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 * Unpublished-- rights reserved under the copyright laws of the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;
}