Create working lighting system

engine/src/main/java/com/bartlomiejpluta/base/engine/context/model/DefaultContext.java

@@ -13,6 +13,7 @@ import com.bartlomiejpluta.base.api.gui.GUI;
 import com.bartlomiejpluta.base.api.icon.Icon;
 import com.bartlomiejpluta.base.api.image.Image;
 import com.bartlomiejpluta.base.api.input.Input;
+import com.bartlomiejpluta.base.api.light.Light;
 import com.bartlomiejpluta.base.api.map.handler.MapHandler;
 import com.bartlomiejpluta.base.api.runner.GameRunner;
 import com.bartlomiejpluta.base.api.screen.Screen;
@@ -29,6 +30,7 @@ import com.bartlomiejpluta.base.engine.world.entity.AbstractEntity;
 import com.bartlomiejpluta.base.engine.world.icon.manager.IconManager;
 import com.bartlomiejpluta.base.engine.world.icon.manager.IconSetManager;
 import com.bartlomiejpluta.base.engine.world.image.manager.ImageManager;
+import com.bartlomiejpluta.base.engine.world.light.DefaultLight;
 import com.bartlomiejpluta.base.engine.world.map.manager.MapManager;
 import com.bartlomiejpluta.base.engine.world.map.model.DefaultGameMap;
 import com.bartlomiejpluta.base.internal.render.ShaderManager;
@@ -171,6 +173,11 @@ public class DefaultContext implements Context {
       return new AbstractEntity();
    }
 
+   @Override
+   public Light createLight() {
+      return new DefaultLight();
+   }
+
    @Override
    public Icon createIcon(@NonNull String iconSetUid, int row, int column) {
       return iconManager.createIcon(iconSetUid, row, column);

engine/src/main/java/com/bartlomiejpluta/base/engine/core/gl/render/DefaultRenderer.java

@@ -2,6 +2,8 @@ package com.bartlomiejpluta.base.engine.core.gl.render;
 
 import com.bartlomiejpluta.base.api.camera.Camera;
 import com.bartlomiejpluta.base.api.screen.Screen;
+import com.bartlomiejpluta.base.engine.core.gl.shader.constant.CounterName;
+import com.bartlomiejpluta.base.engine.core.gl.shader.constant.RenderConstants;
 import com.bartlomiejpluta.base.engine.core.gl.shader.constant.UniformName;
 import com.bartlomiejpluta.base.internal.render.Renderable;
 import com.bartlomiejpluta.base.internal.render.ShaderManager;
@@ -22,15 +24,27 @@ public class DefaultRenderer implements Renderer {
    public void init() {
       log.info("Initializing renderer");
       shaderManager
-            .createShader("default", "/shaders/default.vs", "/shaders/default.fs")
-            .selectShader("default")
-            .createUniform(UniformName.UNI_VIEW_MODEL_MATRIX)
-            .createUniform(UniformName.UNI_PROJECTION_MATRIX)
-            .createUniform(UniformName.UNI_OBJECT_COLOR)
-            .createUniform(UniformName.UNI_HAS_OBJECT_TEXTURE)
-            .createUniform(UniformName.UNI_TEXTURE_SAMPLER)
-            .createUniform(UniformName.UNI_SPRITE_SIZE)
-            .createUniform(UniformName.UNI_SPRITE_POSITION);
+         .createShader("default", "/shaders/default.vs", "/shaders/default.fs")
+         .selectShader("default")
+         .createUniform(UniformName.UNI_VIEW_MODEL_MATRIX)
+         .createUniform(UniformName.UNI_MODEL_MATRIX)
+         .createUniform(UniformName.UNI_PROJECTION_MATRIX)
+         .createUniform(UniformName.UNI_OBJECT_COLOR)
+         .createUniform(UniformName.UNI_HAS_OBJECT_TEXTURE)
+         .createUniform(UniformName.UNI_TEXTURE_SAMPLER)
+         .createUniform(UniformName.UNI_SPRITE_SIZE)
+         .createUniform(UniformName.UNI_SPRITE_POSITION)
+         .createUniform(UniformName.UNI_AMBIENT)
+         .createUniform(UniformName.UNI_ACTIVE_LIGHTS)
+         .createCounter(CounterName.LIGHT);
+
+      for(int i=0; i<RenderConstants.MAX_LIGHTS; ++i) {
+         shaderManager.createUniform(UniformName.UNI_LIGHTS + "[" + i + "].position");
+         shaderManager.createUniform(UniformName.UNI_LIGHTS + "[" + i + "].intensity");
+         shaderManager.createUniform(UniformName.UNI_LIGHTS + "[" + i + "].constantAttenuation");
+         shaderManager.createUniform(UniformName.UNI_LIGHTS + "[" + i + "].linearAttenuation");
+         shaderManager.createUniform(UniformName.UNI_LIGHTS + "[" + i + "].quadraticAttenuation");
+      }
    }
 
