Experimenting with light

core/src/io/anuke/mindustry/graphics/LightRenderer.java

@@ -0,0 +1,47 @@
+package io.anuke.mindustry.graphics;
+
+import io.anuke.arc.*;
+import io.anuke.arc.collection.*;
+import io.anuke.arc.graphics.*;
+import io.anuke.arc.graphics.g2d.*;
+import io.anuke.arc.graphics.glutils.*;
+
+public class LightRenderer{
+    private static final int scaling = 4;
+    private FrameBuffer buffer = new FrameBuffer(2, 2);
+    private Array<Runnable> lights = new Array<>();
+
+    public void add(Runnable run){
+        lights.add(run);
+    }
+
+    public void add(float x, float y, float radius, Color color, float opacity){
+        add(() -> {
+            Draw.color(color, opacity);
+            Draw.rect("circle-shadow", x, y, radius * 2, radius * 2);
+        });
+    }
+
+    public void draw(){
+        if(buffer.getWidth() != Core.graphics.getWidth()/scaling || buffer.getHeight() != Core.graphics.getHeight()/scaling){
+            buffer.resize(Core.graphics.getWidth()/scaling, Core.graphics.getHeight()/scaling);
+        }
+
+        Draw.color();
+        buffer.beginDraw(Color.clear);
+        Draw.blend(Blending.additive);
+        for(Runnable run : lights){
+            run.run();
+        }
+        Draw.reset();
+        Draw.blend();
+        buffer.endDraw();
+
+        Draw.color();
+        Draw.shader(Shaders.light);
+        Draw.rect(Draw.wrap(buffer.getTexture()), Core.camera.position.x, Core.camera.position.y, Core.camera.width, -Core.camera.height);
+        Draw.shader();
+
+        lights.clear();
+    }
+}

core/src/io/anuke/mindustry/graphics/Shaders.java

@@ -15,6 +15,7 @@ public class Shaders{
     public static UnitBuild build;
     public static FogShader fog;
     public static MenuShader menu;
+    public static LightShader light;
     public static SurfaceShader water, tar;
 
     public static void init(){
@@ -30,10 +31,25 @@ public class Shaders{
         build = new UnitBuild();
         fog = new FogShader();
         menu = new MenuShader();
+        light = new LightShader();
         water = new SurfaceShader("water");
         tar = new SurfaceShader("tar");
     }
 
+    public static class LightShader extends LoadShader{
+        public Color ambient = new Color(0.01f, 0.01f, 0.04f, 0.99f);
+
+        public LightShader(){
+            super("light", "default");
+        }
+
+        @Override
+        public void apply(){
+            setUniformf("u_ambient", ambient);
+        }
+
+    }
+
     public static class MenuShader extends LoadShader{
         float time = 0f;