bsnes/higan/ws/system/video.cpp

auto System::configureVideo() -> void {
  Emulator::video.reset();
  Emulator::video.setInterface(interface);
  configureVideoPalette();
  configureVideoEffects();
}

auto System::configureVideoPalette() -> void {
  Emulator::video.setPalette(1 << 12, [&](uint32 color) -> uint64 {
    uint b = color.bits(0, 3);
    uint g = color.bits(4, 7);
    uint r = color.bits(8,11);

    uint64_t R = image::normalize(r, 4, 16);
    uint64_t G = image::normalize(g, 4, 16);
    uint64_t B = image::normalize(b, 4, 16);

    if(settings.colorEmulation) {
      R = (r * 26 + g *  4 + b *  2);
      G = (         g * 24 + b *  8);
      B = (r *  6 + g *  4 + b * 22);
      R = image::normalize(min(480, R), 9, 16);
      G = image::normalize(min(480, G), 9, 16);
      B = image::normalize(min(480, B), 9, 16);
    }

    return R << 32 | G << 16 | B << 0;
  });
}

auto System::configureVideoEffects() -> void {
  Emulator::video.setEffect(Emulator::Video::Effect::InterframeBlending, settings.blurEmulation);
}