Ruby で OpenGL
Ruby でも OpenGL が使えるようですが、日本語ではぐぐっても古い情報が多いので、できるかやってみました。Linux Mint 17.2, Ruby 2.2.3 で確認しました。
'OpenGL' という Gem(公式HP)を入れればいいのですが、その前に Linux の OpenGL 関係のライブラリをいれる必要があります。公式HP には
- libgl1-mesa-dri
- libglu1-mesa
- freeglut3
- libgl1-mesa-dev
- libglu1-mesa-dev
- freeglut3-dev
を入れよとあるので、僕はすべて「ソフトウェアの管理」(パッケージマネージャ)から入れました。既に入っているのもありました。
$ sudo apt install libgl1-mesa-dri libglu1-mesa freeglut3 libgl1-mesa-dev libglu1-mesa-dev freeglut3-dev
Gem のインストールは僕は Bundler でやりました。Bundler を使っていない場合は gem install opengl で OK です。また、'Glu と ''Glut' という Gem も必須のようなので、これも入れました。あとは、ここのサンプルコードで試したところ、実際にできました。これだけのことで OpenGL が Ruby で使えます。使い方は公式HP に書いてあります。
なお、ここのマウスでぐるぐる動くティーポットはやってみたかったのですが、何故かエラーが出てダメでした。僕の能力ではここまでですね。
(※追記 ちゃんと動きました。ただし元のコードに require 'glu'
と include Gl, Glu, Glut
を追加する必要があります。)
Gem のネット上のサンプルコードを、ここにまとめました。参考になれば幸いです。
公式HP をよく読んでみたら、exmple というフォルダにサンプルコードがたくさんありますね。例えばこんな画像が描けます。
コードは以下。Bundler を使っていない人は、require 'bundler/setup'
を消して下さい。
aapoly.rb
# # Copyright (c) 1993-1997, Silicon Graphics, Inc. # ALL RIGHTS RESERVED # Permission to use, copy, modify, and distribute this software for # any purpose and without fee is hereby granted, provided that the above # copyright notice appear in all copies and that both the copyright notice # and this permission notice appear in supporting documentation, and that # the name of Silicon Graphics, Inc. not be used in advertising # or publicity pertaining to distribution of the software without specific, # written prior permission. # # THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" # AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, # INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR # FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON # GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, # SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY # KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, # LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF # THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN # ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON # ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE # POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. # # US Government Users Restricted Rights # Use, duplication, or disclosure by the Government is subject to # restrictions set forth in FAR 52.227.19(c)(2) or subparagraph # (c)(1)(ii) of the Rights in Technical Data and Computer Software # clause at DFARS 252.227-7013 and/or in similar or successor # clauses in the FAR or the DOD or NASA FAR Supplement. # Unpublished-- rights reserved under the copyright laws of the # United States. Contractor/manufacturer is Silicon Graphics, # Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311. # # OpenGL(R) is a registered trademark of Silicon Graphics, Inc. # # aapoly.c # This program draws filled polygons with antialiased # edges. The special GL_SRC_ALPHA_SATURATE blending # function is used. # Pressing the 't' key turns the antialiasing on and off. require 'bundler/setup' require 'opengl' require 'glu' require 'glut' include Gl,Glu,Glut $polySmooth = true def init glCullFace(GL_BACK) glEnable(GL_CULL_FACE) glBlendFunc(GL_SRC_ALPHA_SATURATE, GL_ONE) glClearColor(0.0, 0.0, 0.0, 0.0) end NFACE=6 NVERT=8 $indices = [ [4, 5, 6, 7], [2, 3, 7, 6], [0, 4, 7, 3], [0, 1, 5, 4], [1, 5, 6, 2], [0, 3, 2, 1] ] def drawCube(x0, x1, y0, y1, z0, z1) v = [[],[],[],[],[],[],[],[]] c = [ [0.0, 0.0, 0.0, 1.0], [1.0, 0.0, 0.0, 1.0], [0.0, 1.0, 0.0, 1.0], [1.0, 1.0, 0.0, 1.0], [0.0, 0.0, 1.0, 1.0], [1.0, 0.0, 1.0, 1.0], [0.0, 1.0, 1.0, 1.0], [1.0, 1.0, 1.0, 1.0] ] # indices of front, top, left, bottom, right, back faces v[0][0] = v[3][0] = v[4][0] = v[7][0] = x0 v[1][0] = v[2][0] = v[5][0] = v[6][0] = x1 v[0][1] = v[1][1] = v[4][1] = v[5][1] = y0 v[2][1] = v[3][1] = v[6][1] = v[7][1] = y1 v[0][2] = v[1][2] = v[2][2] = v[3][2] = z0 v[4][2] = v[5][2] = v[6][2] = v[7][2] = z1 glEnableClientState(GL_VERTEX_ARRAY) glEnableClientState(GL_COLOR_ARRAY) glVertexPointer(3, GL_FLOAT, 0, v.flatten!.pack("f*")) glColorPointer(4, GL_FLOAT, 0, c.flatten!.pack("f*")) glDrawElements(GL_QUADS, NFACE*4, GL_UNSIGNED_BYTE, $indices.flatten.pack("C*")) glDisableClientState(GL_VERTEX_ARRAY) glDisableClientState(GL_COLOR_ARRAY) end # Note: polygons must be drawn from front to back # for proper blending. display = proc do if ($polySmooth) glClear(GL_COLOR_BUFFER_BIT) glEnable(GL_BLEND) glEnable(GL_POLYGON_SMOOTH) glDisable(GL_DEPTH_TEST) else glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) glDisable(GL_BLEND) glDisable(GL_POLYGON_SMOOTH) glEnable(GL_DEPTH_TEST) end glPushMatrix() glTranslate(0.0, 0.0, -8.0) glRotate(30.0, 1.0, 0.0, 0.0) glRotate(60.0, 0.0, 1.0, 0.0) drawCube(-0.5, 0.5, -0.5, 0.5, -0.5, 0.5) glPopMatrix() glutSwapBuffers() end reshape = proc do |w, h| glViewport(0, 0, w, h) glMatrixMode(GL_PROJECTION) glLoadIdentity() gluPerspective(30.0, w.to_f/ h.to_f, 1.0, 20.0) glMatrixMode(GL_MODELVIEW) glLoadIdentity() end keyboard = proc do |key, x, y| case (key) when ?t ,?T $polySmooth = !$polySmooth glutPostRedisplay() when ?\e exit(0) # Escape key end end # Main Loop glutInit glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_ALPHA | GLUT_DEPTH) glutInitWindowSize(500, 500) glutInitWindowPosition(100, 100) glutCreateWindow($0) init() glutReshapeFunc(reshape) glutKeyboardFunc(keyboard) glutDisplayFunc(display) glutMainLoop()