progs/tests/stencil_twoside.c

   1 /*
   2  * (C) Copyright IBM Corporation 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
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   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
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  24
  25 /**
  26  * \file stencil_twoside.c
  27  *
  28  * Simple test of GL_ATI_separate_stencil (or the OGL 2.0 equivalent) functionality.
  29  * Five squares (or six if stencil wrap is available) are drawn
  30  * with different stencil modes, but all should be rendered with the same
  31  * final color.
  32  */
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <GL/glew.h>
  37 #include <GL/glut.h>
  38
  39 static int use20syntax = 1;
  40 static int Width = 650;
  41 static int Height = 200;
  42 static const GLfloat Near = 5.0, Far = 25.0;
  43
  44
  45 static PFNGLSTENCILFUNCSEPARATEPROC stencil_func_separate = NULL;
  46 static PFNGLSTENCILFUNCSEPARATEATIPROC stencil_func_separate_ati = NULL;
  47 static PFNGLSTENCILOPSEPARATEPROC stencil_op_separate = NULL;
  48
  49 static void Display( void )
  50 {
  51    GLint  max_stencil;
  52    GLint  stencil_bits;
  53    unsigned i;
  54
  55
  56    glGetIntegerv( GL_STENCIL_BITS, & stencil_bits );
  57    max_stencil = (1U << stencil_bits) - 1;
  58    printf( "Stencil bits = %u, maximum stencil value = 0x%08x\n",
  59            stencil_bits, max_stencil );
  60
  61    glClearStencil( 1 );
  62    glClearColor( 0.2, 0.2, 0.8, 0 );
  63    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT
  64             | GL_STENCIL_BUFFER_BIT );
  65
  66
  67    glPushMatrix();
  68
  69    /* This is the "reference" square.
  70     */
  71
  72    glDisable(GL_STENCIL_TEST);
  73    glTranslatef(-7.0, 0, 0);
  74    glBegin(GL_QUADS);
  75    glColor3f( 0.5, 0.5, 0.5 );
  76    glVertex2f(-1, -1);
  77    glVertex2f( 1, -1);
  78    glVertex2f( 1,  1);
  79    glVertex2f(-1,  1);
  80    glEnd();
  81
  82
  83    glEnable(GL_STENCIL_TEST);
  84
  85    /* Draw the first two squares using incr for the affected face
  86     */
  87
  88    /*************************************************************************
  89     * 2nd square
  90     */
  91    if (use20syntax) {
  92       stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
  93       stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
  94    }
  95    else {
  96       stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
  97    }
  98    stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR);
  99    stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR);
 100
 101    glTranslatef(3.0, 0, 0);
 102    glBegin(GL_QUADS);
 103    glColor3f( 0.9, 0.9, 0.9 );
 104    for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
 105       /* this should be front facing */
 106       glVertex2f(-1, -1);
 107       glVertex2f( 1, -1);
 108       glVertex2f( 1,  1);
 109       glVertex2f(-1,  1);
 110    }
 111    glEnd();
 112
 113    /* stencil vals should be equal to max_stencil */
 114    glStencilFunc(GL_EQUAL, max_stencil, ~0);
 115    glBegin(GL_QUADS);
 116    glColor3f( 0.5, 0.5, 0.5 );
 117    glVertex2f(-1, -1);
 118    glVertex2f( 1, -1);
 119    glVertex2f( 1,  1);
 120    glVertex2f(-1,  1);
 121    glEnd();
 122
 123    /*************************************************************************
 124     * 3rd square
 125     */
 126    if (use20syntax) {
 127       stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
 128       stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
 129    }
 130    else {
