From 722fd26511d63a92f4a17ccb7fcf1b3d4fd0b355 Mon Sep 17 00:00:00 2001
From: Ziver Koc <ziver@koc.se>
Date: Thu, 23 Apr 2020 23:17:28 +0200
Subject: [PATCH] Basic terrain mesh done

---
 .idea/misc.xml                                |  2 +-
 core/core.iml                                 |  2 +-
 core/src/se/cookery/CookeryClient.java        | 26 +-------
 core/src/se/cookery/core/world/Block.java     |  2 +-
 .../se/cookery/gfx/terrain/TerrainMesh.java   | 63 ++++++++++++-------
 .../cookery/gfx/terrain/TerrainMeshTest.java  | 41 +++++++++---
 desktop/desktop.iml                           |  2 +-
 7 files changed, 78 insertions(+), 60 deletions(-)

diff --git a/.idea/misc.xml b/.idea/misc.xml
index 140105b..3a93b1f 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -8,5 +8,5 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="11" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK" />
 </project>
\ No newline at end of file
diff --git a/core/core.iml b/core/core.iml
index d33fa4b..42e26dc 100644
--- a/core/core.iml
+++ b/core/core.iml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" type="JAVA_MODULE" version="4">
+<module version="4">
   <component name="FacetManager">
     <facet type="android-gradle" name="Android-Gradle">
       <configuration>
diff --git a/core/src/se/cookery/CookeryClient.java b/core/src/se/cookery/CookeryClient.java
index 6811b40..4a9dcf6 100644
--- a/core/src/se/cookery/CookeryClient.java
+++ b/core/src/se/cookery/CookeryClient.java
@@ -9,7 +9,6 @@ import se.cookery.core.world.Block;
 import se.cookery.core.world.gen.GrassLandWorldGenerator;
 import se.cookery.gfx.character.Player;
 import se.cookery.gfx.terrain.TerrainMesh;
-import se.cookery.gfx.util.GeometryUtil;
 import se.cookery.gfx.util.MaterialUtil;
 import se.cookery.gfx.util.WireFrameProcessor;
 
@@ -22,32 +21,9 @@ public class CookeryClient extends SimpleApplication {
         cam.setLocation(new Vector3f(0,20,-10));
         cam.lookAt(new Vector3f(0f,0f,0f), Vector3f.UNIT_Z);
 
-        /** 3. We have prepared material and heightmap.
-         * Now we create the actual terrain:
-         * 3.1) Create a TerrainQuad and name it "my terrain".
-         * 3.2) A good value for terrain tiles is 64x64 -- so we supply 64+1=65.
-         * 3.3) We prepared a heightmap of size 512x512 -- so we supply 512+1=513.
-         * 3.4) As LOD step scale we supply Vector3f(1,1,1).
-         * 3.5) We supply the prepared heightmap itself.
-         */
-
         Block block = new GrassLandWorldGenerator().generateBlock(0, 0);
-        /*float[] heightMap = new float[Block.BLOCK_SIZE*Block.BLOCK_SIZE];
 
-        for (int x=0; x<Block.BLOCK_SIZE; x++) {
-            for (int y=0; y<Block.BLOCK_SIZE; y++) {
-                heightMap[Block.BLOCK_SIZE * x + y] = block.getHeight(x, y);
-            }
-        }
-        heightMap[Block.BLOCK_SIZE*Block.BLOCK_SIZE/2+Block.BLOCK_SIZE/2] = 1;
-        terrain = new TerrainQuad("Ground", Block.BLOCK_SIZE+1, Block.BLOCK_SIZE+1, heightMap);
-
-        Material green = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
-        green.setColor("Color", ColorRGBA.Green);
-        terrain.setMaterial(green);
-        rootNode.attachChild(terrain);*/
-
-        Geometry terrain = new Geometry("terrain", new TerrainMesh(1, 1, 1, 1));
+        Geometry terrain = new Geometry("terrain", new TerrainMesh(1, 1, Block.BLOCK_SIZE, Block.BLOCK_SIZE));
         terrain.setMaterial(MaterialUtil.createMaterial(assetManager, ColorRGBA.Green));
         rootNode.attachChild(terrain);
 
