/*
 * (c) Copyright 1993, Silicon Graphics, Inc.
 *               1993-1995 Microsoft Corporation
 *
 * ALL RIGHTS RESERVED
 *
 * Please refer to OpenGL/readme.txt for additional information
 *
 */

/*
 *  list2.c
 *  This program demonstrates glGenList() and glPushAttrib().
 *  The matrix and color are restored, before the line is drawn.
 */
#include "glos.h"

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glaux.h>

void myinit(void);
void drawLine (void);
void CALLBACK display(void);
void CALLBACK myReshape(GLsizei w, GLsizei h);

GLuint listName;

void myinit (void)
{
    GLfloat color_vector[3] = {1.0, 0.0, 0.0};

    listName = glGenLists (1);
    glNewList (listName, GL_COMPILE);
    glPushAttrib (GL_CURRENT_BIT);
    glColor3fv (color_vector);
    glBegin (GL_TRIANGLES);
    glVertex2f (0.0, 0.0);
    glVertex2f (1.0, 0.0);
    glVertex2f (0.0, 1.0);
    glEnd ();
    glTranslatef (1.5, 0.0, 0.0);
    glPopAttrib ();
    glEndList ();
    glShadeModel (GL_FLAT);
}

void drawLine (void)
{
    glBegin (GL_LINES);
    glVertex2f (0.0, 0.5);
    glVertex2f (15.0, 0.5);
    glEnd ();
}

void CALLBACK display(void)
{
    GLuint i;
    GLfloat new_color[3] = {0.0, 1.0, 0.0};

    glClear (GL_COLOR_BUFFER_BIT);
    glColor3fv (new_color);
    glPushMatrix ();
    for (i = 0; i < 10; i++)
    glCallList (listName);
    glPopMatrix ();
    drawLine ();
    glFlush ();
}

void CALLBACK myReshape(GLsizei w, GLsizei h)
{
    h = (h == 0) ? 1 : h;
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if (w <= h) 
    gluOrtho2D (0.0, 2.0, -0.5 * (GLfloat) h/(GLfloat) w, 
        1.5 * (GLfloat) h/(GLfloat) w);
    else 
    gluOrtho2D (0.0, 2.0 * (GLfloat) w/(GLfloat) h, -0.5, 1.5); 
    glMatrixMode(GL_MODELVIEW);
}

/*  Main Loop
 *  Open window with initial window size, title bar, 
 *  RGBA display mode, and handle input events.
 */
int main(int argc, char** argv)
{
    auxInitDisplayMode (AUX_SINGLE | AUX_RGB);
    auxInitPosition (0, 0, 400, 50);
    auxInitWindow ("Display List");
    myinit();
    auxReshapeFunc (myReshape);
    auxMainLoop(display);
    return(0);
}
