1 ;;; Gacela, a GNU Common Lisp extension for fast games development
2 ;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot org>
4 ;;; This program is free software: you can redistribute it and/or modify
5 ;;; it under the terms of the GNU General Public License as published by
6 ;;; the Free Software Foundation, either version 3 of the License, or
7 ;;; (at your option) any later version.
9 ;;; This program is distributed in the hope that it will be useful,
10 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ;;; GNU General Public License for more details.
14 ;;; You should have received a copy of the GNU General Public License
15 ;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
29 (defun draw (&rest vertexes)
30 (begin-draw (length vertexes))
31 (draw-vertexes vertexes)
34 (defun begin-draw (number-of-points)
35 (cond ((= number-of-points 3) (glBegin GL_TRIANGLES))
36 ((= number-of-points 4) (glBegin GL_QUADS))))
38 (defun draw-vertexes (vertexes)
39 (cond ((null vertexes) nil)
40 (t (draw-vertex (car vertexes))
41 (draw-vertexes (cdr vertexes)))))
43 (defun draw-vertex (vertex &key texture-coord)
44 (cond ((consp (car vertex)) (draw-color (car vertex)) (apply #'simple-draw-vertex (cadr vertex)))
45 (t (cond (texture-coord (apply #'glTexCoord2f texture-coord)))
46 (apply #'simple-draw-vertex vertex))))
48 (defun simple-draw-vertex (x y &optional (z 0))
49 (cond ((3d-mode?) (glVertex3f x y z))
50 (t (glVertex2f x y))))
52 (defun draw-color (color)
53 (apply #'glColor3f color))
55 (defun load-texture (filename &optional (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
58 (let ((image (IMG_Load filename)))
60 (let ((width (surface-w image)) (height (surface-h image))
61 (texture (car (glGenTextures 1))))
62 (glBindTexture GL_TEXTURE_2D texture)
63 (glTexImage2D GL_TEXTURE_2D 0 3 width height 0 GL_RGB GL_UNSIGNED_BYTE (surface-pixels image))
64 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
65 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
66 (SDL_FreeSurface image)
67 (values texture width height))))))
69 (defun draw-image-function (filename)
71 (texture width height) (load-texture filename)
73 (lambda (&optional (f 1))
74 (draw-rectangle (* f width) (* f height) :texture texture))))))
76 (defun draw-quad (v1 v2 v3 v4 &key texture color)
77 (cond (texture (glBindTexture GL_TEXTURE_2D texture)
79 (draw-vertex v1 :texture-coord '(0 0))
80 (draw-vertex v2 :texture-coord '(1 0))
81 (draw-vertex v3 :texture-coord '(1 1))
82 (draw-vertex v4 :texture-coord '(0 1))
84 (t (cond (color (draw-color color)))
87 (defun draw-rectangle (width height &key texture color)
88 (let* ((w (/ width 2)) (-w (neg w)) (h (/ height 2)) (-h (neg h)))
89 (draw-quad (list -w h 0) (list w h 0) (list w -h 0) (list -w -h 0) :texture texture :color color)))
91 (defun draw-square (&key (size 1) texture color)
92 (draw-rectangle size size :texture texture :color color))
94 (defun draw-cube (&key size texture color)
95 (let ((-size (neg size)))
96 (enable :textures texture)
98 (draw-quad (list -size size size) (list size size size) (list size -size size) (list -size -size size) :texture texture :color color)
100 (draw-quad (list -size -size -size) (list size -size -size) (list size size -size) (list -size size -size) :texture texture :color color)
102 (draw-quad (list size size size) (list -size size size) (list -size size -size) (list size size -size) :texture texture :color color)
104 (draw-quad (list -size -size size) (list size -size size) (list size -size -size) (list -size -size -size) :texture texture :color color)
106 (draw-quad (list size -size -size) (list size -size size) (list size size size) (list size size -size) :texture texture :color color)
108 (draw-quad (list -size -size size) (list -size -size -size) (list -size size -size) (list -size size size) :texture texture :color color)))
110 (defun add-light (&key light position ambient (id GL_LIGHT1) (turn-on t))
112 (and light (glLightfv id GL_DIFFUSE (first light) (second light) (third light) (fourth light)))
113 (and light position (glLightfv GL_POSITION (first position) (second position) (third position) (fourth position)))
114 (and ambient (glLightfv id GL_AMBIENT (first ambient) (second ambient) (third ambient) (fourth ambient)))
115 (and turn-on (glEnable id))
118 (defun translate (x y &optional (z 0))
119 (glTranslatef x y z))
121 (defun rotate (xrot yrot &optional zrot)
122 (glRotatef xrot 1 0 0)
123 (glRotatef yrot 0 1 0)
124 (cond (zrot (glRotatef zrot 0 0 1))))
126 (defun enable (&key textures)
127 (cond (textures (glEnable GL_TEXTURE_2D))))