LIST2.C

/* 
 * (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) 
{ 
    if (!h) return; 
    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); 
}