| /* |
| * Test GL_NV_conditional_render |
| * |
| * Brian Paul |
| * 30 Dec 2009 |
| * |
| * Copyright (C) 2009 VMware, Inc. 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 |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS 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. |
| */ |
| |
| #include <assert.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <math.h> |
| #include <GL/glew.h> |
| #include <GL/glut.h> |
| |
| #define TEST_DISPLAY_LISTS 0 |
| |
| static GLboolean Anim = GL_TRUE; |
| static GLfloat Xpos = 0; |
| static GLuint OccQuery; |
| static GLint Win = 0; |
| |
| |
| static void Idle(void) |
| { |
| static int lastTime = 0; |
| static int sign = +1; |
| int time = glutGet(GLUT_ELAPSED_TIME); |
| float step; |
| |
| if (lastTime == 0) |
| lastTime = time; |
| else if (time - lastTime < 20) /* 50Hz update */ |
| return; |
| |
| step = (time - lastTime) / 1000.0 * sign; |
| lastTime = time; |
| |
| Xpos += step; |
| |
| if (Xpos > 2.5) { |
| Xpos = 2.5; |
| sign = -1; |
| } |
| else if (Xpos < -2.5) { |
| Xpos = -2.5; |
| sign = +1; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void Display( void ) |
| { |
| glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); |
| |
| glEnable(GL_DEPTH_TEST); |
| |
| glMatrixMode( GL_PROJECTION ); |
| glLoadIdentity(); |
| glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 ); |
| glMatrixMode( GL_MODELVIEW ); |
| glLoadIdentity(); |
| glTranslatef( 0.0, 0.0, -15.0 ); |
| |
| /* draw the occluding polygons */ |
| glColor3f(0, 0.6, 0.8); |
| glBegin(GL_QUADS); |
| glVertex2f(-1.6, -1.5); |
| glVertex2f(-0.4, -1.5); |
| glVertex2f(-0.4, 1.5); |
| glVertex2f(-1.6, 1.5); |
| |
| glVertex2f( 0.4, -1.5); |
| glVertex2f( 1.6, -1.5); |
| glVertex2f( 1.6, 1.5); |
| glVertex2f( 0.4, 1.5); |
| glEnd(); |
| |
| /* draw the test polygon with occlusion testing */ |
| glPushMatrix(); |
| glTranslatef(Xpos, 0, -0.5); |
| glScalef(0.3, 0.3, 1.0); |
| glRotatef(-90.0 * Xpos, 0, 0, 1); |
| |
| #if TEST_DISPLAY_LISTS |
| glNewList(10, GL_COMPILE); |
| glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery); |
| glEndList(); |
| glCallList(10); |
| #else |
| glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery); |
| #endif |
| |
| glColorMask(0, 0, 0, 0); |
| glDepthMask(GL_FALSE); |
| |
| glBegin(GL_POLYGON); |
| glVertex3f(-1, -1, 0); |
| glVertex3f( 1, -1, 0); |
| glVertex3f( 1, 1, 0); |
| glVertex3f(-1, 1, 0); |
| glEnd(); |
| |
| #if TEST_DISPLAY_LISTS |
| glNewList(11, GL_COMPILE); |
| glEndQueryARB(GL_SAMPLES_PASSED_ARB); |
| glEndList(); |
| glCallList(11); |
| #else |
| glEndQueryARB(GL_SAMPLES_PASSED_ARB); |
| #endif |
| |
| glColorMask(1, 1, 1, 1); |
| glDepthMask(GL_TRUE); |
| |
| /* Note: disable depth test here so that we'll always see the orange |
| * box, except when it's totally culled. |
| */ |
| glDisable(GL_DEPTH_TEST); |
| |
| glBeginConditionalRenderNV(OccQuery, GL_QUERY_WAIT_NV); |
| /* draw the orange rect, so we can see what's going on */ |
| glColor3f(0.8, 0.5, 0); |
| glBegin(GL_POLYGON); |
| glVertex3f(-1, -1, 0); |
| glVertex3f( 1, -1, 0); |
| glVertex3f( 1, 1, 0); |
| glVertex3f(-1, 1, 0); |
| glEnd(); |
| glEndConditionalRenderNV(); |
| |
| /* always draw white outline around orange box */ |
| glColor3f(1.0, 1.0, 1.0); |
| glBegin(GL_LINE_LOOP); |
| glVertex3f(-1, -1, 0); |
| glVertex3f( 1, -1, 0); |
| glVertex3f( 1, 1, 0); |
| glVertex3f(-1, 1, 0); |
| glEnd(); |
| |
| glPopMatrix(); |
| |
| glutSwapBuffers(); |
| } |
| |
| |
| static void Reshape( int width, int height ) |
| { |
| glViewport( 0, 0, width, height ); |
| } |
| |
| |
| static void Key( unsigned char key, int x, int y ) |
| { |
| (void) x; |
| (void) y; |
| switch (key) { |
| case 27: |
| glDeleteQueriesARB(1, &OccQuery); |
| glutDestroyWindow(Win); |
| exit(0); |
| break; |
| case ' ': |
| Anim = !Anim; |
| if (Anim) |
| glutIdleFunc(Idle); |
| else |
| glutIdleFunc(NULL); |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void SpecialKey( int key, int x, int y ) |
| { |
| const GLfloat step = 0.1; |
| (void) x; |
| (void) y; |
| switch (key) { |
| case GLUT_KEY_LEFT: |
| Xpos -= step; |
| break; |
| case GLUT_KEY_RIGHT: |
| Xpos += step; |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void Init( void ) |
| { |
| if (!glutExtensionSupported("GL_ARB_occlusion_query") || |
| !glutExtensionSupported("GL_NV_conditional_render")) { |
| printf("Sorry, this demo requires the extensions:\n"); |
| printf(" GL_ARB_occlusion_query\n"); |
| printf(" GL_NV_conditional_render\n"); |
| exit(-1); |
| } |
| |
| glGenQueriesARB(1, &OccQuery); |
| assert(OccQuery > 0); |
| } |
| |
| |
| int main( int argc, char *argv[] ) |
| { |
| glutInitWindowSize( 400, 400 ); |
| glutInit( &argc, argv ); |
| glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ); |
| Win = glutCreateWindow(argv[0]); |
| glewInit(); |
| glutReshapeFunc( Reshape ); |
| glutKeyboardFunc( Key ); |
| glutSpecialFunc( SpecialKey ); |
| glutIdleFunc( Idle ); |
| glutDisplayFunc( Display ); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |