implement layer-by-layer rendering (squashed) #1886
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This makes rendering more similar to -native. All layers are drawn in two passes: opaque and then transparent. Tile clip ids are drawn to the stencil at the same time to allow for fast switching between tiles. The depth buffer is used to drop fragments below opaque fills. fixes #757 Unlike -native, only the last 5 bits of the stencil buffer are used for storing clip ids. The first 3 bits are still used for rendering polygons.
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This is a squashed and rebased version of #1727
This makes rendering more similar to -native.
All layers are drawn in two passes: opaque and then transparent. Tile
clip ids are drawn to the stencil at the same time to allow for fast
switching between tiles. The depth buffer is used to drop fragments
below opaque fills.
fixes #757
Unlike -native, only the last 5 bits of the stencil buffer are used for
storing clip ids. The first 3 bits are still used for rendering
polygons.