Allows usage of uniforms when rendering display-objects in batches. It expects you to aggregate each display-object's uniforms in an array and that the shader will pick the appropriate uniform at runtime (an index into the uniforms array will be passed).

Usage in shader:

// Your display-objects' affine transforms are aggregated into this array.
uniform mat3d affineTransform[];

// For WebGL1+ machines, your uniforms may be fetched by the uniform-ID attrib (float).
varying float vUniformID;

// For WebGL-2 only, to prevent interpolation overhead, you may use the flat in variables. You
// can configure this in AggregateUniformShaderFactory.
flat in int uniformID;

No Aggregation Mode

Aggregating uniforms into arrays requries a uniform-ID attribute to be uploaded as well. This may cost a lot of memory if your uniforms don't really change a lot. For these cases, you can disable uniform aggregation by not passing a uniformIDAttrib. This will make batches only have one value for each uniform. The uniforms will still be uploaded as 1-element arrays, however.