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astc: Make IntegerEncodedValue a trivial structure
This commit is contained in:
ReinUsesLisp
parent
70a31eda62
commit
e183820956
1 changed files with 181 additions and 216 deletions
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@ -160,124 +160,34 @@ private:
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enum class IntegerEncoding { JustBits, Qus32, Trit };
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class IntegerEncodedValue {
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private:
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IntegerEncoding m_Encoding{};
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u32 m_NumBits = 0;
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u32 m_BitValue = 0;
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union {
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u32 m_Qus32Value = 0;
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u32 m_TritValue;
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};
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struct IntegerEncodedValue {
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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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public:
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constexpr IntegerEncodedValue() = default;
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constexpr IntegerEncodedValue(IntegerEncoding encoding, u32 numBits)
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: m_Encoding(encoding), m_NumBits(numBits) {}
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IntegerEncoding GetEncoding() const {
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return m_Encoding;
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}
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u32 BaseBitLength() const {
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return m_NumBits;
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}
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u32 GetBitValue() const {
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return m_BitValue;
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}
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void SetBitValue(u32 val) {
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m_BitValue = val;
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}
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u32 GetTritValue() const {
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return m_TritValue;
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}
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void SetTritValue(u32 val) {
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m_TritValue = val;
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}
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u32 GetQus32Value() const {
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return m_Qus32Value;
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}
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void SetQus32Value(u32 val) {
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m_Qus32Value = val;
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}
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bool MatchesEncoding(const IntegerEncodedValue& other) const {
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return m_Encoding == other.m_Encoding && m_NumBits == other.m_NumBits;
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constexpr bool MatchesEncoding(const IntegerEncodedValue& other) const {
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return encoding == other.encoding && num_bits == other.num_bits;
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}
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// Returns the number of bits required to encode nVals values.
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u32 GetBitLength(u32 nVals) const {
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u32 totalBits = m_NumBits * nVals;
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if (m_Encoding == IntegerEncoding::Trit) {
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u32 totalBits = num_bits * nVals;
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if (encoding == IntegerEncoding::Trit) {
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totalBits += (nVals * 8 + 4) / 5;
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} else if (m_Encoding == IntegerEncoding::Qus32) {
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} else if (encoding == IntegerEncoding::Qus32) {
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totalBits += (nVals * 7 + 2) / 3;
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}
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return totalBits;
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}
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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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while (maxVal > 0) {
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u32 check = maxVal + 1;
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IntegerEncoding encoding;
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u32 num_bits;
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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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u32 trit_value;
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};
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};
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// Is maxVal a power of two?
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if (!(check & (check - 1))) {
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return IntegerEncodedValue(IntegerEncoding::JustBits, Popcnt(maxVal));
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}
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// Is maxVal of the type 3*2^n - 1?
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if ((check % 3 == 0) && !((check / 3) & ((check / 3) - 1))) {
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return IntegerEncodedValue(IntegerEncoding::Trit, Popcnt(check / 3 - 1));
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}
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// Is maxVal of the type 5*2^n - 1?
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if ((check % 5 == 0) && !((check / 5) & ((check / 5) - 1))) {
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return IntegerEncodedValue(IntegerEncoding::Qus32, Popcnt(check / 5 - 1));
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}
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// Apparently it can't be represented with a bounded s32eger sequence...
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// just iterate.
