I waste several hours

core/assets/shaders/fog.frag

@@ -0,0 +1,12 @@
+#define HIGHP
+#define QUANT 0.3
+
+uniform sampler2D u_texture;
+
+varying vec4 v_color;
+varying vec2 v_texCoords;
+
+void main(){
+    vec4 color = texture2D(u_texture, v_texCoords.xy);
+    gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0 - floor(color.r / QUANT) * QUANT);
+}

core/src/mindustry/core/Renderer.java

@@ -37,6 +37,7 @@ public class Renderer implements ApplicationListener{
     private static final Interp landInterp = Interp.pow3;
 
     public final BlockRenderer blocks = new BlockRenderer();
+    public final FogRenderer fog = new FogRenderer();
     public final MinimapRenderer minimap = new MinimapRenderer();
     public final OverlayRenderer overlays = new OverlayRenderer();
     public final LightRenderer lights = new LightRenderer();
@@ -342,6 +343,7 @@ public class Renderer implements ApplicationListener{
         }
 
         Draw.draw(Layer.overlayUI, overlays::drawTop);
+        if(state.rules.fog) Draw.draw(Layer.fogOfWar, fog::drawFog);
         Draw.draw(Layer.space, this::drawLanding);
 
         Events.fire(Trigger.drawOver);

core/src/mindustry/game/Rules.java

@@ -113,6 +113,8 @@ public class Rules{
     public ObjectSet<String> researched = new ObjectSet<>();
     /** Block containing these items as requirements are hidden. */
     public ObjectSet<Item> hiddenBuildItems = new ObjectSet<>();
+    /** HIGHLY UNSTABLE/EXPERIMENTAL. DO NOT USE THIS. */
+    public boolean fog = false;
     /** Whether ambient lighting is enabled. */
     public boolean lighting = false;
     /** Whether enemy lighting is visible.

core/src/mindustry/graphics/FogRenderer.java

@@ -0,0 +1,173 @@
+package mindustry.graphics;
+
+import arc.*;
+import arc.graphics.*;
+import arc.graphics.Texture.*;
+import arc.graphics.g2d.*;
+import arc.graphics.gl.*;
+import arc.math.geom.*;
+import arc.struct.*;
+import arc.util.*;
+import mindustry.game.EventType.*;
+import mindustry.gen.*;
+import mindustry.io.*;
+import mindustry.io.SaveFileReader.*;
+
+import java.io.*;
+import java.nio.*;
+
+import static mindustry.Vars.*;
+
+/** Highly experimental fog-of-war renderer. */
+public class FogRenderer implements CustomChunk{
+    private static final float fogSpeed = 1f;
+    private FrameBuffer buffer = new FrameBuffer();
+    private Seq<Building> events = new Seq<>();
+    private boolean read = false;
+    private Rect rect = new Rect();
+
+    public FogRenderer(){
+        SaveVersion.addCustomChunk("fog", this);
+
+        Events.on(WorldLoadEvent.class, event -> {
+            if(state.rules.fog){
+                buffer.resize(world.width(), world.height());
+
+                events.clear();
+                Groups.build.copy(events);
+
+                //clear
+                if(!read){
+                    buffer.begin(Color.black);
+                    buffer.end();
+                }
+
+                read = false;
+            }
+        });
+
+        //draw fog when tile is placed.
+        Events.on(TileChangeEvent.class, event -> {
+            if(state.rules.fog && event.tile.build != null && event.tile.isCenter()){
+                events.add(event.tile.build);
+            }
+        });
+    }
+
+    public Texture getTexture(){
+        return buffer.getTexture();
+    }
+
+    public void drawFog(){
+        //resize if world size changes
+        buffer.resize(world.width(), world.height());
+
+        //set projection to whole map
+        Draw.proj(0, 0, buffer.getWidth() * tilesize, buffer.getHeight() * tilesize);
+        buffer.begin();
+        Gl.blendEquationSeparate(Gl.max, Gl.max);
+        ScissorStack.push(rect.set(1, 1, buffer.getWidth() - 2, buffer.getHeight() - 2));
+
+        Draw.color(Color.white);
+
+        for(var build : events){
+            if(build.team == player.team()){
+                Fill.circle(build.x, build.y, 40f);
+            }
+        }
+        events.clear();
+
+        Draw.alpha(fogSpeed * Math.max(Time.delta, 1f));
+
+        //TODO slow and terrible
+        Groups.unit.each(u -> {
+            if(u.team == player.team()){
+                Fill.circle(u.x, u.y, u.type.lightRadius);
+            }
+        });
+
+        buffer.end();
+        buffer.getTexture().setFilter(TextureFilter.linear);
+        Gl.blendEquationSeparate(Gl.funcAdd, Gl.funcAdd);
+        ScissorStack.pop();
+
+        Draw.proj(Core.camera);
+
+        Draw.shader(Shaders.fog);
+        Draw.fbo(buffer.getTexture(), world.width(), world.height(), tilesize);
+        Draw.shader();
+    }
+
+    @Override
+    public void write(DataOutput stream) throws IOException{
+        ByteBuffer bytes = Buffers.newUnsafeByteBuffer(buffer.getWidth() * buffer.getHeight() * 4);
+        try{
+            bytes.position(0);
+            buffer.begin();
+            Gl.readPixels(0, 0, buffer.getWidth(), buffer.getHeight(), Gl.rgba, Gl.unsignedByte, bytes);
+            buffer.end();
+            bytes.position(0);
+            stream.writeShort(buffer.getWidth());
+            stream.writeShort(buffer.getHeight());
+
+            //TODO flip?
+
+            int pos = 0, size = bytes.capacity() / 4;
+            while(pos < size){
+                int consecutives = 0;
+                boolean cur = bytes.get(pos * 4) != 0;
+                while(consecutives < 127 && pos < size){
+                    boolean next = bytes.get(pos * 4) != 0;
+                    if(cur != next){
+                        break;
+                    }
+
+                    consecutives ++;
+                    pos ++;
+                }
+                int mask = (cur ? 0b1000_0000 : 0);
+                stream.write(mask | (consecutives));
+            }
+        }finally{
+            Buffers.disposeUnsafeByteBuffer(bytes);
+        }
+    }
+
+    @Override
+    public void read(DataInput stream) throws IOException{
+        short w = stream.readShort(), h = stream.readShort();
+        int pos = 0;
+        int len = w * h;
+        buffer.resize(w, h);
+        buffer.begin(Color.black);
+        Draw.proj(0, 0, buffer.getWidth(), buffer.getHeight());
+        Draw.color();
+
+        while(pos < len){
+            int data = stream.readByte() & 0xff;
+            boolean sign = (data & 0b1000_0000) != 0;
+            int consec = data & 0b0111_1111;
+
+            if(sign){
+                for(int i = 0; i < consec; i++){
+                    int x = pos % w, y = pos / w;
+                    //TODO this is slow
+                    Fill.rect(x + 0.5f, y + 0.5f, 1f, 1f);
+
+                    pos ++;
+                }
+            }else{
+                pos += consec;
+            }
+        }
+
+        buffer.end();
+        Draw.proj(Core.camera);
+        read = true;
+    }
+
+    @Override
+    public boolean shouldWrite(){
+        return state.rules.fog && buffer.getTexture() != null && buffer.getWidth() > 0;
+    }
+}

