From 168257e92c9bfa7bd531b19734a6a1bf0de30367 Mon Sep 17 00:00:00 2001
From: okseby <okseby@protonmail.com>
Date: Wed, 31 May 2023 19:11:43 -0400
Subject: [PATCH] Add camera movement.

---
 res/textures/grassblock.jpg                   | Bin 0 -> 20480 bytes
 src/main/java/com/okseby/core/Camera.java     |  49 ++++++++
 .../java/com/okseby/core/EngineManager.java   |  10 +-
 src/main/java/com/okseby/core/Launcher.java   |   2 +-
 .../java/com/okseby/core/RenderManager.java   |   6 +-
 .../java/com/okseby/core/WindowManager.java   |  13 ++-
 .../java/com/okseby/core/test/TestGame.java   | 108 ++++++++++++------
 .../com/okseby/core/utils/Transformation.java |  17 +++
 src/main/resources/shaders/vertex.vs          |   4 +-
 9 files changed, 161 insertions(+), 48 deletions(-)
 create mode 100644 res/textures/grassblock.jpg
 create mode 100644 src/main/java/com/okseby/core/Camera.java

diff --git a/res/textures/grassblock.jpg b/res/textures/grassblock.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..4f87254fcc106dc8a66e6d8a40051f170a353926
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zx{}a#SVSj2O^riu#lT~mESN4Nia{gJZyeC<g962uS6HV3>-2M2hp`<_g`Fc+Fbc8j
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z$!^U&V0Nh@t=5XabJ0eFCu?t0zW7+=m*P4Va4A^x4#t>bbPvDNG-r4XlSFKHJNr54
z_`gBHAgs^U6=u6qHB^vN9AwsffBh~^hI)f-pGKRc-4FKn)$f45!q_=rbnd|Q`@jWQ
zFvCbx?LKlj;Cs4GUx1l2oK&|5hEeREFyhck)`2e3@q&2T>>e$(%Tx+i3QoWT04u)4
zeMZm-e&a+SyUcl}<m8<)hm$~J*Sd*@ZGe=)1eF6)tY<s-hC!p(onKLcb>}->i@YYj
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RhyMRV|No)?|9{f|{|5&&NM8T|

literal 0
HcmV?d00001

diff --git a/src/main/java/com/okseby/core/Camera.java b/src/main/java/com/okseby/core/Camera.java
new file mode 100644
index 0000000..3191732
--- /dev/null
+++ b/src/main/java/com/okseby/core/Camera.java
@@ -0,0 +1,49 @@
+package com.okseby.core;
+
+import lombok.Getter;
+import org.joml.Vector3f;
+
+public class Camera {
+    @Getter private Vector3f position, rotation;
+
+    public Camera() {
+        position = new Vector3f(0, 0, 0);
+        rotation = new Vector3f(0, 0, 0);
+    }
+
+    public Camera(Vector3f position, Vector3f rotation) {
+        this.position = position;
+        this.rotation = rotation;
+    }
+
+    public void movePosition(float x, float y, float z) {
+        if (z != 0) {
+            position.x += (float) Math.sin(Math.toRadians(rotation.y)) * -1.0f * z;
+            position.z += (float) Math.cos(Math.toRadians(rotation.y)) * z;
+        }
+        if (x != 0) {
+            position.x += (float) Math.sin(Math.toRadians(rotation.y - 90)) * -1.0f * x;
+            position.z += (float) Math.cos(Math.toRadians(rotation.y - 90)) * x;
+        }
+
+        position.y += y;
+    }
+
+    public void setPosition(float x, float y, float z) {
+        this.position.x = x;
+        this.position.y = y;
+        this.position.z = z;
+    }
+
+    public void setRotation(float x, float y, float z) {
+        this.rotation.x = x;
+        this.rotation.y = y;
+        this.rotation.z = z;
+    }
+
+    public void incrementRotation(float x, float y, float z) {
+        this.rotation.x += x;
+        this.rotation.y += y;
+        this.rotation.z += z;
+    }
+}
diff --git a/src/main/java/com/okseby/core/EngineManager.java b/src/main/java/com/okseby/core/EngineManager.java
index 1970777..d9df245 100644
--- a/src/main/java/com/okseby/core/EngineManager.java
+++ b/src/main/java/com/okseby/core/EngineManager.java
@@ -5,11 +5,11 @@ import org.lwjgl.glfw.GLFW;
 import org.lwjgl.glfw.GLFWErrorCallback;
 
