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Region/GLRegion, ..
GLSL fix:
- allowing #version tag
- add uniform textureSize (ES2)
- fix int/float conversion
Region/GLRegion:
- non OpenGL Region and GL related GLRegion split
Region/Renderer renderModes bits (def. in Region)
- user creates a Renderer* impl .. and derive Region*'s from outline,
possibly from a different code path.
- to avoid mode explosion, a bit field is being used for now
- Renderer: remove flushCache(), since non caching impl. is intended,
or caching by an external user transparent object.
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