SH-2031 Fix for stall in image update -- don't use the CPU to convert a height map into a normal map -- use the GPU instead via a shader.  Also, WTF glFinish?

SH-2481 Potential fix for viewer detecting incorrect amount of vram available when using certain video cards.

SH-2428 Make GCC 4.4 happy by using LLVector4a striders with LLAlphaObject subclasses -- also vectorize particle VBO updates

SH-2447, SH-2525, SH-2276 Strip out defunct global illumination code, add accounting for how much memory is taken up by LLRenderTarget, fix crash on login in bindGLIndices (work around driver bug that doesn't respect VAO state WRT to index buffers), remove some unused render targets, remove some unused shaders, make it possible to run a fullscreen session

SH-2276 Fix for failed assertions reported from debug-enabled viewers.  Also, remove "Basic Shaders" as a user settable option (shaders are always on if GL version >= 2.0, always off otherwise)

SH-2244 Don't use multisample texture (ever), and don't use GL_DEPTH_COMPONENT32 (use GL_DEPTH_COMPONENT24)

SH-2465 Move FXAA to its own pass independent of DoF (also removes the need to reload shaders when toggling FSAA on and off)

SH-2465 Move FXAA to its own pass independent of DoF (also removes the need to reload shaders when toggling FSAA on and off)

SH-2507 Potential fix for basic shaders causing objects to disappear with some drivers (prune shader tree of unused shaders while we're at it)

SH-2507 Potential fix for basic shaders causing objects to disappear with some drivers (prune shader tree of unused shaders while we're at it)