7113c10f4b
This is a new patch that allow to define a different texture for top and bottom of clouds. It uses the overcast_top.rgb you made for me last time. What the patch do is to install a ssgStateSelector instead of a ssgSimpleState for each layer. The SGCloudLayer::draw method is modified to accept a boolean that will select the proper state: 0/false for bottom, 1/true for top. Then, in SGSky::drawUpperClouds and SGSky::drawLowerClouds, SGCloudLayer::draw is called with false and true because we see the bottom of upper clouds and the top of lower clouds. Only overcast has 2 textures, the other types share the same state for top and bottom, but that could be modified in SGCloudLayer::rebuild.
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