图形学实验报告(10)

#include #include #include

#ifdef GL_VERSION_1_1

/* Create checkerboard texture */ #define checkImageWidth 64 #define checkImageHeight 64

static GLubyte checkImage[checkImageHeight][checkImageWidth][4]; static GLubyte otherImage[checkImageHeight][checkImageWidth][4];

static GLuint texName[2];

void makeCheckImages(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;

c = ((((i&0x10)==0)^((j&0x10))==0))*255; otherImage[i][j][0] = (GLubyte) c; otherImage[i][j][1] = (GLubyte) 0; otherImage[i][j][2] = (GLubyte) 0; otherImage[i][j][3] = (GLubyte) 255; } } }

void init(void) {

glClearColor (0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); glEnable(GL_DEPTH_TEST);

makeCheckImages();

glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

glGenTextures(2, texName);

glBindTexture(GL_TEXTURE_2D, texName[0]);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); 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, GL_RGBA, checkImageWidth, checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage);

glBindTexture(GL_TEXTURE_2D, texName[1]);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth, checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, otherImage); glEnable(GL_TEXTURE_2D); }

void display(void) {

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glBindTexture(GL_TEXTURE_2D, texName[0]); glBegin(GL_QUADS);

glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);

glTexCoord2f(0.0, 1.0); glVertex3f(-2.0, 1.0, 0.0); glTexCoord2f(1.0, 1.0); glVertex3f(0.0, 1.0, 0.0); glTexCoord2f(1.0, 0.0); glVertex3f(0.0, -1.0, 0.0); glEnd();

glBindTexture(GL_TEXTURE_2D, texName[1]); glBegin(GL_QUADS);

glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0); glTexCoord2f(0.0, 1.0); glVertex3f(1.0, 1.0, 0.0);

glTexCoord2f(1.0, 1.0); glVertex3f(2.41421, 1.0, -1.41421); glTexCoord2f(1.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421); 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, 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 27: exit(0); 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();

glutReshapeFunc(reshape); glutDisplayFunc(display); glutKeyboardFunc (keyboard); glutMainLoop(); return 0; }