Shader coders?

[Pierre-Luc Beaudoin <pierre-luc pierlux com>]

Hi,

To blur the shadow of markers, I though we could use a shader.  Well, I
don't have that knowledge or the time to learn how to write them :)

Anyone wants to have a look at the shadow branch on mainline? It
contains a predrawn shadow (in priv->shadow) that needs to be blured.
All the code is there, only the working SHADER code is missing.

Also, that branch is buggy because it recompiles the shader constantly..
Will be fixed before merging hehe

Pierre-Luc