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Isoline tessellation does not match OpenGL 4.1 spec

Question asked by reidm on Jun 12, 2013
Latest reply on Jun 12, 2013 by reidm

On my Radeon HD 7770 with 13.4 drivers I get the following behavior with isoline tessellation:

 

gl_TessLevelOuter[0] = stripCount

gl_TessLevelOuter[1] = segmentCount

 

This does not match the OpenGL 4.1 specification which states:

 

The number of segments in each strip is derived from the first outer tessellation level; the number of line strips drawn is derived from the second outer tessellation level.

 

I also tested 12.4 drivers, and behavior in this case matches the specification.

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