cube based on open-gl's cube.c ... almost works

This commit is contained in:
Dan Ballard 2011-06-29 23:07:33 -07:00
parent da9eca6122
commit 5b0900ca93
1 changed files with 66 additions and 0 deletions

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cube.lisp Normal file
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(defparameter *light-diffuse* (vector 1.0 0.0 0.0 1.0)) ;; red diffuse light
(defparameter *light-position* (vector 1.0 1.0 1.0 0.0)) ;; infinite light position
;;; Normals for the 6 faces of the cube
(defparameter *n* '((-1.0 0.0 0.0) (0.0 1.0 0.0) (1.0 0.0 0.0)
(0.0 -1.0 0.0) (0.0 0.0 1.0) (0.0 0.0 -1.0)))
;;; Vertex indices for the 6 faces of the cube
(defparameter *faces* '((0 1 2 3) (2 3 6 7) (7 6 5 4)
(4 5 1 0) (5 6 2 1) (7 4 0 3)))
;;; will be filled with the vertexes
(defparameter *v* '((-1 -1 1) (-1 -1 -1) (-1 1 -1) (-1 1 1)
(1 -1 1) (1 -1 -1) (1 1 -1) (1 1 1)))
(defmacro 2elt (e x y)
`(elt (elt ,e ,x) ,y))
(defmacro 3delt (e1 x1 e2 x3)
`(elt (elt ,e2 (elt ,e1 ,x1)) ,x3))
(defun draw-box ()
(dotimes (i 6)
(gl:with-primitives :quads
(gl:normal (2elt *n* i 0) (2elt *n* i 1) (2elt *n* i 2))
(let ((face (elt *faces* i)))
(dotimes (x 4)
(gl:vertex (3delt face x *v* 0) (3delt face x *v* 1) (3delt face x *v* 1)))))))
(cffi:defcallback display :void ()
(gl:clear :color-buffer-bit :depth-buffer-bit)
(draw-box)
;;glut:swap-buffers
)
(defun init ()
(gl:light :light0 :diffuse *light-diffuse*)
(gl:light :light0 :position *light-position*)
(gl:enable :light0 :lighting :depth-test)
(gl:matrix-mode :projection)
(glu:perspective 40.0 ;; FOV
1.0 ;; aspect ratio
1.0 ;; z near
10.0 ;; z far
)
(gl:matrix-mode :modelview)
(glu:look-at 0 0 5 ;; eye is at 0,0,5
0 0 0 ;; center is at 0,0,0
0 1 0 ;;up is in pos Y
)
;; adjust cube position to be asthetic angle
(gl:translate 0.0 0.0 -1.0)
(gl:rotate 60 1.0 0.0 0.0)
(gl:rotate -20 0.0 0.0 1.0))
(defun cube-main ()
(glut:init "Cube")
(glut:init-display-mode :double :rgb :depth)
(glut:create-window "red 3D lighted cube")
(glut:display-func (cffi:callback display))
(init)
(glut:main-loop)
)