jurjen.ladeniusandClaude Opus 4.8
f3340e86c6
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
//_____________________________________________________________________________
|
||
// ▄▄ ▄ ▄ ▄▄▄ ▄▄ ▄ ▄
|
||
// ██ ▀ ██▀█ ▀█▄ ▀█▄▀ ▄ ▄█▄█ ▄▀██
|
||
// ▀█▄▀ ██ █ ▄▄█▀ ██ █ ██ ██ █ ▀██
|
||
//_______________________________▀▀____________________________________________
|
||
//
|
||
// by Guillaume "Aoineko" Blanchard (aoineko@free.fr)
|
||
// available on GitHub (https://github.com/aoineko-fr/MSXimg)
|
||
// under CC-BY-AS license (https://creativecommons.org/licenses/by-sa/2.0/)
|
||
|
||
#include "color.h"
|
||
|
||
u32 PaletteMSX1[16] = { 0x000000, 0x000000, 0x3EB849, 0x74D07D, 0x5955E0, 0x8076F1, 0xB95E51, 0x65DBEF, 0xDB6559, 0xFF897D, 0xCCC35E, 0xDED087, 0x3AA241, 0xB766B5, 0xCCCCCC, 0xFFFFFF };
|
||
u32 PaletteMSX2[16] = { 0x000000, 0x000000, 0x3EB849, 0x74D07D, 0x5955E0, 0x8076F1, 0xB95E51, 0x65DBEF, 0xDB6559, 0xFF897D, 0xCCC35E, 0xDED087, 0x3AA241, 0xB766B5, 0xCCCCCC, 0xFFFFFF };
|
||
|
||
const bool bNativeBlueScale = false;
|
||
const bool bNativeGammeCorrection = false;
|
||
// MSX monitor generally has a gamma of 2.5, while on a PC the usual colourspace is sRGB nowadays, with a gamma of 2.2.
|
||
// So, in order to get the correct colors displayed on your PC, you’ll have to apply a gamma correction of 2.2 / 2.5 = 0.88 to the palette.
|
||
// http://map.grauw.nl/articles/vdp_guide.php
|
||
|
||
// Convert RGB24 to GRB8
|
||
GRB8::GRB8(RGB24 color)
|
||
{
|
||
i32 r, g, b;
|
||
|
||
r = ((18 + color.R) * 7 / 255) & 0x07;
|
||
g = ((18 + color.G) * 7 / 255) & 0x07;
|
||
if (bNativeBlueScale)
|
||
{
|
||
switch (((18 + color.B) * 7 / 255) & 0x07)
|
||
{
|
||
case 0:
|
||
b = 0;
|
||
case 1:
|
||
case 2:
|
||
b = 1;
|
||
case 3:
|
||
case 4:
|
||
b = 2;
|
||
case 5:
|
||
case 6:
|
||
case 7:
|
||
b = 3;
|
||
}
|
||
}
|
||
else // use linear scale
|
||
{
|
||
b = ((42 + color.B) * 3 / 255) & 0x03;
|
||
}
|
||
|
||
RGB = u8((g << 5) + (r << 2) + b);
|
||
}
|
||
|
||
// Convert GRB16 to RGB24
|
||
GRB16::GRB16(RGB24 color)
|
||
{
|
||
i32 r, g, b;
|
||
|
||
r = ((4 + color.R) * 31 / 255) & 0x1F;
|
||
g = ((4 + color.G) * 31 / 255) & 0x1F;
|
||
b = ((4 + color.B) * 31 / 255) & 0x1F;
|
||
|
||
RGB = u16((g << 10) + (r << 5) + b);
|
||
}
|
||
|
||
// Convert GRB8 to RGB24
|
||
RGB24::RGB24(GRB8 color)
|
||
{
|
||
i32 r, g, b;
|
||
|
||
r = color / 32;
|
||
g = (color & 0x1C) / 4;
|
||
b = color & 0x03;
|
||
|
||
R = u8(r * 255 / 7);
|
||
G = u8(g * 255 / 7);
|
||
B = u8(b * 255 / 3);
|
||
} |