TSTENCIL.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
#include "glos.h" 
 
#include <stdio.h> 
#include <string.h> 
#include <math.h> 
#include <gl\glaux.h> 
 
static void Init(void ); 
static void CALLBACK Reshape(int width,int height); 
static void CALLBACK Draw(void ); 
 
 
 
static void Init(void) 
{ 
 
    glClearColor(0.0, 0.0, 0.0, 0.0); 
 
    glClearStencil(0); 
    glStencilMask(1); 
    glEnable(GL_STENCIL_TEST); 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    glViewport(0, 0, (GLint)width, (GLint)height); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    glOrtho(-5.0, 5.0, -5.0, 5.0, -5.0, 5.0); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Draw(void) 
{ 
 
    glClear(GL_COLOR_BUFFER_BIT|GL_STENCIL_BUFFER_BIT); 
 
    glStencilFunc(GL_ALWAYS, 1, 1); 
    glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE); 
 
    glColor3ub(200, 0, 0); 
    glBegin(GL_POLYGON);         
    glVertex3i(-4, -4, 0); 
    glVertex3i( 4, -4, 0); 
    glVertex3i( 0,  4, 0); 
    glEnd(); 
 
    glStencilFunc(GL_EQUAL, 1, 1); 
    glStencilOp(GL_INCR, GL_KEEP, GL_DECR); 
 
    glColor3ub(0, 200, 0); 
    glBegin(GL_POLYGON); 
    glVertex3i(3, 3, 0); 
    glVertex3i(-3, 3, 0); 
    glVertex3i(-3, -3, 0); 
    glVertex3i(3, -3, 0); 
    glEnd(); 
 
    glStencilFunc(GL_EQUAL, 1, 1); 
    glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); 
 
    glColor3ub(0, 0, 200); 
    glBegin(GL_POLYGON); 
    glVertex3i(3, 3, 0); 
    glVertex3i(-3, 3, 0); 
    glVertex3i(-3, -3, 0); 
    glVertex3i(3, -3, 0); 
    glEnd(); 
 
    glFlush(); 
} 
 
 
void main(int argc, char **argv) 
{ 
    GLenum type; 
 
 
    auxInitPosition(0, 0, 300, 300); 
 
    type = AUX_RGB | AUX_SINGLE | AUX_STENCIL; 
 
    auxInitDisplayMode(type); 
 
    if (auxInitWindow("Stencil Test") == GL_FALSE) { 
    auxQuit(); 
    } 
 
    Init(); 
 
    auxExposeFunc((AUXEXPOSEPROC)Reshape); 
    auxReshapeFunc((AUXRESHAPEPROC)Reshape); 
    auxMainLoop(Draw); 
}