Make Context Current

A Window is not simply a GUI window on the screen - it is also an OpenGL or OpenGL ES context. OpenGL and OpenGL ES can juggle multiple contexts, but only one context can be targeted at once. This context is the "current context."

make_context_current

You can declare which context should be the current context by using the make_current_context method:

winston = Window.new
wilfred = Window.new

winston.make_context_current

In the above example, even though both winston and wilfred are valid OpenGL contexts, winston becomes the current context and will be the Window to receive draw calls until wilfred demands to be the current context.

make_context_current must be called from within a run block definition.