open.gl-tutorials-to-pyglet

Porting of the http://open.gl/ OpenGL tutorials sample code from C++ and SFML to Python and Pyglet

Tested with Pyglet 1.2.

TODO:

• The first 5 parts of the tutorial are done, finish the remaining 3.
• Get the bug fix of euclid.py into the official repository.
• The texture comes out reversed in 5-1 and 5-2, fix it by altering the tex coordinates.

Notes on translating from C++ and SFML to Python and Pyglet

More specifically the translation happens like so:

• C++ to Python and ctypes
• SFML to Pyglet
• GLEW to pyglet.gl
• SOIL to pyglet.image
• GLM to pyeuclid (there is a bug in the Matrix4.new_look_at method in the official version, use the version in this repository until the patch goes upstream)

Notes:

• from pyglet.gl import * gives you access to OpenGL.
• To create GLfloat arrays/lists you just create an ordinary list and then convert it like so: (GLfloat * len(list1))(*list1) , and the same for GLuint: (GLuint * len(list2))(*list2)
• You sometimes need to use python ctypes: from ctypes import * , in terms of the open.gl tutorials you mainly have to use pointer and sizeof for the C++ & and sizeof equivilants.
• Shader code is the same as in C++ given it is it's own language, you just put it in a string or in a seperate file, but to use it with glShaderSource you have to use the cast ctype, pointer and POINTER like so: glShaderSource(fragmentShader, count, cast(pointer(src), POINTER(POINTER(c_char))), None).
• Texture coordinates are reversed in pyglet.
• pyeuclid uses radians instead of degrees.
• To use the stencil buffer you have to enable it in the window config: allowstencil = pyglet.gl.Config(stencil_size=8) and window = pyglet.window.Window(800, 600, "OpenGL", config=allowstencil)