#ifndef _GLTOOLS_H_
#define _GLTOOLS_H_

/* this is the targa header, pragmas are needed to do the voodoo magic */
/* http://gcc.gnu.org/onlinedocs/gcc-4.4.0/gcc/ */
#pragma pack(1)
typedef struct
{
    GLbyte identsize;   /* Size of id field that follows header (0) */
    GLbyte imageType;   /* 0 = none, 1 = indexed, 2 = rgb, 3 = grey, +8 = rle */
    GLbyte colorMapType;           /* 0 = none, 1 = paletted */
    unsigned short colorMapStart;  /* first colour map entry */
    unsigned short colorMapLength; /* number of colors */
    unsigned char colorMapBits;    /* bits per palette entry */
    unsigned short xstart;         /* image x origin */
    unsigned short ystart;         /* image y origin */
    unsigned short width;          /* width in pixels */
    unsigned short height;         /* height in pixels */
    GLbyte bits;                   /* bits per pixel (8 16, 24, 32) */
    GLbyte descriptor;             /* image descriptor */
} TGAHEADER;
#pragma pack()

/* function prototypes */
GLuint gltLoadTGATexture(const char *);
void gltListExtensions(void);
void gltOpenGLInfo(void);
GLboolean gltQueryExtension(const char *);
GLint gltWriteTGA(const char *);
GLbyte *gltLoadTGA(const char *, GLint *, GLint *, GLint *, GLenum *);
#ifdef _WIN32
char *strsep(char**, const char*);
#endif

static inline void gltErrorCheck(void)
{
    GLenum err_code;
    const GLubyte *err_str;

    while ((err_code = glGetError()) != GL_NO_ERROR)
    {
        err_str = gluErrorString(err_code);
        fprintf(stderr, "OpenGL error: %s\n", err_str);
    }
}

#endif