Create working GUI scaffolding

api/src/main/java/com/bartlomiejpluta/base/api/game/context/Context.java

@@ -2,6 +2,7 @@ package com.bartlomiejpluta.base.api.game.context;
 
 import com.bartlomiejpluta.base.api.game.camera.Camera;
 import com.bartlomiejpluta.base.api.game.entity.Entity;
+import com.bartlomiejpluta.base.api.game.gui.GUI;
 import com.bartlomiejpluta.base.api.game.image.Image;
 import com.bartlomiejpluta.base.api.game.screen.Screen;
 
@@ -15,4 +16,6 @@ public interface Context {
    Entity createEntity(String entitySetUid);
 
    Image getImage(String imageUid);
+
+   GUI newGUI();
 }

api/src/main/java/com/bartlomiejpluta/base/api/game/gui/Color.java

@@ -0,0 +1,23 @@
+package com.bartlomiejpluta.base.api.game.gui;
+
+public interface Color {
+   float getRed();
+
+   float getGreen();
+
+   float getBlue();
+
+   float getAlpha();
+
+   void setRed(float value);
+
+   void setGreen(float value);
+
+   void setBlue(float value);
+
+   void setAlpha(float value);
+
+   void setColor(float red, float green, float blue);
+
+   void setColor(float red, float green, float blue, float alpha);
+}

api/src/main/java/com/bartlomiejpluta/base/api/game/gui/GUI.java

@@ -1,7 +1,16 @@
 package com.bartlomiejpluta.base.api.game.gui;
 
-import com.bartlomiejpluta.base.api.internal.logic.Updatable;
+import com.bartlomiejpluta.base.api.internal.gc.Disposable;
 import com.bartlomiejpluta.base.api.internal.render.Renderable;
 
-public interface GUI extends Updatable, Renderable {
+public interface GUI extends Renderable, Disposable {
+   Widget getRoot();
+
+   void setRoot(Widget root);
+
+   void drawRectangle(float x, float y, float w, float h);
+
+   void fillColor(Color color);
+
+   Color createColor(float red, float green, float blue, float alpha);
 }

api/src/main/java/com/bartlomiejpluta/base/api/game/gui/Widget.java

@@ -0,0 +1,9 @@
+package com.bartlomiejpluta.base.api.game.gui;
+
+import com.bartlomiejpluta.base.api.game.screen.Screen;
+
+public interface Widget {
+   Widget getParent();
+
+   void draw(Screen screen, GUI gui);
+}

api/src/main/java/com/bartlomiejpluta/base/api/game/screen/Screen.java

@@ -23,4 +23,6 @@ public interface Screen {
    void update();
 
    void clear(float r, float g, float b, float alpha);
+
+   void restoreState();
 }

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

@@ -48,6 +48,8 @@ public class DefaultRenderer implements Renderer {
       renderable.render(screen, camera, shaderManager);
 
       shaderManager.detachCurrentShader();
+
+      screen.restoreState();
    }
 
    private void clear() {

engine/src/main/java/com/bartlomiejpluta/base/engine/gui/asset/FontAsset.java

@@ -1,4 +1,4 @@
-package com.bartlomiejpluta.base.engine.gui.font.asset;
+package com.bartlomiejpluta.base.engine.gui.asset;
 
 import com.bartlomiejpluta.base.engine.common.asset.Asset;
 import lombok.NonNull;

engine/src/main/java/com/bartlomiejpluta/base/engine/gui/manager/DefaultFontManager.java

@@ -1,6 +1,6 @@
-package com.bartlomiejpluta.base.engine.gui.font.manager;
+package com.bartlomiejpluta.base.engine.gui.manager;
 
-import com.bartlomiejpluta.base.engine.gui.font.asset.FontAsset;
+import com.bartlomiejpluta.base.engine.gui.asset.FontAsset;
 import com.bartlomiejpluta.base.engine.world.tileset.asset.TileSetAsset;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Component;

engine/src/main/java/com/bartlomiejpluta/base/engine/gui/manager/FontManager.java

@@ -1,7 +1,7 @@
-package com.bartlomiejpluta.base.engine.gui.font.manager;
+package com.bartlomiejpluta.base.engine.gui.manager;
 
 import com.bartlomiejpluta.base.engine.common.manager.AssetManager;
-import com.bartlomiejpluta.base.engine.gui.font.asset.FontAsset;
+import com.bartlomiejpluta.base.engine.gui.asset.FontAsset;
 
 public interface FontManager extends AssetManager<FontAsset, Integer> {
 }

engine/src/main/java/com/bartlomiejpluta/base/engine/gui/render/NanoVGColorAdapter.java

