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opengl: sampler: fix swizzle components

Alexandre Janniaux requested to merge alexandre-janniaux/vlc:fix-swizzle-opengl/1 into master

The GLSL allows three different swizzling:

  • .rgba
  • .stuv
  • .xyzw

However, they are not allowed to be mixed together:

    ERROR: 0:8: Inconsistent component characters in swizzle 'xa'
    ERROR: 0:10: Use of undeclared identifier 'pixel'
    ERROR: 0:11: Use of undeclared identifier 'result'

Fix the swizzling to w instead of a.

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