shader: use array indices when reading from gl_TessLevel*
gl_tessLevelOuter and gl_TessLevelInner don't support swizzles, but must be accessed as arrays.
Closes: #230 (closed)
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
gl_tessLevelOuter and gl_TessLevelInner don't support swizzles, but must be accessed as arrays.
Closes: #230 (closed)