Merge pull request #6031 from Calinou/shading-language-hint-default-transparent

Add `hint_default_transparent` to Shading language

tutorials/shaders/shader_reference/shading_language.rst

@@ -752,29 +752,33 @@ engine renders in linear color space.
 
 Full list of hints below:
 
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| Type                 | Hint                                           | Description                                          |
-+======================+================================================+======================================================+
-| **vec3, vec4**       | source_color                                   | Used as color.                                       |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **int, float**       | hint_range(min, max[, step])                   | Restricted to values in a range (with min/max/step). |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | source_color                                   | Used as albedo color.                                |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | hint_normal                                    | Used as normalmap.                                   |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | hint_default_white                             | As value or albedo color, default to white.          |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | hint_default_black                             | As value or albedo color, default to black.          |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | hint_anisotropy                                | As flowmap, default to right.                        |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | hint_roughness[_r, _g, _b, _a, _normal, _gray] |                                                      |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | filter[_nearest, _linear][_mipmap][_aniso]     | Enabled specified texture filtering.                 |
-+----------------------+------------------------------------------------+------------------------------------------------------+
-| **sampler2D**        | repeat[_enable, _disable]                      | Enabled texture repeating.                           |
-+----------------------+------------------------------------------------+------------------------------------------------------+
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| Type                 | Hint                                           | Description                                                                 |
++======================+================================================+=============================================================================+
+| **vec3, vec4**       | source_color                                   | Used as color.                                                              |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **int, float**       | hint_range(min, max[, step])                   | Restricted to values in a range (with min/max/step).                        |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | source_color                                   | Used as albedo color.                                                       |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | hint_normal                                    | Used as normalmap.                                                          |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | hint_default_white                             | As value or albedo color, default to opaque white.                          |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | hint_default_black                             | As value or albedo color, default to opaque black.                          |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | hint_default_transparent                       | As value or albedo color, default to transparent black.                     |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | hint_anisotropy                                | As flowmap, default to right.                                               |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | hint_roughness[_r, _g, _b, _a, _normal, _gray] | Used for roughness limiter on import (attempts reducing specular aliasing). |
+|                      |                                                | ``_normal`` is a normal map that guides the roughness limiter,              |
+|                      |                                                | with roughness increasing in areas that have high-frequency detail.         |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | filter[_nearest, _linear][_mipmap][_aniso]     | Enabled specified texture filtering.                                        |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
+| **sampler2D**        | repeat[_enable, _disable]                      | Enabled texture repeating.                                                  |
++----------------------+------------------------------------------------+-----------------------------------------------------------------------------+
 
 GDScript uses different variable types than GLSL does, so when passing variables
 from GDScript to shaders, Godot converts the type automatically. Below is a