MIPMAP.C
上传用户:tengyuc
上传日期:2007-08-14
资源大小:722k
文件大小:4k
- #include <GL/glut.h>
- #include <stdlib.h>
- GLubyte mipmapImage32[32][32][4];
- GLubyte mipmapImage16[16][16][4];
- GLubyte mipmapImage8[8][8][4];
- GLubyte mipmapImage4[4][4][4];
- GLubyte mipmapImage2[2][2][4];
- GLubyte mipmapImage1[1][1][4];
- #ifdef GL_VERSION_1_1
- static GLuint texName;
- #endif
- void makeImages(void)
- {
- int i, j;
-
- for (i = 0; i < 32; i++) {
- for (j = 0; j < 32; j++) {
- mipmapImage32[i][j][0] = 255;
- mipmapImage32[i][j][1] = 255;
- mipmapImage32[i][j][2] = 0;
- mipmapImage32[i][j][3] = 255;
- }
- }
- for (i = 0; i < 16; i++) {
- for (j = 0; j < 16; j++) {
- mipmapImage16[i][j][0] = 255;
- mipmapImage16[i][j][1] = 0;
- mipmapImage16[i][j][2] = 255;
- mipmapImage16[i][j][3] = 255;
- }
- }
- for (i = 0; i < 8; i++) {
- for (j = 0; j < 8; j++) {
- mipmapImage8[i][j][0] = 255;
- mipmapImage8[i][j][1] = 0;
- mipmapImage8[i][j][2] = 0;
- mipmapImage8[i][j][3] = 255;
- }
- }
- for (i = 0; i < 4; i++) {
- for (j = 0; j < 4; j++) {
- mipmapImage4[i][j][0] = 0;
- mipmapImage4[i][j][1] = 255;
- mipmapImage4[i][j][2] = 0;
- mipmapImage4[i][j][3] = 255;
- }
- }
- for (i = 0; i < 2; i++) {
- for (j = 0; j < 2; j++) {
- mipmapImage2[i][j][0] = 0;
- mipmapImage2[i][j][1] = 0;
- mipmapImage2[i][j][2] = 255;
- mipmapImage2[i][j][3] = 255;
- }
- }
- mipmapImage1[0][0][0] = 255;
- mipmapImage1[0][0][1] = 255;
- mipmapImage1[0][0][2] = 255;
- mipmapImage1[0][0][3] = 255;
- }
- void init(void)
- {
- glEnable(GL_DEPTH_TEST);
- glShadeModel(GL_FLAT);
- glTranslatef(0.0, 0.0, -3.6);
- makeImages();
- 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_MIPMAP_NEAREST);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 32, 32, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, mipmapImage32);
- glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA, 16, 16, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, mipmapImage16);
- glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA, 8, 8, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, mipmapImage8);
- glTexImage2D(GL_TEXTURE_2D, 3, GL_RGBA, 4, 4, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, mipmapImage4);
- glTexImage2D(GL_TEXTURE_2D, 4, GL_RGBA, 2, 2, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, mipmapImage2);
- glTexImage2D(GL_TEXTURE_2D, 5, GL_RGBA, 1, 1, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, mipmapImage1);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
- glEnable(GL_TEXTURE_2D);
- }
- void display(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glBegin(GL_QUADS);
- glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
- glTexCoord2f(0.0, 8.0); glVertex3f(-2.0, 1.0, 0.0);
- glTexCoord2f(8.0, 8.0); glVertex3f(2000.0, 1.0, -6000.0);
- glTexCoord2f(8.0, 0.0); glVertex3f(2000.0, -1.0, -6000.0);
- glEnd();
- glFlush();
- }
- 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, 30000.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- }
- void keyboard (unsigned char key, int x, int y)
- {
- switch (key) {
- case 27:
- exit(0);
- break;
- default:
- break;
- }
- }
- int main(int argc, char** argv)
- {
- glutInit(&argc, argv);
- glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
- glutInitWindowSize (500, 500);
- glutInitWindowPosition (50, 50);
- glutCreateWindow (argv[0]);
- init ();
- glutDisplayFunc(display);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(keyboard);
- glutMainLoop();
- return 0;
- }