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- #include <GL/gl.h>
- #include <GL/glu.h>
- #include <GL/glut.h>
- #include <stdlib.h>
- #include <stdio.h>
- #define stripeImageWidth 32
- GLubyte stripeImage[4*stripeImageWidth];
- static GLuint texName;
- void makeStripeImage(void)
- {
- int j;
- for (j = 0; j < stripeImageWidth; j++) {
- stripeImage[4*j] = (GLubyte) ((j<=4) ? 255 : 0);
- stripeImage[4*j+1] = (GLubyte) ((j>4) ? 255 : 0);
- stripeImage[4*j+2] = (GLubyte) 0;
- stripeImage[4*j+3] = (GLubyte) 255;
- }
- }
- /* planes for texture coordinate generation */
- static GLfloat xequalzero[] = {1.0, 0.0, 0.0, 0.0};
- static GLfloat slanted[] = {1.0, 1.0, 1.0, 0.0};
- static GLfloat *currentCoeff;
- static GLenum currentPlane;
- static GLint currentGenMode;
- void init(void)
- {
- glClearColor (0.0, 0.0, 0.0, 0.0);
- glEnable(GL_DEPTH_TEST);
- glShadeModel(GL_SMOOTH);
- makeStripeImage();
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glGenTextures(1, &texName);
- glBindTexture(GL_TEXTURE_1D, texName);
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER,
- GL_LINEAR);
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER,
- GL_LINEAR);
- glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA, stripeImageWidth, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, stripeImage);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- currentCoeff = xequalzero;
- currentGenMode = GL_OBJECT_LINEAR;
- currentPlane = GL_OBJECT_PLANE;
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, currentGenMode);
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glEnable(GL_TEXTURE_GEN_S);
- glEnable(GL_TEXTURE_1D);
- glEnable(GL_CULL_FACE);
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glEnable(GL_AUTO_NORMAL);
- glEnable(GL_NORMALIZE);
- glFrontFace(GL_CW);
- glCullFace(GL_BACK);
- glMaterialf (GL_FRONT, GL_SHININESS, 64.0);
- }
- void display(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glPushMatrix ();
- glRotatef(45.0, 0.0, 0.0, 1.0);
- glBindTexture(GL_TEXTURE_1D, texName);
- glutSolidTeapot(2.0);
- glPopMatrix ();
- glFlush();
- }
- void reshape(int w, int h)
- {
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- glOrtho (-3.5, 3.5, -3.5*(GLfloat)h/(GLfloat)w,
- 3.5*(GLfloat)h/(GLfloat)w, -3.5, 3.5);
- else
- glOrtho (-3.5*(GLfloat)w/(GLfloat)h,
- 3.5*(GLfloat)w/(GLfloat)h, -3.5, 3.5, -3.5, 3.5);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- }
- void keyboard (unsigned char key, int x, int y)
- {
- switch (key) {
- case 'e':
- case 'E':
- currentGenMode = GL_EYE_LINEAR;
- currentPlane = GL_EYE_PLANE;
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, currentGenMode);
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glutPostRedisplay();
- break;
- case 'o':
- case 'O':
- currentGenMode = GL_OBJECT_LINEAR;
- currentPlane = GL_OBJECT_PLANE;
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, currentGenMode);
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glutPostRedisplay();
- break;
- case 's':
- case 'S':
- currentCoeff = slanted;
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glutPostRedisplay();
- break;
- case 'x':
- case 'X':
- currentCoeff = xequalzero;
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- 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(256, 256);
- glutInitWindowPosition(100, 100);
- glutCreateWindow (argv[0]);
- init ();
- glutDisplayFunc(display);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(keyboard);
- glutMainLoop();
- return 0;
- }
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