mirror of https://github.com/bsnes-emu/bsnes.git
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
#include <fc/fc.hpp>
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#include <cmath>
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#define VIDEO_CPP
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namespace Famicom {
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Video video;
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void Video::generate_palette(bool color_emulation) {
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for(unsigned n = 0; n < (1 << 9); n++) palette[n] = generate_color(n, 2.0, 0.0, 1.0, 1.0, color_emulation ? 1.8 : 2.2);
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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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uint32_t Video::generate_color(
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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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unsigned r = 65535.0 * gammaAdjust(y + 0.946882 * i + 0.623557 * q);
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unsigned g = 65535.0 * gammaAdjust(y + -0.274788 * i + -0.635691 * q);
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unsigned b = 65535.0 * gammaAdjust(y + -1.108545 * i + 1.709007 * q);
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return interface->videoColor(n, uclamp<16>(r), uclamp<16>(g), uclamp<16>(b));
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}
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}
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