127 lines
4.0 KiB
C++
127 lines
4.0 KiB
C++
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// ****************************************************************************
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//
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// VGA colors and palettes
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//
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// ****************************************************************************
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#include "include.h"
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// default 16-color palettes (EGA colors)
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// - do not set "const", to stay in faster RAM
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u8 DefPal16[16] = {
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CGACOL_0, // 0 // 0x000000 black
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CGACOL_1, // 2 // 0x0000AA dark blue
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CGACOL_2, // 20 // 0x00B600 dark green
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CGACOL_3, // 22 // 0x00B6AA dark cyan
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CGACOL_4, // 160 // 0xB60000 dark red
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CGACOL_5, // 162 // 0xB600AA dark magenta
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CGACOL_6, // 168 // 0xB64900 brown
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CGACOL_7, // 182 // 0xB6B6AA light gray
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CGACOL_8, // 73 // 0x494955 dark gray
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CGACOL_9, // 75 // 0x4949FF light blue
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CGACOL_10, // 93 // 0x49FF55 light green
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CGACOL_11, // 95 // 0x49FFFF light cyan
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CGACOL_12, // 233 // 0xFF4955 light red
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CGACOL_13, // 235 // 0xFF49FF light magenta
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CGACOL_14, // 253 // 0xFFFF55 yellow
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CGACOL_15, // 255 // 0xFFFFFF white
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};
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// ZX Spectrum color palettes
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// - do not set "const", to stay in faster RAM
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u8 ZXPal16[16] = {
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ZXCOL_0, // 0 // 0x000000 black
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ZXCOL_1, // 2 // 0x0000AA dark blue
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ZXCOL_2, // 160 // 0xB60000 dark red
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ZXCOL_3, // 162 // 0xB600AA dark magenta
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ZXCOL_4, // 20 // 0x00B600 dark green
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ZXCOL_5, // 22 // 0x00B6AA dark cyan
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ZXCOL_6, // 180 // 0xB6B600 dark yellow
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ZXCOL_7, // 182 // 0xB6B6AA light gray
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ZXCOL_8, // 73 // 0x494955 dark gray
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ZXCOL_9, // 3 // 0x0000FF light blue
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ZXCOL_10, // 224 // 0xFF0000 light red
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ZXCOL_11, // 227 // 0xFF00FF light magenta
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ZXCOL_12, // 28 // 0x00FF00 light green
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ZXCOL_13, // 31 // 0x00FFFF light cyan
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ZXCOL_14, // 252 // 0xFFFF00 yellow
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ZXCOL_15, // 255 // 0xFFFFFF white
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};
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// 4-color palettes (CGA colors)
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u8 PalCGA1[4] = { CGACOL_0, CGACOL_2, CGACOL_4, CGACOL_6 }; // palette 0, low intensity (black, dark green, brown)
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u8 PalCGA2[4] = { CGACOL_0, CGACOL_10, CGACOL_12, CGACOL_14 }; // palette 0, high intensity (black, light green, light red, yellow)
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u8 PalCGA3[4] = { CGACOL_0, CGACOL_3, CGACOL_5, CGACOL_7 }; // palette 1, low intensity (black, dark cyan, dark magenta, light gray)
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u8 PalCGA4[4] = { CGACOL_0, CGACOL_11, CGACOL_13, CGACOL_15 }; // palette 1, high intensity (black, light cyan, light magenta, white)
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u8 PalCGA5[4] = { CGACOL_0, CGACOL_3, CGACOL_4, CGACOL_7 }; // palette 1, low intensity (black, dark cyan, dark red, light gray)
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u8 PalCGA6[4] = { CGACOL_0, CGACOL_11, CGACOL_12, CGACOL_15 }; // palette 1, high intensity (black, light cyan, light red, white)
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// 4-color palette translation table
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//u32 Pal4Trans[256];
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//u32 Pal4Plane[256];
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// 16-color palette translation table
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//u16 Pal16Trans[256];
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//u16 ZX16Trans[256];
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// values of color components
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u8 RGVal[8] = { 0, 41, 84, 117, 166, 195, 230, 255 }; // values of Red and Green components
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u8 BVal[4] = { 0, 84, 195, 255 }; // values of Blue components
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// distance of 2 colors in 332 format (R3G3B2)
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// - returns value 0..195075
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int ColDist(u8 col1, u8 col2)
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{
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int d = RGVal[col1 >> 5] - RGVal[col2 >> 5];
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int dist = d*d;
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d = RGVal[(col1 >> 2) & 7] - RGVal[(col2 >> 2) & 7];
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dist += d*d;
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d = BVal[col1 & 3] - BVal[col2 & 3];
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dist += d*d;
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return dist;
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}
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// rainbow gradient table
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// GP0 ... B0 ... VGA B0 blue
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// GP1 ... B1 ... VGA B1
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// GP2 ... B2 ... VGA G0 green
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// GP3 ... B3 ... VGA G1
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// GP4 ... B4 ... VGA G2
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// GP5 ... B5 ... VGA R0 red
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// GP6 ... B6 ... VGA R1
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// GP7 ... B7 ... VGA R2
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u8 RainbowGrad[] = {
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B7, // dark red
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B5+B6+B7, // red
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B4+B6+B7, // orange
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B2+B3+B4+B5+B6+B7, // yellow
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B2+B3+B4+B7, // yellow-green
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B2+B3+B4, // green
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B0+B3+B4, // green-cyan
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B0+B1+B2+B3+B4, // cyan
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B0+B1+B4, // cyan-blue
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B0+B1, // blue
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B0+B1+B6, // blue-magenta
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B0+B1+B5+B6+B7, // magenta
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B1+B7, // dark magenta
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};
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#define RANBOW_NUM count_of(RainbowGrad)
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// generate gradient
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void GenGrad(u8* dst, int w)
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{
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// sample - rainbow pattern
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int i;
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for (i = 0; i < w; i++)
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{
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*dst++ = RainbowGrad[i*RANBOW_NUM/w];
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}
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}
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