glMultiDrawElementsEXT 或 glMultiDrawElements 调用失败的原因

/* * Copyright (c) 1993-2003, Silicon Graphics, Inc. * All Rights Reserved * * Permission to use, copy, modify, and distribute this software for any * purpose and without fee is hereby granted, provided that the above * copyright notice appear in all copies and that both the copyright * notice and this permission notice appear in supporting documentation, * and that the name of Silicon Graphics, Inc. not be used in * advertising or publicity pertaining to distribution of the software * without specific, written prior permission. * * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" AND * WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, * OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF * PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD * PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN ADVISED OF * THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE * OR PERFORMANCE OF THIS SOFTWARE. * * US Government Users Restricted Rights * Use, duplication, or disclosure by the Government is subject to * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph * (c)(1)(ii) of the Rights in Technical Data and Computer Software * clause at DFARS 252.227-7013 and/or in similar or successor clauses * in the FAR or the DOD or NASA FAR Supplement. Unpublished - rights * reserved under the copyright laws of the United States. * * Contractor/manufacturer is: * Silicon Graphics, Inc. * 1500 Crittenden Lane * Mountain View, CA 94043 * United State of America * * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. */ /* * mvarray.c * This program demonstrates multiple vertex arrays, * specifically the OpenGL routine glMultiDrawElements(). */ #include <stdlib.h> #include <stdio.h> #include <GL/glew.h> // 包含最新的gl.h,glu.h库 #include <GL/glut.h> // 包含OpenGL实用库 #ifdef GL_VERSION_1_3 void setupPointer_mvarray(void) { static GLint vertices[] = {25, 25, 75, 75, 100, 125, 150, 75, 200, 175, 250, 150, 300, 125, 100, 200, 150, 250, 200, 225, 250, 300, 300, 250}; glEnableClientState (GL_VERTEX_ARRAY); glVertexPointer (2, GL_INT, 0, vertices); } void init_mvarray(void) { glClearColor (0.0, 0.0, 0.0, 0.0); glShadeModel (GL_SMOOTH); setupPointer_mvarray (); } void display_mvarray(void) { static GLubyte oneIndices[] = {0, 1, 2, 3, 4, 5, 6}; static GLubyte twoIndices[] = {1, 7, 8, 9, 10, 11}; static GLsizei count[] = {7, 6}; static GLvoid * indices[2] = {oneIndices, twoIndices}; glClear (GL_COLOR_BUFFER_BIT); glColor3f (1.0, 1.0, 1.0); glMultiDrawElementsEXT (GL_LINE_STRIP, count, GL_UNSIGNED_BYTE, indices, 2); glFlush (); } void reshape_mvarray (int w, int h) { glViewport (0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h); } void keyboard_mvarray(unsigned char key, int x, int y) { switch (key) { case 27: exit(0); break; } } int g_main_mvarray(int argc, char** argv) { GLenum err; glutInit(&argc, argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); glutInitWindowSize (350, 350); glutInitWindowPosition (100, 100); glutCreateWindow (argv[0]); err = glewInit() ; if (GLEW_OK != err) { return 0; } init_mvarray (); glutDisplayFunc(display_mvarray); glutReshapeFunc(reshape_mvarray); glutKeyboardFunc (keyboard_mvarray); glutMainLoop(); return 0; } #else int main(int argc, char** argv) { fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0./n"); fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,/n"); fprintf (stderr, "you may be able to modify this program to make it run./n"); return 0; } #endif

 

 

关键是在 glutCreateWindow (argv[0]); 语句的后面添加glewInit();

如此 glMultiDrawElementsEXT (GL_LINE_STRIP, count, GL_UNSIGNED_BYTE,
                           indices, 2);

才会调用成功!