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@@ -195,3 +195,23 @@ For a complete list of built-in GLSL functions see the :ref:`Shading Language do
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+------------------------------------------------------------------------+--------------------------------------------------+
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+------------------------------------------------------------------------+--------------------------------------------------+
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| vec_type **fwidth** ( vec_type ) | |
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| vec_type **fwidth** ( vec_type ) | |
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+------------------------------------------------------------------------+--------------------------------------------------+
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+------------------------------------------------------------------------+--------------------------------------------------+
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+
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+Godot also provides many built-in variables and render modes. Some cannot be supported in GLES2. Below is a list of
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+built-in variables and render modes that, when written to, will have no effect or could even cause issues when using
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+the GLES2 backend.
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+
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++----------------------------+
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+| Variable / Render Mode |
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++============================+
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+| ``ensure_correct_normals`` |
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++----------------------------+
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+| ``INSTANCE_ID`` |
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++----------------------------+
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+| ``DEPTH`` |
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++----------------------------+
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+| ``ANISOTROPY`` |
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++----------------------------+
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+| ``ANISOTROPY_FLOW`` |
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++----------------------------+
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+| ``SSS_STRENGTH`` |
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++----------------------------+
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