
u.z() = Helpers::getBits<16, 8>(word);
u.w() = Helpers::getBits<24, 8>(word);
}
void run();