mirror of https://github.com/bsnes-emu/bsnes.git
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
auto System::configureVideo() -> void {
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Emulator::video.reset();
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Emulator::video.setInterface(interface);
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configureVideoPalette();
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}
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auto System::configureVideoPalette() -> void {
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auto generateColor = [](uint n, double saturation, double hue, double contrast, double brightness, double gamma) -> uint64 {
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int color = (n & 0x0f), level = color < 0xe ? (n >> 4) & 3 : 1;
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static const double black = 0.518, white = 1.962, attenuation = 0.746;
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static const double levels[8] = {
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0.350, 0.518, 0.962, 1.550,
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1.094, 1.506, 1.962, 1.962,
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};
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double lo_and_hi[2] = {
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levels[level + 4 * (color == 0x0)],
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levels[level + 4 * (color < 0xd)],
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};
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double y = 0.0, i = 0.0, q = 0.0;
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auto wave = [](int p, int color) { return (color + p + 8) % 12 < 6; };
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for(int p : range(12)) {
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double spot = lo_and_hi[wave(p, color)];
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if(((n & 0x040) && wave(p, 12))
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|| ((n & 0x080) && wave(p, 4))
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|| ((n & 0x100) && wave(p, 8))
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) spot *= attenuation;
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double v = (spot - black) / (white - black);
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v = (v - 0.5) * contrast + 0.5;
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v *= brightness / 12.0;
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y += v;
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i += v * std::cos((3.141592653 / 6.0) * (p + hue));
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q += v * std::sin((3.141592653 / 6.0) * (p + hue));
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}
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i *= saturation;
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q *= saturation;
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auto gammaAdjust = [=](double f) { return f < 0.0 ? 0.0 : std::pow(f, 2.2 / gamma); };
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uint64 r = uclamp<16>(65535.0 * gammaAdjust(y + 0.946882 * i + 0.623557 * q));
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uint64 g = uclamp<16>(65535.0 * gammaAdjust(y + -0.274788 * i + -0.635691 * q));
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uint64 b = uclamp<16>(65535.0 * gammaAdjust(y + -1.108545 * i + 1.709007 * q));
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return r << 32 | g << 16 | b << 0;
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};
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Emulator::video.setPalette(1 << 9, [&](uint32 color) -> uint64 {
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auto gamma = settings.colorEmulation ? 1.8 : 2.2;
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return generateColor(color, 2.0, 0.0, 1.0, 1.0, gamma);
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});
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}
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