core/src/mindustry/graphics/Layer.java

@@ -92,6 +92,9 @@ public class Layer{
     //names of players in the game
     playerName = 150,
 
+    //fog of war effect, if applicable
+    fogOfWar = 155,
+
     //space effects, currently only the land and launch effects
     space = 160,
 

core/src/mindustry/graphics/MinimapRenderer.java

@@ -2,6 +2,7 @@ package mindustry.graphics;
 
 import arc.*;
 import arc.graphics.*;
+import arc.graphics.Texture.*;
 import arc.graphics.g2d.*;
 import arc.math.*;
 import arc.math.geom.*;
@@ -134,6 +135,23 @@ public class MinimapRenderer{
 
         Draw.reset();
 
+        if(state.rules.fog){
+            if(withLabels){
+                float z = zoom;
+                //max zoom out fixes everything, somehow?
+                setZoom(99999f);
+                getRegion();
+                zoom = z;
+            }
+            Draw.shader(Shaders.fog);
+            renderer.fog.getTexture().setFilter(TextureFilter.nearest);
+            //crisp pixels
+            Tmp.tr1.set(renderer.fog.getTexture());
+            Tmp.tr1.set(region.u, 1f - region.v, region.u2, 1f - region.v2);
+            Draw.rect(Tmp.tr1, x + w/2f, y + h/2f, w, h);
+            Draw.shader();
+        }
+
         //TODO might be useful in the standard minimap too
         if(withLabels){
             drawSpawns(x, y, w, h, scaling);

core/src/mindustry/graphics/Shaders.java

@@ -21,6 +21,7 @@ public class Shaders{
     public static UnitBuildShader build;
     public static UnitArmorShader armor;
     public static DarknessShader darkness;
+    public static FogShader fog;
     public static LightShader light;
     public static SurfaceShader water, mud, tar, slag, cryofluid, space, caustics, arkycite;
     public static PlanetShader planet;
@@ -41,6 +42,7 @@ public class Shaders{
             shield = null;
             t.printStackTrace();
         }
+        fog = new FogShader();
         buildBeam = new BuildBeamShader();
         build = new UnitBuildShader();
         armor = new UnitArmorShader();
@@ -178,6 +180,12 @@ public class Shaders{
         }
     }
 
