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xn65/framework/common/packedvalue.cpp
2024-06-03 21:55:09 -03:00

38 lines
1.1 KiB
C++

#include "xna/common/packedvalue.hpp"
namespace xna {
Uint PackUtils::PackUnsigned(float bitmask, float value) {
return static_cast<Uint>(ClampAndRound(value, 0.0f, bitmask));
}
Uint PackUtils::PackSigned(Uint bitmask, float value) {
const auto max = static_cast<float>(bitmask >> 1);
const auto min = -max - 1.0F;
return static_cast<Uint>(ClampAndRound(value, min, max)) & bitmask;
}
Uint PackUtils::PackUNorm(float bitmask, float value) {
value *= bitmask;
return static_cast<Uint>(ClampAndRound(value, 0.0f, bitmask));
}
Uint PackUtils::PackSNorm(Uint bitmask, float value) {
const auto max = static_cast<float>(bitmask >> 1);
value *= max;
return static_cast<Uint>(ClampAndRound(value, -max, max)) & bitmask;
}
double PackUtils::ClampAndRound(float value, float min, float max) {
if (isnan(value))
return 0.0;
if (isinf(value))
return value < 0 ? static_cast<double>(min) : static_cast<double>(max);
if (value < min)
return static_cast<double>(min);
return value > max ? static_cast<double>(max) : std::round(static_cast<double>(value));
}
}