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,
is used to assign values to the corresponding outer tesellation levels of the current patch. The values written
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.
|OpenGL Shading Language Version|
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