OpenGL Stipple

This is a discussion on OpenGL Stipple within the C++ Programming forums, part of the General Programming Boards category; I'm trying to stipple the red part of this tetrahedron with "fly" but the stipple doesn't show up. What am ...

  1. #1
    Registered User rogue's Avatar
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    OpenGL Stipple

    I'm trying to stipple the red part of this tetrahedron with "fly" but the stipple doesn't show up. What am I missing?
    Code:
    #include <stdlib.h>
    #include <GL/glut.h>
    
    /* initial tetrahedron */
    
    GLfloat v[4][3]={{0.0, 0.0, 1.0}, {0.0, 0.942809, -0.33333},
          {-0.816497, -0.471405, -0.333333}, {0.816497, -0.471405, -0.333333}};
    
    GLfloat colors[4][3] = {{1.0, 0.0, 0.0}, {0.0, 1.0, 0.0},
                            {0.0, 0.0, 1.0}, {0.0, 0.0, 0.0}};
    
    int n;
    
    void triangle(GLfloat *va, GLfloat *vb, GLfloat *vc)
    {
    	   glVertex3fv(va);
           glVertex3fv(vb);
           glVertex3fv(vc);
    }
    
    void tetra(GLfloat *a, GLfloat *b, GLfloat *c, GLfloat *d)
    {
    		GLubyte fly[] = {
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x03, 0x80, 0x01, 0xC0, 0x06, 0xC0, 0x03, 0x60, 
          0x04, 0x60, 0x06, 0x20, 0x04, 0x30, 0x0C, 0x20, 
          0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,
          0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xC0, 0x22, 
          0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 
          0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
          0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 
          0x66, 0x01, 0x80, 0x66, 0x33, 0x01, 0x80, 0xCC, 
          0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30,
          0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0, 
          0x03, 0x31, 0x8c, 0xc0, 0x03, 0x33, 0xcc, 0xc0, 
          0x10, 0x63, 0xC6, 0x08, 0x10, 0x30, 0x0c, 0x08, 
          0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};
    
    	glClear (GL_COLOR_BUFFER_BIT);
    	
        glColor3fv(colors[0]);
    	
    	glEnable (GL_POLYGON_STIPPLE);
    	glPolygonStipple (fly);	
        triangle(a, b, c);
    	
    	glDisable (GL_POLYGON_STIPPLE);
        
    	glColor3fv(colors[1]);
        triangle(a, c, d);
        
    	glColor3fv(colors[2]);
        triangle(a, d, b);
        
    	glColor3fv(colors[3]);
        triangle(b, d, c);
    }
    void mouse(int btn, int state, int x, int y)
    {
        if(btn==GLUT_RIGHT_BUTTON && state==GLUT_DOWN)   exit(0);
    }
    void divide_tetra(GLfloat *a, GLfloat *b, GLfloat *c, GLfloat *d, int m)
    {
    
    	tetra(a,b,c,d);
    }
    
    
    void display()
    {
    	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glBegin(GL_TRIANGLES);
        divide_tetra(v[0], v[1], v[2], v[3], n);
        glEnd();
        glFlush();
    }
    
    
    void myReshape(int w, int h)
    {
        glViewport(0, 0, w, h);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        if (w <= h)
            glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h / (GLfloat) w,
                2.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
        else
            glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,
                2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, -10.0, 10.0);
        glMatrixMode(GL_MODELVIEW);
        glutPostRedisplay();
    }
    void init (void) 
    {
       glClearColor (0.0, 0.0, 0.0, 0.0);
       glShadeModel (GL_FLAT);    
    }
    
    
    void main(int argc, char **argv)
    {
    
        n=4; /* or enter number of subdivision steps here */
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
        glutInitWindowSize(800, 600);
        glutCreateWindow("3D TetraHedron");
    	init ();
        glutReshapeFunc(myReshape);
    	glutMouseFunc (mouse);
        glutDisplayFunc(display);
        glEnable(GL_DEPTH_TEST);
        glClearColor (1.0, 1.0, 1.0, 1.0);
        glutMainLoop();
    }
    Thanks
    Rogue

  2. #2
    Registered User rogue's Avatar
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    Oct 2005
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    9
    No replies?
    Surely someone knows whats going on?

  3. #3
    Sweet
    Join Date
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    Tucson, Arizona
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    1,807
    Maybe you would get better results on the game programming board. Also bumping threads is a little rude.
    Woop?

