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Replace text about migrating preprocessor directives with a short list of supported macros #7007

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Jun 2, 2023
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Replace text about migrating preprocessor directives with a short list of supported macros #7007

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12 changes: 5 additions & 7 deletions tutorials/shaders/converting_glsl_to_godot_shaders.rst
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Expand Up @@ -74,13 +74,11 @@ rename ``main`` to ``fragment``.
Macros
^^^^^^

In keeping with its similarity to C, GLSL lets you use macros. Commonly
``#define`` is used to define constants or small functions. There is no
straightforward way to translate defines to Godot's shading language. If it is a
function that is defined, then replace with a function, and if it is a constant,
then replace with a uniform. For other macros (``#if``, ``#ifdef``, etc.), there
is no equivalent because they run during the pre-processing stage of
compilation.
The :ref:`Godot shader preprocessor<doc_shader_preprocessor>` supports the following macros:
* ``#define`` / ``#undef``
* ``#if``, ``#elif``, ``#else``, ``#endif``, ``defined()``, ``#ifdef``, ``#ifndef``
* ``#include`` (only ``.gdshaderinc`` files and with a maximum depth of 25)
* ``#pragma disable_preprocessor``, which disables preprocessing for the rest of the file

Variables
^^^^^^^^^
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