Implementation of getPixels using drawTo and a cached copy.
Query the size of the procedural texture
Renderer-specific texture data.
Source version number of the texture.
Common type used by drawTo / getPixels
Request the contents of this TextureSource. Used when the target pixel memory is already allocated
Request the contents of this TextureSource. Used when a pointer is needed to existing pixel memory
Base class for TextureSource implementations where pixel data is calculated on request.