  4. #4
    Registered User rogue's Avatar
    Join Date
    Oct 2005
    Posts
    9
    Code:
    
    
    #include <stdlib.h>
    #include <GL/glut.h>
    
    /* initial tetrahedron */
    
    GLfloat v[4][3]={{0.0, 0.0, 1.0}, {0.0, 0.942809, -0.33333},
          {-0.816497, -0.471405, -0.333333}, {0.816497, -0.471405, -0.333333}};
    
    GLfloat colors[4][3] = {{1.0, 0.0, 0.0}, {0.0, 1.0, 0.0},
                            {0.0, 0.0, 1.0}, {0.0, 0.0, 0.0}};
    
    int n;
    
    	GLubyte fly[] = {								//fly stipple pattern
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x03, 0x80, 0x01, 0xC0, 0x06, 0xC0, 0x03, 0x60, 
          0x04, 0x60, 0x06, 0x20, 0x04, 0x30, 0x0C, 0x20, 
          0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,
          0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xC0, 0x22, 
          0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 
          0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
          0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 
          0x66, 0x01, 0x80, 0x66, 0x33, 0x01, 0x80, 0xCC, 
          0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30,
          0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0, 
          0x03, 0x31, 0x8c, 0xc0, 0x03, 0x33, 0xcc, 0xc0, 
          0x10, 0x63, 0xC6, 0x08, 0x10, 0x30, 0x0c, 0x08, 
          0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};
    
    
    void triangle(GLfloat *va, GLfloat *vb, GLfloat *vc)
    {
           glVertex3fv(va);
           glVertex3fv(vb);
           glVertex3fv(vc);
    }
    
    void tetra(GLfloat *a, GLfloat *b, GLfloat *c, GLfloat *d)
    {
    
    	glColor3fv(colors[0]);//sets color to red
        glEnable (GL_POLYGON_STIPPLE);//sets to enable polygon stipple
    	glPolygonStipple (fly);//sets the polygon stipple to fly[]
    
    	glBegin(GL_POLYGON);//starts the polygon draw, has to be polygon so polygon stipple will work
    
    	glVertex2fv(v[0]);
    	glVertex2fv(v[1]);
    	glVertex2fv(v[2]);
    
    	glEnd();//ends polygon
    	glDisable (GL_POLYGON_STIPPLE);//ends the stipple
    
    	glBegin(GL_TRIANGLES);//starts triangles
    
    	glColor3fv(colors[1]);
        triangle(a, c, d);
        glColor3fv(colors[2]);
        triangle(a, d, b);
        glColor3fv(colors[3]);
        triangle(b, d, c);
    
    	glEnd();
    	
    }
    
    void divide_tetra(GLfloat *a, GLfloat *b, GLfloat *c, GLfloat *d, int m)
    {
    
        //GLfloat mid[6][3];
        
        tetra(a,b,c,d); //calls the tetra draw function
    }
    
    void mouse(int btn, int state, int x, int y)//function that exits upon right mouse button in down state
    {
        if(btn==GLUT_RIGHT_BUTTON && state==GLUT_DOWN)   exit(0);
    }
    
    
    void display()
    {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        
        divide_tetra(v[0], v[1], v[2], v[3], n);
        
        glFlush();
    }
    
    
    void myReshape(int w, int h)
    {
        glViewport(0, 0, w, h);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        if (w <= h)
            glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h / (GLfloat) w,
                2.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
        else
            glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,
                2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, -10.0, 10.0);
        glMatrixMode(GL_MODELVIEW);
        glutPostRedisplay();
    }
    
    
    void main(int argc, char **argv)
    {
        n=4; /* or enter number of subdivision steps here */
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
        glutInitWindowSize(500, 500);
        glutCreateWindow("Attack of the fly Tetrahedron!!");
        glutReshapeFunc(myReshape);
    	glutMouseFunc (mouse);//This function calls mouse which closes upon clicking right mouse button
        glutDisplayFunc(display);
        glEnable(GL_DEPTH_TEST);
        glClearColor (1.0, 1.0, 1.0, 1.0);
        glutMainLoop();
    }

  5. #5
    Registered User
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    You don't need to post the code twice. Bumping is frowned on. Please try posting in the gamedevelopment forum.

  6. #6
    Registered User Frobozz's Avatar
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    Same code alright - just some things in it are redone. Possibly for speed.

  7. #7
    Frequently Quite Prolix dwks's Avatar
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    main returns int.
    dwk

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