    @Override
@@ -39,6 +53,7 @@ public class DefaultRenderer implements Renderer {
       updateViewport(screen);
 
       shaderManager.selectShader("default").useSelectedShader();
+      shaderManager.resetCounters();
 
       // Important note:
       // The camera render method must be invoked **before** each consecutive item renders

engine/src/main/java/com/bartlomiejpluta/base/engine/core/gl/shader/constant/CounterName.java

@@ -0,0 +1,5 @@
+package com.bartlomiejpluta.base.engine.core.gl.shader.constant;
+
+public interface CounterName {
+   String LIGHT = "LIGHT";
+}

engine/src/main/java/com/bartlomiejpluta/base/engine/core/gl/shader/constant/RenderConstants.java

@@ -0,0 +1,5 @@
+package com.bartlomiejpluta.base.engine.core.gl.shader.constant;
+
+public interface RenderConstants {
+   int MAX_LIGHTS = 100;
+}

engine/src/main/java/com/bartlomiejpluta/base/engine/core/gl/shader/constant/UniformName.java

@@ -2,10 +2,14 @@ package com.bartlomiejpluta.base.engine.core.gl.shader.constant;
 
 public interface UniformName {
    String UNI_VIEW_MODEL_MATRIX = "viewModelMatrix";
+   String UNI_MODEL_MATRIX = "modelMatrix";
    String UNI_PROJECTION_MATRIX = "projectionMatrix";
    String UNI_OBJECT_COLOR = "objectColor";
    String UNI_HAS_OBJECT_TEXTURE = "hasTexture";
    String UNI_TEXTURE_SAMPLER = "sampler";
    String UNI_SPRITE_SIZE = "spriteSize";
    String UNI_SPRITE_POSITION = "spritePosition";
+   String UNI_LIGHTS = "lights";
+   String UNI_ACTIVE_LIGHTS = "activeLights";
+   String UNI_AMBIENT = "ambient";
 }

engine/src/main/java/com/bartlomiejpluta/base/engine/core/gl/shader/manager/DefaultShaderManager.java

@@ -1,6 +1,7 @@
 package com.bartlomiejpluta.base.engine.core.gl.shader.manager;
 
 import com.bartlomiejpluta.base.engine.core.gl.shader.program.GLShaderProgram;
+import com.bartlomiejpluta.base.engine.error.AppException;
 import com.bartlomiejpluta.base.engine.util.res.ResourcesManager;
 import com.bartlomiejpluta.base.internal.render.ShaderManager;
 import com.bartlomiejpluta.base.internal.render.ShaderProgram;
@@ -13,6 +14,9 @@ import org.springframework.stereotype.Component;
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static java.lang.String.format;
 
 @Slf4j
 @Component
@@ -20,6 +24,7 @@ import java.util.Map;
 public class DefaultShaderManager implements ShaderManager {
    private final ResourcesManager resourcesManager;
    private final Map<String, ShaderProgram> shaders = new HashMap<>();
+   private final Map<String, AtomicInteger> counters = new HashMap<>();
    private ShaderProgram current;
 
