Performance Todo list

No Change render

• If only camera and uniform change (no node dirty, no StateAttribute dirty) after a viewer update, just apply last frame glcalls with uniform update. (only the glcalls, no cull, no draw)

Inter Frame Cache

• CullVisitor Node cache (only compute/transform node with modified children)
• State Graph Cache: reuse scene previous state attached to geometry, when no change in hierarchy above
• Store compute bounds dirty flags generalized to visitor with specific flags or a way to tell that this frame not bounds change at all was needed. (shadow compute bound visitor recomputed each frame because specific flags.)
• Reuse frustum culling info from last frame (coherent culling algorithms)

Reduce pressure on WebGL

• prune unnecessary calls: glViewport
• Only bind uniform on Shader program change and/or value Change
• Only bind texture null if render texture is the texture slot being null Binded
• Only bind texture if not already Binded
• Uniform packing
• Texture unit dynamic binding (using texture unit int uniform)
• Resources cache: identify duplicate resources (Mesh, Textures, Shader) and reuse them
• Always enable frustum culling
• Do not reset states to zero between frames when single viewer #399
• Fix Vertex Attribute and Material absence of link so that Shader Compiler know really what VA are needed
• Use/allow Vertex Array Object extension
• Use/allow UINT index buffer
• Compress Vertex Atribute (vertex color = 8bits, normal => 16bits, etc.)

Computation Optimizations

• If Rigid Body Transforms only, enable "Uniform scaling" mode: only Compute and Bind NormalMatrix shader parameter if using non-uniform scaling
• Shader Program Uniform cache: don't set uniform values if already set.
• Shader Program Uniform: don't copy, use directly arrays.
• Cull empty viewport/camera completely (no FrameBuffer binding)

Ensure Zero allocation render loop

• Intersection Visitors: add matrix stack support #107
• Double check any mem-leaks and use memory pools whenever possible
• Enhance getWorldMatrices to getWorldMatrix usage in Examples