gl_TessLevelOuter - contains the outer tessellation levels for the current patch
// In tessellation control shaders
out float gl_TessLevelOuter ;
// In tessellation evaluation shaders
in float gl_TessLevelOuter ;
Available only in the tessellation control and evaluation languages,
gl_TessLevelOuter is used to assign values to the corresponding outer
tesellation levels of the current patch. The values written into
gl_TessLevelOuter by the tessellation control shader are used by the
tessellation primitive generator to control primitive tessellation and may be
read by the subsequent tessellation evaluation shader.
As inputs to the tessellation evaluation shader,
gl_TessLevelOuter contains the values written by the tessellation
control shader, if present. If no tessellation control shader is present, it
contains the default tessellation level.
Copyright © 2011-2014 Khronos Group. This material may be distributed
subject to the terms and conditions set forth in the Open Publication License,
v 1.0, 8 June 1999. http://opencontent.org/openpub/.
Copyright © 2011-2014 Khronos Group
|OpenGL Shading Language