260 lines
6.1 KiB
C
260 lines
6.1 KiB
C
/*
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* (C) Copyright IBM Corporation 2004
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file stencil_wrap.c
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*
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* Simple test of GL_EXT_stencil_wrap functionality. Four squares are drawn
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* with different stencil modes, but all should be rendered with the same
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* final color.
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*
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* \author Ian Romanick <idr@us.ibm.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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static int Width = 550;
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static int Height = 200;
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static const GLfloat Near = 5.0, Far = 25.0;
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static void Display( void )
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{
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GLint max_stencil;
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GLint stencil_bits;
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unsigned i;
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glGetIntegerv( GL_STENCIL_BITS, & stencil_bits );
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max_stencil = (1U << stencil_bits) - 1;
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printf( "Stencil bits = %u, maximum stencil value = 0x%08x\n",
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stencil_bits, max_stencil );
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glClearStencil( 0 );
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glClearColor( 0.2, 0.2, 0.8, 0 );
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT
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| GL_STENCIL_BUFFER_BIT );
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glPushMatrix();
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/* This is the "reference" square.
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*/
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glDisable(GL_STENCIL_TEST);
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glTranslatef(-6.0, 0, 0);
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glBegin(GL_QUADS);
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glColor3f( 0.5, 0.5, 0.5 );
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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glEnd();
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glEnable(GL_STENCIL_TEST);
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/* Draw the first two squares using the two non-wrap (i.e., saturate)
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* modes.
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*/
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glStencilFunc(GL_ALWAYS, 0, ~0);
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glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
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glTranslatef(3.0, 0, 0);
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glBegin(GL_QUADS);
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glColor3f( 0.9, 0.9, 0.9 );
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for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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}
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glEnd();
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glStencilFunc(GL_EQUAL, max_stencil, ~0);
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glBegin(GL_QUADS);
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glColor3f( 0.5, 0.5, 0.5 );
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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glEnd();
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glStencilFunc(GL_ALWAYS, 0, ~0);
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glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
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glTranslatef(3.0, 0, 0);
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glBegin(GL_QUADS);
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glColor3f( 0.9, 0.9, 0.9 );
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for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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}
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glEnd();
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glStencilFunc(GL_EQUAL, 0, ~0);
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glBegin(GL_QUADS);
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glColor3f( 0.5, 0.5, 0.5 );
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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glEnd();
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/* Draw the last two squares using the two wrap modes.
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*/
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glStencilFunc(GL_ALWAYS, 0, ~0);
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glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP);
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glTranslatef(3.0, 0, 0);
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glBegin(GL_QUADS);
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glColor3f( 0.9, 0.9, 0.9 );
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for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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}
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glEnd();
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glStencilFunc(GL_EQUAL, 4, ~0);
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glBegin(GL_QUADS);
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glColor3f( 0.5, 0.5, 0.5 );
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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glEnd();
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glStencilFunc(GL_ALWAYS, 0, ~0);
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glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP);
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glTranslatef(3.0, 0, 0);
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glBegin(GL_QUADS);
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glColor3f( 0.9, 0.9, 0.9 );
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for ( i = 0 ; i < 5 ; i++ ) {
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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}
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glEnd();
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glStencilFunc(GL_EQUAL, (max_stencil - 4), ~0);
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glBegin(GL_QUADS);
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glColor3f( 0.5, 0.5, 0.5 );
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glVertex2f(-1, -1);
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glVertex2f( 1, -1);
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glVertex2f( 1, 1);
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glVertex2f(-1, 1);
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glEnd();
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glPopMatrix();
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glutSwapBuffers();
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}
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static void Reshape( int width, int height )
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{
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GLfloat ar = (float) width / (float) height;
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Width = width;
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Height = height;
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -15.0 );
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}
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static void Key( unsigned char key, int x, int y )
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{
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(void) x;
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(void) y;
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switch (key) {
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void Init( void )
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{
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const char * const ver_string = (const char * const)
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glGetString( GL_VERSION );
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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printf("GL_VERSION = %s\n", ver_string);
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if ( !glutExtensionSupported("GL_EXT_stencil_wrap")
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&& (atof( ver_string ) < 1.4) ) {
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printf("Sorry, this program requires either GL_EXT_stencil_wrap or OpenGL 1.4.\n");
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exit(1);
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}
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printf("\nAll 5 squares should be the same color.\n");
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glEnable( GL_BLEND );
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}
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int main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowPosition( 0, 0 );
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glutInitWindowSize( Width, Height );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_STENCIL );
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glutCreateWindow( "GL_EXT_stencil_wrap test" );
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glewInit();
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutDisplayFunc( Display );
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Init();
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glutMainLoop();
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return 0;
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}
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