mxvk::anonymous_namespace{mxvk_sprite.cpp} Namespace Reference

Functions
uint16_t	float_to_half (float value) noexcept

Function Documentation

float_to_half()

uint16_t mxvk::anonymous_namespace{mxvk_sprite.cpp}::float_to_half ( float value )

nodiscardnoexcept

Definition at line 19 of file mxvk_sprite.cpp.

                                                                   {
            const uint32_t bits = std::bit_cast<uint32_t>(value);
            const uint32_t sign = (bits >> 16U) & 0x8000U;
            int32_t exponent = static_cast<int32_t>((bits >> 23U) & 0xFFU) - 127;
            uint32_t mantissa = bits & 0x7FFFFFU;
            if (exponent < -24) {
                return static_cast<uint16_t>(sign);
            }
            if (exponent < -14) {
                mantissa |= 0x800000U;
                const uint32_t shift = static_cast<uint32_t>(-exponent - 14);
                const uint32_t rounded = (mantissa + (1U << (shift + 12U))) >> (shift + 13U);
                return static_cast<uint16_t>(sign | rounded);
            }
            if (exponent > 15) {
                return static_cast<uint16_t>(sign | 0x7C00U);
            }
            uint32_t half_exponent = static_cast<uint32_t>(exponent + 15);
            mantissa += 0x1000U;
            if ((mantissa & 0x800000U) != 0U) {
                mantissa = 0U;
                ++half_exponent;
            }
            if (half_exponent >= 31U) {
                return static_cast<uint16_t>(sign | 0x7C00U);
            }
            return static_cast<uint16_t>(sign | (half_exponent << 10U) | (mantissa >> 13U));
        }