gl_PatchVerticesIn — contains the number of vertices in the current patch
in int gl_PatchVerticesIn ;
Available only in the tessellation control and evaluation languages,
gl_PatchVerticesIn contains the number of vertices in the input being processed by the shader. A single tessellation control or evaluation shader can read patches of differing sizes, and so th value of
gl_PatchVertexIn may differ between patches.
|OpenGL Shading Language Version|
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