Available only in the tessellation cevaluation language, gl_TessCoord specifies the three component (u, v, w) vector identifying the position of the vertex being processed by the shader relative to the primitive being tessellated.
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OpenGL Shading Language Version
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| Function 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_TessCoord | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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gl_TessLevelOuter(), gl_TessLevelInner(), gl_PatchVerticesIn()
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