Patrick Walton
86660572bd
Upgrade ST-transforms to affine transforms where possible, and add
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incomplete rotation support to the text demo
2017-11-29 17:06:52 -08:00
Patrick Walton
58260beb8c
Only run the ECAA mask shader on edge pixels
2017-11-28 17:05:59 -08:00
Patrick Walton
6942bb51ca
Add support for full 3D transforms, including rotation, to SVG in XCAA mode.
2017-11-28 16:15:06 -08:00
Patrick Walton
6e70b983c3
Remove incorrect commented-out shader code
2017-11-21 15:54:18 -08:00
Patrick Walton
7bd3a48110
Don't clip curves to the left and right sides of the pixel column twice
2017-11-21 15:51:27 -08:00
Patrick Walton
8c1b3e9cb5
Optimize and better document the exact antialiasing calculation
2017-11-14 18:02:26 -08:00
Patrick Walton
37cdc9bc5c
Optimize the signed area calculation
2017-11-10 23:09:54 -08:00
Patrick Walton
8e7eb6ca60
Support stem darkening in SSAA mode.
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The normals are incorrect right now in some cases, but it looks OK-ish.
2017-11-09 16:20:15 -08:00
Patrick Walton
e5b76726d9
Use the LUT to gamma correct text, and fix stem darkening math
2017-11-07 17:24:19 -08:00
Patrick Walton
2604151521
Replace the multicolor (SVG) XCAA with a multipass compositing algorithm
2017-10-30 15:28:35 -07:00
Patrick Walton
e4b531f3a0
Do some work on shader documentation
2017-10-26 20:30:47 -07:00
Patrick Walton
9d93cebca6
Stop using multiple render targets.
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We don't need them anymore, so let's lower our hardware requirements!
2017-10-20 22:04:53 -07:00
Patrick Walton
048c261f6c
Add a working experimental implementation of XCAA for SVG.
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This has known performance problems and artefacts due to working at
sample level only, but it's a decent first cut.
2017-10-20 19:41:18 -07:00
Patrick Walton
314185684c
Implement stem darkening and split ECAA into ECAA and MCAA.
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We now implement stem darkening (also known as font dilation) like
macOS and FreeType under certain configurations. This pushes out font
outlines along their normals slightly in order to make small text easier
to read. This is especially important when performing gamma correction,
as otherwise text can end up too light.
Because the stem darkening is implemented in the vertex shader, it can
easily break the mesh. Therefore, I needed to implement a new rendering
mode that does not use the mesh. It's a variant of ECAA, and for
clarity's sake I've renamed the related antialiasing methods:
* MCAA stands for "mesh coverage antialiasing" and is the new name for
what was called "ECAA" prior to this patch.
* ECAA now stands for "edge coverage antialiasing". It does not use the
mesh but rather computes winding numbers from scratch for every pixel.
Surprisingly, despite being worse asymptotically, this usually ends up
being faster than MCAA at small font sizes, presumably because there are
fewer vertices to transform.
* XCAA, "exact coverage antialiasing" is a generic term that refers to
both ECAA and MCAA. References to ECAA have been changed to XCAA as
needed.
2017-10-15 13:28:49 -07:00
Patrick Walton
2a236319d4
Use regular VBOs instead of textures to store vertex positions for ECAA.
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This improves performance at small font sizes a bit by reducing vertex
shading load.
2017-10-06 16:42:51 -07:00
Patrick Walton
22d0eb7b24
Fix file headers in shaders/
2017-10-03 15:32:03 -07:00
Patrick Walton
99f6f2a104
Snap stems up to the nearest pixel when hinting
2017-09-29 18:02:33 -07:00
Patrick Walton
f68da75c75
Implement SSAA for the 3D demo.
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This commit additionally refactors transforms to be resolution-independent as much as possible throughout all the demos.
2017-09-12 19:43:43 -07:00
Patrick Walton
eb9c0ceb4d
Implement "slight" hinting by rounding x-heights up to the nearest pixel
2017-09-09 13:12:51 -07:00
Patrick Walton
3ee066bdf0
Implement subpixel ECAA
2017-09-07 14:58:41 -07:00
Patrick Walton
81a6f8f051
Enable early Z for edge detection and render only in the used area of the atlas
2017-08-23 19:18:24 -07:00
Patrick Walton
52afa359b4
Render a line of text using the atlas
2017-08-22 18:25:32 -07:00
Patrick Walton
37c947c751
Get basic ECAA fully working
2017-08-18 20:23:45 -07:00
Patrick Walton
653530be0b
Add a curve shader for ECAA and refactor the line shader to minimize code duplication
2017-08-18 17:12:58 -07:00
Patrick Walton
a9eeec39fe
Implement the line antialiasing shader, untested as of yet
2017-08-18 11:44:17 -07:00
Patrick Walton
9a7063a29b
Render conservative coverage. Not working yet.
2017-08-17 20:09:18 -07:00
Patrick Walton
0a4d57580a
Add the ECAA cover shader, untested as of yet
2017-08-16 19:51:13 -07:00
Patrick Walton
4b62ec8fa7
Get edge detection working in the demo
2017-08-16 16:37:39 -07:00
Patrick Walton
b10807d217
Initial setup for ECAA in the demo
2017-08-15 22:09:09 -07:00
Patrick Walton
3f7fc8baf6
Add an edge detection shader for ECAA, untested as of yet
2017-08-15 17:28:07 -07:00
Patrick Walton
5f89f7ba50
Fix compile errors in shaders
2017-08-13 13:39:51 -07:00
Patrick Walton
ebeaf119ba
Add some OpenGL ES 2.0 shaders for direct rendering, untested
2017-08-11 18:12:17 -07:00