[gtk] (16 commits) Created branch wip/baedert/gl-rework

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/gl-rework' was created.

Summary of new commits:

  4fc8e60... gl renderer: Remove some unused uniforms
  b378319... gl renderer: Split blurring a node into its own function
  904d4e1... progressbar: Remove unnecessary snapshot implementation
  1eb44b3... GdkRGBA: Use floats instead of doubles
  10016f8... gl renderer: remove a memory leak
  42f3a43... gl renderer: stop copying current color around
  f60731a... gl renderer: Don't copy border outline corner sizes around
  e4f9c9c...   gl renderer: Rewort passing rounded rects to shaders
  b76ee75... gl renderer: Fix debug color output
  e12006d... gl renderer: Shorten debug output impl
  402a83c... gl renderer: Fix color comparison
  48c70a7... gl renderer: Only send clip corners if we need to
  b2759b3... gl renderer: Fix program uniform updating code
  4de831b... gl renderer: Rewrite shader builder
  d93e5eb... gl renderer: Make RoundedRect work in gles
  b01c68f... gl renderer: Initialize alpha uniform to 1.0