;; Example 1-3 (use gl) (use gl.glut) (define *spin* 0.0) (define (init) (gl-clear-color 0.0 0.0 0.0 0.0) (gl-shade-model GL_FLAT) ) (define (disp) (gl-clear GL_COLOR_BUFFER_BIT) (gl-push-matrix) (gl-rotate *spin* 0.0 0.0 1.0) (gl-color '#f32(1.0 1.0 1.0)) (gl-rect '#f32(-25.0 -25.0) '#f32(25.0 25.0)) (gl-pop-matrix) (glut-swap-buffers) ) (define (spin-display) (set! *spin* (modulo (+ *spin* 2.0) 360.0)) (glut-post-redisplay) ) (define (reshape w h) (gl-viewport 0 0 w h) (gl-matrix-mode GL_PROJECTION) (gl-load-identity) (gl-ortho -50.0 50.0 -50.0 50.0 -1.0 1.0) (gl-matrix-mode GL_MODELVIEW) (gl-load-identity) ) (define (mouse button state x y) (cond ((= button GLUT_LEFT_BUTTON) (when (= state GLUT_DOWN) (glut-idle-func spin-display))) ((= button GLUT_MIDDLE_BUTTON) (when (= state GLUT_DOWN) (glut-idle-func #f)))) ) (define (keyboard key x y) (cond ((= key 27) (exit 0)) )) (define (main args) (glut-init args) (glut-init-display-mode (logior GLUT_DOUBLE GLUT_RGB)) (glut-init-window-size 250 250) (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-mouse-func mouse) (glut-main-loop) 0)