astc: Move Replicate to a constexpr LUT when possible
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@ -628,12 +628,14 @@ static void FillError(u32* outBuf, u32 blockWidth, u32 blockHeight) {
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// Replicates low numBits such that [(toBit - 1):(toBit - 1 - fromBit)]
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// is the same as [(numBits - 1):0] and repeats all the way down.
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template <typename IntType>
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static IntType Replicate(IntType val, u32 numBits, u32 toBit) {
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if (numBits == 0)
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static constexpr IntType Replicate(IntType val, u32 numBits, u32 toBit) {
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if (numBits == 0) {
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return 0;
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if (toBit == 0)
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}
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if (toBit == 0) {
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return 0;
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IntType v = val & static_cast<IntType>((1 << numBits) - 1);
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}
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const IntType v = val & static_cast<IntType>((1 << numBits) - 1);
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IntType res = v;
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u32 reslen = numBits;
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while (reslen < toBit) {
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@ -650,6 +652,34 @@ static IntType Replicate(IntType val, u32 numBits, u32 toBit) {
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return res;
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}
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static constexpr std::size_t NumReplicateEntries(u32 num_bits) {
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return std::size_t(1) << num_bits;
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}
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template <typename IntType, u32 num_bits, u32 to_bit>
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static constexpr auto MakeReplicateTable() {
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std::array<IntType, NumReplicateEntries(num_bits)> table{};
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for (IntType value = 0; value < static_cast<IntType>(std::size(table)); ++value) {
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table[value] = Replicate(value, num_bits, to_bit);
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}
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return table;
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}
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static constexpr auto REPLICATE_BYTE_TO_16_TABLE = MakeReplicateTable<u32, 8, 16>();
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static constexpr u32 ReplicateByteTo16(std::size_t value) {
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return REPLICATE_BYTE_TO_16_TABLE[value];
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}
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static constexpr auto REPLICATE_BIT_TO_7_TABLE = MakeReplicateTable<u32, 1, 7>();
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static constexpr u32 ReplicateBitTo7(std::size_t value) {
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return REPLICATE_BIT_TO_7_TABLE[value];
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}
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static constexpr auto REPLICATE_BIT_TO_9_TABLE = MakeReplicateTable<u32, 1, 9>();
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static constexpr u32 ReplicateBitTo9(std::size_t value) {
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return REPLICATE_BIT_TO_9_TABLE[value];
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}
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class Pixel {
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protected:
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using ChannelType = s16;
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@ -833,7 +863,7 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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u32 A = 0, B = 0, C = 0, D = 0;
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// A is just the lsb replicated 9 times.
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A = Replicate(bitval & 1, 1, 9);
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A = ReplicateBitTo9(bitval & 1);
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switch (val.encoding) {
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// Replicate bits
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@ -956,7 +986,7 @@ static u32 UnquantizeTexelWeight(const IntegerEncodedValue& val) {
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u32 bitval = val.bit_value;
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u32 bitlen = val.num_bits;
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u32 A = Replicate(bitval & 1, 1, 7);
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u32 A = ReplicateBitTo7(bitval & 1);
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u32 B = 0, C = 0, D = 0;
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u32 result = 0;
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@ -1562,9 +1592,9 @@ static void DecompressBlock(const u8 inBuf[16], const u32 blockWidth, const u32
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Pixel p;
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for (u32 c = 0; c < 4; c++) {
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u32 C0 = endpos32s[partition][0].Component(c);
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C0 = Replicate(C0, 8, 16);
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C0 = ReplicateByteTo16(C0);
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u32 C1 = endpos32s[partition][1].Component(c);
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C1 = Replicate(C1, 8, 16);
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C1 = ReplicateByteTo16(C1);
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u32 plane = 0;
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if (weightParams.m_bDualPlane && (((planeIdx + 1) & 3) == c)) {
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