+    public static class FogShader extends LoadShader{
+        public FogShader(){
+            super("fog", "default");
+        }
+    }
+
     /** @deprecated transition class for mods; use UnitBuildShader instead. */
     @Deprecated
     public static class UnitBuild extends UnitBuildShader{}

core/src/mindustry/io/SaveFileReader.java

@@ -72,10 +72,11 @@ public abstract class SaveFileReader{
     "slag", "molten-slag"
     );
 
-    protected final ReusableByteOutStream byteOutput = new ReusableByteOutStream();
-    protected final DataOutputStream dataBytes = new DataOutputStream(byteOutput);
+    protected final ReusableByteOutStream byteOutput = new ReusableByteOutStream(), byteOutput2 = new ReusableByteOutStream();
+    protected final DataOutputStream dataBytes = new DataOutputStream(byteOutput), dataBytes2 = new DataOutputStream(byteOutput2);
     protected final ReusableByteOutStream byteOutputSmall = new ReusableByteOutStream();
     protected final DataOutputStream dataBytesSmall = new DataOutputStream(byteOutputSmall);
+    protected boolean chunkNested = false;
 
     protected int lastRegionLength;
     protected @Nullable CounterInputStream currCounter;
@@ -112,23 +113,41 @@ public abstract class SaveFileReader{
     }
 
     /** Write a chunk of input to the stream. An integer of some length is written first, followed by the data. */
-    public void writeChunk(DataOutput output, boolean isByte, IORunner<DataOutput> runner) throws IOException{
-        ReusableByteOutStream dout = isByte ? byteOutputSmall : byteOutput;
-        //reset output position
-        dout.reset();
-        //write the needed info
-        runner.accept(isByte ? dataBytesSmall : dataBytes);
-        int length = dout.size();
-        //write length (either int or byte) followed by the output bytes
-        if(!isByte){
-            output.writeInt(length);
-        }else{
-            if(length > 65535){
-                throw new IOException("Byte write length exceeded: " + length + " > 65535");
-            }
-            output.writeShort(length);
+    public void writeChunk(DataOutput output, boolean isShort, IORunner<DataOutput> runner) throws IOException{
+
+        //TODO awful
+        boolean wasNested = chunkNested;
+        if(!isShort){
+            chunkNested = true;
+        }
+        ReusableByteOutStream dout =
+            isShort ? byteOutputSmall :
+            wasNested ? byteOutput2 :
+            byteOutput;
+        try{
+            //reset output position
+            dout.reset();
+            //write the needed info
+            runner.accept(
+                isShort ? dataBytesSmall :
+                wasNested ? dataBytes2 :
+                dataBytes
+            );
+
+            int length = dout.size();
+            //write length (either int or byte) followed by the output bytes
+            if(!isShort){
+                output.writeInt(length);
+            }else{
+                if(length > 65535){
+                    throw new IOException("Byte write length exceeded: " + length + " > 65535");
+                }
+                output.writeShort(length);
+            }
+            output.write(dout.getBytes(), 0, length);
+        }finally{
+            chunkNested = wasNested;
         }
-        output.write(dout.getBytes(), 0, length);
     }
 
     public int readChunk(DataInput input, IORunner<DataInput> runner) throws IOException{
@@ -148,8 +167,8 @@ public abstract class SaveFileReader{
     }
 
     /** Skip a chunk completely, discarding the bytes. */
-    public void skipChunk(DataInput input, boolean isByte) throws IOException{
-        int length = readChunk(input, isByte, t -> {});
+    public void skipChunk(DataInput input, boolean isShort) throws IOException{
+        int length = readChunk(input, isShort, t -> {});
         int skipped = input.skipBytes(length);
         if(length != skipped){
             throw new IOException("Could not skip bytes. Expected length: " + length + "; Actual length: " + skipped);
@@ -180,4 +199,10 @@ public abstract class SaveFileReader{
     public interface IORunner<T>{
         void accept(T stream) throws IOException;
     }
+
+    public interface CustomChunk{
+        void write(DataOutput stream) throws IOException;
+        void read(DataInput stream) throws IOException;
+        boolean shouldWrite();
+    }
 }

core/src/mindustry/io/SaveIO.java

@@ -20,7 +20,7 @@ public class SaveIO{
     /** Save format header. */
     public static final byte[] header = {'M', 'S', 'A', 'V'};
     public static final IntMap<SaveVersion> versions = new IntMap<>();
-    public static final Seq<SaveVersion> versionArray = Seq.with(new Save1(), new Save2(), new Save3(), new Save4(), new Save5(), new Save6());
+    public static final Seq<SaveVersion> versionArray = Seq.with(new Save1(), new Save2(), new Save3(), new Save4(), new Save5(), new Save6(), new Save7());
 
     static{
         for(SaveVersion version : versionArray){

core/src/mindustry/io/SaveVersion.java

@@ -23,7 +23,9 @@ import java.util.*;
 import static mindustry.Vars.*;
 
 public abstract class SaveVersion extends SaveFileReader{
-    public int version;
+    protected static OrderedMap<String, CustomChunk> customChunks = new OrderedMap<>();
+
+    public final int version;
 
