making dithering work on skybox drawing

src/net/torvald/terrarum/AppLoader.java

@@ -392,7 +392,7 @@ public class AppLoader implements ApplicationListener {
         // set GL graphics constants
         shaderBayerSkyboxFill = loadShader("assets/4096.vert", "assets/4096_bayer_skyboxfill.frag");
         shaderHicolour = loadShader("assets/4096.vert", "assets/hicolour.frag");
-        shaderPassthruRGB = loadShader("assets/4096.vert", "assets/passthrurgb.frag");
+        shaderPassthruRGB = SpriteBatch.createDefaultShader();
         shaderColLUT = loadShader("assets/4096.vert", "assets/passthrurgb.frag");
         shaderReflect = loadShader("assets/4096.vert", "assets/reflect.frag");
 

src/net/torvald/terrarum/DefaultConfig.kt

@@ -103,6 +103,7 @@ object DefaultConfig {
 
 
         // "fancy" graphics settings
+        jsonObject.addProperty("fxdither", true)
         jsonObject.addProperty("fxretro", false)
         //jsonObject.addProperty("fx3dlut", false)
 

src/net/torvald/terrarum/modulebasegame/weather/WeatherMixer.kt

@@ -173,7 +173,15 @@ internal object WeatherMixer : RNGConsumer {
         skyboxTexture.dispose()
         skyboxTexture = Texture(skyboxPixmap); skyboxTexture.setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear)
 
-        batch.shader = IngameRenderer.shaderBayer
+        if (AppLoader.getConfigBoolean("fxdither")) {
+            batch.shader = IngameRenderer.shaderBayer
+            batch.shader.setUniformf("rcount", 64f)
+            batch.shader.setUniformf("gcount", 64f)
+            batch.shader.setUniformf("bcount", 64f)
+        }
+        else {
+            batch.shader = null
+        }
         batch.inUse {
             it.draw(skyboxTexture, 0f, -AppLoader.halfScreenHf, AppLoader.screenWf, AppLoader.screenHf * 2f) // because of how the linear filter works, we extend the image by two
         }