progs/tests/condrender.c

   1 /*
   2  * Test GL_NV_conditional_render
   3  *
   4  * Brian Paul
   5  * 30 Dec 2009
   6  *
   7  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #include <assert.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <math.h>
  32 #include <GL/glew.h>
  33 #include <GL/glut.h>
  34
  35 #define TEST_DISPLAY_LISTS 0
  36
  37 static GLboolean Anim = GL_TRUE;
  38 static GLfloat Xpos = 0;
  39 static GLuint OccQuery;
  40 static GLint Win = 0;
  41
  42
  43 static void Idle(void)
  44 {
  45    static int lastTime = 0;
  46    static int sign = +1;
  47    int time = glutGet(GLUT_ELAPSED_TIME);
  48    float step;
  49
  50    if (lastTime == 0)
  51       lastTime = time;
  52    else if (time - lastTime < 20)  /* 50Hz update */
  53       return;
  54
  55    step = (time - lastTime) / 1000.0 * sign;
  56    lastTime = time;
  57
  58    Xpos += step;
  59
  60    if (Xpos > 2.5) {
  61       Xpos = 2.5;
  62       sign = -1;
  63    }
  64    else if (Xpos < -2.5) {
  65       Xpos = -2.5;
  66       sign = +1;
  67    }
  68    glutPostRedisplay();
  69 }
  70
  71
  72 static void Display( void )
  73 {
  74    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  75
  76    glEnable(GL_DEPTH_TEST);
  77
  78    glMatrixMode( GL_PROJECTION );
  79    glLoadIdentity();
  80    glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
  81    glMatrixMode( GL_MODELVIEW );
  82    glLoadIdentity();
  83    glTranslatef( 0.0, 0.0, -15.0 );
  84
  85    /* draw the occluding polygons */
  86    glColor3f(0, 0.6, 0.8);
  87    glBegin(GL_QUADS);
  88    glVertex2f(-1.6, -1.5);
  89    glVertex2f(-0.4, -1.5);
  90    glVertex2f(-0.4,  1.5);
  91    glVertex2f(-1.6,  1.5);
  92
  93    glVertex2f( 0.4, -1.5);
  94    glVertex2f( 1.6, -1.5);
  95    glVertex2f( 1.6,  1.5);
  96    glVertex2f( 0.4,  1.5);
  97    glEnd();
  98
  99    /* draw the test polygon with occlusion testing */
 100    glPushMatrix();
 101    glTranslatef(Xpos, 0, -0.5);
 102    glScalef(0.3, 0.3, 1.0);
 103    glRotatef(-90.0 * Xpos, 0, 0, 1);
 104
 105 #if TEST_DISPLAY_LISTS
 106    glNewList(10, GL_COMPILE);
 107    glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery);
 108    glEndList();
 109    glCallList(10);
 110 #else
 111    glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery);
 112 #endif
 113
 114    glColorMask(0, 0, 0, 0);
 115    glDepthMask(GL_FALSE);
 116
 117    glBegin(GL_POLYGON);
 118    glVertex3f(-1, -1, 0);
 119    glVertex3f( 1, -1, 0);
 120    glVertex3f( 1,  1, 0);
 121    glVertex3f(-1,  1, 0);
 122    glEnd();
 123
 124 #if TEST_DISPLAY_LISTS
 125    glNewList(11, GL_COMPILE);
 126    glEndQueryARB(GL_SAMPLES_PASSED_ARB);
 127    glEndList();
 128    glCallList(11);
 129 #else
 130    glEndQueryARB(GL_SAMPLES_PASSED_ARB);
 131 #endif
 132
 133    glColorMask(1, 1, 1, 1);
 134    glDepthMask(GL_TRUE);
 135
 136    /* Note: disable depth test here so that we'll always see the orange
 137     * box, except when it's totally culled.
 138     */
 139    glDisable(GL_DEPTH_TEST);
 140
 141    glBeginConditionalRenderNV(OccQuery, GL_QUERY_WAIT_NV);
 142       /* draw the orange rect, so we can see what's going on */
 143       glColor3f(0.8, 0.5, 0);
 144       glBegin(GL_POLYGON);
 145          glVertex3f(-1, -1, 0);
 146          glVertex3f( 1, -1, 0);
 147          glVertex3f( 1,  1, 0);
 148          glVertex3f(-1,  1, 0);
 149       glEnd();
 150    glEndConditionalRenderNV();
 151
 152    /* always draw white outline around orange box */
 153    glColor3f(1.0, 1.0, 1.0);
 154    glBegin(GL_LINE_LOOP);
 155       glVertex3f(-1, -1, 0);
 156       glVertex3f( 1, -1, 0);
 157       glVertex3f( 1,  1, 0);
 158        glVertex3f(-1,  1, 0);
 159    glEnd();
 160
 161    glPopMatrix();
 162
 163    glutSwapBuffers();
 164 }
 165
 166
 167 static void Reshape( int width, int height )
 168 {
 169    glViewport( 0, 0, width, height );
 170 }
 171
 172
 173 static void Key( unsigned char key, int x, int y )
 174 {
 175    (void) x;
 176    (void) y;
 177    switch (key) {
 178    case 27:
 179       glDeleteQueriesARB(1, &OccQuery);
 180       glutDestroyWindow(Win);
 181       exit(0);
 182       break;
 183    case ' ':
 184       Anim = !Anim;
 185       if (Anim)
 186          glutIdleFunc(Idle);
 187       else
 188          glutIdleFunc(NULL);
 189       break;
 190    }
 191    glutPostRedisplay();
 192 }
 193
 194
 195 static void SpecialKey( int key, int x, int y )
 196 {
 197    const GLfloat step = 0.1;
 198    (void) x;
 199    (void) y;
 200    switch (key) {
 201    case GLUT_KEY_LEFT:
 202       Xpos -= step;
 203       break;
 204    case GLUT_KEY_RIGHT:
 205       Xpos += step;
 206       break;
 207    }
 208    glutPostRedisplay();
 209 }
 210
 211
 212 static void Init( void )
 213 {
 214    if (!glutExtensionSupported("GL_ARB_occlusion_query") ||
 215        !glutExtensionSupported("GL_NV_conditional_render")) {
 216       printf("Sorry, this demo requires the extensions:\n");
 217       printf("  GL_ARB_occlusion_query\n");
 218       printf("  GL_NV_conditional_render\n");
 219       exit(-1);
 220    }
 221
 222    glGenQueriesARB(1, &OccQuery);
 223    assert(OccQuery > 0);
 224 }
 225
 226
 227 int main( int argc, char *argv[] )
 228 {
 229    glutInitWindowSize( 400, 400 );
 230    glutInit( &argc, argv );
 231    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
 232    Win = glutCreateWindow(argv[0]);
 233    glewInit();
 234    glutReshapeFunc( Reshape );
 235    glutKeyboardFunc( Key );
 236    glutSpecialFunc( SpecialKey );
 237    glutIdleFunc( Idle );
 238    glutDisplayFunc( Display );
 239    Init();
 240    glutMainLoop();
 241    return 0;
 242 }