diff --git a/core/src/se/cookery/core/world/Block.java b/core/src/se/cookery/core/world/Block.java
index 071eb65..005e73c 100644
--- a/core/src/se/cookery/core/world/Block.java
+++ b/core/src/se/cookery/core/world/Block.java
@@ -11,7 +11,7 @@ public class Block {
     /**
      * The size of a block in units of squares. The block is a square with size BLOCK_SIZE x BLOCK_SIZE.
      **/
-    public static final int BLOCK_SIZE = 64;
+    public static final int BLOCK_SIZE = 20;
 
     // Variables
 
diff --git a/core/src/se/cookery/gfx/terrain/TerrainMesh.java b/core/src/se/cookery/gfx/terrain/TerrainMesh.java
index e638196..1f2be91 100644
--- a/core/src/se/cookery/gfx/terrain/TerrainMesh.java
+++ b/core/src/se/cookery/gfx/terrain/TerrainMesh.java
@@ -1,17 +1,8 @@
 package se.cookery.gfx.terrain;
 
-import com.jme3.export.InputCapsule;
-import com.jme3.export.JmeExporter;
-import com.jme3.export.JmeImporter;
-import com.jme3.export.OutputCapsule;
 import com.jme3.scene.Mesh;
 import com.jme3.scene.VertexBuffer;
 
-import java.io.File;
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-
 
 /**
  * Class will generate a terrain mesh from a TerrainMap
@@ -34,6 +25,8 @@ public class TerrainMesh extends Mesh {
     public TerrainMesh(float width, float height, int widthCount, int heightCount){
         this.width = width;
         this.height = height;
+        this.widthCount = widthCount;
+        this.heightCount = heightCount;
 
         updateGeometry();
     }
@@ -41,8 +34,8 @@ public class TerrainMesh extends Mesh {
     protected void updateGeometry() {
         setBuffer(VertexBuffer.Type.Position, 3, generateVertexBuffer());
         setBuffer(VertexBuffer.Type.Index, 3, generateIndexBuffer());
-        setBuffer(VertexBuffer.Type.TexCoord, 2, generateTextureBuffer());
-        setBuffer(VertexBuffer.Type.Normal, 3, generateNormalBuffer());
+//        setBuffer(VertexBuffer.Type.TexCoord, 2, generateTextureBuffer());
+//        setBuffer(VertexBuffer.Type.Normal, 3, generateNormalBuffer());
 
         updateBound();
         setStatic();
@@ -52,25 +45,49 @@ public class TerrainMesh extends Mesh {
      * Generates a vertex buffer containing vertex xyz coordinates.
      */
     protected float[] generateVertexBuffer() {
-        float[] vertexBuf = new float[3 * widthCount * heightCount];
+        int vertexCountWidth = widthCount + 1;
+        int vertexCountHeight = heightCount + 1;
+        float[] vertexBuf = new float[3 * vertexCountWidth * vertexCountHeight];
 
-        return new float[]{
-            //  x,     y,      z
-                0,     0,      0,
-                0,     0, height,
-                width, 0, height,
-                width, 0,      0,
-        };
+        for (int row=0; row<vertexCountHeight; row++) {
+            for (int col=0; col<vertexCountWidth; col++) {
+                int vertexIndex = (3 * vertexCountWidth * row) + (3 * col);
+                vertexBuf[vertexIndex + 0] = width * col; // X
+                vertexBuf[vertexIndex + 1] = 0; // Y
+                vertexBuf[vertexIndex + 2] = height * row; // Z
+            }
+        }
+
+        return vertexBuf;
     }
 