    @Override
@@ -142,6 +147,42 @@ public class DefaultShaderManager implements ShaderManager {
       return this;
    }
 
+   @Override
+   public ShaderManager createCounter(String counterName) {
+      if (counters.containsKey(counterName)) {
+         throw new AppException(format("The [%s] counter already exists", counterName));
+      }
+
+      log.info("Creating {} uniform counter", counterName);
+      counters.put(counterName, new AtomicInteger(0));
+      return this;
+   }
+
+   @Override
+   public int nextNumber(String counterName) {
+      return counters.get(counterName).getAndIncrement();
+   }
+
+   @Override
+   public int topNumber(String counterName) {
+      return counters.get(counterName).get();
+   }
+
+   @Override
+   public ShaderManager setUniformCounter(String uniformName, String counterName) {
+      setUniform(uniformName, counters.get(counterName).get());
+      return this;
+   }
+
+   @Override
+   public ShaderManager resetCounters() {
+      for(var counter : counters.values()) {
+         counter.set(0);
+      }
+
+      return this;
+   }
+
    @Override
    public void cleanUp() {
       log.info("Disposing shaders");

engine/src/main/java/com/bartlomiejpluta/base/engine/world/light/DefaultLight.java

@@ -0,0 +1,61 @@
+package com.bartlomiejpluta.base.engine.world.light;
+
+import com.bartlomiejpluta.base.api.camera.Camera;
+import com.bartlomiejpluta.base.api.light.Light;
+import com.bartlomiejpluta.base.api.screen.Screen;
+import com.bartlomiejpluta.base.engine.core.gl.shader.constant.CounterName;
+import com.bartlomiejpluta.base.engine.core.gl.shader.constant.UniformName;
+import com.bartlomiejpluta.base.engine.world.location.LocationableModel;
+import com.bartlomiejpluta.base.internal.render.ShaderManager;
+import lombok.Getter;
+import lombok.Setter;
+import org.joml.Vector2f;
+import org.joml.Vector3f;
+import org.joml.Vector3fc;
+
+public class DefaultLight extends LocationableModel implements Light {
+   private final Vector3f intensity = new Vector3f(1f, 1f, 1f);
+
+   @Getter
+   @Setter
+   private boolean luminescent;
+
+   @Getter
+   @Setter
+   private float constantAttenuation = 1f;
+
+   @Getter
+   @Setter
+   private float linearAttenuation = 0f;
+
+   @Getter
+   @Setter
+   private float quadraticAttenuation = 1f;
+
+   @Override
+   public Vector3fc getIntensity() {
+      return intensity;
+   }
+
+   @Override
+   public void setIntensity(float red, float green, float blue) {
+      this.intensity.x = red;
+      this.intensity.y = green;
+      this.intensity.z = blue;
+   }
+
+   @Override
+   public void update(float dt) {
+      // noop
+   }
+
+   @Override
+   public void render(Screen screen, Camera camera, ShaderManager shaderManager) {
+      var lightNumber = shaderManager.nextNumber(CounterName.LIGHT);
+      shaderManager.setUniform(UniformName.UNI_LIGHTS + "[" + lightNumber + "].position", position);
+      shaderManager.setUniform(UniformName.UNI_LIGHTS + "[" + lightNumber + "].intensity", intensity);
+      shaderManager.setUniform(UniformName.UNI_LIGHTS + "[" + lightNumber + "].constantAttenuation", constantAttenuation);
+      shaderManager.setUniform(UniformName.UNI_LIGHTS + "[" + lightNumber + "].linearAttenuation", linearAttenuation);
+      shaderManager.setUniform(UniformName.UNI_LIGHTS + "[" + lightNumber + "].quadraticAttenuation", quadraticAttenuation);
+   }
+}

engine/src/main/java/com/bartlomiejpluta/base/engine/world/map/layer/base/BaseLayer.java