 public class EngineManager {
-    public static final long NANOSECOND = 1000000000;
-    public static final float FRAMERATE = 1000;
+    public static final long nanosecond = 1000000000;
+    public static final float framerate = 1000;
 
     private static int fps;
-    private static float frametime = 1.0f / FRAMERATE;
+    private static float frametime = 1.0f / framerate;
 
     private boolean isRunning;
 
@@ -49,7 +49,7 @@ public class EngineManager {
             long passedTime = startTime - lastTime;
 
             lastTime = startTime;
-            unprocessedTime += passedTime / (double) NANOSECOND;
+            unprocessedTime += passedTime / (double) nanosecond;
             frameCounter += passedTime;
 
             input();
@@ -61,7 +61,7 @@ public class EngineManager {
                 if (window.windowShouldClose())
                     stop();
 
-                if (frameCounter >= NANOSECOND) {
+                if (frameCounter >= nanosecond) {
                     setFps(frames);
 
                     window.setTitle(Constants.title + " - FPS: " + getFps());
diff --git a/src/main/java/com/okseby/core/Launcher.java b/src/main/java/com/okseby/core/Launcher.java
index 258767e..b47ec22 100644
--- a/src/main/java/com/okseby/core/Launcher.java
+++ b/src/main/java/com/okseby/core/Launcher.java
@@ -13,7 +13,7 @@ public class Launcher {
     public static void main(String[] args) {
         System.out.println("LWJGL Version: " + Version.getVersion());
 
-        window = new WindowManager(Constants.title, 1600, 900, false);
+        window = new WindowManager(Constants.title, 1600, 900, true);
         game = new TestGame();
 
         EngineManager engine = new EngineManager();
diff --git a/src/main/java/com/okseby/core/RenderManager.java b/src/main/java/com/okseby/core/RenderManager.java
index 2db9e1f..129b8ef 100644
--- a/src/main/java/com/okseby/core/RenderManager.java
+++ b/src/main/java/com/okseby/core/RenderManager.java
@@ -27,15 +27,19 @@ public class RenderManager {
 
         shader.createUniform("textureSampler");
         shader.createUniform("transformationMatrix");
+        shader.createUniform("projectionMatrix");
+        shader.createUniform("viewMatrix");
     }
 
-    public void render(Entity entity) {
+    public void render(Entity entity, Camera camera) {
         clear();
 
         shader.bind();
 
         shader.setUniform("textureSampler", 0);
         shader.setUniform("transformationMatrix", Transformation.createTransformationMatrix(entity));
+        shader.setUniform("projectionMatrix", window.updateProjectionMatrix());
+        shader.setUniform("viewMatrix", Transformation.getViewMatrix(camera));
 
         GL30.glBindVertexArray(entity.getModel().getId());
         GL20.glEnableVertexAttribArray(0);
diff --git a/src/main/java/com/okseby/core/WindowManager.java b/src/main/java/com/okseby/core/WindowManager.java
index 48f1faf..735caa6 100644
--- a/src/main/java/com/okseby/core/WindowManager.java
+++ b/src/main/java/com/okseby/core/WindowManager.java
@@ -11,9 +11,9 @@ import org.lwjgl.opengl.GL11;
 import org.lwjgl.system.MemoryUtil;
 
 public class WindowManager {
-    public static final float FOV = (float) Math.toRadians(60);
-    public static final float Z_NEAR = 0.01f;
-    public static final float Z_FAR = 1000f;
+    public static final float fov = (float) Math.toRadians(60);
+    public static final float zNear = 0.01f;
+    public static final float zFar = 1000f;
 
