#30 - Implemented SpriteBatch class

src/main/java/com/shc/silenceengine/graphics/GraphicsEngine.java

@@ -32,6 +32,8 @@
 import com.shc.silenceengine.graphics.programs.DefaultProgram;
 import com.shc.silenceengine.graphics.programs.DirectionalLightProgram;
 import com.shc.silenceengine.graphics.programs.PointLightProgram;
+import org.lwjgl.opengl.ContextCapabilities;
+import org.lwjgl.opengl.GL;
 
 import static org.lwjgl.opengl.GL11.*;
 
@@ -50,6 +52,7 @@ public class GraphicsEngine implements IEngine
     private Material currentMaterial;
     private Batcher  batcher;
     private ModelBatch modelBatch;
+    private SpriteBatch spriteBatch;
 
     public Material getCurrentMaterial()
     {
@@ -94,6 +97,7 @@ public void init()
         setClearColor(clearColor);
 
         modelBatch = new ModelBatch();
+        spriteBatch = new SpriteBatch();
 
         // Default font!!
         TrueTypeFont.DEFAULT = new TrueTypeFont("Verdana", TrueTypeFont.STYLE_NORMAL, 16);
@@ -180,6 +184,16 @@ public ModelBatch getModelBatch()
         return modelBatch;
     }
 
+    public SpriteBatch getSpriteBatch()
+    {
+        return spriteBatch;
+    }
+
+    public ContextCapabilities getGLCapabilities()
+    {
+        return GL.getCapabilities();
+    }
+
     static
     {
         DEFAULT_MATERIAL = new Material();

src/main/java/com/shc/silenceengine/graphics/Sprite.java

@@ -43,19 +43,32 @@ public class Sprite
 
     public Sprite()
     {
-        animation = new Animation();
-        id = IDGenerator.generate();
+        this(new Animation(), 1, 1, 0);
     }
 
     public Sprite(Animation animation)
     {
-        this.animation = animation.copy();
-        id = IDGenerator.generate();
+        this(animation, 1, 1, 0);
     }
 
     public Sprite(Texture texture)
     {
-        this();
+        this(texture, 1, 1, 0);
+    }
+
+    public Sprite(Animation animation, float scaleX, float scaleY, float rotation)
+    {
+        id = IDGenerator.generate();
+
+        this.animation = animation.copy();
+        this.scaleX = scaleX;
+        this.scaleY = scaleY;
+        this.rotation = rotation;
+    }
+
+    public Sprite(Texture texture, float scaleX, float scaleY, float rotation)
+    {
+        this(new Animation(), scaleX, scaleY, rotation);
         setTexture(texture);
     }
 

