Review Request 128426: Support OpenGL 3.2 Core profile in FadingNode shaders

[David Edmundson]

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https://git.reviewboard.kde.org/r/128426/
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Review request for KDE Frameworks and Plasma.


Repository: plasma-framework


Description
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Qt has two shaders for all items; one for when running OpenGL3.2+ without backwards compatibility (i.e running CoreProfile) and one that supports more legacy systems. (see
the shaders directory and the versions ending with _core)

core profile is only used if explicitly by the app enabled when creating the GL context. 

Something we don't currently do in Plasma, but a 3d party user could be doing.

Long term it's also something I want to do in Plasma optionally as it gives a 15Mb memory saving with Mesa.

This patch updates our material to provide the right shader for the
given version matching the behavior of
QSGShaderSourceBuilder::resolveShaderPath which Qt uses internally.


Diffs
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  src/declarativeimports/core/fadingnode.cpp 88b7310641f58c2b74fe61d2c5a97847cf7dc3b8 

Diff: https://git.reviewboard.kde.org/r/128426/diff/


Testing
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ran krunner with 
+    QSurfaceFormat format;
+    format.setVersion(3,2);
+    format.setProfile(QSurfaceFormat::CoreProfile);
+    QSurfaceFormat::setDefaultFormat(format);

and it still works.

plasmashell unchanged (so still requesting an GL 2.0 context) also still works.


Thanks,

David Edmundson

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