@@ -0,0 +1,78 @@
+package com.bartlomiejpluta.base.engine.gui.render;
+
+import com.bartlomiejpluta.base.api.game.gui.Color;
+import com.bartlomiejpluta.base.api.internal.gc.Disposable;
+import org.lwjgl.BufferUtils;
+import org.lwjgl.nanovg.NVGColor;
+
+public class NanoVGColorAdapter extends NVGColor implements Color, Disposable {
+
+   public NanoVGColorAdapter(float red, float green, float blue, float alpha) {
+      super(BufferUtils.createByteBuffer(SIZEOF));
+
+      r(red);
+      g(green);
+      b(blue);
+      a(alpha);
+   }
+
+   @Override
+   public float getRed() {
+      return r();
+   }
+
+   @Override
+   public float getGreen() {
+      return g();
+   }
+
+   @Override
+   public float getBlue() {
+      return b();
+   }
+
+   @Override
+   public float getAlpha() {
+      return a();
+   }
+
+   @Override
+   public void setRed(float value) {
+      r(value);
+   }
+
+   @Override
+   public void setGreen(float value) {
+      g(value);
+   }
+
+   @Override
+   public void setBlue(float value) {
+      b(value);
+   }
+
+   @Override
+   public void setAlpha(float value) {
+      a(value);
+   }
+
+   @Override
+   public void setColor(float red, float green, float blue) {
+      r(red);
+      g(green);
+      b(blue);
+   }
+
+   @Override
+   public void setColor(float red, float green, float blue, float alpha) {
+      r(red);
+      g(green);
+      b(blue);
+      a(alpha);
+   }
+
+   @Override
+   public void dispose() {
+      free();
+   }
+}

engine/src/main/java/com/bartlomiejpluta/base/engine/gui/render/NanoVGGUI.java

@@ -0,0 +1,70 @@
+package com.bartlomiejpluta.base.engine.gui.render;
+
+import com.bartlomiejpluta.base.api.game.camera.Camera;
+import com.bartlomiejpluta.base.api.game.gui.Color;
+import com.bartlomiejpluta.base.api.game.gui.GUI;
+import com.bartlomiejpluta.base.api.game.gui.Widget;
+import com.bartlomiejpluta.base.api.game.screen.Screen;
+import com.bartlomiejpluta.base.api.internal.render.ShaderManager;
+import com.bartlomiejpluta.base.engine.error.AppException;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import static org.lwjgl.nanovg.NanoVG.*;
+import static org.lwjgl.nanovg.NanoVGGL3.*;
+import static org.lwjgl.system.MemoryUtil.NULL;
+
+@Getter
+public class NanoVGGUI implements GUI {
+   private long context;
+
+   @Setter
+   private Widget root;
+
+   private final List<NanoVGColorAdapter> createdColors = new LinkedList<>();
+
+   public void init(Screen screen) {
+      context = nvgCreate(NVG_ANTIALIAS | NVG_STENCIL_STROKES);
+
+      if (context == NULL) {
+         throw new AppException("Could not onCreate NanoVG");
+      }
+   }
+
+   @Override
+   public void render(Screen screen, Camera camera, ShaderManager shaderManager) {
+      nvgBeginFrame(context, screen.getWidth(), screen.getHeight(), 1);
+
+      if (root != null) {
+         root.draw(screen, this);
+      }
+
+      nvgEndFrame(context);
+   }
+
+   @Override
+   public void drawRectangle(float x, float y, float w, float h) {
+      nvgRect(context, x, y, w, h);
+   }
+
+   @Override
+   public void fillColor(Color color) {
+      nvgFillColor(context, (NanoVGColorAdapter) color);
+      nvgFill(context);
+   }
+
+   @Override
+   public Color createColor(float red, float green, float blue, float alpha) {
+      var color = new NanoVGColorAdapter(red, green, blue, alpha);
+      createdColors.add(color);
+      return color;
+   }
+
+   @Override
+   public void dispose() {
+      createdColors.forEach(NanoVGColorAdapter::dispose);
+   }
+}

engine/src/main/java/com/bartlomiejpluta/base/engine/project/loader/DefaultProjectLoader.java

@@ -1,6 +1,6 @@
 package com.bartlomiejpluta.base.engine.project.loader;
 
-import com.bartlomiejpluta.base.engine.gui.font.manager.FontManager;
+import com.bartlomiejpluta.base.engine.gui.manager.FontManager;
 import com.bartlomiejpluta.base.engine.project.config.ProjectConfiguration;
 import com.bartlomiejpluta.base.engine.project.model.Project;
 import com.bartlomiejpluta.base.engine.project.serial.ProjectDeserializer;

engine/src/main/java/com/bartlomiejpluta/base/engine/project/model/Project.java

@@ -1,6 +1,6 @@
 package com.bartlomiejpluta.base.engine.project.model;
 
