// GLAD_DEBUG is only defined if the c-debug generator was used
#ifdef GLAD_DEBUG
// logs every gl call to the console
void pre_gl_call(const char *name, void *funcptr, int len_args, ...) {
    printf("Calling: %s (%d arguments)\n", name, len_args);
}
#endif


int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
    glutInitWindowSize(width, height);
    glutCreateWindow("cookie");

    glutReshapeFunc(reshape);
    glutDisplayFunc(display);

    if(!gladLoadGL()) {
        printf("Something went wrong!\n");
        exit(-1);
    }
    
#ifdef GLAD_DEBUG
    // before every opengl call call pre_gl_call
    glad_set_pre_callback(pre_gl_call);
    
    // post callback checks for glGetError by default
    
    // don't use the callback for glClear
    // (glClear could be replaced with your own function)
    glad_debug_glClear = glad_glClear;
#endif
    
    // gladLoadGLLoader(&glutGetProcAddress);
    printf("OpenGL %d.%d\n", GLVersion.major, GLVersion.minor);
    if (GLVersion.major < 2) {
        printf("Your system doesn't support OpenGL >= 2!\n");
        return -1;
    }

    printf("OpenGL %s, GLSL %s\n", glGetString(GL_VERSION),
           glGetString(GL_SHADING_LANGUAGE_VERSION));

    glutMainLoop();

    return 0;
}

struct gladGLversionStruct {
    int major;
    int minor;
};

extern struct gladGLversionStruct GLVersion;

typedef void* (* GLADloadproc)(const char *name);

/*
 * Load OpenGL using the internal loader.
 * Returns the true/1 if loading succeeded.
 *
 */
int gladLoadGL(void);

/*
 * Load OpenGL using an external loader like SDL_GL_GetProcAddress.
 *
 * Substitute GL with the API you generated
 *
 */
void gladLoadGLLoader(GLADloadproc);

    if(!gladLoadGL()) { exit(-1) };
    printf("OpenGL Version %d.%d loaded", GLVersion.major, GLVersion.minor);
    
    if(GLAD_GL_EXT_framebuffer_multisample) {
        /* GL_EXT_framebuffer_multisample is supported */ 
    }
    
    if(GLAD_GL_VERSION_3_0) {
        /* We support at least OpenGL version 3 */
    }

// this symbol only exists if generated with the c-debug generator
#define GLAD_DEBUG
typedef void (* GLADcallback)(const char *name, void *funcptr, int len_args, ...);

/*
 * Sets a callback which will be called before every function call
 * to a function loaded by glad.
 *
 */
GLAPI void glad_set_pre_callback(GLADcallback cb);

/*
 * Sets a callback which will be called after every function call
 * to a function loaded by glad.
 *
 */
GLAPI void glad_set_post_callback(GLADcallback cb);

void _post_call_callback_default(const char *name, void *funcptr, int len_args, ...) {
    GLenum error_code;
    error_code = glad_glGetError();

    if (error_code != GL_NO_ERROR) {
        fprintf(stderr, "ERROR %d in %s\n", error_code, name);
    }
}