 131       stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
 132    }
 133    stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
 134    stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
 135
 136    glTranslatef(3.0, 0, 0);
 137    glBegin(GL_QUADS);
 138    glColor3f( 0.9, 0.9, 0.9 );
 139    for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
 140       /* this should be back facing */
 141       glVertex2f(-1, -1);
 142       glVertex2f(-1,  1);
 143       glVertex2f( 1,  1);
 144       glVertex2f( 1, -1);
 145    }
 146    glEnd();
 147
 148    /* stencil vals should be equal to max_stencil */
 149    glStencilFunc(GL_EQUAL, max_stencil, ~0);
 150    glBegin(GL_QUADS);
 151    glColor3f( 0.5, 0.5, 0.5 );
 152    glVertex2f(-1, -1);
 153    glVertex2f( 1, -1);
 154    glVertex2f( 1,  1);
 155    glVertex2f(-1,  1);
 156    glEnd();
 157
 158    /*************************************************************************
 159     * 4th square
 160     */
 161    if (use20syntax) {
 162       stencil_func_separate(GL_FRONT, GL_NEVER, 0, ~0);
 163       stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
 164    }
 165    else {
 166       stencil_func_separate_ati(GL_NEVER, GL_ALWAYS, 0, ~0);
 167    }
 168    stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
 169    stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
 170
 171    glTranslatef(3.0, 0, 0);
 172    glBegin(GL_QUADS);
 173    glColor3f( 0.9, 0.9, 0.9 );
 174    for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
 175       /* this should be back facing */
 176       glVertex2f(-1, -1);
 177       glVertex2f(-1,  1);
 178       glVertex2f( 1,  1);
 179       glVertex2f( 1, -1);
 180       /* this should be front facing */
 181       glVertex2f(-1, -1);
 182       glVertex2f( 1, -1);
 183       glVertex2f( 1,  1);
 184       glVertex2f(-1,  1);
 185    }
 186    glEnd();
 187
 188    /* stencil vals should be equal to max_stencil */
 189    glStencilFunc(GL_EQUAL, max_stencil, ~0);
 190    glBegin(GL_QUADS);
 191    glColor3f( 0.5, 0.5, 0.5 );
 192    glVertex2f(-1, -1);
 193    glVertex2f( 1, -1);
 194    glVertex2f( 1,  1);
 195    glVertex2f(-1,  1);
 196    glEnd();
 197
 198    /*************************************************************************
 199     * 5th square
 200     */
 201    if (use20syntax) {
 202       stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
 203       stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
 204    }
 205    else {
 206       stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
 207    }
 208    stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR);
 209    stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR);
 210
 211    glTranslatef(3.0, 0, 0);
 212    glBegin(GL_QUADS);
 213    glColor3f( 0.9, 0.9, 0.9 );
 214    for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
 215       /* this should be back facing */
 216       glVertex2f(-1, -1);
 217       glVertex2f(-1,  1);
 218       glVertex2f( 1,  1);
 219       glVertex2f( 1, -1);
 220       /* this should be front facing */
 221       glVertex2f(-1, -1);
 222       glVertex2f( 1, -1);
 223       glVertex2f( 1,  1);
 224       glVertex2f(-1,  1);
 225    }
 226    glEnd();
 227
 228    glStencilFunc(GL_EQUAL, 1, ~0);
 229    glBegin(GL_QUADS);
 230    glColor3f( 0.5, 0.5, 0.5 );
 231    glVertex2f(-1, -1);
 232    glVertex2f( 1, -1);
 233    glVertex2f( 1,  1);
 234    glVertex2f(-1,  1);
 235    glEnd();
 236
 237    /*************************************************************************
 238     * 6th square
