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https://github.com/rodamaral/lsnes.git
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87 lines
2.4 KiB
C++
Executable file
87 lines
2.4 KiB
C++
Executable file
#include <nes/nes.hpp>
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#define VIDEO_CPP
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namespace NES {
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Video video;
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unsigned Video::palette30(
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unsigned n, double saturation, double hue,
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double contrast, double brightness, double gamma
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) {
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signed 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 = [](signed p, signed color) { return (color + p + 8) % 12 < 6; };
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for(signed p = 0; p < 12; p++) {
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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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return (uclamp<10>(1023.0 * gammaAdjust(y + 0.946882 * i + 0.623557 * q)) << 20)
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+ (uclamp<10>(1023.0 * gammaAdjust(y + -0.274788 * i + -0.635691 * q)) << 10)
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+ (uclamp<10>(1023.0 * gammaAdjust(y + -1.108545 * i + 1.709007 * q)) << 0);
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}
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void Video::generate(Format format) {
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for(unsigned n = 0; n < (1 << 9); n++) palette[n] = palette30(n, 2.0, 0.0, 1.0, 1.0, 1.8);
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if(format == Format::RGB24) {
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for(unsigned n = 0; n < (1 << 9); n++) {
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unsigned color = palette[n];
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palette[n] = ((color >> 6) & 0xff0000) + ((color >> 4) & 0x00ff00) + ((color >> 2) & 0x0000ff);
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}
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}
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if(format == Format::RGB16) {
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for(unsigned n = 0; n < (1 << 9); n++) {
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unsigned color = palette[n];
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palette[n] = ((color >> 14) & 0xf800) + ((color >> 9) & 0x07e0) + ((color >> 5) & 0x001f);
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}
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}
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if(format == Format::RGB15) {
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for(unsigned n = 0; n < (1 << 9); n++) {
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unsigned color = palette[n];
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palette[n] = ((color >> 15) & 0x7c00) + ((color >> 10) & 0x03e0) + ((color >> 5) & 0x001f);
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}
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}
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}
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Video::Video() {
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palette = new unsigned[1 << 9];
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}
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Video::~Video() {
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delete[] palette;
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}
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}
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