opengl 贴图

#include "stdafx.h"/* * Copyright (c) 1993-1997, 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 * Unpublished-- rights reserved under the copyright laws of the * United States.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., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311. * * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. */ #include <GL/glut.h>#include <stdlib.h>#include <stdio.h>  static GLuint texName; uchar* pData;void init(void){   glClearColor (0.0, 0.0, 0.0, 0.0);   glEnable(GL_DEPTH_TEST);   glEnable(GL_TEXTURE_2D);   glShadeModel(GL_SMOOTH);    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);    glGenTextures(1, &texName);   glBindTexture(GL_TEXTURE_2D, texName);   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 4096, 4096, 0,                GL_RGBA, GL_UNSIGNED_BYTE, pData);   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);} void display(void){   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);   glPushMatrix ();   glBindTexture(GL_TEXTURE_2D, texName);   glBegin(GL_QUADS);   {     glTexCoord2f(0.0f, 0.0f); glVertex3f(0.0f,0.0f,0.0f);     glTexCoord2f(1.0f, 0.0f); glVertex3f(1.0f,0.0f,0.0f);     glTexCoord2f(1.0f, 1.0f); glVertex3f(1.0f,1.0f,0.0f);     glTexCoord2f(0.0f, 1.0f); glVertex3f(0.0f,1.0f,0.0f);   }   glEnd();   glPopMatrix ();   glFlush();} void reshape(int w, int h){   glViewport(0, 0, (GLsizei) w, (GLsizei) h);   glMatrixMode(GL_PROJECTION);       glLoadIdentity();                 gluOrtho2D(0, 1, 0, 1);   glMatrixMode(GL_MODELVIEW);        glLoadIdentity();} void processNormalKeys(unsigned char key,int x,int y) {   if(key==27)     exit(0); } int main(int argc, char** argv){   Mat m = imread("BG.jpg");   cvtColor(m, m, CV_BGR2RGBA);   pData = m.data;   glutInit(&argc, argv);   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);   glutInitWindowSize(512, 512);   glutInitWindowPosition(100, 100);   glutCreateWindow (argv[0]);   //glutIdleFunc( idle );   init ();   glutDisplayFunc(display);   glutReshapeFunc(reshape);   glutKeyboardFunc(processNormalKeys);   glutMainLoop();   return 0;}