 239     */
 240    if (glutExtensionSupported("GL_EXT_stencil_wrap")) {
 241       if (use20syntax) {
 242          stencil_func_separate(GL_FRONT, GL_ALWAYS, 0, ~0);
 243          stencil_func_separate(GL_BACK, GL_ALWAYS, 0, ~0);
 244       }
 245       else {
 246          stencil_func_separate_ati(GL_ALWAYS, GL_ALWAYS, 0, ~0);
 247       }
 248       stencil_op_separate(GL_FRONT, GL_KEEP, GL_KEEP, GL_KEEP);
 249       stencil_op_separate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
 250
 251       glTranslatef(3.0, 0, 0);
 252       glBegin(GL_QUADS);
 253       glColor3f( 0.9, 0.9, 0.9 );
 254       for ( i = 0 ; i < (max_stencil + 5) ; i++ ) {
 255          /* this should be back facing */
 256          glVertex2f(-1, -1);
 257          glVertex2f(-1,  1);
 258          glVertex2f( 1,  1);
 259          glVertex2f( 1, -1);
 260          /* this should be front facing */
 261          glVertex2f(-1, -1);
 262          glVertex2f( 1, -1);
 263          glVertex2f( 1,  1);
 264          glVertex2f(-1,  1);
 265       }
 266       glEnd();
 267
 268       glStencilFunc(GL_EQUAL, 260 - 255, ~0);
 269       glBegin(GL_QUADS);
 270       glColor3f( 0.5, 0.5, 0.5 );
 271       glVertex2f(-1, -1);
 272       glVertex2f( 1, -1);
 273       glVertex2f( 1,  1);
 274       glVertex2f(-1,  1);
 275       glEnd();
 276    }
 277
 278    glPopMatrix();
 279
 280    glutSwapBuffers();
 281 }
 282
 283
 284 static void Reshape( int width, int height )
 285 {
 286    GLfloat ar = (float) width / (float) height;
 287    Width = width;
 288    Height = height;
 289    glViewport( 0, 0, width, height );
 290    glMatrixMode( GL_PROJECTION );
 291    glLoadIdentity();
 292    glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
 293    glMatrixMode( GL_MODELVIEW );
 294    glLoadIdentity();
 295    glTranslatef( 0.0, 0.0, -15.0 );
 296 }
 297
 298
 299 static void Key( unsigned char key, int x, int y )
 300 {
 301    (void) x;
 302    (void) y;
 303    switch (key) {
 304       case 27:
 305          exit(0);
 306          break;
 307    }
 308    glutPostRedisplay();
 309 }
 310
 311
 312 static void Init( void )
 313 {
 314    const char * const ver_string = (const char * const)
 315        glGetString( GL_VERSION );
 316
 317    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 318    printf("GL_VERSION = %s\n", ver_string);
 319
 320    if ( !glutExtensionSupported("GL_ATI_separate_stencil")
 321         && (atof( ver_string ) < 2.0) ) {
 322       printf("Sorry, this program requires either GL_ATI_separate_stencil or OpenGL 2.0.\n");
 323       exit(1);
 324    }
 325    if (atof( ver_string ) < 2.0) {
 326       use20syntax = 0;
 327    }
 328    stencil_func_separate = (PFNGLSTENCILFUNCSEPARATEPROC) glutGetProcAddress( "glStencilFuncSeparate" );
 329    stencil_func_separate_ati = (PFNGLSTENCILFUNCSEPARATEATIPROC) glutGetProcAddress( "glStencilFuncSeparateATI" );
 330    stencil_op_separate = (PFNGLSTENCILOPSEPARATEPROC) glutGetProcAddress( "glStencilOpSeparate" );
 331
 332    printf("\nAll 5 (or 6) squares should be the same color.\n");
 333 }
 334
 335
 336 int main( int argc, char *argv[] )
 337 {
 338    glutInit( &argc, argv );
 339    glutInitWindowPosition( 0, 0 );
 340    glutInitWindowSize( Width, Height );
 341    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_STENCIL );
 342    glutCreateWindow( "GL_ATI_separate_stencil test" );
 343    glewInit();
 344    glutReshapeFunc( Reshape );
 345    glutKeyboardFunc( Key );
 346    glutDisplayFunc( Display );
 347    Init();
 348    glutMainLoop();
 349    return 0;
 350 }