COLORMAT.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
/* 
 *  colormat.c 
 *  After initialization, the program will be in  
 *  ColorMaterial mode.  Pressing the mouse buttons  
 *  will change the color of the diffuse reflection. 
 */ 
#include "glos.h" 
 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <GL/glaux.h> 
 
void myinit(void); 
void CALLBACK changeRedDiffuse (void); 
void CALLBACK changeGreenDiffuse (void); 
void CALLBACK changeBlueDiffuse (void); 
void CALLBACK myReshape(GLsizei w, GLsizei h); 
void CALLBACK display(void); 
 
GLfloat diffuseMaterial[4] = { 0.5, 0.5, 0.5, 1.0 }; 
 
/*  Initialize values for material property, light source,  
 *  lighting model, and depth buffer.   
 */ 
void myinit(void) 
{ 
    GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; 
 
    glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMaterial); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); 
    glMaterialf(GL_FRONT, GL_SHININESS, 25.0); 
    glLightfv(GL_LIGHT0, GL_POSITION, light_position); 
 
    glEnable(GL_LIGHTING); 
    glEnable(GL_LIGHT0); 
    glDepthFunc(GL_LESS); 
    glEnable(GL_DEPTH_TEST); 
 
    glColorMaterial(GL_FRONT, GL_DIFFUSE); 
    glEnable(GL_COLOR_MATERIAL); 
} 
 
void CALLBACK changeRedDiffuse (void) 
{ 
    diffuseMaterial[0] += 0.1; 
    if (diffuseMaterial[0] > 1.0) 
    diffuseMaterial[0] = 0.0; 
    glColor4fv(diffuseMaterial); 
} 
 
void CALLBACK changeGreenDiffuse (void) 
{ 
    diffuseMaterial[1] += 0.1; 
    if (diffuseMaterial[1] > 1.0) 
    diffuseMaterial[1] = 0.0; 
    glColor4fv(diffuseMaterial); 
} 
 
void CALLBACK changeBlueDiffuse (void) 
{ 
    diffuseMaterial[2] += 0.1; 
    if (diffuseMaterial[2] > 1.0) 
    diffuseMaterial[2] = 0.0; 
    glColor4fv(diffuseMaterial); 
} 
 
void CALLBACK display(void) 
{ 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    auxSolidSphere(1.0); 
    glFlush(); 
} 
 
void CALLBACK myReshape(GLsizei w, GLsizei h) 
{ 
    if (!h) return; 
    glViewport(0, 0, w, h); 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    if (w <= h)  
    glOrtho (-1.5, 1.5, -1.5*(GLfloat)h/(GLfloat)w,  
        1.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0); 
    else  
    glOrtho (-1.5*(GLfloat)w/(GLfloat)h,  
        1.5*(GLfloat)w/(GLfloat)h, -1.5, 1.5, -10.0, 10.0); 
    glMatrixMode(GL_MODELVIEW); 
    glLoadIdentity(); 
} 
 
int main(int argc, char** argv) 
{ 
    auxInitDisplayMode (AUX_SINGLE | AUX_RGB | AUX_DEPTH16); 
    auxInitPosition (0, 0, 500, 500); 
    auxInitWindow ("ColorMaterial Mode"); 
    myinit(); 
    auxKeyFunc(AUX_R, changeRedDiffuse); 
    auxKeyFunc(AUX_r, changeRedDiffuse); 
    auxKeyFunc(AUX_G, changeGreenDiffuse); 
    auxKeyFunc(AUX_g, changeGreenDiffuse); 
    auxKeyFunc(AUX_B, changeBlueDiffuse); 
    auxKeyFunc(AUX_b, changeBlueDiffuse); 
    auxReshapeFunc (myReshape); 
    auxMainLoop(display); 
    return(0); 
}