gl_PatchVerticesIn.3G man page
gl_PatchVerticesIn — 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|
gl_TessLevelOuter(), gl_TessLevelInner(), gl_TessCoord()
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Copyright © 2011-2014 Khronos Group