;; Example 5-1 Drawing a Lit Sphere (use gl) (use gl.glut) (define (init) (gl-clear-color 0.0 0.0 0.0 0.0) (gl-shade-model GL_SMOOTH) (gl-material GL_FRONT GL_SPECULAR '#f32(1.0 1.0 1.0 1.0)) (gl-material GL_FRONT GL_SHININESS 50.0) (gl-light GL_LIGHT0 GL_POSITION '#f32(1.0 1.0 1.0 0.0)) (gl-enable GL_LIGHTING) (gl-enable GL_LIGHT0) (gl-enable GL_DEPTH_TEST) ) (define (disp) (gl-clear (logior GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT)) (glut-solid-sphere 1.0 20 16) (gl-flush) ) (define (reshape w h) (gl-viewport 0 0 w h) (gl-matrix-mode GL_PROJECTION) (gl-load-identity) (if (<= w h) (gl-ortho -1.5 1.5 (* -1.5 (/ h w)) (* 1.5 (/ h w)) -10.0 10.0) (gl-ortho (* -1.5 (/ w h)) (* 1.5 (/ w h)) -1.5 1.5 -10.0 10.0)) (gl-matrix-mode GL_MODELVIEW) (gl-load-identity) ) (define (keyboard key x y) (when (= key 27) (exit 0))) (define (main args) (glut-init args) (glut-init-display-mode (logior GLUT_SINGLE GLUT_RGB GLUT_DEPTH)) (glut-init-window-size 500 500) (glut-init-window-position 100 100) (glut-create-window *program-name*) (init) (glut-display-func disp) (glut-reshape-func reshape) (glut-keyboard-func keyboard) (glut-main-loop) 0)