src/main/java/com/shc/silenceengine/graphics/SpriteBatch.java

@@ -0,0 +1,163 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2015 Sri Harsha Chilakapati
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.shc.silenceengine.graphics;
+
+import com.shc.silenceengine.core.SilenceEngine;
+import com.shc.silenceengine.core.SilenceException;
+import com.shc.silenceengine.graphics.opengl.Primitive;
+import com.shc.silenceengine.graphics.opengl.Texture;
+import com.shc.silenceengine.math.Vector2;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author Sri Harsha Chilakapati
+ */
+public class SpriteBatch
+{
+    private List<Sprite>          sprites;
+    private Map<Integer, Vector2> spritePositionMap;
+
+    private boolean active;
+
+    public SpriteBatch()
+    {
+        sprites = new ArrayList<>();
+        spritePositionMap = new HashMap<>();
+        active = false;
+    }
+
+    public void begin()
+    {
+        if (active)
+            throw new SilenceException("SpriteBatch already active");
+
+        sprites.clear();
+
+        active = true;
+    }
+
+    public void flush()
+    {
+        if (sprites.size() == 0)
+            return;
+
+        sortSprites();
+
+        Batcher batcher = SilenceEngine.graphics.getBatcher();
+
+        Texture originalTexture = Texture.CURRENT;
+
+        Texture texture = sprites.get(0).getTexture();
+        texture.bind();
+
+        Vector2 temp = Vector2.REUSABLE_STACK.pop();
+
+        batcher.begin(Primitive.TRIANGLES);
+        {
+            for (Sprite sprite : sprites)
+            {
+                Texture t = sprite.getTexture();
+
+                if (t.getId() != texture.getId())
+                {
+                    batcher.end();
+
+                    texture = t;
+                    t.bind();
+
+                    batcher.begin();
+                }
+
+                Vector2 position = spritePositionMap.get(sprite.getID());
+
+                // Triangle 1
+                batcher.vertex(temp.set(-texture.getWidth() / 2, -texture.getHeight() / 2)  // Top-left
+                        .rotateSelf(sprite.getRotation())
+                        .scaleSelf(sprite.getScaleX(), sprite.getScaleY())
+                        .addSelf(position).addSelf(texture.getWidth()/2, texture.getHeight()/2));
+                batcher.texCoord(texture.getMinU(), texture.getMinV());
+                batcher.vertex(temp.set(texture.getWidth() / 2, -texture.getHeight() / 2)   // Top-right
+                        .rotateSelf(sprite.getRotation())
+                        .scaleSelf(sprite.getScaleX(), sprite.getScaleY())
+                        .addSelf(position).addSelf(texture.getWidth() / 2, texture.getHeight() / 2));
+                batcher.texCoord(texture.getMaxU(), texture.getMinV());
+                batcher.vertex(temp.set(-texture.getWidth() / 2, texture.getHeight() / 2)   // Bottom-left
+                        .rotateSelf(sprite.getRotation())
+                        .scaleSelf(sprite.getScaleX(), sprite.getScaleY())
+                        .addSelf(position).addSelf(texture.getWidth() / 2, texture.getHeight() / 2));
+                batcher.texCoord(texture.getMinU(), texture.getMaxV());
+
+                // Triangle 2
+                batcher.vertex(temp.set(texture.getWidth() / 2, -texture.getHeight() / 2)   // Top-right
+                        .rotateSelf(sprite.getRotation())
+                        .scaleSelf(sprite.getScaleX(), sprite.getScaleY())
+                        .addSelf(position).addSelf(texture.getWidth() / 2, texture.getHeight() / 2));
+                batcher.texCoord(texture.getMaxU(), texture.getMinV());
+                batcher.vertex(temp.set(texture.getWidth() / 2, texture.getHeight() / 2)   // Bottom-right
+                        .rotateSelf(sprite.getRotation())
+                        .scaleSelf(sprite.getScaleX(), sprite.getScaleY())
+                        .addSelf(position).addSelf(texture.getWidth() / 2, texture.getHeight() / 2));
+                batcher.texCoord(texture.getMaxU(), texture.getMaxV());
+                batcher.vertex(temp.set(-texture.getWidth() / 2, texture.getHeight() / 2)   // Bottom-left
+                        .rotateSelf(sprite.getRotation())
+                        .scaleSelf(sprite.getScaleX(), sprite.getScaleY())
+                        .addSelf(position).addSelf(texture.getWidth()/2, texture.getHeight()/2));
+                batcher.texCoord(texture.getMinU(), texture.getMaxV());
+            }
+        }
+        batcher.end();
+
+        Vector2.REUSABLE_STACK.push(temp);
+
+        sprites.clear();
+        spritePositionMap.clear();
+
+        originalTexture.bind();
+    }
+
+    public void end()
+    {
+        if (!active)
+            throw new SilenceException("SpriteBatch is not active");
+
+        flush();
+        active = false;
+    }
+
+    private void sortSprites()
+    {
+        sprites.sort((s1, s2) -> s1.getTexture().getId() < s2.getTexture().getId() ? 1 : -1);
+    }
+
+    public void addSprite(Sprite sprite, Vector2 position)
+    {
+        sprites.add(sprite);
+        spritePositionMap.put(sprite.getID(), position);
+    }
+}

src/main/java/com/shc/silenceengine/models/Model.java

@@ -71,6 +71,7 @@ public void render(Batcher batcher, Transform transform)
         Texture originalTexture = Texture.CURRENT;
 
         SilenceEngine.graphics.useMaterial(m.getMaterial());
+        m.getMaterial().getDiffuseMap().bind();
 
         if (transform != null) batcher.applyTransform(transform);
         batcher.begin();