condrender.c revision 32001f49 
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 "glut_wrap.h"
34
35#define TEST_DISPLAY_LISTS 0
36
37static GLboolean Anim = GL_TRUE;
38static GLfloat Xpos = 0;
39static GLuint OccQuery;
40static GLint Win = 0;
41
42
43static 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
72static 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
167static void Reshape( int width, int height )
168{
169   glViewport( 0, 0, width, height );
170}
171
172
173static 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
195static 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
212static 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
227int 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}
243