Opengl 贴图例子

#include <math.h> #include <windows.h> #include <GL/glut.h> #define PI 3.1416 GLuint texture[4]; GLfloat xRot = 0.0f; GLfloat yRot = 0.0f; GLfloat zRot = 0.0f; bool LoadTexture(LPTSTR szFileName, GLuint *texid) // Creates Texture From A Bitmap File { HBITMAP hBMP; // Handle Of The Bitmap BITMAP BMP; // Bitmap Structure glGenTextures(1, texid); // Create The Texture hBMP=(HBITMAP)LoadImage(GetModuleHandle(NULL), szFileName, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE ); if (!hBMP) // Does The Bitmap Exist? return FALSE; // If Not Return False GetObject(hBMP, sizeof(BMP), &BMP); // Get The Object // hBMP: Handle To Graphics Object // sizeof(BMP): Size Of Buffer For Object Information // &BMP: Buffer For Object Information glPixelStorei(GL_UNPACK_ALIGNMENT, 4); // Pixel Storage Mode (Word Alignment / 4 Bytes) // Typical Texture Generation Using Data From The Bitmap glBindTexture(GL_TEXTURE_2D, *texid); // Bind To The Texture ID glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); // Linear Min Filter glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); // Linear Mag Filter glTexImage2D(GL_TEXTURE_2D, 0, 3, BMP.bmWidth, BMP.bmHeight, 0, GL_BGR_EXT, GL_UNSIGNED_BYTE, BMP.bmBits); DeleteObject(hBMP); // Delete The Object return TRUE; // Loading Was Successful } void renderScene(void) { glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef( 0.0, 0.0, -5.0 ); glRotatef( xRot, 1.0, 0.0, 0.0 ); glRotatef( yRot, 0.0, 1.0, 0.0 ); glRotatef( zRot, 0.0, 0.0, 1.0 ); glBindTexture( GL_TEXTURE_2D, texture[0] ); //使用texture[0]纹理 glBegin( GL_QUADS ); //一面一面的画出立方体 glTexCoord2f( 0.0, 0.0 ); glVertex3f( -1.0, -1.0, 1.0 ); //定位纹理坐标和实体坐标 glTexCoord2f( 1.0, 0.0 ); glVertex3f( 1.0, -1.0, 1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex3f( 1.0, 1.0, 1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex3f( -1.0, 1.0, 1.0 ); glTexCoord2f( 1.0, 0.0 ); glVertex3f( -1.0, -1.0, -1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex3f( -1.0, 1.0, -1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex3f( 1.0, 1.0, -1.0 ); glTexCoord2f( 0.0, 0.0 ); glVertex3f( 1.0, -1.0, -1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex3f( -1.0, 1.0, -1.0 ); glTexCoord2f( 0.0, 0.0 ); glVertex3f( -1.0, 1.0, 1.0 ); glTexCoord2f( 1.0, 0.0 ); glVertex3f( 1.0, 1.0, 1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex3f( 1.0, 1.0, -1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex3f( -1.0, -1.0, -1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex3f( 1.0, -1.0, -1.0 ); glTexCoord2f( 0.0, 0.0 ); glVertex3f( 1.0, -1.0, 1.0 ); glTexCoord2f( 1.0, 0.0 ); glVertex3f( -1.0, -1.0, 1.0 ); glTexCoord2f( 1.0, 0.0 ); glVertex3f( 1.0, -1.0, -1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex3f( 1.0, 1.0, -1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex3f( 1.0, 1.0, 1.0 ); glTexCoord2f( 0.0, 0.0 ); glVertex3f( 1.0, -1.0, 1.0 ); glTexCoord2f( 0.0, 0.0 ); glVertex3f( -1.0, -1.0, -1.0 ); glTexCoord2f( 1.0, 0.0 ); glVertex3f( -1.0, -1.0, 1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex3f( -1.0, 1.0, 1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex3f( -1.0, 1.0, -1.0 ); glEnd(); glutSwapBuffers(); //交换前后台缓存 glFlush(); } void init() { glClearColor (0.0, 0.0, 0.0, 0.0); //设背景色为黑 glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective(45, 1, 0.1, 100); LoadTexture( "Metal_Bronze.bmp", &texture[0]); //创建纹理 glEnable( GL_TEXTURE_2D ); //允许使用纹理 glShadeModel( GL_SMOOTH ); //Gouround着色 glClearColor( 0.0, 0.0, 0.0, 0.5 ); glClearDepth( 1.0 ); //用1清理深度缓存 glEnable( GL_DEPTH_TEST ); //开启深度测试 glDepthFunc( GL_LEQUAL ); //设置测试通过条件为<= glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ); //设置hint，使效果最佳 } void reshapeFunc( int width, int height) { glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective(45, width/height, 0.1, 100); glViewport( 0, 0, width, height); } void rotateCube() //旋转立方体 { xRot += 0.3; yRot += 0.2; zRot += 0.4; glutPostRedisplay(); } void main(int argc, char** argv) { glutInit(&argc,argv); glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(500,500); glutInitWindowPosition(0,0); glutCreateWindow("Grphics-Lab4"); glutDisplayFunc(renderScene); glutReshapeFunc(reshapeFunc); glutIdleFunc(rotateCube); init(); glutMainLoop(); }