mirror of https://github.com/bsnes-emu/bsnes.git
86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
#include <fc/fc.hpp>
|
|
#include <cmath>
|
|
|
|
#define VIDEO_CPP
|
|
namespace Famicom {
|
|
|
|
Video video;
|
|
|
|
Video::Video() {
|
|
palette = new uint32_t[1 << 9]();
|
|
}
|
|
|
|
Video::~Video() {
|
|
delete[] palette;
|
|
}
|
|
|
|
auto Video::generate_palette(Emulator::Interface::PaletteMode mode) -> void {
|
|
for(auto color : range(1 << 9)) {
|
|
if(mode == Emulator::Interface::PaletteMode::Literal) {
|
|
palette[color] = color;
|
|
} else if(mode == Emulator::Interface::PaletteMode::Channel) {
|
|
uint emphasis = (color >> 6) & 7;
|
|
uint luma = (color >> 4) & 3;
|
|
uint chroma = (color >> 0) & 15;
|
|
emphasis = image::normalize(emphasis, 3, 16);
|
|
luma = image::normalize(luma, 2, 16);
|
|
chroma = image::normalize(chroma, 4, 16);
|
|
palette[color] = interface->videoColor(color, 0, emphasis, luma, chroma);
|
|
} else if(mode == Emulator::Interface::PaletteMode::Standard) {
|
|
palette[color] = generate_color(color, 2.0, 0.0, 1.0, 1.0, 2.2);
|
|
} else if(mode == Emulator::Interface::PaletteMode::Emulation) {
|
|
palette[color] = generate_color(color, 2.0, 0.0, 1.0, 1.0, 1.8);
|
|
}
|
|
}
|
|
}
|
|
|
|
auto Video::generate_color(
|
|
uint n, double saturation, double hue,
|
|
double contrast, double brightness, double gamma
|
|
) -> uint32 {
|
|
int color = (n & 0x0f), level = color < 0xe ? (n >> 4) & 3 : 1;
|
|
|
|
static const double black = 0.518, white = 1.962, attenuation = 0.746;
|
|
static const double levels[8] = {
|
|
0.350, 0.518, 0.962, 1.550,
|
|
1.094, 1.506, 1.962, 1.962,
|
|
};
|
|
|
|
double lo_and_hi[2] = {
|
|
levels[level + 4 * (color == 0x0)],
|
|
levels[level + 4 * (color < 0xd)],
|
|
};
|
|
|
|
double y = 0.0, i = 0.0, q = 0.0;
|
|
auto wave = [](int p, int color) { return (color + p + 8) % 12 < 6; };
|
|
for(int p : range(12)) {
|
|
double spot = lo_and_hi[wave(p, color)];
|
|
|
|
if(((n & 0x040) && wave(p, 12))
|
|
|| ((n & 0x080) && wave(p, 4))
|
|
|| ((n & 0x100) && wave(p, 8))
|
|
) spot *= attenuation;
|
|
|
|
double v = (spot - black) / (white - black);
|
|
|
|
v = (v - 0.5) * contrast + 0.5;
|
|
v *= brightness / 12.0;
|
|
|
|
y += v;
|
|
i += v * std::cos((3.141592653 / 6.0) * (p + hue));
|
|
q += v * std::sin((3.141592653 / 6.0) * (p + hue));
|
|
}
|
|
|
|
i *= saturation;
|
|
q *= saturation;
|
|
|
|
auto gammaAdjust = [=](double f) { return f < 0.0 ? 0.0 : std::pow(f, 2.2 / gamma); };
|
|
uint r = 65535.0 * gammaAdjust(y + 0.946882 * i + 0.623557 * q);
|
|
uint g = 65535.0 * gammaAdjust(y + -0.274788 * i + -0.635691 * q);
|
|
uint b = 65535.0 * gammaAdjust(y + -1.108545 * i + 1.709007 * q);
|
|
|
|
return interface->videoColor(n, 0, uclamp<16>(r), uclamp<16>(g), uclamp<16>(b));
|
|
}
|
|
|
|
}
|