***Description***
TclGles20 is a layer package for [APWTCL], which makes some of the [OpenGL es] 2.0 commands available (callable) from [Tcl].

A Vertex has the [Tcl] form ([[list position color]]):

======
  [list [list x y z] [list r g b a]]
======

Position and color values are float values (colors between 0.0 .. 1.0).

Here is a list of the planned commands (all live in namespace ::gles20):
%|done|command|param1|param2|param3|param4|param5|param6|param7|param8|%
&|x|clearbuffer|red|green|blue|alpha|||||&
&||compileshaders|||||||||&
&||drawline|start_vertex|end_vertex|||||||&
&||drawrectangle|vertex1|vertex2|vertex3|vertex4|||||&
&||drawtexturerectangle|vertex1|vertex2|vertex3|vertex4|||||&
&||drawtexturetriangle|vertex1|vertex2|vertex3||||||&
&||drawtriangle|vertex1|vertex2|vertex3||||||&
&||fillrectangle|vertex1|vertex2|vertex3|vertex4|||||&
&||filltexturerectangle|vertex1|vertex2|vertex3|vertex4|||||&
&||filltexturetriangle|vertex1|vertex2|vertex3||||||&
&||filltriangle|vertex1|vertex2|vertex3||||||&
&||getfontinfo|text|font_name|font_size|background|foreground|maxwidth|maxheight|measureonly|&
&||maketexttexture|||||||||&
&||rotate|||||||||&
&||setupframebuffer|||||||||&
&||setuprenderbuffer|||||||||&
&||swapheaders|||||||||&




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