@@ -3,11 +3,15 @@ package com.bartlomiejpluta.base.engine.world.map.layer.base;
 import com.bartlomiejpluta.base.api.animation.Animation;
 import com.bartlomiejpluta.base.api.camera.Camera;
 import com.bartlomiejpluta.base.api.event.Event;
+import com.bartlomiejpluta.base.api.light.Light;
 import com.bartlomiejpluta.base.api.map.layer.base.Layer;
 import com.bartlomiejpluta.base.api.map.model.GameMap;
 import com.bartlomiejpluta.base.api.screen.Screen;
+import com.bartlomiejpluta.base.engine.core.gl.shader.constant.CounterName;
+import com.bartlomiejpluta.base.engine.core.gl.shader.constant.UniformName;
 import com.bartlomiejpluta.base.internal.logic.Updatable;
 import com.bartlomiejpluta.base.internal.render.ShaderManager;
+import lombok.Getter;
 import lombok.NonNull;
 import org.joml.Vector2fc;
 
@@ -23,6 +27,9 @@ public abstract class BaseLayer implements Layer, Updatable {
 
    protected final ArrayList<Animation> animations = new ArrayList<>();
 
+   @Getter
+   protected final ArrayList<Light> lights = new ArrayList<>();
+
    public BaseLayer(@NonNull GameMap map) {
       this.map = map;
       this.stepSize = map.getStepSize();
@@ -40,6 +47,26 @@ public abstract class BaseLayer implements Layer, Updatable {
       return map;
    }
 
+   @Override
+   public void addLight(Light light) {
+      lights.add(light);
+      light.setStepSize(stepSize.x(), stepSize.y());
+   }
+
+   @Override
+   public void removeLight(Light light) {
+      // Disclaimer
+      // This is a workaround for concurrent modification exception
+      // which is thrown when entity is tried to be removed
+      // in the body of for-each-entity loop
+      lights.remove(lights.indexOf(light));
+   }
+
+   @Override
+   public void clearLights() {
+      lights.clear();
+   }
+
    @Override
    public void update(float dt) {
 
@@ -58,6 +85,11 @@ public abstract class BaseLayer implements Layer, Updatable {
             animation.onFinish(this);
          }
       }
+
+      // Disclaimer as above for lights
+      for (int i = 0; i < lights.size(); ++i) {
+         lights.get(i).update(dt);
+      }
    }
 
    @Override
@@ -65,6 +97,12 @@ public abstract class BaseLayer implements Layer, Updatable {
       for (var animation : animations) {
          animation.render(screen, camera, shaderManager);
       }
+
+      for (var light : lights) {
+         light.render(screen, camera, shaderManager);
+      }
+
+      shaderManager.setUniformCounter(UniformName.UNI_ACTIVE_LIGHTS, CounterName.LIGHT);
    }
 
    @Override

engine/src/main/java/com/bartlomiejpluta/base/engine/world/map/model/DefaultGameMap.java

@@ -12,6 +12,7 @@ import com.bartlomiejpluta.base.api.map.layer.object.PassageAbility;
 import com.bartlomiejpluta.base.api.map.layer.tile.TileLayer;
 import com.bartlomiejpluta.base.api.map.model.GameMap;
 import com.bartlomiejpluta.base.api.screen.Screen;
+import com.bartlomiejpluta.base.engine.core.gl.shader.constant.UniformName;
 import com.bartlomiejpluta.base.engine.util.mesh.MeshManager;
 import com.bartlomiejpluta.base.engine.world.autotile.model.AutoTileSet;
 import com.bartlomiejpluta.base.engine.world.map.layer.autotile.DefaultAutoTileLayer;
@@ -27,6 +28,7 @@ import lombok.Getter;
 import lombok.NonNull;
 import org.joml.Vector2f;
 import org.joml.Vector2fc;
+import org.joml.Vector3f;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -58,6 +60,9 @@ public class DefaultGameMap implements Renderable, Updatable, GameMap {
    @Getter
    private final String handler;
 
