progs/trivial/tri-query.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <GL/glew.h>
  29 #include <GL/glut.h>
  30
  31
  32
  33 #define CI_OFFSET_1 16
  34 #define CI_OFFSET_2 32
  35
  36 static GLuint OccQuery;
  37
  38 GLenum doubleBuffer;
  39
  40 static void Init(void)
  41 {
  42    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  43    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  44    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  45    fflush(stderr);
  46
  47     glClearColor(0.0, 0.0, 1.0, 0.0);
  48
  49    glGenQueriesARB(1, &OccQuery);
  50 }
  51
  52 static void Reshape(int width, int height)
  53 {
  54
  55     glViewport(0, 0, (GLint)width, (GLint)height);
  56
  57     glMatrixMode(GL_PROJECTION);
  58     glLoadIdentity();
  59     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  60     glMatrixMode(GL_MODELVIEW);
  61 }
  62
  63 static void Key(unsigned char key, int x, int y)
  64 {
  65
  66     switch (key) {
  67       case 27:
  68         exit(1);
  69       default:
  70         return;
  71     }
  72
  73     glutPostRedisplay();
  74 }
  75
  76 static void Draw(void)
  77 {
  78    GLuint passed;
  79    GLint ready;
  80
  81    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  82
  83    glEnable(GL_DEPTH_TEST);
  84
  85    glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery);
  86
  87    glBegin(GL_TRIANGLES);
  88    glColor3f(0,0,.7);
  89    glVertex3f( 0.9, -0.9, -30.0);
  90    glColor3f(.8,0,0);
  91    glVertex3f( 0.9,  0.9, -30.0);
  92    glColor3f(0,.9,0);
  93    glVertex3f(-0.9,  0.0, -30.0);
  94    glEnd();
  95
  96    glEndQueryARB(GL_SAMPLES_PASSED_ARB);
  97
  98    do {
  99       /* do useful work here, if any */
 100       glGetQueryObjectivARB(OccQuery, GL_QUERY_RESULT_AVAILABLE_ARB, &ready);
 101    } while (!ready);
 102    glGetQueryObjectuivARB(OccQuery, GL_QUERY_RESULT_ARB, &passed);
 103
 104    fprintf(stderr, " %d Fragments Visible\n", passed);
 105
 106    glFlush();
 107
 108    if (doubleBuffer) {
 109       glutSwapBuffers();
 110    }
 111 }
 112
 113 static GLenum Args(int argc, char **argv)
 114 {
 115     GLint i;
 116
 117     doubleBuffer = GL_FALSE;
 118
 119     for (i = 1; i < argc; i++) {
 120         if (strcmp(argv[i], "-sb") == 0) {
 121             doubleBuffer = GL_FALSE;
 122         } else if (strcmp(argv[i], "-db") == 0) {
 123             doubleBuffer = GL_TRUE;
 124         } else {
 125             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 126             return GL_FALSE;
 127         }
 128     }
 129     return GL_TRUE;
 130 }
 131
 132 int main(int argc, char **argv)
 133 {
 134     GLenum type;
 135
 136     glutInit(&argc, argv);
 137
 138     if (Args(argc, argv) == GL_FALSE) {
 139         exit(1);
 140     }
 141
 142     glutInitWindowPosition(100, 0); glutInitWindowSize( 250, 250);
 143
 144     type = GLUT_RGB | GLUT_DEPTH;
 145     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 146     glutInitDisplayMode(type);
 147
 148     if (glutCreateWindow(*argv) == GL_FALSE) {
 149         exit(1);
 150     }
 151
 152     glewInit();
 153
 154     Init();
 155
 156     glutReshapeFunc(Reshape);
 157     glutKeyboardFunc(Key);
 158     glutDisplayFunc(Draw);
 159     glutMainLoop();
 160         return 0;
 161 }