/*************************************************************
 *                                                           *
 * file  : EXT_paletted_texture.h                            *
 * author: Jens Schneider                                    *
 * date  : 14.Mar.2001-10.Jul.2001                           *
 * e-mail: jens@glHint.de                                    *
 *                                                           *
 * version 1.0ß                                              *
 *                                                           *
 *************************************************************/  
    
#ifndef __EXT_paletted_texture_H_
#define __EXT_paletted_texture_H_
    
/*
 *  GLOBAL SWITCHES - enable/disable advanced features of this header
 *
 */ 
#define EXT_PALETTED_TEXTURE_INITIALIZE 1	// enable generic init-routines
#ifndef _WIN32
#define GL_GLEXT_PROTOTYPES 1
#endif /* 
 */
    
#ifdef __cplusplus
extern "C"
{
  
#endif				/* 
 */
  
#if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__)
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif				/* 
 */
  
#ifndef APIENTRY
#define APIENTRY
#endif				/* 
 */
  

// Header file version number, required by OpenGL ABI for Linux
//#define GL_GLEXT_VERSION 7
  

/* 
 * NEW TOKENS TO OPENGL 1.2.1 
 *
 */ 
#ifndef GL_EXT_paletted_texture
#define GL_COLOR_INDEX1_EXT               0x80E2 
#define GL_COLOR_INDEX2_EXT               0x80E3 
#define GL_COLOR_INDEX4_EXT               0x80E4 
#define GL_COLOR_INDEX8_EXT               0x80E5 
#define GL_COLOR_INDEX12_EXT              0x80E6 
#define GL_COLOR_INDEX16_EXT              0x80E7
#define GL_COLOR_TABLE_FORMAT_EXT         0x80D8 
#define GL_COLOR_TABLE_WIDTH_EXT          0x80D9 
#define GL_COLOR_TABLE_RED_SIZE_EXT       0x80DA 
#define GL_COLOR_TABLE_GREEN_SIZE_EXT     0x80DB 
#define GL_COLOR_TABLE_BLUE_SIZE_EXT      0x80DC 
#define GL_COLOR_TABLE_ALPHA_SIZE_EXT     0x80DD 
#define GL_COLOR_TABLE_LUMINANCE_SIZE_EXT 0x80DE 
#define GL_COLOR_TABLE_INTENSITY_SIZE_EXT 0x80DF
#define GL_TEXTURE_INDEX_SIZE_EXT         0x80ED
#define GL_EXT_paletted_texture 1
#endif				/* 
 */
  
#ifndef _WIN32
#ifdef GL_GLEXT_PROTOTYPES
  extern void APIENTRY glColorTableEXT (GLenum, GLenum, GLsizei, GLenum, GLenum,
      const GLvoid *);
   
extern void APIENTRY glColorSubTableEXT (GLenum, GLsizei, GLsizei, GLenum,
      GLenum, const GLvoid *);
   
extern void APIENTRY glGetColorTableEXT (GLenum, GLenum, GLenum, GLvoid *);
   
extern void APIENTRY glGetColorTableParameterivEXT (GLenum, GLenum,
      GLint *);
   
extern void APIENTRY glGetColorTableParameterfvEXT (GLenum, GLenum,
      GLfloat *);
   
#endif				// GL_GLEXT_PROTOTYPES 
#else				// _WIN32
  typedef void (APIENTRY * PFNGLCOLORTABLEEXTPROC) (GLenum target,
      GLenum internalFormat, GLsizei width, GLenum format, GLenum type,
      const GLvoid * data);
   
typedef void (APIENTRY * PFNGLCOLORSUBTABLEEXTPROC) (GLenum target,
      GLsizei start, GLsizei count, GLenum format, GLenum type,
      const GLvoid * data);
   
typedef void (APIENTRY * PFNGLGETCOLORTABLEEXTPROC) (GLenum target,
      GLenum format, GLenum type, GLvoid * data);
   
typedef void (APIENTRY *
      PFNGLGETCOLORTABLEPARAMETERIVEXTPROC) (GLenum target, GLenum pname,
      GLint * params);
   
typedef void (APIENTRY *
      PFNGLGETCOLORTABLEPARAMETERFVEXTPROC) (GLenum target, GLenum pname,
      GLfloat * params);
   
