/*
 * License Applicability. Except to the extent portions of this file are
 * made subject to an alternative license as permitted in the SGI Free
 * Software License B, Version 1.1 (the "License"), the contents of this
 * file are subject only to the provisions of the License. You may not use
 * this file except in compliance with the License. You may obtain a copy
 * of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
 * Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
 * 
 * http://oss.sgi.com/projects/FreeB
 * 
 * Note that, as provided in the License, the Software is distributed on an
 * "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
 * DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
 * CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
 * PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
 * 
 * Original Code. The Original Code is: OpenGL Sample Implementation,
 * Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
 * Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
 * Copyright in any portions created by third parties is as indicated
 * elsewhere herein. All Rights Reserved.
 * 
 * Additional Notice Provisions: The application programming interfaces
 * established by SGI in conjunction with the Original Code are The
 * OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
 * April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
 * 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
 * Window System(R) (Version 1.3), released October 19, 1998. This software
 * was created using the OpenGL(R) version 1.2.1 Sample Implementation
 * published by SGI, but has not been independently verified as being
 * compliant with the OpenGL(R) version 1.2.1 Specification.
 *
 */

/*
 * hello.c
 * This is a simple, introductory OpenGL program.
 */
#include "ug.h"

void display(UGWindow uwin)
{
/* clear all pixels  */
   glClear (GL_COLOR_BUFFER_BIT);

/* draw white polygon (rectangle) with corners at
 * (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0)  
 */
   glColor4f (1.0, 1.0, 1.0, 1.0);
   glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
   glRotatef(10., 0.5, 0.5, 1.0);
//   glTranslatef(-0.25, -0.25, 0);
#if 0   
   glTranslatef(0.25, 0.25, 0);
   glScalef(0.5, 0.5, 1);
   glTranslatef(-0.5, -0.5, 0);
   glScalef(2, 2, 1);
//   glScalef(0.5, 0.5, 1);
   glColor4f (1.0, 1.0, 0, 1.0);
#endif   
   //glRotatef(10, 0, 0, 1.0);
   glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

/* don't wait!  
 * start processing buffered OpenGL routines 
 */
   glFlush ();
   ugSwapBuffers(uwin);
}

void init (void) 
{
   const static GLfloat v[] = {
	0.25, 0.25, 0.0,
	0.75, 0.25, 0.0,
	0.25, 0.75, 0.0,
	0.75, 0.75, 0.0
    };
/* select clearing color 	*/
   glClearColor (0.0, 0.0, 0.0, 0.0);

/* initialize viewing values  */
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrthof(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
   glVertexPointer(3, GL_FLOAT, 0, v);
   glEnableClientState(GL_VERTEX_ARRAY);
}

/* 
 * Declare initial window size, position, and display mode
 * (single buffer and RGBA).  Open window with "hello"
 * in its title bar.  Call initialization routines.
 * Register callback function to display graphics.
 * Enter main loop and process events.
 */
#ifdef FTK_AS_PLUGIN
#include "ftk_app_demo.h"
FTK_HIDE int FTK_MAIN(int argc, char* argv[]);
FtkApp* ftk_app_demo_hellogles_create()
{
	return ftk_app_demo_create(_("helloGLES"), ftk_main);
}
#else
#define FTK_HIDE extern
#endif /*FTK_AS_PLUGIN*/

FTK_HIDE int FTK_MAIN(int argc, char* argv[])
{
   UGCtx ug = ugInit();
   UGWindow uwin = ugCreateWindow (ug, "", "hello", 250, 250, 100, 100);
   init();
   ugDisplayFunc(uwin, display); 
#ifndef FTK_AS_PLUGIN
   ugMainLoop(ug);
#endif   
   return 0;   /* ANSI C requires main to return int. */
}