From: Thijs Leeflang <t_leeflang@...>
Date: 2009-09-08T05:55:30+09:00
Subject: OpenGl and ruby

Hello all,

i have been working with ruby for less than a month now so sory if this
is a stupid mistake

i have been trying to get ruby to work with opengl,
i found an app which integrates ruby with gosu and opengl which is great
for me

but,
im trying to make a simple tile engine with opengl to show the actual
tiles
so i used gosu to load the tiles
and then in opengl drawing it,

i have been messing with the code a lot so i'ts bugy,
this is the class i have so far
i know this should just draw one tile and not a whole range but that卒s
something i want to program myself.

can anybody please help me?


class OpenGL
  def initialize(window)
    @TextureImage = Gosu::Image.load_tiles(window, "Media/Tiles.bmp",
32, 32, true)
    glClearColor(0.0, 0.0, 0.0, 0)
    glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);      # Really Nice
Perspective Calculations
    glHint(GL_POINT_SMOOTH_HINT,GL_NICEST);
    gluPerspective(45.0, 800 / 600, 0.1, 100.0)

    draw_gl(0,0,1)
  end

  def draw_gl(x, y, tile)
    info = @TextureImage[tile].gl_tex_info
    return unless info
    glDepthFunc(GL_GEQUAL)
    glEnable(GL_DEPTH_TEST)
    glEnable(GL_BLEND)

    glMatrixMode(GL_PROJECTION)
    glLoadIdentity
    glFrustum(-0.10, 0.10, -0.075, 0.075, 1, 100)

    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity
    glTranslate(0, 0, 1)

    glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST)
    glHint(GL_POINT_SMOOTH_HINT,GL_NICEST)
    glEnable(GL_TEXTURE_2D)
    glBindTexture(GL_TEXTURE_2D, info.tex_name)
    glBegin(GL_TRIANGLE_STRIP)
      glColor4d(1, 1, 1, 0)
      glTexCoord2d(info.left, info.top)
      glVertex3d(-0.5, -0.5, 0)

      glColor4d(1, 255, 1, 0)
      glTexCoord2d(info.left, info.bottom)
      glVertex3d(-0.5, 0.5, 0)

      glColor4d(1, 1, 255, 0)
      glTexCoord2d(info.right, info.top)
      glVertex3d(0.5, -0.5, 0)

      glColor4d(255, 1, 1, 0)
      glTexCoord2d(info.right, info.bottom)
      glVertex3d(0.5, 0.5, 0)
    glEnd
  end
end
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