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Diffstat (limited to 'src/glut/fbdev/colormap.c')
| -rw-r--r-- | src/glut/fbdev/colormap.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/glut/fbdev/colormap.c b/src/glut/fbdev/colormap.c new file mode 100644 index 0000000..9a6dea2 --- /dev/null +++ b/src/glut/fbdev/colormap.c @@ -0,0 +1,173 @@ +/* + * Mesa 3-D graphics library + * Version: 6.5 + * Copyright (C) 1995-2006 Brian Paul + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* + * Library for glut using mesa fbdev driver + * + * Written by Sean D'Epagnier (c) 2006 + */ + +#include <stdlib.h> + +#include <linux/fb.h> + +#include <GL/gl.h> +#include <GL/glfbdev.h> +#include <GL/glut.h> + +#include "internal.h" + +#define TOCMAP(x)(unsigned short)((x<0?0:x>1?1:x)*(GLfloat) ((1<<16) - 1)) +#define TORMAP(x)(unsigned short)((x<0?0:x>1?1:x)*(GLfloat)(REVERSECMAPSIZE-1)) +#define FROMCMAP(x) (GLfloat)x / (GLfloat)((1<<16) - 1) + +static struct fb_cmap ColorMap; + +unsigned short RedColorMap[256], GreenColorMap[256], BlueColorMap[256]; + +unsigned char ReverseColorMap[REVERSECMAPSIZE] + [REVERSECMAPSIZE] + [REVERSECMAPSIZE]; + +static void FindReverseMap(int r, int g, int b) +{ + static int count; + int i, shift = 16 - REVERSECMAPSIZELOG; + unsigned int minv = -1, mini = 0; + for(i=0; i<256; i++) { + int val = 0; + val += abs(r-(ColorMap.red[i]>>shift)); + val += abs(g-(ColorMap.green[i]>>shift)); + val += abs(b-(ColorMap.blue[i]>>shift)); + if(val < minv) { + minv = val; + mini = i; + } + } + ReverseColorMap[r][g][b] = mini; +} + +static void FillItemReverseColorMap(int r, int g, int b) +{ + FindReverseMap(r, g, b); + if(r > 0) + FindReverseMap(r-1, g, b); + if(r < REVERSECMAPSIZE - 1) + FindReverseMap(r+1, g, b); + if(g > 0) + FindReverseMap(r, g-1, b); + if(g < REVERSECMAPSIZE - 1) + FindReverseMap(r, g+1, b); + if(b > 0) + FindReverseMap(r, g, b-1); + if(b < REVERSECMAPSIZE - 1) + FindReverseMap(r, g, b+1); +} + +static void FillReverseColorMap(void) +{ + int r, g, b; + for(r = 0; r < REVERSECMAPSIZE; r++) + for(g = 0; g < REVERSECMAPSIZE; g++) + for(b = 0; b < REVERSECMAPSIZE; b++) + FindReverseMap(r, g, b); +} + +void RestoreColorMap(void) +{ + if (ioctl(FrameBufferFD, FBIOPUTCMAP, (void *) &ColorMap) < 0) + sprintf(exiterror, "ioctl(FBIOPUTCMAP) failed!\n"); +} + +void LoadColorMap(void) +{ + /* we're assuming 256 entries here */ + int i; + + ColorMap.start = 0; + ColorMap.len = 256; + ColorMap.red = RedColorMap; + ColorMap.green = GreenColorMap; + ColorMap.blue = BlueColorMap; + ColorMap.transp = NULL; + + if (ioctl(FrameBufferFD, FBIOGETCMAP, (void *) &ColorMap) < 0) + sprintf(exiterror, "ioctl(FBIOGETCMAP) failed!\n"); + + switch(VarInfo.bits_per_pixel) { + case 15: + for(i=0; i<32; i++) + RedColorMap[i] = GreenColorMap[i] = BlueColorMap[i] = i*65535/31; + break; + case 16: + for(i=0; i<32; i++) + RedColorMap[i] = BlueColorMap[i] = i*65535/31; + for(i=0; i<64; i++) + GreenColorMap[i] = i*65535/63; + break; + case 24: + case 32: + for(i=0; i<256; i++) + RedColorMap[i] = GreenColorMap[i] = BlueColorMap[i] = i*257; + break; + } + + RestoreColorMap(); + + if(DisplayMode & GLUT_INDEX) + FillReverseColorMap(); +} + +void glutSetColor(int cell, GLfloat red, GLfloat green, GLfloat blue) +{ + if(cell < 0 || cell >= 256) + return; + + RedColorMap[cell] = TOCMAP(red); + GreenColorMap[cell] = TOCMAP(green); + BlueColorMap[cell] = TOCMAP(blue); + + RestoreColorMap(); + + FillItemReverseColorMap(TORMAP(red), TORMAP(green), TORMAP(blue)); +} + +GLfloat glutGetColor(int cell, int component) +{ + if(!(DisplayMode & GLUT_INDEX)) + return -1.0; + + if(cell < 0 || cell > 256) + return -1.0; + + switch(component) { + case GLUT_RED: + return FROMCMAP(RedColorMap[cell]); + case GLUT_GREEN: + return FROMCMAP(GreenColorMap[cell]); + case GLUT_BLUE: + return FROMCMAP(BlueColorMap[cell]); + } + return -1.0; +} + +void glutCopyColormap(int win) +{ +} |