三维重建_ByC++_OpenGL_切面重建三维图

/* * License Applicability. Except to the extent portions of this file are * made subject to an alternative license as permitted in the SGI Free * Software License B, Version 1.1 (the "License"), the contents of this * file are subject only to the provisions of the License. You may not use * this file except in compliance with the License. You may obtain a copy * of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 * Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: * * http://oss.sgi.com/projects/FreeB * * Note that, as provided in the License, the Software is distributed on an * "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS * DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND * CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A * PARTICULAR PURPOSE, AND NON-INFRINGEMENT. * * Original Code. The Original Code is: OpenGL Sample Implementation, * Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, * Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. * Copyright in any portions created by third parties is as indicated * elsewhere herein. All Rights Reserved. * * Additional Notice Provisions: The application programming interfaces * established by SGI in conjunction with the Original Code are The * OpenGL(R) Graphics System: A Specification (Version 1.2.1), released * April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version * 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X * Window System(R) (Version 1.3), released October 19, 1998. This software * was created using the OpenGL(R) version 1.2.1 Sample Implementation * published by SGI, but has not been independently verified as being * compliant with the OpenGL(R) version 1.2.1 Specification. * */ /* checker.c * This program texture maps a checkerboard image onto * two rectangles. * * If running this program on OpenGL 1.0, texture objects are * not used. */ #include "stdafx.h" #include <stdlib.h> #include <stdio.h> #include "gles.h" #include <math.h> #include <Winbase.h> static void display(void); static void reshape(int w,int h); static void init(void); static GLuint texName; /* Create checkerboard texture */ #define checkImageWidth 64 #define checkImageHeight 64 static GLubyte checkImage[checkImageHeight][checkImageWidth][4]; void makeCheckImage(void) { int i, j, c; for (i = 0; i < checkImageHeight; i++) { for (j = 0; j < checkImageWidth; j++) { c = ((((i&0x8)==0)^((j&0x8))==0))*255; checkImage[i][j][0] = (GLubyte) c; checkImage[i][j][1] = (GLubyte) c; checkImage[i][j][2] = (GLubyte) c; checkImage[i][j][3] = (GLubyte) 255; } } } static void init(void) { static const GLfloat v[] = { -2.0, -1.0, 0.0, -2.0, 1.0, 0.0, 0.0, -1.0, 0.0, 0.0, 1.0, 0.0, 1.0, -1.0, 0.0, 1.0, 1.0, 0.0, 2.41421f, -1.0, -1.41421f, 2.41421f, 1.0, -1.41421f, }; static const GLbyte t[] = { 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, }; glClearColor (0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); glEnable(GL_DEPTH_TEST); makeCheckImage(); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glGenTextures(1, &texName); glBindTexture(GL_TEXTURE_2D, texName); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth, checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage); glVertexPointer(3, GL_FLOAT, 0, v); glTexCoordPointer(2, GL_BYTE, 0, t); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); } void CheckerRender() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glColor4f(1.0,0.0,0.0,0.0); glEnable(GL_TEXTURE_2D); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); glBindTexture(GL_TEXTURE_2D, texName); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glDrawArrays(GL_TRIANGLE_STRIP, 4, 4); glFlush(); glDisable(GL_TEXTURE_2D); } static void reshape(int w,int h) { glViewport (0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode (GL_PROJECTION); glLoadIdentity(); glFrustumf(-1.5f, 1.5f, -1.5f,1.5f, 1.0f, 10.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -3.6f); } int CheckerDemo() { init (); reshape(WINDOW_WIDTH, WINDOW_HEIGHT); /* DWORD diff = 0; DWORD start = GetTickCount(); for(int demo_loop = 0; demo_loop<200;demo_loop++) {DWORD start_render = GetTickCount(); //Render Scene render(); DWORD end_render = GetTickCount(); diff += (end_render - start_render); //Swap Buffers eglSwapBuffers ( dpy, surface); _DEGLSwapBuffers(); } DWORD end = GetTickCount(); float fps = (float)(200.0*1000)/(float)(end - start); printf("start %d \n",start); printf("end %d \n",end); printf("fps %f \n",fps); printf("fps for only render %f \n",(200.0*1000)/(float)diff); */ return 1; } int CheckerDeinit() { return 1; }