Attachment 8936 Details for Bug 10149 – C file

C file

spotlight.c (text/plain), 1.97 KB, created by WuNian on 2007-03-01 22:54:32 UTC

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Creator: WuNian

Created: 2007-03-01 22:54:32 UTC

Size: 1.97 KB

patch

obsolete

>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <math.h>
>
>#define PIXEL_COLOR 0.8
>
>GLfloat normal[3], position[4], direction[3];
>
>void init(void)
>{
>    GLfloat buf[4];
>
>    glClearColor(0.0, 0.0, 0.0, 0.0);
>    glDisable(GL_DITHER);
>    glEnable(GL_LIGHTING);
>
>    glEnable(GL_LIGHT0);
>
>    glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 80);
>
>    // Setup polymode and twoSided switch. 
>
>    glPolygonMode (GL_FRONT_AND_BACK, GL_POINT);
>    glLightModeli (GL_LIGHT_MODEL_TWO_SIDE, GL_FALSE);
>
>    direction[0] = 0;
>    direction[1] = 0;
>    direction[2] = -1;
>    glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, direction);
>
>    // Setup light position.
>
>    position[0] = sqrt(1.0 - PIXEL_COLOR*PIXEL_COLOR);
>    position[1] = 0.0;
>    position[2] = PIXEL_COLOR;
>    position[3] = 0.0;
>    glLightfv(GL_LIGHT0, GL_POSITION, position);
>
>    glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 1);
>
>    buf[0] = 1.0;
>    buf[1] = 1.0;
>    buf[2] = 1.0;
>    buf[3] = 1.0;
>    glMaterialfv(GL_LIGHT0, GL_AMBIENT, buf);
>    glLightfv(GL_FRONT, GL_AMBIENT, buf);
>
>    buf[0] = 0.0;
>    buf[1] = 0.0;
>    buf[2] = 0.0;
>    buf[3] = 1.0;
>    glMaterialfv(GL_FRONT, GL_DIFFUSE, buf);
>    glMaterialfv(GL_FRONT, GL_SPECULAR, buf);
>    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, buf);
>}
>
>static void test(void)
>{    
>    glBegin(GL_POINTS);
>        glVertex2f(0.5, 0.5);
>    glEnd();
>}
>
>void display(void)
>{
>    GLfloat buf[3];
>
>    glViewport(0, 0, 10, 10);
>        glMatrixMode(GL_PROJECTION);
>        glLoadIdentity();
>    gluOrtho2D(0, 10, 0, 10);
>        glMatrixMode(GL_MODELVIEW);
>        glLoadIdentity();
>
>    test();
>
>    glReadPixels(0, 0, 1, 1, GL_RGB, GL_FLOAT, (GLvoid *)buf);
>
>    printf ("actual buf[0]: %f, expected: %f\n", buf[0], PIXEL_COLOR);
>}
>
>int main(int argc, char** argv)
>{
>   glutInit(&argc, argv);
>   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
>   glutInitWindowSize(10, 10);
>   glutInitWindowPosition(20, 20);
>   glutCreateWindow(argv[0]);
>   init();
>   glutDisplayFunc(display);
>   glutMainLoop();
>   return 0; 
>}

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Attachments on bug 10149: 8936

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