     /**
      * Generates a index buffer containing planes for the mesh.
      */
     protected short[] generateIndexBuffer() {
-        return new short[]{
-                0, 1, 3,
-                3, 1, 2
-        };
+        int vertexCountWidth = widthCount + 1;
+        int triangleCount = widthCount * heightCount * 2;
+        short[] indexBuf = new short[3 * triangleCount];
+
+        for (int row=0; row<heightCount; row++) {
+            for (int col = 0; col<widthCount; col++) {
+                int vertexTopLeft = (row * vertexCountWidth) + col;
+                int vertexTopRight = vertexTopLeft + 1;
+                int vertexBottomLeft = ((row + 1) * vertexCountWidth) + col;
+                int vertexBottomRight = vertexBottomLeft + 1;
+                int indexOffset = 3 * 2 * ((row * widthCount) + col);
+
+                indexBuf[indexOffset + 0] = (short) vertexTopLeft;
+                indexBuf[indexOffset + 1] = (short) vertexBottomLeft;
+                indexBuf[indexOffset + 2] = (short) vertexTopRight;
+
+                indexBuf[indexOffset + 3] = (short) vertexTopRight;
+                indexBuf[indexOffset + 4] = (short) vertexBottomLeft;
+                indexBuf[indexOffset + 5] = (short) vertexBottomRight;
+            }
+        }
+
+        return indexBuf;
     }
 
     /**
diff --git a/core/test/se/cookery/gfx/terrain/TerrainMeshTest.java b/core/test/se/cookery/gfx/terrain/TerrainMeshTest.java
index ff2aaf9..58d72fa 100644
--- a/core/test/se/cookery/gfx/terrain/TerrainMeshTest.java
+++ b/core/test/se/cookery/gfx/terrain/TerrainMeshTest.java
@@ -10,27 +10,52 @@ class TerrainMeshTest {
     public void singleSquareTerrain(){
         TerrainMesh terrain = new TerrainMesh(1, 1, 1 ,1);
 
-        float[] index = terrain.generateVertexBuffer();
-        assertEquals(3*4, index.length);
+        float[] vertexBuffer = terrain.generateVertexBuffer();
+        assertEquals(3 * 4, vertexBuffer.length);
         assertArrayEquals(new float[]{
                 0, 0, 0,
+                1, 0, 0,
                 0, 0, 1,
                 1, 0, 1,
-                1, 0, 0,
-        }, index);
+        }, vertexBuffer);
+
+        short[] indexBuffer = terrain.generateIndexBuffer();
+        assertEquals(3 * 2, indexBuffer.length);
+        assertArrayEquals(new short[]{
+                0, 2, 1,
+                1, 2, 3,
+        }, indexBuffer);
     }
 
     @Test
     public void fourSquareTerrain(){
         TerrainMesh terrain = new TerrainMesh(1, 1, 2 ,2);
 
-        float[] index = terrain.generateVertexBuffer();
-        assertEquals(3*9, index.length);
+        float[] vertexBuffer = terrain.generateVertexBuffer();
+        assertEquals(3 * 9, vertexBuffer.length);
         assertArrayEquals(new float[]{
                 0, 0, 0,
+                1, 0, 0,
+                2, 0, 0,
                 0, 0, 1,
                 1, 0, 1,
-                1, 0, 0,
-        }, index);
+                2, 0, 1,
+                0, 0, 2,
+                1, 0, 2,
+                2, 0, 2,
+        }, vertexBuffer);
+
+        short[] indexBuffer = terrain.generateIndexBuffer();
+        assertEquals(3 * 8, indexBuffer.length);
+        assertArrayEquals(new short[]{
+                0, 3, 1,
+                1, 3, 4,
+                1, 4, 2,
+                2, 4, 5,
+                3, 6, 4,
+                4, 6, 7,
+                4, 7, 5,
+                5, 7, 8,
+        }, indexBuffer);
     }
 }
\ No newline at end of file
diff --git a/desktop/desktop.iml b/desktop/desktop.iml
index 88c8105..65cef4a 100644
--- a/desktop/desktop.iml
+++ b/desktop/desktop.iml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" type="JAVA_MODULE" version="4">
+<module version="4">
   <component name="FacetManager">
     <facet type="android-gradle" name="Android-Gradle">
       <configuration>