/* $Id: rail.c,v 1.98 2008/04/06 22:59:38 pb Exp $ */

#include <math.h>
#include <stdlib.h>

#define GL_GLEXT_PROTOTYPES

#include <GL/gl.h>
#include <GL/glext.h>
#include <GL/glut.h>
#include <sys/time.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <float.h>

static int screen_width, screen_height;

unsigned int tsin = 2;
float v[] = { 0,0,0, 1,1,1, 2,2,2, 3,3,3 };
unsigned short i[] = { 0, 1, 2,
		       1, 2, 3 };
GLsizei tsci[2] = { 3, 3 };
unsigned short *tsfi[2];

static void
drawfunc(void)
{
    tsfi[0] = &i[0];
    tsfi[1] = &i[3];

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glEnableClientState(GL_VERTEX_ARRAY);
    glInterleavedArrays(GL_V3F, 0, v);

    glMultiDrawElements(GL_TRIANGLE_STRIP, tsci, GL_UNSIGNED_SHORT,
			(void *)tsfi, tsin);
    glutSwapBuffers();
}

static void idle_visible()
{
    glutPostRedisplay();
}

/* new window size or exposure */
static void
reshape(int width, int height)
{
  screen_width = width;
  screen_height = height;
  glViewport(0, 0, (GLint) width, (GLint) height);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

static void
init()
{
  glClearColor(.5, .5, .9, 1.0);
}

void 
visible(int vis)
{
    glutIdleFunc(idle_visible);
}

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DEPTH|GLUT_DOUBLE);
    glutInitWindowPosition(0, 0);
    glutInitWindowSize(200, 200);
    glutCreateWindow("Test glMultiDrawElements");

    glutDisplayFunc(drawfunc);
    glutReshapeFunc(reshape);
    glutVisibilityFunc(visible);

    printf("Vendor: %s\n", glGetString(GL_VENDOR));
    printf("Renderer: %s\n", glGetString(GL_RENDERER));
    printf("Version: %s\n", glGetString(GL_VERSION));
    printf("Extensions: %s\n", glGetString(GL_EXTENSIONS));
    printf("GLU Version: %s\n", gluGetString(GLU_VERSION));
    printf("GLU Extensions: %s\n", gluGetString(GLU_EXTENSIONS));

    fflush(stdout);

    init();
    glutMainLoop();
    return 0;
}