/*
 * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * This is a port of the infamous "glxgears" demo to straight EGL
 * Port by Dane Rushton 10 July 2005
 *
 * No command line options.
 * Program runs for 5 seconds then exits, outputing framerate to console
 */
#define MAXFRAME    5
#define PFINISH     1

#include <stdio.h>
#include <math.h>
#include <GL/gl.h>
#include <GL/glut.h>

static GLuint win_width = 256;
static GLuint win_height = 230;
static GLuint frames = 0;

static void draw(void)
{
#if PFINISH
    fprintf(stderr, "EE CLEAR -----------------------------------------------------\n");
#endif
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
#if PFINISH
    glFinish();
    fprintf(stderr, "EE CLEAR _____________________________________________________\n");
#endif

#if PFINISH
    fprintf(stderr, "EE DRAW ------------------------------------------------------\n");
#endif
    glBegin(GL_TRIANGLES);
    glColor3f(0,0,1); 
    glVertex3f( 0.9, -0.9, -30.0);
    glColor3f(1,0,0); 
    glVertex3f( 0.9,  0.9, -30.0);
    glColor3f(0,1,0); 
    glVertex3f(-0.9,  0.0, -30.0);
    glEnd();
#if PFINISH
    glFinish();
    fprintf(stderr, "EE DRAW ______________________________________________________\n");
#endif

    glutSwapBuffers();

    frames++;
    if (frames >= MAXFRAME) {
        glFinish();
        exit(0);
    }
}

static void idle(void)
{
    static double t0 = -1.;
    double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
    if (t0 < 0.0)
        t0 = t;
    dt = t - t0;
    t0 = t;

    glutPostRedisplay();
}

/* new window size or exposure */
static void reshape(int width, int height)
{
    glViewport(0, 0, (GLint)width, (GLint)height);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}


static void init(void)
{
    static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };

    glLightfv(GL_LIGHT0, GL_POSITION, pos);
    glEnable(GL_CULL_FACE);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_NORMALIZE);
}

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_STENCIL);
    glutInitWindowSize(win_width, win_height);

    glutCreateWindow("glgears");

    glutIdleFunc(idle);
    glutReshapeFunc(reshape);
    glutDisplayFunc(draw);

    init();
    reshape(win_width, win_height);
    glDrawBuffer(GL_BACK);
    glutMainLoop();

    return 0;
}