     @Getter private String title;
     @Getter private long window;
@@ -90,8 +90,9 @@ public class WindowManager {
         GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
         GL11.glEnable(GL11.GL_DEPTH_TEST);
         GL11.glEnable(GL11.GL_STENCIL_TEST);
+        /* Culling disabled as it stops faces from rendering that should be
         GL11.glEnable(GL11.GL_CULL_FACE);
-        GL11.glCullFace(GL11.GL_BACK);
+        GL11.glCullFace(GL11.GL_BACK); */
     }
 
     public void update() {
@@ -121,11 +122,11 @@ public class WindowManager {
 
     public Matrix4f updateProjectionMatrix() {
         float aspectRatio = (float) width / height;
-        return projectionMatrix.setPerspective(FOV, aspectRatio, Z_NEAR, Z_FAR);
+        return projectionMatrix.setPerspective(fov, aspectRatio, zNear, zFar);
     }
 
     public Matrix4f updateProjectionMatrix(Matrix4f matrix) {
         float aspectRatio = (float) width / height;
-        return matrix.setPerspective(FOV, aspectRatio, Z_NEAR, Z_FAR);
+        return matrix.setPerspective(fov, aspectRatio, zNear, zFar);
     }
 }
diff --git a/src/main/java/com/okseby/core/test/TestGame.java b/src/main/java/com/okseby/core/test/TestGame.java
index db52932..47b3222 100644
--- a/src/main/java/com/okseby/core/test/TestGame.java
+++ b/src/main/java/com/okseby/core/test/TestGame.java
@@ -9,19 +9,23 @@ import org.lwjgl.glfw.GLFW;
 import org.lwjgl.opengl.GL11;
 
 public class TestGame implements ILogic {
-    private int direction = 0;
-    private float color = 0.0f;
+    private static final float cameraMoveSpeed = 0.05f;
 
     private final RenderManager renderer;
     private final ObjectLoader loader;
     private final WindowManager window;
 
     private Entity entity;
+    private Camera camera;
+
+    Vector3f cameraInc;
 
     public TestGame() {
         renderer = new RenderManager();
         window = Launcher.getWindow();
         loader = new ObjectLoader();
+        camera = new Camera();
+        cameraInc = new Vector3f(0, 0, 0);
     }
 
     @Override
@@ -29,51 +33,87 @@ public class TestGame implements ILogic {
         renderer.init();
 
         float[] vertices = {
-                -0.5f, 0.5f, 0f,
-                -0.5f, -0.5f, 0f,
-                0.5f, -0.5f, 0f,
-                0.5f, 0.5f, 0f,
-        };
-
-        int[] indices = {
-                0, 1, 3,
-                3, 1, 2
+                -0.5f, 0.5f, 0.5f,
+                -0.5f, -0.5f, 0.5f,
+                0.5f, -0.5f, 0.5f,
+                0.5f, 0.5f, 0.5f,
+                -0.5f, 0.5f, -0.5f,
+                0.5f, 0.5f, -0.5f,
+                -0.5f, -0.5f, -0.5f,
+                0.5f, -0.5f, -0.5f,
+                -0.5f, 0.5f, -0.5f,
+                0.5f, 0.5f, -0.5f,
+                -0.5f, 0.5f, 0.5f,
+                0.5f, 0.5f, 0.5f,
+                0.5f, 0.5f, 0.5f,
+                0.5f, -0.5f, 0.5f,
+                -0.5f, 0.5f, 0.5f,
+                -0.5f, -0.5f, 0.5f,
+                -0.5f, -0.5f, -0.5f,
+                0.5f, -0.5f, -0.5f,
+                -0.5f, -0.5f, 0.5f,
+                0.5f, -0.5f, 0.5f,
         };
 
