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-rw-r--r-- | progs/tests/Makefile | 1 | ||||
-rw-r--r-- | progs/tests/stencil_wrap.c | 257 |
2 files changed, 258 insertions, 0 deletions
diff --git a/progs/tests/Makefile b/progs/tests/Makefile index 872fa0f621..1a294014aa 100644 --- a/progs/tests/Makefile +++ b/progs/tests/Makefile @@ -38,6 +38,7 @@ SOURCES = antialias.c \ seccolor.c \ sharedtex.c \ stencilwrap.c \ + stencil_wrap.c \ tex1d.c \ texline.c \ texrect.c \ diff --git a/progs/tests/stencil_wrap.c b/progs/tests/stencil_wrap.c new file mode 100644 index 0000000000..88cf3809ca --- /dev/null +++ b/progs/tests/stencil_wrap.c @@ -0,0 +1,257 @@ +/* + * (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/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" ); + glutReshapeFunc( Reshape ); + glutKeyboardFunc( Key ); + glutDisplayFunc( Display ); + Init(); + glutMainLoop(); + return 0; +} |