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