From 32117d0bf27e0a72165707fe4e56d231136e734b Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Sat, 16 Jan 2010 17:50:43 +0100
Subject: Use index buffers to render tiles

---
 .../gamezock/metacraft/data/IndexedTriangle.java   | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/de/gamezock/metacraft/data/IndexedTriangle.java

(limited to 'src/de/gamezock/metacraft/data/IndexedTriangle.java')

diff --git a/src/de/gamezock/metacraft/data/IndexedTriangle.java b/src/de/gamezock/metacraft/data/IndexedTriangle.java
new file mode 100644
index 0000000..9a999d6
--- /dev/null
+++ b/src/de/gamezock/metacraft/data/IndexedTriangle.java
@@ -0,0 +1,51 @@
+package de.gamezock.metacraft.data;
+
+import javax.vecmath.Point3f;
+import javax.vecmath.Vector3f;
+
+public class IndexedTriangle {
+  private VertexBuffer buffer;
+  
+  private int[] indices;
+  private Vector3f normal;
+  
+  public IndexedTriangle(VertexBuffer buffer, int v1, int v2, int v3) {
+    this.buffer = buffer;
+    
+    indices = new int[3];
+    indices[0] = v1;
+    indices[1] = v2;
+    indices[2] = v3;
+    
+    Vector3f edge1 = new Vector3f(), edge2 = new Vector3f();
+    
+    Point3f p1 = buffer.getVertex(v1), p2 = buffer.getVertex(v2), p3 = buffer.getVertex(v3);
+    
+    edge1.sub(p1, p2);
+    edge2.sub(p3, p2);
+    
+    normal = new Vector3f();
+    normal.cross(edge1, edge2);
+    normal.normalize();
+  }
+  
+  public VertexBuffer getBuffer() {
+    return buffer;
+  }
+  
+  public int getIndex(int i) {
+    return indices[i];
+  }
+  
+  public Point3f getVertex(int i) {
+    return buffer.getVertex(indices[i]);
+  }
+  
+  public Vector3f getVertexNormal(int i) {
+    return buffer.getNormal(indices[i]);
+  }
+  
+  public Vector3f getNormal() {
+    return normal;
+  }
+}
-- 
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