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maxVal--;
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}
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return IntegerEncodedValue(IntegerEncoding::JustBits, 0);
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}
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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,
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InputBitStream& bits, u32 maxRange, u32 nValues) {
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// Determine encoding parameters
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IntegerEncodedValue val = IntegerEncodedValue::CreateEncoding(maxRange);
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// Start decoding
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u32 nValsDecoded = 0;
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while (nValsDecoded < nValues) {
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switch (val.GetEncoding()) {
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case IntegerEncoding::Qus32:
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DecodeQus32Block(bits, result, val.BaseBitLength());
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nValsDecoded += 3;
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break;
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case IntegerEncoding::Trit:
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DecodeTritBlock(bits, result, val.BaseBitLength());
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nValsDecoded += 5;
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break;
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case IntegerEncoding::JustBits:
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val.SetBitValue(bits.ReadBits(val.BaseBitLength()));
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result.push_back(val);
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nValsDecoded++;
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break;
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}
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}
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}
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private:
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static void DecodeTritBlock(InputBitStream& bits, std::vector<IntegerEncodedValue>& result,
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u32 nBitsPerValue) {
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// Implement the algorithm in section C.2.12
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@ -330,11 +240,10 @@ private:
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t[0] = (Cb[1] << 1) | (Cb[0] & ~Cb[1]);
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}
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for (u32 i = 0; i < 5; i++) {
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IntegerEncodedValue val(IntegerEncoding::Trit, nBitsPerValue);
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val.SetBitValue(m[i]);
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val.SetTritValue(t[i]);
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result.push_back(val);
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for (std::size_t i = 0; i < 5; ++i) {
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IntegerEncodedValue& val = result.emplace_back(IntegerEncoding::Trit, nBitsPerValue);
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val.bit_value = m[i];
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val.trit_value = t[i];
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}
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}
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@ -378,14 +287,71 @@ private:
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}
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}
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for (u32 i = 0; i < 3; i++) {
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IntegerEncodedValue val(IntegerEncoding::Qus32, nBitsPerValue);
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val.m_BitValue = m[i];
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val.m_Qus32Value = q[i];
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for (std::size_t i = 0; i < 3; ++i) {
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IntegerEncodedValue& val = result.emplace_back(IntegerEncoding::Qus32, nBitsPerValue);
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val.bit_value = m[i];
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val.qus32_value = q[i];
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}
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}
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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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while (maxVal > 0) {
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u32 check = maxVal + 1;
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// Is maxVal a power of two?
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if (!(check & (check - 1))) {
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return IntegerEncodedValue(IntegerEncoding::JustBits, Popcnt(maxVal));
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}
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// Is maxVal of the type 3*2^n - 1?
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if ((check % 3 == 0) && !((check / 3) & ((check / 3) - 1))) {
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return IntegerEncodedValue(IntegerEncoding::Trit, Popcnt(check / 3 - 1));
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}
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// Is maxVal of the type 5*2^n - 1?
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if ((check % 5 == 0) && !((check / 5) & ((check / 5) - 1))) {
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return IntegerEncodedValue(IntegerEncoding::Qus32, Popcnt(check / 5 - 1));
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}
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// Apparently it can't be represented with a bounded s32eger sequence...
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// just iterate.
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maxVal--;
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}
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return IntegerEncodedValue(IntegerEncoding::JustBits, 0);
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}
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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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// Start decoding
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u32 nValsDecoded = 0;
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while (nValsDecoded < nValues) {
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switch (val.encoding) {
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case IntegerEncoding::Qus32:
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DecodeQus32Block(bits, result, val.num_bits);
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nValsDecoded += 3;
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break;
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case IntegerEncoding::Trit:
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DecodeTritBlock(bits, result, val.num_bits);
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nValsDecoded += 5;
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break;
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case IntegerEncoding::JustBits:
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val.bit_value = bits.ReadBits(val.num_bits);
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result.push_back(val);
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nValsDecoded++;
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break;
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}
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}
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}
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};
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namespace ASTCC {
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@ -405,7 +371,7 @@ struct TexelWeightParams {
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nIdxs *= 2;
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}
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return IntegerEncodedValue::CreateEncoding(m_MaxWeight).GetBitLength(nIdxs);
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return CreateEncoding(m_MaxWeight).GetBitLength(nIdxs);
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}
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u32 GetNumWeightValues() const {
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@ -814,12 +780,12 @@ 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 = IntegerEncodedValue::CreateEncoding(range);
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IntegerEncodedValue val = CreateEncoding(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 = IntegerEncodedValue::CreateEncoding(range);
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IntegerEncodedValue newval = CreateEncoding(range);
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if (!newval.MatchesEncoding(val)) {
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break;
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}
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@ -834,7 +800,7 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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// We now have enough to decode our s32eger sequence.
