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dual-kawase blur algorithm for new OpenGL backend #382

Merged
merged 5 commits into from
Aug 31, 2020
Merged

dual-kawase blur algorithm for new OpenGL backend #382

merged 5 commits into from
Aug 31, 2020

Commits on Aug 31, 2020

  1. backend: gl_common: support arbitrary number of aux. blur textures/fbos 

    Support an arbitrary number of auxiliary textures and framebuffers for
blur. Preparation for the dual-filter kawase algorithm.
    @tryone144
    tryone144 committed Aug 31, 2020
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  2. Add support for new blur method dual_kawase [WIP] 

    **Work-in-Progress**

Add `dual_kawase` to configuration and argument parsing. Allow `kawase`
for backward compatibility. Add `--blur-strength` parameter for
blur-method `dual_kawase`.

Update documentation to reflect the new blur-method and parameters.
    @tryone144
    tryone144 committed Aug 31, 2020
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  3. backend: create dual_kawase blur parameters from selected strength [WIP] 

    **Work-in-Progress**

Generate suitable parameters for dual-filter kawase blur based on the
selected `blur-strength` or approximate a gauss blur with the selected
`blur-size` and std-deviation.
    @tryone144
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  4. backend: gl_common: split kernel-blur code from general init/blur cod… 

    …e [WIP]

**Work-in-Progress**

Split-off kernel-blur specific initialization and rendering from common
OpenGL setup. Add stub functions for dual_kawase-blur initialization and
rendering.
    @tryone144
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  5. backend: gl_common: implement dual-filter kawase blur method 

    Implement the dual-filter kawase blur algorithm for the new OpenGL backend
as seen in kwin [1]. Use with `--blur-method dual_kawase` and set the
desired strength with `--blur-strength level` (1-20).

The dual-filter kawase algorithm produces results close to a traditional
gaussian blur with higher performace, especially at high blur radii. The
supported strength levels provide an effect similar to gauss-radii between
4 and 500 pixels.

As this algorithm relies heavily on the texture-filtering units of a
GPU, there is no support for the xrender backend — at least for now.

[1](https://kwin.kde.narkive.com/aSqRYYw7/d9848-updated-the-blur-method-to-use-the-more-efficient-dual-kawase-blur-algorithm)
    @tryone144
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