+   @Getter
+   private final Vector3f ambientColor = new Vector3f(1, 1, 1);
+
    public DefaultGameMap(int tileWidth, int tileHeight, int rows, int columns, String handler) {
       this.rows = rows;
       this.columns = columns;
@@ -77,11 +82,18 @@ public class DefaultGameMap implements Renderable, Updatable, GameMap {
 
    @Override
    public void render(Screen screen, Camera camera, ShaderManager shaderManager) {
+      shaderManager.setUniform(UniformName.UNI_AMBIENT, ambientColor);
+
       for (var layer : layers) {
          layer.render(screen, camera, shaderManager);
       }
    }
 
+   @Override
+   public Layer getLayer(int layerIndex) {
+      return layers.get(layerIndex);
+   }
+
    @Override
    public TileLayer getTileLayer(int layerIndex) {
       return (TileLayer) layers.get(layerIndex);
@@ -113,6 +125,13 @@ public class DefaultGameMap implements Renderable, Updatable, GameMap {
       }
    }
 
+   @Override
+   public void setAmbientColor(float red, float green, float blue) {
+      this.ambientColor.x = red;
+      this.ambientColor.y = green;
+      this.ambientColor.z = blue;
+   }
+
    public TileLayer createTileLayer(@NonNull TileSet tileSet) {
       var layer = new DefaultTileLayer(this, tileSet, rows, columns);
       layers.add(layer);

engine/src/main/java/com/bartlomiejpluta/base/engine/world/object/Sprite.java

@@ -38,6 +38,7 @@ public abstract class Sprite extends LocationableModel implements Renderable {
       }
 
       shaderManager.setUniform(UniformName.UNI_VIEW_MODEL_MATRIX, camera.computeViewModelMatrix(getModelMatrix()));
+      shaderManager.setUniform(UniformName.UNI_MODEL_MATRIX, getModelMatrix());
       material.render(screen, camera, shaderManager);
       mesh.render(screen, camera, shaderManager);
    }

engine/src/main/resources/shaders/default.fs

@@ -1,23 +1,39 @@
 #version 330
 
+struct Light
+{
+   vec2 position;
+   vec3 intensity;
+   float constantAttenuation;
+   float linearAttenuation;
+   float quadraticAttenuation;
+};
+
 uniform vec4 objectColor;
 uniform int hasTexture;
 uniform sampler2D sampler;
 uniform vec2 spriteSize;
 uniform vec2 spritePosition;
+uniform vec3 ambient;
+uniform Light lights[100];
+uniform int activeLights;
 
+in vec2 objectPosition;
 in vec2 fragmentTexCoord;
 
 out vec4 fragColor;
 
 void main()
 {
-   if(hasTexture == 1)
+   vec4 color = hasTexture == 1 ? objectColor * texture(sampler, fragmentTexCoord * spriteSize + spritePosition) : objectColor;
+   vec4 total = vec4(color.rgb * ambient, color.a);
+
+   for(int i=0; i<activeLights; ++i)
    {
-      fragColor = objectColor * texture(sampler, fragmentTexCoord * spriteSize + spritePosition);
-   }
-   else
-   {
-      fragColor = objectColor;
+      Light light = lights[i];
+      float dist = distance(light.position, objectPosition);
+      total.rgb += color.rgb * light.intensity.rgb / (light.constantAttenuation + light.linearAttenuation * dist + light.quadraticAttenuation * dist * dist);
    }
+
+   fragColor = total;
 }

engine/src/main/resources/shaders/default.vs

@@ -1,15 +1,18 @@
 #version 330
 
 uniform mat4 viewModelMatrix;
+uniform mat4 modelMatrix;
 uniform mat4 projectionMatrix;
 
 layout(location=0) in vec2 position;
 layout(location=1) in vec2 texCoord;
 
+out vec2 objectPosition;
 out vec2 fragmentTexCoord;
 
 void main()
 {
    gl_Position = projectionMatrix * viewModelMatrix * vec4(position, 0.0, 1.0);
+   objectPosition = (modelMatrix * vec4(position, 0.0, 1.0)).xy;
    fragmentTexCoord = texCoord;
 }