MATERIAL.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
/* 
 * material.c 
 * This program demonstrates the use of the GL lighting model. 
 * Several objects are drawn using different material characteristics. 
 * A single light source illuminates the objects. 
 */ 
#include "glos.h" 
 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <GL/glaux.h> 
 
void myinit(void); 
void CALLBACK display(void); 
void CALLBACK myReshape(GLsizei w, GLsizei h); 
 
/*  Initialize z-buffer, projection matrix, light source, 
 *  and lighting model.  Do not specify a material property here. 
 */ 
void myinit(void) 
{ 
    GLfloat ambient[] = { 0.0, 0.0, 0.0, 1.0 }; 
    GLfloat diffuse[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat specular[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat position[] = { 0.0, 3.0, 2.0, 0.0 }; 
    GLfloat lmodel_ambient[] = { 0.4, 0.4, 0.4, 1.0 }; 
    GLfloat local_view[] = { 0.0 }; 
 
    glEnable(GL_DEPTH_TEST); 
    glDepthFunc(GL_LESS); 
 
    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient); 
    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse); 
    glLightfv(GL_LIGHT0, GL_POSITION, position); 
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); 
    glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER, local_view); 
 
    glEnable(GL_LIGHTING); 
    glEnable(GL_LIGHT0); 
 
    glClearColor(0.0, 0.1, 0.1, 0.0); 
} 
 
/*  Draw twelve spheres in 3 rows with 4 columns.   
 *  The spheres in the first row have materials with no ambient reflection. 
 *  The second row has materials with significant ambient reflection. 
 *  The third row has materials with colored ambient reflection. 
 * 
 *  The first column has materials with blue, diffuse reflection only. 
 *  The second column has blue diffuse reflection, as well as specular 
 *  reflection with a low shininess exponent. 
 *  The third column has blue diffuse reflection, as well as specular 
 *  reflection with a high shininess exponent (a more concentrated highlight). 
 *  The fourth column has materials which also include an emissive component. 
 * 
 *  glTranslatef() is used to move spheres to their appropriate locations. 
 */ 
 
void CALLBACK display(void) 
{ 
    GLfloat no_mat[] = { 0.0, 0.0, 0.0, 1.0 }; 
    GLfloat mat_ambient[] = { 0.7, 0.7, 0.7, 1.0 }; 
    GLfloat mat_ambient_color[] = { 0.8, 0.8, 0.2, 1.0 }; 
    GLfloat mat_diffuse[] = { 0.1, 0.5, 0.8, 1.0 }; 
    GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat no_shininess[] = { 0.0 }; 
    GLfloat low_shininess[] = { 5.0 }; 
    GLfloat high_shininess[] = { 100.0 }; 
    GLfloat mat_emission[] = {0.3, 0.2, 0.2, 0.0}; 
 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
 
/*  draw sphere in first row, first column 
 *  diffuse reflection only; no ambient or specular   
 */ 
    glPushMatrix(); 
    glTranslatef (-3.75, 3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat); 
    glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in first row, second column 
 *  diffuse and specular reflection; low shininess; no ambient 
 */ 
    glPushMatrix(); 
    glTranslatef (-1.25, 3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialfv(GL_FRONT, GL_SHININESS, low_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in first row, third column 
 *  diffuse and specular reflection; high shininess; no ambient 
 */ 
    glPushMatrix(); 
    glTranslatef (1.25, 3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in first row, fourth column 
 *  diffuse reflection; emission; no ambient or specular reflection 
 */ 
    glPushMatrix(); 
    glTranslatef (3.75, 3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat); 
    glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in second row, first column 
 *  ambient and diffuse reflection; no specular   
 */ 
    glPushMatrix(); 
    glTranslatef (-3.75, 0.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat); 
    glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in second row, second column 
 *  ambient, diffuse and specular reflection; low shininess 
 */ 
    glPushMatrix(); 
    glTranslatef (-1.25, 0.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialfv(GL_FRONT, GL_SHININESS, low_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in second row, third column 
 *  ambient, diffuse and specular reflection; high shininess 
 */ 
    glPushMatrix(); 
    glTranslatef (1.25, 0.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in second row, fourth column 
 *  ambient and diffuse reflection; emission; no specular 
 */ 
    glPushMatrix(); 
    glTranslatef (3.75, 0.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat); 
    glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in third row, first column 
 *  colored ambient and diffuse reflection; no specular   
 */ 
    glPushMatrix(); 
    glTranslatef (-3.75, -3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat); 
    glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in third row, second column 
 *  colored ambient, diffuse and specular reflection; low shininess 
 */ 
    glPushMatrix(); 
    glTranslatef (-1.25, -3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialfv(GL_FRONT, GL_SHININESS, low_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in third row, third column 
 *  colored ambient, diffuse and specular reflection; high shininess 
 */ 
    glPushMatrix(); 
    glTranslatef (1.25, -3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
/*  draw sphere in third row, fourth column 
 *  colored ambient and diffuse reflection; emission; no specular 
 */ 
    glPushMatrix(); 
    glTranslatef (3.75, -3.0, 0.0); 
    glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color); 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat); 
    glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess); 
    glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission); 
    auxSolidSphere(1.0); 
    glPopMatrix(); 
 
    glFlush(); 
} 
 
void CALLBACK myReshape(GLsizei w, GLsizei h) 
{ 
    if (!h) return; 
    glViewport(0, 0, w, h); 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    if (w <= (h * 2)) 
    glOrtho (-6.0, 6.0, -3.0*((GLfloat)h*2)/(GLfloat)w,  
        3.0*((GLfloat)h*2)/(GLfloat)w, -10.0, 10.0); 
    else 
    glOrtho (-6.0*(GLfloat)w/((GLfloat)h*2),  
        6.0*(GLfloat)w/((GLfloat)h*2), -3.0, 3.0, -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_SINGLE | AUX_RGB | AUX_DEPTH16); 
    auxInitPosition (0, 0, 600, 450); 
    auxInitWindow ("Lighting"); 
    myinit(); 
    auxReshapeFunc (myReshape); 
    auxMainLoop(display); 
    return(0); 
}