bsnes/higan/emulator/emulator.cpp

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#include <emulator/emulator.hpp>
namespace Emulator {
auto Interface::videoColor(uint16 r, uint16 g, uint16 b) -> uint32 {
double saturation = 1.0;
double gamma = 1.0;
double luminance = 1.0;
if(saturation != 1.0) {
uint16 grayscale = uclamp<16>((r + g + b) / 3);
double inverse = max(0.0, 1.0 - saturation);
r = uclamp<16>(r * saturation + grayscale * inverse);
g = uclamp<16>(g * saturation + grayscale * inverse);
b = uclamp<16>(b * saturation + grayscale * inverse);
}
if(gamma != 1.0) {
double reciprocal = 1.0 / 32767.0;
r = r > 32767 ? r : uint16(32767 * pow(r * reciprocal, gamma));
g = g > 32767 ? g : uint16(32767 * pow(g * reciprocal, gamma));
b = b > 32767 ? b : uint16(32767 * pow(b * reciprocal, gamma));
}
if(luminance != 1.0) {
r = uclamp<16>(r * luminance);
g = uclamp<16>(g * luminance);
b = uclamp<16>(b * luminance);
}
return 255 << 24 | (r >> 8) << 16 | (g >> 8) << 8 | (b >> 8) << 0;
}
}