..
   Copyright (c) 2018-2025 William Emerison Six

   Permission is granted to copy, distribute and/or modify this document
   under the terms of the GNU Free Documentation License, Version 1.3
   or any later version published by the Free Software Foundation;
   with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

   A copy of the license is available at
   https://www.gnu.org/licenses/fdl-1.3.html.


********************************
OpenGL3.3 Core Profile - Demo 21
********************************

Objective
^^^^^^^^^

In OpenGL 3.3 Core Profile, shaders are no longer optional,
they are mandatory.



How to Execute
^^^^^^^^^^^^^^

Load src/modelviewprojection/demo21/demo21.py in Spyder and hit the play button.


Move the Paddles using the Keyboard
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

==============  ==============================================
Keyboard Input  Action
==============  ==============================================
*w*             Move Left Paddle Up
*s*             Move Left Paddle Down
*k*             Move Right Paddle Down
*i*             Move Right Paddle Up

*d*             Increase Left Paddle's Rotation
*a*             Decrease Left Paddle's Rotation
*l*             Increase Right Paddle's Rotation
*j*             Decrease Right Paddle's Rotation

*UP*            Move the camera up, moving the objects down
*DOWN*          Move the camera down, moving the objects up
*LEFT*          Move the camera left, moving the objects right
*RIGHT*         Move the camera right, moving the objects left

*q*             Rotate the square around its center
*e*             Rotate the square around paddle 1's center
==============  ==============================================

Description
^^^^^^^^^^^


.. literalinclude:: ../../src/modelviewprojection/demo21/demo.py
   :language: python

.. literalinclude:: ../../src/modelviewprojection/demo21/triangle.vert
   :language: glsl

.. literalinclude:: ../../src/modelviewprojection/demo21/triangle.frag
   :language: glsl

.. literalinclude:: ../../src/modelviewprojection/demo21/ground.vert
   :language: glsl

.. literalinclude:: ../../src/modelviewprojection/demo21/ground.frag
   :language: glsl





Code
^^^^





The Event Loop
~~~~~~~~~~~~~~