/*************************************************************
 *                                                           *
 * 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_