#endif				// not _WIN32
   
#ifdef EXT_PALETTED_TEXTURE_INITIALIZE
#include<string.h>		// string manipulation for runtime-check
   
#ifdef _WIN32
    PFNGLCOLORTABLEEXTPROC glColorTableEXT = NULL;
   
PFNGLCOLORSUBTABLEEXTPROC glColorSubTableEXT = NULL;
   
PFNGLGETCOLORTABLEEXTPROC glGetColorTableEXT = NULL;
   
PFNGLGETCOLORTABLEPARAMETERIVEXTPROC glGetColorTableParameterivEXT = NULL;
   
PFNGLGETCOLORTABLEPARAMETERFVEXTPROC glGetColorTableParameterfvEXT = NULL;
   
#endif				// _WIN32
   
int CheckForEXTPalettedTextureSupport (void)
  {
    
const char search[] = "GL_EXT_paletted_texture";
     
int i, pos = 0;
     
int maxpos = strlen (search) - 1;
     
char extensions[10000];
     
strcpy (extensions, (const char *) glGetString (GL_EXTENSIONS));
     
int len = strlen (extensions);
     
for (i = 0; i < len; i++)
    {
      
if ((i == 0) || ((i > 1) && extensions[i - 1] == ' ')) {
	
pos = 0;
	
while (extensions[i] != ' ')
	{
	  
if (extensions[i] == search[pos])
	    pos++;
	  
if ((pos > maxpos) && extensions[i + 1] == ' ') {
	    
		//printf(search);
		//printf(" supported.\n");
		return 1;
	  
}
	   
i++;
	
}
      
}
    
}
    
	//printf(search);
	//printf(" not supported.\n");
	return 0;
  
}
  

int GL_EXT_paletted_texture_Init (void)
  {
    
if (!CheckForEXTPalettedTextureSupport ())
      return 0;
    

#ifdef _WIN32
	glColorTableEXT =
	(PFNGLCOLORTABLEEXTPROC) wglGetProcAddress ("glColorTableEXT");
    
if (glColorTableEXT == NULL) {
      fprintf (stderr, "glColorTableEXT not found.\n");
      return 0;
    }
    
glColorSubTableEXT =
	(PFNGLCOLORSUBTABLEEXTPROC) wglGetProcAddress ("glColorSubTableEXT");
    
if (glColorSubTableEXT == NULL) {
      fprintf (stderr, "glColorSubTableEXT not found.\n");
      return 0;
    }
    
glGetColorTableEXT =
	(PFNGLGETCOLORTABLEEXTPROC) wglGetProcAddress ("glGetColorTableEXT");
    
if (glGetColorTableEXT == NULL) {
      fprintf (stderr, "glGetColorTableEXT not found.\n");
      return 0;
    }
    
glGetColorTableParameterivEXT = (PFNGLGETCOLORTABLEPARAMETERIVEXTPROC)
	wglGetProcAddress ("glGetColorTableParameterivEXT");
    
if (glGetColorTableParameterivEXT == NULL) {
      fprintf (stderr, "glGetColorTableParameterivEXT not found.\n");
      return 0;
    }
    
glGetColorTableParameterfvEXT = (PFNGLGETCOLORTABLEPARAMETERFVEXTPROC)
	wglGetProcAddress ("glGetColorTableParameterfvEXT");
    
if (glGetColorTableParameterfvEXT == NULL) {
      fprintf (stderr, "glGetColorTableParameterfvEXT not found.\n");
      return 0;
    }
    
#endif // _WIN32
	return 1;
  
}
  

#endif // EXT_PALETTED_TEXTURE_INITIALIZE
      
#ifdef __cplusplus
}


#endif /* 
 */
    
#endif // not __EXT_PALETTED_TEXTURE_H_