77b3555828
Separate opacity out from paint.
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This allows `globalAlpha` to work on render targets.
2020-02-26 12:43:07 -08:00
5421525eaa
Implement the HSL filters (called "non-separable blend modes" in the spec).
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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
0883f54e2d
Add a separate mask blit step, in preparation for supporting clips.
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We can elide this in the future if there are no clips, but it isn't a huge
performance regression right now, so let's just unconditionally do it.
2020-02-14 21:56:43 -08:00
5a21557a6d
Implement basic linear gradients.
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This is not a very efficient implementation yet, but it seems to work.
2020-02-10 16:01:05 -08:00
a66ed4c073
Specify tile texture coordinates as an affine transform.
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Part of the groundwork for gradients.
2020-02-05 13:59:32 -08:00
b269723254
Switch to per-pixel texture lookup for paints.
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This is a prerequisite for supporting gradients and images.
2020-02-04 21:50:13 -08:00
Patrick Walton