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4 Commits

Author SHA1 Message Date
Patrick Walton 77b3555828 Separate opacity out from paint. 
This allows `globalAlpha` to work on render targets.
 2020-02-26 12:43:07 -08:00
Patrick Walton 00b7a2ee5a Factor out 3-element selection into a `select3()` function 2020-02-24 21:21:30 -08:00
Patrick Walton c96cb62f47 Factor out common functions used in tile alpha shaders 2020-02-24 19:42:32 -08:00
Patrick Walton 5421525eaa Implement the HSL filters (called "non-separable blend modes" in the spec). 
These cannot be implemented with the standard OpenGL blending functions, so we
have to do them manually in a shader, which requires a good deal of machinery
to create intermediate framebuffers and so forth.
 2020-02-24 15:37:44 -08:00