;; Example 13-3 Picking example (use gl) (use gl.glut) (use gauche.uvector) (use gauche.array) (define *board* (make-array (shape 0 3 0 3) 0)) (define (init) (gl-clear-color 0.0 0.0 0.0 0.0)) (define (draw-squares mode) (dotimes (i 3) (when (= mode GL_SELECT) (gl-load-name i)) (dotimes (j 3) (when (= mode GL_SELECT) (gl-push-name j)) (gl-color (/ i 3.0) (/ j 3.0) (/ (array-ref *board* i j) 3.0)) (gl-rect i j (+ i 1) (+ j 1)) (when (= mode GL_SELECT) (gl-pop-name))))) (define (process-hits hits vec) (print #`"hits = ,hits") (let ((ptr 0) (ii 0) (jj 0)) (dotimes (i hits) (let1 names (ref vec ptr) (print #`" number of names for hit = ,names") (inc! ptr) (print #`" z1 is ,(/ (ref vec ptr) #x7fffffff);" #`" z2 is ,(/ (ref vec (+ ptr 1)) #x7fffffff)") (inc! ptr 2) (display " the name is ") (dotimes (j names) (display #`",(ref vec ptr) ") (cond ((= j 0) (set! ii (ref vec ptr))) ((= j 1) (set! jj (ref vec ptr)))) (inc! ptr)) (print) (array-set! *board* ii jj (modulo (+ (array-ref *board* ii jj) 1) 3)))))) (define-constant BUFSIZE 512) (define (pick-squares button state x y) (let1 select-buf (make-u32vector BUFSIZE 0) (when (and (= button GLUT_LEFT_BUTTON) (= state GLUT_DOWN)) (let1 viewport (gl-get-integer GL_VIEWPORT) (gl-select-buffer select-buf) (gl-render-mode GL_SELECT) (gl-init-names) (gl-push-name 0) (gl-matrix-mode GL_PROJECTION) (gl-push-matrix) (gl-load-identity) (glu-pick-matrix x (- (ref viewport 3) y) 5.0 5.0 viewport) (glu-ortho-2d 0.0 3.0 0.0 3.0) (draw-squares GL_SELECT) (gl-matrix-mode GL_PROJECTION) (gl-pop-matrix) (gl-flush) (process-hits (gl-render-mode GL_RENDER) select-buf) (glut-post-redisplay))))) (define (disp) (gl-clear GL_COLOR_BUFFER_BIT) (draw-squares GL_RENDER) (gl-flush)) (define (reshape w h) (gl-viewport 0 0 w h) (gl-matrix-mode GL_PROJECTION) (gl-load-identity) (glu-ortho-2d 0.0 3.0 0.0 3.0) (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-init-window-size 100 100) (glut-init-window-position 100 100) (glut-create-window (car args)) (init) (glut-mouse-func pick-squares) (glut-reshape-func reshape) (glut-display-func disp) (glut-keyboard-func keyboard) (glut-main-loop) 0)