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+/*
+ * (C) Copyright IBM Corporation 2006
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 (including the next
+ * paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * IBM AND/OR THEIR SUPPLIERS 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.
+ */
+
+/**
+ * \file vao-01.c
+ *
+ * Simple test of APPLE_vertex_array_object functionality. This test creates
+ * a VAO, pushed it (via \c glPushClientAttrib), modifies the VAO, then pops
+ * it (via \c glPopClientAttrib). After popping, the state of the VAO is
+ * examined.
+ *
+ * According the the APPLE_vertex_array_object spec, the contents of the VAO
+ * should be restored to the values that they had when pushed.
+ *
+ * \author Ian Romanick <idr@us.ibm.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#ifdef __darwin__
+#include <GLUT/glut.h>
+
+typedef void (* PFNGLBINDVERTEXARRAYAPPLEPROC) (GLuint array);
+typedef void (* PFNGLDELETEVERTEXARRAYSAPPLEPROC) (GLsizei n, const GLuint *arrays);
+typedef void (* PFNGLGENVERTEXARRAYSAPPLEPROC) (GLsizei n, const GLuint *arrays);
+typedef GLboolean (* PFNGLISVERTEXARRAYAPPLEPROC) (GLuint array);
+
+#else
+#include <GL/glut.h>
+#endif
+
+static PFNGLBINDVERTEXARRAYAPPLEPROC bind_vertex_array = NULL;
+static PFNGLGENVERTEXARRAYSAPPLEPROC gen_vertex_arrays = NULL;
+static PFNGLDELETEVERTEXARRAYSAPPLEPROC delete_vertex_arrays = NULL;
+static PFNGLISVERTEXARRAYAPPLEPROC is_vertex_array = NULL;
+
+static int Width = 400;
+static int Height = 200;
+static const GLfloat Near = 5.0, Far = 25.0;
+
+
+static void Display( void )
+{
+}
+
+
+static void Idle( void )
+{
+}
+
+
+static void Visible( int vis )
+{
+ if ( vis == GLUT_VISIBLE ) {
+ glutIdleFunc( Idle );
+ }
+ else {
+ glutIdleFunc( NULL );
+ }
+}
+static void Reshape( int width, int height )
+{
+ GLfloat ar = (float) width / (float) height;
+ Width = width;
+ Height = height;
+ glViewport( 0, 0, width, height );
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+ const char * const ver_string = (const char * const)
+ glGetString( GL_VERSION );
+ GLuint obj;
+ int pass = 1;
+ void * ptr;
+
+
+ printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+ printf("GL_VERSION = %s\n\n", ver_string);
+
+ if ( !glutExtensionSupported("GL_APPLE_vertex_array_object") ) {
+ printf("Sorry, this program requires GL_APPLE_vertex_array_object\n");
+ exit(2);
+ }
+
+ bind_vertex_array = glutGetProcAddress( "glBindVertexArrayAPPLE" );
+ gen_vertex_arrays = glutGetProcAddress( "glGenVertexArraysAPPLE" );
+ delete_vertex_arrays = glutGetProcAddress( "glDeleteVertexArraysAPPLE" );
+ is_vertex_array = glutGetProcAddress( "glIsVertexArrayAPPLE" );
+
+
+ (*gen_vertex_arrays)( 1, & obj );
+ (*bind_vertex_array)( obj );
+ glVertexPointer( 4, GL_FLOAT, sizeof(GLfloat) * 4, (void *) 0xDEADBEEF);
+ glEnableClientState( GL_VERTEX_ARRAY );
+
+ glPushClientAttrib( GL_CLIENT_VERTEX_ARRAY_BIT );
+
+ glVertexPointer( 4, GL_FLOAT, sizeof(GLfloat) * 4, (void *) 0xBADDC0DE);
+ glDisableClientState( GL_VERTEX_ARRAY );
+
+ glPopClientAttrib();
+
+ if ( ! glIsEnabled( GL_VERTEX_ARRAY ) ) {
+ printf( "Array state is incorrectly disabled.\n" );
+ pass = 0;
+ }
+
+ glGetPointerv( GL_VERTEX_ARRAY_POINTER, & ptr );
+ if ( ptr != (void *) 0xDEADBEEF ) {
+ printf( "Array pointer is incorrectly set to 0x%p.\n", ptr );
+ pass = 0;
+ }
+
+ if ( ! pass ) {
+ printf( "FAIL!\n" );
+ exit(1);
+ }
+}
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( Width, Height );
+ glutInitDisplayMode( GLUT_RGB );
+ glutCreateWindow( "GL_APPLE_vertex_array_object demo" );
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutDisplayFunc( Display );
+ glutVisibilityFunc( Visible );
+
+ Init();
+
+ return 0;
+}