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.
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OpenGL Shading Language Version
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| 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
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| gl_PatchVerticesIn | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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gl_TessLevelOuter(), gl_TessLevelInner(), gl_TessCoord()
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