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