Add support for material color

The GL_DEPTH_TEST (in the Window.java) has been disabled (removed)
because in the 2D graphics we don't need that, even more it was making
alpha color-channel unusable.

app/src/main/java/com/bartlomiejpluta/samplegame/core/gl/object/material/Material.java

@@ -0,0 +1,24 @@
+package com.bartlomiejpluta.samplegame.core.gl.object.material;
+
+import lombok.Getter;
+import org.joml.Vector4f;
+
+@Getter
+public class Material {
+   private final Vector4f color = new Vector4f();
+
+   private Material(float r, float g, float b, float alpha) {
+      setColor(r, g, b, alpha);
+   }
+
+   public void setColor(float r, float g, float b, float alpha) {
+      color.x = r;
+      color.y = g;
+      color.z = b;
+      color.w = alpha;
+   }
+
+   public static Material colored(float r, float g, float b, float alpha) {
+      return new Material(r, g, b, alpha);
+   }
+}

app/src/main/java/com/bartlomiejpluta/samplegame/core/gl/object/mesh/Mesh.java

@@ -1,8 +1,12 @@
 package com.bartlomiejpluta.samplegame.core.gl.object.mesh;
 
+import com.bartlomiejpluta.samplegame.core.gl.object.material.Material;
 import com.bartlomiejpluta.samplegame.core.gl.render.Renderable;
 import com.bartlomiejpluta.samplegame.core.gl.shader.manager.ShaderManager;
 import com.bartlomiejpluta.samplegame.core.ui.Window;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
 import org.lwjgl.opengl.GL15;
 import org.lwjgl.system.MemoryStack;
 
@@ -18,6 +22,10 @@ public class Mesh implements Renderable {
    private final List<Integer> vboIds = new ArrayList<>(2);
    private final int elementsCount;
 
+   @Getter
+   @Setter
+   private Material material;
+
    public Mesh(float[] vertices, int[] elements) {
       try(var stack = MemoryStack.stackPush()) {
          elementsCount = elements.length;

app/src/main/java/com/bartlomiejpluta/samplegame/core/gl/render/DefaultRenderer.java

@@ -24,7 +24,8 @@ public class DefaultRenderer implements Renderer {
               .selectShader("default")
               .createUniform(UniformName.UNI_MODEL_MATRIX)
               .createUniform(UniformName.UNI_VIEW_MATRIX)
-              .createUniform(UniformName.UNI_PROJECTION_MATRIX);
+              .createUniform(UniformName.UNI_PROJECTION_MATRIX)
+              .createUniform(UniformName.UNI_OBJECT_COLOR);
    }
 
    @Override

app/src/main/java/com/bartlomiejpluta/samplegame/core/gl/shader/constant/UniformName.java

@@ -4,4 +4,5 @@ public interface UniformName {
    String UNI_MODEL_MATRIX = "modelMatrix";
    String UNI_VIEW_MATRIX = "viewMatrix";
    String UNI_PROJECTION_MATRIX = "projectionMatrix";
+   String UNI_OBJECT_COLOR = "objectColor";
 }

app/src/main/java/com/bartlomiejpluta/samplegame/core/ui/Window.java

@@ -90,7 +90,6 @@ public class Window {
 
       // Set the clear color
       glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
-      glEnable(GL_DEPTH_TEST);
    }
 
    public void update() {

app/src/main/java/com/bartlomiejpluta/samplegame/core/world/object/RenderableObject.java

@@ -1,5 +1,6 @@
 package com.bartlomiejpluta.samplegame.core.world.object;
 
+import com.bartlomiejpluta.samplegame.core.gl.object.material.Material;
 import com.bartlomiejpluta.samplegame.core.gl.object.mesh.Mesh;
 import com.bartlomiejpluta.samplegame.core.gl.render.Renderable;
 import com.bartlomiejpluta.samplegame.core.gl.shader.manager.ShaderManager;
@@ -10,6 +11,14 @@ import lombok.RequiredArgsConstructor;
 public abstract class RenderableObject extends Object implements Renderable {
    private final Mesh mesh;
 
+   public void setMaterial(Material material) {
+      mesh.setMaterial(material);
+   }
+
+   public Material getMaterial() {
+      return mesh.getMaterial();
+   }
+
    @Override
    public void render(Window window, ShaderManager shaderManager) {
       mesh.render(window, shaderManager);

app/src/main/java/com/bartlomiejpluta/samplegame/core/world/object/Sprite.java

@@ -1,21 +0,0 @@
-package com.bartlomiejpluta.samplegame.core.world.object;
-
-import com.bartlomiejpluta.samplegame.core.gl.object.mesh.Mesh;
-
-public class Sprite extends RenderableObject {
-   private static final float[] VERTICES = new float[]{
-           -0.5f,  0.5f, 0.0f,
-           -0.5f, -0.5f, 0.0f,
-            0.5f, -0.5f, 0.0f,
-            0.5f,  0.5f, 0.0f
-   };
-
-   private static final int[] ELEMENTS = new int[]{
-           0, 1, 2,
-           2, 3, 0
-   };
-
-   public Sprite() {
-      super(new Mesh(VERTICES, ELEMENTS));
-   }
-}

app/src/main/java/com/bartlomiejpluta/samplegame/core/world/scene/Scene.java

@@ -28,6 +28,7 @@ public class Scene implements Renderable {
 
       for(var object : objects) {
          shaderManager.setUniform(UniformName.UNI_MODEL_MATRIX, object.getModelMatrix());
+         shaderManager.setUniform(UniformName.UNI_OBJECT_COLOR, object.getMaterial().getColor());
          object.render(window, shaderManager);
       }
    }

app/src/main/java/com/bartlomiejpluta/samplegame/game/logic/DefaultGameLogic.java

@@ -1,14 +1,13 @@
 package com.bartlomiejpluta.samplegame.game.logic;
 
+import com.bartlomiejpluta.samplegame.core.gl.object.material.Material;
 import com.bartlomiejpluta.samplegame.core.gl.render.Renderer;
 import com.bartlomiejpluta.samplegame.core.logic.GameLogic;
 import com.bartlomiejpluta.samplegame.core.ui.Window;
 import com.bartlomiejpluta.samplegame.core.world.camera.Camera;
-import com.bartlomiejpluta.samplegame.core.world.object.Sprite;
 import com.bartlomiejpluta.samplegame.core.world.scene.Scene;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.joml.Vector3f;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
@@ -20,17 +19,12 @@ public class DefaultGameLogic implements GameLogic {
    private final Camera camera = new Camera();
    private final Scene scene = new Scene(camera);
 
-   Sprite sprite;
-
    @Override
    public void init(Window window) {
       log.info("Initializing game logic");
       renderer.init();
 
-      sprite = new Sprite();
+
-      sprite.setPosition(window.getWidth() / 2.0f, window.getHeight() / 2.0f);
-      sprite.setScale(100);
-      scene.add(sprite);
    }
 
    @Override

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

@@ -1,8 +1,10 @@
 #version 330
 
+uniform vec4 objectColor;
+
 out vec4 fragColor;
 
 void main()
 {
-   fragColor = vec4(0.0, 0.5, 0.5, 1.0);
+   fragColor = objectColor;
 }