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astc: Create a LUT at compile time for encoding values
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@ -161,6 +161,8 @@ private:
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enum class IntegerEncoding { JustBits, Qus32, Trit };
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struct IntegerEncodedValue {
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constexpr IntegerEncodedValue() = default;
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constexpr IntegerEncodedValue(IntegerEncoding encoding_, u32 num_bits_)
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: encoding{encoding_}, num_bits{num_bits_} {}
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@ -179,8 +181,8 @@ struct IntegerEncodedValue {
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return totalBits;
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}
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IntegerEncoding encoding;
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u32 num_bits;
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IntegerEncoding encoding{};
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u32 num_bits = 0;
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u32 bit_value = 0;
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union {
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u32 qus32_value = 0;
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@ -296,7 +298,7 @@ static void DecodeQus32Block(InputBitStream& bits, std::vector<IntegerEncodedVal
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// Returns a new instance of this struct that corresponds to the
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// can take no more than maxval values
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static IntegerEncodedValue CreateEncoding(u32 maxVal) {
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static constexpr IntegerEncodedValue CreateEncoding(u32 maxVal) {
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while (maxVal > 0) {
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u32 check = maxVal + 1;
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@ -322,13 +324,23 @@ static IntegerEncodedValue CreateEncoding(u32 maxVal) {
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return IntegerEncodedValue(IntegerEncoding::JustBits, 0);
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}
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static constexpr std::array<IntegerEncodedValue, 256> MakeEncodedValues() {
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std::array<IntegerEncodedValue, 256> encodings{};
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for (std::size_t i = 0; i < encodings.size(); ++i) {
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encodings[i] = CreateEncoding(static_cast<u32>(i));
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}
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return encodings;
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}
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static constexpr std::array EncodingsValues = MakeEncodedValues();
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// Fills result with the values that are encoded in the given
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// bitstream. We must know beforehand what the maximum possible
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// value is, and how many values we're decoding.
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static void DecodeIntegerSequence(std::vector<IntegerEncodedValue>& result, InputBitStream& bits,
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u32 maxRange, u32 nValues) {
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// Determine encoding parameters
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IntegerEncodedValue val = CreateEncoding(maxRange);
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IntegerEncodedValue val = EncodingsValues[maxRange];
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// Start decoding
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u32 nValsDecoded = 0;
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@ -371,7 +383,7 @@ struct TexelWeightParams {
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nIdxs *= 2;
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}
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return CreateEncoding(m_MaxWeight).GetBitLength(nIdxs);
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return EncodingsValues[m_MaxWeight].GetBitLength(nIdxs);
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}
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u32 GetNumWeightValues() const {
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@ -780,12 +792,12 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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// figure out the max value for each of them...
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u32 range = 256;
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while (--range > 0) {
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IntegerEncodedValue val = CreateEncoding(range);
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IntegerEncodedValue val = EncodingsValues[range];
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u32 bitLength = val.GetBitLength(nValues);
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if (bitLength <= nBitsForColorData) {
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// Find the smallest possible range that matches the given encoding
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while (--range > 0) {
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IntegerEncodedValue newval = CreateEncoding(range);
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IntegerEncodedValue newval = EncodingsValues[range];
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if (!newval.MatchesEncoding(val)) {
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break;
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}
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