Support symbol marks with multiple shapes #18
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Adds support for symbol marks with multiple shapes.
To do this while preserving instancing, this PR merges the geometric and circle symbol vertex shaders. The vertices for all of the symbols that are used are sent to the vertex shader. The instance struct includes the index of the shape that should be used for that instance. The fragments associated with all other vertices are discarded.
Here's an example of a single symbol marks with 3 shapes, rendered by this PR: