WRAP.C
上传用户:tengyuc
上传日期:2007-08-14
资源大小:722k
文件大小:3k
- #include <GL/glut.h>
- #include <stdlib.h>
- #include <stdio.h>
- // 创建棋盘格子纹理图样
- #define checkImageWidth 64
- #define checkImageHeight 64
- static GLubyte checkImage[checkImageHeight][checkImageWidth][4];
- #ifdef GL_VERSION_1_1
- static GLuint texName;
- #endif
- 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;
- }
- }
- }
- void init(void)
- {
- glClearColor (0.0, 0.0, 0.0, 0.0);
- glShadeModel(GL_FLAT);
- glEnable(GL_DEPTH_TEST);
- makeCheckImage();
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexImage2D(GL_TEXTURE_2D, 0, 4, checkImageWidth, checkImageHeight,
- 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage);
- }
- void display(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glEnable(GL_TEXTURE_2D);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
- glBegin(GL_QUADS);
- glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
- glTexCoord2f(0.0, 3.0); glVertex3f(-2.0, 1.0, 0.0);
- glTexCoord2f(3.0, 3.0); glVertex3f(0.0, 1.0, 0.0);
- glTexCoord2f(3.0, 0.0); glVertex3f(0.0, -1.0, 0.0);
- glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0);
- glTexCoord2f(0.0, 3.0); glVertex3f(1.0, 1.0, 0.0);
- glTexCoord2f(3.0, 3.0); glVertex3f(2.41421, 1.0, -1.41421);
- glTexCoord2f(3.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421);
- glEnd();
- glFlush();
- glDisable(GL_TEXTURE_2D);
- }
- void reshape(int w, int h)
- {
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.0, 0.0, -3.6);
- }
- void keyboard (unsigned char key, int x, int y)
- {
- switch (key) {
- case 's':
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
- glutPostRedisplay();
- break;
- case 'S':
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glutPostRedisplay();
- break;
- case 't':
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
- glutPostRedisplay();
- break;
- case 'T':
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glutPostRedisplay();
- break;
- case 27:
- exit(0);
- break;
- default:
- break;
- }
- }
- int main(int argc, char** argv)
- {
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
- glutInitWindowSize(250, 250);
- glutInitWindowPosition(100, 100);
- glutCreateWindow(argv[0]);
- init();
- glutDisplayFunc(display);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(keyboard);
- glutMainLoop();
- return 0;
- }