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# a sample with ruby-opengl and Ruby/SDL
require 'sdl'
require 'gl'
include Gl
# initialize SDL and opengl
SDL.init SDL::INIT_VIDEO
SDL::GL.set_attr SDL::GL_RED_SIZE,5
SDL::GL.set_attr SDL::GL_GREEN_SIZE,5
SDL::GL.set_attr SDL::GL_BLUE_SIZE,5
SDL::GL.set_attr SDL::GL_DEPTH_SIZE,16
SDL::GL.set_attr SDL::GL_DOUBLEBUFFER,1
SDL::Screen.open 640,400,16,SDL::OPENGL
glViewport( 0, 0, 640, 400 );
glMatrixMode( GL_PROJECTION );
glLoadIdentity( );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity( );
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glShadeModel(GL_SMOOTH);
shadedCube=true
color =
[[ 1.0, 1.0, 0.0],
[ 1.0, 0.0, 0.0],
[ 0.0, 0.0, 0.0],
[ 0.0, 1.0, 0.0],
[ 0.0, 1.0, 1.0],
[ 1.0, 1.0, 1.0],
[ 1.0, 0.0, 1.0],
[ 0.0, 0.0, 1.0]]
cube =
[[ 0.5, 0.5, -0.5],
[ 0.5, -0.5, -0.5],
[-0.5, -0.5, -0.5],
[-0.5, 0.5, -0.5],
[-0.5, 0.5, 0.5],
[ 0.5, 0.5, 0.5],
[ 0.5, -0.5, 0.5],
[-0.5, -0.5, 0.5]]
loop do
while event = SDL::Event2.poll
case event
when SDL::Event2::Quit, SDL::Event2::KeyDown
exit
end
end
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glBegin(GL_QUADS)
if shadedCube then
glColor(color[0]);
glVertex(cube[0]);
glColor(color[1]);
glVertex(cube[1]);
glColor(color[2]);
glVertex(cube[2]);
glColor(color[3]);
glVertex(cube[3]);
glColor(color[3]);
glVertex(cube[3]);
glColor(color[4]);
glVertex(cube[4]);
glColor(color[7]);
glVertex(cube[7]);
glColor(color[2]);
glVertex(cube[2]);
glColor(color[0]);
glVertex(cube[0]);
glColor(color[5]);
glVertex(cube[5]);
glColor(color[6]);
glVertex(cube[6]);
glColor(color[1]);
glVertex(cube[1]);
glColor(color[5]);
glVertex(cube[5]);
glColor(color[4]);
glVertex(cube[4]);
glColor(color[7]);
glVertex(cube[7]);
glColor(color[6]);
glVertex(cube[6]);
glColor(color[5]);
glVertex(cube[5]);
glColor(color[0]);
glVertex(cube[0]);
glColor(color[3]);
glVertex(cube[3]);
glColor(color[4]);
glVertex(cube[4]);
glColor(color[6]);
glVertex(cube[6]);
glColor(color[1]);
glVertex(cube[1]);
glColor(color[2]);
glVertex(cube[2]);
glColor(color[7]);
glVertex(cube[7]);
else
glColor(1.0, 0.0, 0.0);
glVertex(cube[0]);
glVertex(cube[1]);
glVertex(cube[2]);
glVertex(cube[3]);
glColor(0.0, 1.0, 0.0);
glVertex(cube[3]);
glVertex(cube[4]);
glVertex(cube[7]);
glVertex(cube[2]);
glColor(0.0, 0.0, 1.0);
glVertex(cube[0]);
glVertex(cube[5]);
glVertex(cube[6]);
glVertex(cube[1]);
glColor(0.0, 1.0, 1.0);
glVertex(cube[5]);
glVertex(cube[4]);
glVertex(cube[7]);
glVertex(cube[6]);
glColor(1.0, 1.0, 0.0);
glVertex(cube[5]);
glVertex(cube[0]);
glVertex(cube[3]);
glVertex(cube[4]);
glColor(1.0, 0.0, 1.0);
glVertex(cube[6]);
glVertex(cube[1]);
glVertex(cube[2]);
glVertex(cube[7]);
end
glEnd()
glMatrixMode(GL_MODELVIEW);
glRotate(5.0, 1.0, 1.0, 1.0);
SDL::GL.swap_buffers
end
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