1 /**********************************************************************  2       3   Texture mapping with OpenGL  4   5   June, 13th, 2000  6   7   This tutorial was written by Philipp Crocoll  8   Contact:   9     philipp.crocoll@web.de 10     www.codecolony.de 11  12   Every comment would be appreciated. 13  14   If you want to use parts of any code of mine: 15     let me know and 16     use it! 17  18 *********************************************************************** 19 ESC: exit 20  21 CAMERA movement: 22 w : forwards 23 s : backwards 24 a : turn left 25 d : turn right 26 x : turn up 27 y : turn down 28 v : strafe right 29 c : strafe left 30 r : move up 31 f : move down 32 b : switch between BfC and drawing the frontfaces wired 33 ***********************************************************************/ 34  35 #pragma comment ( lib , "glaux.lib" ) 36  37 #include <gl\glut.h> 38 #include <gl\glaux.h>        //Used for loading the textures 39 #include <windows.h> 40 #include "camera.h" 41 #include "textures.h" 42  43  44 CCamera Camera; 45  46 GLfloat YRotated = 0.0; 47  48 COGLTexture Tex1, Tex2; 49  50 void InitTextures(void) 51 { 52     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); 53     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); 54  55     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 56     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST); 57  58     Tex1.LoadFromFile("tex1.bmp"); 59     Tex2.LoadFromFile("tex2.bmp"); 60  61     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); 62  63 } 64  65 void DrawCube(void) 66 { 67     //Draws a cube with two shaded, two one-colored and two textured faces 68     glBegin(GL_QUADS); 69         glColor3f(1.0,0.0,0.0); 70       //front: 71         glVertex3f(-0.5,-0.5,0.5); 72         glVertex3f(-0.5,0.5,0.5); 73         glVertex3f(0.5,0.5,0.5); 74         glVertex3f(0.5,-0.5,0.5); 75  76       //back: 77         glColor3f(0.0,0.0,1.0); 78         glVertex3f(-0.5,-0.5,-0.5); 79         glVertex3f(0.5,-0.5,-0.5); 80         glVertex3f(0.5,0.5,-0.5); 81         glVertex3f(-0.5,0.5,-0.5); 82  83       //top: 84         glColor3f(0.0,0.6,1.0); 85         glVertex3f(-0.5,0.5,-0.5); 86         glVertex3f(0.5,0.5,-0.5    ); 87         glColor3f(1.0,0.6,1.0); 88         glVertex3f(0.5,0.5,0.5); 89         glVertex3f(-0.5,0.5,0.5); 90  91       //bottom: 92         glColor3f(0.0,0.6,0.0); 93         glVertex3f(-0.5,-0.5,-0.5); 94         glColor3f(0.6,0.6,0.6); 95         glVertex3f(-0.5,-0.5,0.5); 96         glColor3f(1.0,1.0,0.3); 97         glVertex3f(0.5,-0.5,0.5); 98         glColor3f(0.0,1.0,0.0); 99         glVertex3f(0.5,-0.5,-0.5);100     glEnd();101     glEnable(GL_TEXTURE_2D);102 103     Tex1.SetActive();104     glBegin(GL_QUADS);105       //left:106         glTexCoord2f(1.0,0.0);107         glVertex3f(-0.5,-0.5,-0.5);108         glTexCoord2f(1.0,1.0);109         glVertex3f(-0.5,0.5,-0.5);110         glTexCoord2f(0.0,1.0);111         glVertex3f(-0.5,0.5,0.5);112         glTexCoord2f(0.0,0.0);113         glVertex3f(-0.5,-0.5,0.5);114     glEnd();115       //right:116     Tex2.SetActive();117     glBegin(GL_QUADS);118         glTexCoord2f(0.0,0.0);119         glVertex3f(0.5,-0.5,-0.5);120         glTexCoord2f(1.0,0.0);121         glVertex3f(0.5,-0.5,0.5);122         glTexCoord2f(1.0,1.0);123         glVertex3f(0.5,0.5,0.5);124         glTexCoord2f(0.0,1.0);125         glVertex3f(0.5,0.5,-0.5);126     glEnd();127     glDisable(GL_TEXTURE_2D);128 129 130 }131 132 void reshape(int x, int y)133 {134     if (y == 0 || x == 0) return; 135     136     glMatrixMode(GL_PROJECTION);  137     glLoadIdentity();138     gluPerspective(40.0,(GLdouble)x/(GLdouble)y,0.5,20.0);139 140     glMatrixMode(GL_MODELVIEW);141     glViewport(0,0,x,y);142 }143 144 void Display(void)145 {146     glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);147     glLoadIdentity();148     Camera.Render();149     glRotatef(YRotated,0.0,1.0,0.0);        150     DrawCube();151 152     glFlush();  153     glutSwapBuffers();154 155 }156 void KeyDown(unsigned char key, int x, int y)157 {158     switch (key) 159     {160     case 27:        //ESC161         PostQuitMessage(0);162         break;163     case ‘a‘:        164         Camera.RotateY(5.0);165         Display();166         break;167     case ‘d‘:        168         Camera.RotateY(-5.0);169         Display();170         break;171     case ‘w‘:        172         Camera.MoveForwards( -0.1 ) ;173         Display();174         break;175     case ‘s‘:        176         Camera.MoveForwards( 0.1 ) ;177         Display();178         break;179     case ‘x‘:        180         Camera.RotateX(5.0);181         Display();182         break;183     case ‘y‘:        184         Camera.RotateX(-5.0);185         Display();186         break;187     case ‘c‘:        188         Camera.StrafeRight(-0.1);189         Display();190         break;191     case ‘v‘:        192         Camera.StrafeRight(0.1);193         Display();194         break;195     case ‘r‘:196         Camera.Move(F3dVector(0.0,0.1,0.0));197         Display();198         break;199     case ‘f‘:200         Camera.Move(F3dVector(0.0,-0.1,0.0));201         Display();202         break;203     case ‘b‘: 204         if (glIsEnabled(GL_CULL_FACE) == GL_TRUE)205         {206             glDisable(GL_CULL_FACE);207             glPolygonMode(GL_FRONT, GL_LINE);208             glPolygonMode(GL_BACK, GL_FILL);209         }210         else211         {212             glEnable(GL_CULL_FACE);213             glPolygonMode(GL_FRONT, GL_FILL);214         }215         Display();216         break;217     }218 }219 220  221 static long long times = 0;222 void Idle(void)223 {224      times++; // 延迟225      if(times>500000)226          times =0;227      if(times% 500000== 0)228      {229         YRotated += 0.4;230         Display();231      }232 }233 234 int main(int argc, char **argv)235 {236     glutInit(&argc, argv);237     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);238     glutInitWindowSize(300,300);239     glutCreateWindow("Textures and BfC");240     glFrontFace(GL_CW);  //Clockwise is front in "DrawCube()" // 顺时针为 正面241     glCullFace(GL_BACK); // 剔除操作242     glEnable(GL_CULL_FACE); //   开启剔除操作效果243     glEnable(GL_DEPTH_TEST); // 开启深度测试244     Camera.Move( F3dVector(0.0, 0.0, 3.0 )); // 镜头后退3个单位245     Camera.MoveForwards( 1.0 );  // 镜头前移1个单位，（多余？）246     InitTextures();247     glutDisplayFunc(Display);248     glutReshapeFunc(reshape);249     glutKeyboardFunc(KeyDown);250     glutIdleFunc(Idle);251     glutMainLoop();252     return 0;             253 }

 1 #include "textures.h" 2 void COGLTexture::LoadFromFile(char *filename) 3 { 4     glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 5     glGenTextures(1,&ID);  6     glBindTexture( GL_TEXTURE_2D, ID); 7     Image = auxDIBImageLoadA( (const char*) filename ); 8     Width = Image->sizeX; 9     Height = Image->sizeY;10     gluBuild2DMipmaps(    GL_TEXTURE_2D, 11                         3, 12                         Image->sizeX,13                         Image->sizeY,14                         GL_RGB,15                         GL_UNSIGNED_BYTE,16                         Image->data);17     delete Image;18 }19 20 void COGLTexture::SetActive()21 {22     glBindTexture( GL_TEXTURE_2D, ID);23 }24 25 unsigned int COGLTexture::GetID()26 {27     return ID;28 }

 1 #include <GL\glaux.h> 2  3 class COGLTexture 4 { 5 public: 6     _AUX_RGBImageRec *Image; 7     unsigned int GetID(); 8     void LoadFromFile(char *filename); 9     void SetActive();10     int GetWidth();11     int GetHeight();12 private:13     int Width, Height;14     unsigned int ID;15 };