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astc: Make InputBitStream constexpr
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0efc230381
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@ -39,25 +39,25 @@ constexpr u32 Popcnt(u32 n) {
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class InputBitStream {
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class InputBitStream {
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public:
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public:
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explicit InputBitStream(const u8* ptr, std::size_t start_offset = 0)
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constexpr explicit InputBitStream(const u8* ptr, std::size_t start_offset = 0)
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: cur_byte(ptr), next_bit(start_offset % 8) {}
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: cur_byte{ptr}, next_bit{start_offset % 8} {}
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std::size_t GetBitsRead() const {
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constexpr std::size_t GetBitsRead() const {
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return m_BitsRead;
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return bits_read;
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}
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}
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u32 ReadBit() {
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constexpr bool ReadBit() {
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u32 bit = *cur_byte >> next_bit++;
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const bool bit = (*cur_byte >> next_bit++) & 1;
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while (next_bit >= 8) {
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while (next_bit >= 8) {
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next_bit -= 8;
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next_bit -= 8;
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cur_byte++;
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cur_byte++;
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}
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}
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m_BitsRead++;
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bits_read++;
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return bit & 1;
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return bit;
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}
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}
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u32 ReadBits(std::size_t nBits) {
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constexpr u32 ReadBits(std::size_t nBits) {
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u32 ret = 0;
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u32 ret = 0;
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for (std::size_t i = 0; i < nBits; ++i) {
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for (std::size_t i = 0; i < nBits; ++i) {
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ret |= (ReadBit() & 1) << i;
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ret |= (ReadBit() & 1) << i;
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@ -66,7 +66,7 @@ public:
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}
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}
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template <std::size_t nBits>
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template <std::size_t nBits>
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u32 ReadBits() {
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constexpr u32 ReadBits() {
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u32 ret = 0;
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u32 ret = 0;
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for (std::size_t i = 0; i < nBits; ++i) {
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for (std::size_t i = 0; i < nBits; ++i) {
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ret |= (ReadBit() & 1) << i;
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ret |= (ReadBit() & 1) << i;
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@ -77,7 +77,7 @@ public:
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private:
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private:
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const u8* cur_byte;
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const u8* cur_byte;
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std::size_t next_bit = 0;
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std::size_t next_bit = 0;
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std::size_t m_BitsRead = 0;
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std::size_t bits_read = 0;
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};
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};
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class OutputBitStream {
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class OutputBitStream {
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