Merge pull request #51821 from Calinou/builtin-shaders-add-comments

Add comments at the top of each built-in shader to ease debugging

editor/plugins/texture_3d_editor_plugin.cpp

@@ -76,6 +76,8 @@ void Texture3DEditor::_update_material() {
 void Texture3DEditor::_make_shaders() {
 	shader.instantiate();
 	shader->set_code(R"(
+// Texture3DEditor preview shader.
+
 shader_type canvas_item;
 
 uniform sampler3D tex;