     //HACK stores the last read build of the save file, valid after read meta call
     protected int lastReadBuild;
@@ -31,6 +33,14 @@ public abstract class SaveVersion extends SaveFileReader{
     //if null, fall back to EntityMapping's values
     protected @Nullable Prov[] entityMapping;
 
+    /**
+     * Registers a custom save chunk reader/writer by name. This is mostly used for mods that need to save extra data.
+     * @param name a mod-specific, unique name for identifying this chunk. Prefixing is recommended.
+     * */
+    public static void addCustomChunk(String name, CustomChunk chunk){
+        customChunks.put(name, chunk);
+    }
+
     public SaveVersion(int version){
         this.version = version;
     }
@@ -56,23 +66,49 @@ public abstract class SaveVersion extends SaveFileReader{
     }
 
     @Override
-    public final void read(DataInputStream stream, CounterInputStream counter, WorldContext context) throws IOException{
+    public void read(DataInputStream stream, CounterInputStream counter, WorldContext context) throws IOException{
         region("meta", stream, counter, this::readMeta);
         region("content", stream, counter, this::readContentHeader);
 
         try{
             region("map", stream, counter, in -> readMap(in, context));
             region("entities", stream, counter, this::readEntities);
+            region("custom", stream, counter, this::readCustomChunks);
         }finally{
             content.setTemporaryMapper(null);
         }
     }
 
-    public final void write(DataOutputStream stream, StringMap extraTags) throws IOException{
+    public void write(DataOutputStream stream, StringMap extraTags) throws IOException{
         region("meta", stream, out -> writeMeta(out, extraTags));
         region("content", stream, this::writeContentHeader);
         region("map", stream, this::writeMap);
         region("entities", stream, this::writeEntities);
+        region("custom", stream, this::writeCustomChunks);
+    }
+
+    public void writeCustomChunks(DataOutput stream) throws IOException{
+        var chunks = customChunks.orderedKeys().select(s -> customChunks.get(s).shouldWrite());
+        stream.writeInt(chunks.size);
+        for(var chunkName : chunks){
+            var chunk = customChunks.get(chunkName);
+            stream.writeUTF(chunkName);
+
+            writeChunk(stream, false, chunk::write);
+        }
+    }
+
+    public void readCustomChunks(DataInput stream) throws IOException{
+        int amount = stream.readInt();
+        for(int i = 0; i < amount; i++){
+            String name = stream.readUTF();
+            var chunk = customChunks.get(name);
+            if(chunk != null){
+                readChunk(stream, false, chunk::read);
+            }else{
+                skipChunk(stream);
+            }
+        }
     }
 
     public void writeMeta(DataOutput stream, StringMap tags) throws IOException{

core/src/mindustry/io/versions/Save6.java

@@ -1,10 +1,31 @@
 package mindustry.io.versions;
 
+import arc.util.io.*;
 import mindustry.io.*;
+import mindustry.world.*;
 
+import java.io.*;
+
+import static mindustry.Vars.*;
+
+/** This version does not read custom chunk data. */
 public class Save6 extends SaveVersion{
 
     public Save6(){
         super(6);
     }
+
+    @Override
+    public void read(DataInputStream stream, CounterInputStream counter, WorldContext context) throws IOException{
+        region("meta", stream, counter, this::readMeta);
+        region("content", stream, counter, this::readContentHeader);
+
+        try{
+            region("map", stream, counter, in -> readMap(in, context));
+            region("entities", stream, counter, this::readEntities);
+        }finally{
+            content.setTemporaryMapper(null);
+
+        }
+    }
 }

core/src/mindustry/io/versions/Save7.java

@@ -0,0 +1,10 @@
+package mindustry.io.versions;
+
+import mindustry.io.*;
+
+public class Save7 extends SaveVersion{
+
+    public Save7(){
+        super(7);
+    }
+}

gradle.properties

@@ -24,4 +24,4 @@ android.useAndroidX=true
 #used for slow jitpack builds; TODO see if this actually works
 org.gradle.internal.http.socketTimeout=100000
 org.gradle.internal.http.connectionTimeout=100000
-archash=243eb136dc
+archash=502eb9934e