Fix shader parameters not displaying the right value until set for th…

…e first time

CHANGELOG.md

@@ -16,6 +16,7 @@ For a more detailed list of past and incoming changes, see the commit history.
 - Exposed specular parameter in ground shaders
 - Fixed brush cursor looked off-center at close range when using tiny brush sizes
 - Fixed error when trying to change `TextureSet` mode while it has textures in it
+- Fixed shader parameters not displaying the right value in the inspector until they are set by the user at least once
 
 
 1.7.2

addons/zylann.hterrain/hterrain.gd

@@ -540,7 +540,7 @@ func _on_texture_set_changed():
 
 
 func get_shader_param(param_name: String):
-	return _material.get_shader_parameter(param_name)
+	return HT_Util.get_shader_material_parameter(_material, param_name)
 
 
 func set_shader_param(param_name: String, v):

addons/zylann.hterrain/hterrain_detail_layer.gd

@@ -280,7 +280,7 @@ func _set(key: StringName, v):
 
 
 func get_shader_param(param_name: String):
-	return _material.get_shader_parameter(param_name)
+	return HT_Util.get_shader_material_parameter(_material, param_name)
 
 
 func set_shader_param(param_name: String, v):

addons/zylann.hterrain/util/util.gd

@@ -547,3 +547,16 @@ static func update_texture_partial(
 	fuck.blit_rect(im, src_rect, dst_pos)
 	tex.update(fuck)
 
+
+# Should be used because if `set_shader_parameter` has never been called, `get_shader_parameter` 
+# will return null even if the shader's corresponding uniform has a default value.
+# See https://github.com/godotengine/godot/issues/44454
+static func get_shader_material_parameter(material: ShaderMaterial, param_name: StringName):
+	var v = material.get_shader_parameter(param_name)
+	if v == null:
+		var shader : Shader = material.shader
+		if shader != null:
+			v = RenderingServer.shader_get_parameter_default(shader.get_rid(), param_name)
+	return v
+
+