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backend: gl: add dither #952

Merged
merged 5 commits into from
Dec 3, 2022
Merged

backend: gl: add dither #952

merged 5 commits into from
Dec 3, 2022

Commits on Nov 30, 2022

  1. backend: gl: add dither 

    Add bayer ordered dithering when presenting to screen. Reduce banding
when using a strong blur. Also use 16-bit intermediary textures to
preserve precision in the rendering pipeline.

Related: #602

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
    @yshui
    yshui committed Nov 30, 2022
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  2. options: add dithered-present option 

    See also 0a2cd0f

Related: #602

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
    @yshui
    yshui committed Nov 30, 2022
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  3. backend: gl: don't add dither where it's not needed 

    If a pixel is perfectly representable as an 8-bit number, don't add
dither. Reduce artifacts where dither is unnecessary.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
    @yshui
    yshui committed Nov 30, 2022
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Commits on Dec 1, 2022

  1. backend: gl: try different back buffer formats 

    Prefer RGB formats first, because they use less memory; but fallback to
RGBA formats, as they are formats required by OpenGL.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
    @yshui
    yshui committed Dec 1, 2022
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Commits on Dec 2, 2022

  1. backend: gl: fix use-after-scope 

    'format' was pointing to an array with a shorter lifetime

suggested by @tryone144

Co-authored-by: Bernd Busse <bernd@busse-net.de>
    @yshui @tryone144
    yshui and tryone144 authored Dec 2, 2022
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