gl_PatchVerticesIn(3) contains the number of vertices in the current patch


in int gl_PatchVerticesIn ;.SH "DESCRIPTION"

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
Variable Name 1.10 1.20 1.30 1.40 1.50 3.30 4.00 4.10 4.20 4.30 4.40 4.50
gl_PatchVerticesIn - - - - - -


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