-import com.bartlomiejpluta.base.engine.gui.font.asset.FontAsset;
+import com.bartlomiejpluta.base.engine.gui.asset.FontAsset;
 import com.bartlomiejpluta.base.engine.world.entity.asset.EntitySetAsset;
 import com.bartlomiejpluta.base.engine.world.image.asset.ImageAsset;
 import com.bartlomiejpluta.base.engine.world.map.asset.GameMapAsset;

engine/src/main/java/com/bartlomiejpluta/base/engine/project/model/RenderableContext.java

@@ -3,12 +3,15 @@ package com.bartlomiejpluta.base.engine.project.model;
 import com.bartlomiejpluta.base.api.game.camera.Camera;
 import com.bartlomiejpluta.base.api.game.context.Context;
 import com.bartlomiejpluta.base.api.game.entity.Entity;
+import com.bartlomiejpluta.base.api.game.gui.GUI;
 import com.bartlomiejpluta.base.api.game.image.Image;
 import com.bartlomiejpluta.base.api.game.map.handler.MapHandler;
 import com.bartlomiejpluta.base.api.game.screen.Screen;
+import com.bartlomiejpluta.base.api.internal.gc.Cleanable;
 import com.bartlomiejpluta.base.api.internal.logic.Updatable;
 import com.bartlomiejpluta.base.api.internal.render.Renderable;
 import com.bartlomiejpluta.base.api.internal.render.ShaderManager;
+import com.bartlomiejpluta.base.engine.gui.render.NanoVGGUI;
 import com.bartlomiejpluta.base.engine.project.loader.ClassLoader;
 import com.bartlomiejpluta.base.engine.world.entity.manager.EntityManager;
 import com.bartlomiejpluta.base.engine.world.image.manager.ImageManager;
@@ -20,9 +23,12 @@ import lombok.SneakyThrows;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
+import java.util.LinkedList;
+import java.util.List;
+
 @Component
 @RequiredArgsConstructor(onConstructor = @__(@Autowired))
-public class RenderableContext implements Context, Updatable, Renderable {
+public class RenderableContext implements Context, Updatable, Renderable, Cleanable {
    private final EntityManager entityManager;
    private final ImageManager imageManager;
    private final MapManager mapManager;
@@ -33,6 +39,8 @@ public class RenderableContext implements Context, Updatable, Renderable {
    private DefaultGameMap map;
    private MapHandler mapHandler;
 
+   private final List<GUI> guis = new LinkedList<>();
+
    @Getter
    private Camera camera;
 
@@ -60,6 +68,14 @@ public class RenderableContext implements Context, Updatable, Renderable {
       return imageManager.loadObject(imageUid);
    }
 
+   @Override
+   public GUI newGUI() {
+      var gui = new NanoVGGUI();
+      guis.add(gui);
+      gui.init(screen);
+      return gui;
+   }
+
    public void input(Screen screen) {
       if (mapHandler != null) {
          mapHandler.input(screen);
@@ -83,8 +99,17 @@ public class RenderableContext implements Context, Updatable, Renderable {
          map.render(screen, camera, shaderManager);
       }
 
+      for (var gui : guis) {
+         gui.render(screen, camera, shaderManager);
+      }
+
       if (mapHandler != null) {
          mapHandler.postRender(screen);
       }
    }
+
+   @Override
+   public void cleanUp() {
+      guis.forEach(GUI::dispose);
+   }
 }

engine/src/main/java/com/bartlomiejpluta/base/engine/project/serial/ProtobufProjectDeserializer.java

@@ -1,6 +1,6 @@
 package com.bartlomiejpluta.base.engine.project.serial;
 
-import com.bartlomiejpluta.base.engine.gui.font.asset.FontAsset;
+import com.bartlomiejpluta.base.engine.gui.asset.FontAsset;
 import com.bartlomiejpluta.base.engine.project.model.Project;
 import com.bartlomiejpluta.base.engine.world.entity.asset.EntitySetAsset;
 import com.bartlomiejpluta.base.engine.world.image.asset.ImageAsset;

engine/src/main/java/com/bartlomiejpluta/base/engine/ui/GLFWScreen.java

@@ -135,6 +135,13 @@ public class GLFWScreen implements Screen {
       glClearColor(r, g, b, alpha);
    }
 
+   @Override
+   public void restoreState() {
+      glEnable(GL_STENCIL_TEST);
+      glEnable(GL_BLEND);
+      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+   }
+
    @Override
    public boolean shouldClose() {
       return glfwWindowShouldClose(windowHandle);