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#include <stdio.h>
#include <stdlib.h>
#include "GL/osmesa.h"
int gl_width=480;
int gl_height=480;
void init(void)
{
GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_DEPTH_TEST);
}
/*
* reshape simply creates an orthographic projection
* within the viewport.
*/
void reshape(int w, int h)
{
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-2.5, 2.5, -2.5, 2.5, -5.0, 5.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void display(void)
{
GLfloat red_mat[] = { 1.0, 0.0, 0.0, 0.5 };
GLfloat green_mat[] = { 0.0, 1.0, 0.0, 0.5 };
GLfloat blue_mat[] = { 0.0, 0.0, 1.0, 0.5};
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glPushMatrix();
glRotatef(20.0, 1.0, 0.0, 0.0);
glPushMatrix();
glTranslatef(-0.75, 0.5, 0.0);
glRotatef(90.0, 1.0, 0.0, 0.0);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat );
auxSolidTorus(0.275, 0.85);
glPopMatrix();
glPushMatrix();
glTranslatef(-0.75, -0.5, 0.0);
glRotatef(270.0, 1.0, 0.0, 0.0);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat );
auxSolidCone(1.0, 2.0);
glPopMatrix();
glPushMatrix();
glTranslatef(0.75, 0.0, -1.0);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
auxSolidSphere(1.0);
glPopMatrix();
glPopMatrix();
}
void render_image(void)
{
init();
reshape(gl_width,gl_height);
display();
}
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