Add support for 4.2 (#131)

* Add support for 4.2

README.md

@@ -38,9 +38,7 @@ I'm gonna be happy to accept PR for new features if it fits.
 
 ## Godot 4.2 and lower (4.x)
 
-Starting with Godot 4.3, a breaking change has been introduced in the engine (see [this post from the Godot Team](https://godotengine.org/article/introducing-reverse-z/)). This forces TerraBrush to adapt to the new requirements.
-
-This breaking change impacts the water shader used in the plugin. If you are still using a version before Godot 4.3, you should stick to a version of TerraBrush before 0.8.0-alpha.
+The demo scene has been updated to Godot 4.3 which makes it break with older version of Godot.
 
 ## Key Features
 

addons/terrabrush/Resources/Shaders/water_clipmap_shader_include.gdshaderinc

@@ -24,16 +24,19 @@ uniform float EdgeScale = 0.1;
 uniform float Near = 0.5;
 uniform float Far = 100.0;
 uniform vec3 EdgeColor: source_color;
+uniform bool InvertedZ = true;
 
 float fresnel(float amount, vec3 normal, vec3 view) {
 	return pow((1.0 - clamp(dot(normalize(normal), normalize(view)), 0.0, 1.0)), amount);
 }
 
 float edge(float depth) {
-    // Invert the depth value
-    depth = 1.0 - depth;
-    depth = 2.0 * depth - 1.0;
-    return Near * Far / (Far + depth * (Near - Far));	
+	// Invert the depth value
+	if (InvertedZ) {
+		depth = 1.0 - depth;		
+	}
+	depth = 2.0 * depth - 1.0;
+	return Near * Far / (Far + depth * (Near - Far));	
 }
 
 void calculateWaterVertex(

addons/terrabrush/Scripts/StringNames.cs

@@ -66,4 +66,5 @@ internal static class StringNames {
     public static readonly StringName UseBrushScale = "UseBrushScale";
     public static readonly StringName ScaleNoiseTexture = "ScaleNoiseTexture";
     public static readonly StringName RandomPlacementRange = "RandomPlacementRange";
+    public static readonly StringName InvertedZ = "InvertedZ";
 }

addons/terrabrush/Scripts/Water.cs

@@ -135,6 +135,14 @@ public void UpdateWater() {
         _clipmap.Shader.SetShaderParameter(StringNames.Near, Near);
         _clipmap.Shader.SetShaderParameter(StringNames.Far, Far);
         _clipmap.Shader.SetShaderParameter(StringNames.EdgeColor, EdgeColor);
+
+        // This is for compatibility with Godot 4.2
+        var engineVersion = Engine.GetVersionInfo();
+        var major = (int) engineVersion["major"];
+        var minor = (int) engineVersion["minor"];
+        if (major == 4 && minor < 3) {
+            _clipmap.Shader.SetShaderParameter(StringNames.InvertedZ, false);
+        }
     }
 
     public void AddRippleEffect(float x, float y) {

addons/terrabrush/plugin.cfg

@@ -3,5 +3,5 @@
 name="TerraBrush"
 description=""
 author="spimort"
-version="0.8.1-alpha"
+version="0.8.2-alpha"
 script="Plugin.cs"