Re: [glob2-devel] Perlin noise in libgag

[Stéphane Magnenat]

Hi,

I've implemented the generic alpha map drawing function. There is a software 
version in :
DrawableSurface::drawAlphaMap(...)
which renders plain tiles and an overloaded OpenGL version in
GraphicContext::drawAlphaMap(...)
which uses Leo's code to render map smoothly

Leo, could you try to use this rendering funciton? I suggest you make a 
DynamicClouds class in a new set of files (DynamicClouds.h/DynamicClouds.cpp) 
in src/. Such class could have a single member variable that is time and a 
single function that is render(DrawableSurface *dest, ...) which uses 
PerlinNoise class to create clouds and do a double call to drawAlphaMap(...) 
to render it. I've seen that your second pass does some extra computation, 
I'm not sure exactly what it does but I think drawAlphaMap(...) has 
sufficient genericity in its parameters to do the job, please correct me if 
I'm wrong. If we do so, we can remove any cloud/perlin noise code from libgag 
which is cleaner. We can also hope to use the same function to render 
activities maps :-)

In overall, what do you think? Do you agree the general idea?

Have a nice day,

Steph

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