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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <linux/fb.h>
#include <GL/gl.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, OriginalColorMap;
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-(RedColorMap[i]>>shift));
val += abs(g-(GreenColorMap[i]>>shift));
val += abs(b-(BlueColorMap[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(FixedInfo.visual == FB_VISUAL_TRUECOLOR)
return;
if (ioctl(FrameBufferFD, FBIOPUTCMAP, (void *) &ColorMap) < 0)
sprintf(exiterror, "ioctl(FBIOPUTCMAP) failed!\n");
}
void LoadColorMap(void)
{
if(FixedInfo.visual == FB_VISUAL_TRUECOLOR)
return;
ColorMap.start = 0;
ColorMap.red = RedColorMap;
ColorMap.green = GreenColorMap;
ColorMap.blue = BlueColorMap;
ColorMap.transp = NULL;
if(DisplayMode & GLUT_INDEX) {
ColorMap.len = 256;
if (ioctl(FrameBufferFD, FBIOGETCMAP, (void *) &ColorMap) < 0)
sprintf(exiterror, "ioctl(FBIOGETCMAP) failed!\n");
FillReverseColorMap();
} else {
int rcols = 1 << VarInfo.red.length;
int gcols = 1 << VarInfo.green.length;
int bcols = 1 << VarInfo.blue.length;
int i;
ColorMap.len = gcols;
for (i = 0; i < rcols ; i++)
RedColorMap[i] = (65536/(rcols-1)) * i;
for (i = 0; i < gcols ; i++)
GreenColorMap[i] = (65536/(gcols-1)) * i;
for (i = 0; i < bcols ; i++)
BlueColorMap[i] = (65536/(bcols-1)) * i;
RestoreColorMap();
}
}
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)
{
}
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