ACCANTI.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
/*  accanti.c 
 */ 
#include "glos.h" 
 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <GL/glaux.h> 
#include "jitter.h" 
 
void myinit(void); 
void CALLBACK myReshape(GLsizei w, GLsizei h); 
void CALLBACK display(void); 
 
/*  Initialize lighting and other values. 
 */ 
void myinit(void) 
{ 
    GLfloat mat_ambient[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat light_position[] = { 0.0, 0.0, 10.0, 1.0 }; 
    GLfloat lm_ambient[] = { 0.2, 0.2, 0.2, 1.0 }; 
 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialf(GL_FRONT, GL_SHININESS, 50.0); 
    glLightfv(GL_LIGHT0, GL_POSITION, light_position); 
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lm_ambient); 
     
    glEnable(GL_LIGHTING); 
    glEnable(GL_LIGHT0); 
    glDepthFunc(GL_LESS); 
    glEnable(GL_DEPTH_TEST); 
    glShadeModel (GL_FLAT); 
 
    glClearColor(0.0, 0.0, 0.0, 0.0); 
    glClearAccum(0.0, 0.0, 0.0, 0.0); 
} 
 
void displayObjects(void)  
{ 
    GLfloat torus_diffuse[] = { 0.7, 0.7, 0.0, 1.0 }; 
    GLfloat cube_diffuse[] = { 0.0, 0.7, 0.7, 1.0 }; 
    GLfloat sphere_diffuse[] = { 0.7, 0.0, 0.7, 1.0 }; 
    GLfloat octa_diffuse[] = { 0.7, 0.4, 0.4, 1.0 }; 
     
    glPushMatrix (); 
    glRotatef (30.0, 1.0, 0.0, 0.0); 
 
    glPushMatrix (); 
    glTranslatef (-0.80, 0.35, 0.0);  
    glRotatef (100.0, 1.0, 0.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, torus_diffuse); 
    auxSolidTorus (0.275, 0.85); 
    glPopMatrix (); 
 
    glPushMatrix (); 
    glTranslatef (-0.75, -0.50, 0.0);  
    glRotatef (45.0, 0.0, 0.0, 1.0); 
    glRotatef (45.0, 1.0, 0.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, cube_diffuse); 
    auxSolidCube (1.5); 
    glPopMatrix (); 
 
    glPushMatrix (); 
    glTranslatef (0.75, 0.60, 0.0);  
    glRotatef (30.0, 1.0, 0.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, sphere_diffuse); 
    auxSolidSphere (1.0); 
    glPopMatrix (); 
 
    glPushMatrix (); 
    glTranslatef (0.70, -0.90, 0.25);  
    glMaterialfv(GL_FRONT, GL_DIFFUSE, octa_diffuse); 
    auxSolidOctahedron (1.0); 
    glPopMatrix (); 
 
    glPopMatrix (); 
} 
 
#define ACSIZE  8 
 
void CALLBACK display(void) 
{ 
    GLint viewport[4]; 
    int jitter; 
 
    glGetIntegerv (GL_VIEWPORT, viewport); 
 
    glClear(GL_ACCUM_BUFFER_BIT); 
    for (jitter = 0; jitter < ACSIZE; jitter++) { 
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
        glPushMatrix (); 
/*  Note that 4.5 is the distance in world space between 
 *  left and right and bottom and top. 
 *  This formula converts fractional pixel movement to  
 *  world coordinates. 
 */ 
        glTranslatef (j8[jitter].x*4.5/viewport[2], 
            j8[jitter].y*4.5/viewport[3], 0.0); 
        displayObjects (); 
        glPopMatrix (); 
        glAccum(GL_ACCUM, 1.0/ACSIZE); 
        glFlush(); 
        auxSwapBuffers(); 
    } 
    glAccum (GL_RETURN, 1.0); 
    glFlush(); 
    auxSwapBuffers(); 
} 
 
void CALLBACK myReshape(GLsizei w, GLsizei h) 
{ 
    if (!h) return; 
    glViewport(0, 0, w, h); 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    if (w <= h)  
    glOrtho (-2.25, 2.25, -2.25*h/w, 2.25*h/w, -10.0, 10.0); 
    else  
    glOrtho (-2.25*w/h, 2.25*w/h, -2.25, 2.25, -10.0, 10.0); 
    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_DOUBLE | AUX_RGB 
            | AUX_ACCUM | AUX_DEPTH16); 
    auxInitPosition (0, 0, 250, 250); 
    auxInitWindow ("Jittering - Orthographic"); 
    myinit(); 
    auxReshapeFunc (myReshape); 
    auxMainLoop(display); 
    return(0); 
}