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std::vector<IntegerEncodedValue> decodedColorValues;
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InputBitStream colorStream(data);
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IntegerEncodedValue::DecodeIntegerSequence(decodedColorValues, colorStream, range, nValues);
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DecodeIntegerSequence(decodedColorValues, colorStream, range, nValues);
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// Once we have the decoded values, we need to dequantize them to the 0-255 range
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// This procedure is outlined in ASTC spec C.2.13
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@ -846,8 +812,8 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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}
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const IntegerEncodedValue& val = *itr;
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u32 bitlen = val.BaseBitLength();
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u32 bitval = val.GetBitValue();
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u32 bitlen = val.num_bits;
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u32 bitval = val.bit_value;
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assert(bitlen >= 1);
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@ -855,7 +821,7 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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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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switch (val.GetEncoding()) {
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switch (val.encoding) {
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// Replicate bits
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case IntegerEncoding::JustBits:
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out[outIdx++] = Replicate(bitval, bitlen, 8);
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@ -864,7 +830,7 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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// Use algorithm in C.2.13
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case IntegerEncoding::Trit: {
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D = val.GetTritValue();
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D = val.trit_value;
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switch (bitlen) {
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case 1: {
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@ -915,7 +881,7 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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case IntegerEncoding::Qus32: {
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D = val.GetQus32Value();
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D = val.qus32_value;
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switch (bitlen) {
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case 1: {
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@ -956,9 +922,9 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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} // switch(bitlen)
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} // case IntegerEncoding::Qus32
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break;
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} // switch(val.GetEncoding())
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} // switch(val.encoding)
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if (val.GetEncoding() != IntegerEncoding::JustBits) {
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if (val.encoding != IntegerEncoding::JustBits) {
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u32 T = D * C + B;
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T ^= A;
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T = (A & 0x80) | (T >> 2);
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@ -973,20 +939,20 @@ static void DecodeColorValues(u32* out, u8* data, const u32* modes, const u32 nP
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}
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static u32 UnquantizeTexelWeight(const IntegerEncodedValue& val) {
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u32 bitval = val.GetBitValue();
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u32 bitlen = val.BaseBitLength();
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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 B = 0, C = 0, D = 0;
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u32 result = 0;
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switch (val.GetEncoding()) {
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switch (val.encoding) {
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case IntegerEncoding::JustBits:
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result = Replicate(bitval, bitlen, 6);
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break;
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case IntegerEncoding::Trit: {
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D = val.GetTritValue();
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D = val.trit_value;
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assert(D < 3);
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switch (bitlen) {
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@ -1018,7 +984,7 @@ static u32 UnquantizeTexelWeight(const IntegerEncodedValue& val) {
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} break;
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case IntegerEncoding::Qus32: {
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D = val.GetQus32Value();
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D = val.qus32_value;
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assert(D < 5);
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switch (bitlen) {
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@ -1044,7 +1010,7 @@ static u32 UnquantizeTexelWeight(const IntegerEncodedValue& val) {
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} break;
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}
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if (val.GetEncoding() != IntegerEncoding::JustBits && bitlen > 0) {
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if (val.encoding != IntegerEncoding::JustBits && bitlen > 0) {
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// Decode the value...
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result = D * C + B;
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result ^= A;
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@ -1562,8 +1528,7 @@ static void DecompressBlock(const u8 inBuf[16], const u32 blockWidth, const u32
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std::vector<IntegerEncodedValue> texelWeightValues;
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InputBitStream weightStream(texelWeightData);
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IntegerEncodedValue::DecodeIntegerSequence(texelWeightValues, weightStream,
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weightParams.m_MaxWeight,
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DecodeIntegerSequence(texelWeightValues, weightStream, weightParams.m_MaxWeight,
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weightParams.GetNumWeightValues());
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// Blocks can be at most 12x12, so we can have as many as 144 weights
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