tschw / ol3 Goto Github PK

Right now all data preparation is in batchbuilder.js and there is one common shader for both lines and polygons.
It is desirable to have the code structured by the geometry that it implements using separat,e simplified shaders. It's getting rather crowded in batchbuilder.js (> 1000 LOC - unpleasant to edit, already) and we'd otherwise add even more code to it. Common subroutines should be factored out and be clearly identifiable as such.

Right now, wide lines can be shaded with an outline immediately before smoothing. It won't be used, so remove it to improve clarity.

Add a geometric primitive feeding 4 redundant coordinates + control to the vertex shader.
Styling controls

• scale,
• rotation (absolute or relative),
• actual size, anchor point, and
• opacity.

Vertex element indices are limited to 16 bit unsigned integers in WebGL. To overcome this limit, issue a CONFIGURE instruction to the control stream to rebind the vertex buffer with the offset of the first vertex in the last primitive and subtract the number of skipped vertices from the index range.