         float[] textureCoordinates = {
-                0, 0,
-                0, 1,
-                1, 1,
-                1, 0
+                0.0f, 0.0f,
+                0.0f, 0.5f,
+                0.5f, 0.5f,
+                0.5f, 0.0f,
+                0.0f, 0.0f,
+                0.5f, 0.0f,
+                0.0f, 0.5f,
+                0.5f, 0.5f,
+                0.0f, 0.5f,
+                0.5f, 0.5f,
+                0.0f, 1.0f,
+                0.5f, 1.0f,
+                0.0f, 0.0f,
+                0.0f, 0.5f,
+                0.5f, 0.0f,
+                0.5f, 0.5f,
+                0.5f, 0.0f,
+                1.0f, 0.0f,
+                0.5f, 0.5f,
+                1.0f, 0.5f,
+        };
+
+        int[] indices = {
+                0, 1, 3, 3, 1, 2,
+                8, 10, 11, 9, 8, 11,
+                12, 13, 7, 5, 12, 7,
+                14, 15, 6, 4, 14, 6,
+                16, 18, 19, 17, 16, 19,
+                4, 6, 7, 5, 4, 7,
         };
 
         Model model = loader.loadModel(vertices, textureCoordinates, indices);
-        model.setTexture(new Texture(loader.loadTexture("res/textures/grassblock.png")));
+        model.setTexture(new Texture(loader.loadTexture("res/textures/grassblock.jpg")));
 
-        entity = new Entity(model, new Vector3f(1, 0, 0), new Vector3f(0, 0, 0), 1);
+        entity = new Entity(model, new Vector3f(0, 0, -5), new Vector3f(0, 0, 0), 1);
     }
 
     @Override
     public void input() {
-        if (window.isKeyPressed(GLFW.GLFW_KEY_UP))
-            direction = 1;
-        else if (window.isKeyPressed(GLFW.GLFW_KEY_DOWN))
-            direction = -1;
-        else
-            direction = 0;
+        cameraInc.set(0, 0, 0);
+        if (window.isKeyPressed(GLFW.GLFW_KEY_W))
+            cameraInc.z = -1;
+        if (window.isKeyPressed(GLFW.GLFW_KEY_A))
+            cameraInc.x = 1;
+        if (window.isKeyPressed(GLFW.GLFW_KEY_S))
+            cameraInc.z = 1;
+        if (window.isKeyPressed(GLFW.GLFW_KEY_D))
+            cameraInc.x = -1;
+        if (window.isKeyPressed(GLFW.GLFW_KEY_Z))
+            cameraInc.y = 1;
+        if (window.isKeyPressed(GLFW.GLFW_KEY_X))
+            cameraInc.y = -1;
     }
 
     @Override
     public void update() {
-        color += direction * 0.01f;
-        if (color > 1)
-            color = 1.0f;
-        else if (color <= 0)
-            color = 0.0f;
-
-        if (entity.getPosition().x < -1.5f)
-            entity.getPosition().x = 1.5f;
-        entity.getPosition().x -= 0.01f;
+        camera.movePosition(cameraInc.x * cameraMoveSpeed, cameraInc.y * cameraMoveSpeed, cameraInc.z * cameraMoveSpeed);
+        entity.incrementRotation(0.0f, 0.5f, 0.0f);
     }
 
     @Override
@@ -83,8 +123,8 @@ public class TestGame implements ILogic {
             window.setResizeable(true);
         }
 
-        window.setClearColor(color, color, color, 0.0f);
-        renderer.render(entity);
+        window.setClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+        renderer.render(entity, camera);
     }
 
     @Override
diff --git a/src/main/java/com/okseby/core/utils/Transformation.java b/src/main/java/com/okseby/core/utils/Transformation.java
index fd8640e..61f50b4 100644
--- a/src/main/java/com/okseby/core/utils/Transformation.java
+++ b/src/main/java/com/okseby/core/utils/Transformation.java
@@ -1,7 +1,9 @@
 package com.okseby.core.utils;
 
+import com.okseby.core.Camera;
 import com.okseby.core.entity.Entity;
 import org.joml.Matrix4f;
+import org.joml.Vector3f;
 
 public class Transformation {
     public static Matrix4f createTransformationMatrix(Entity entity) {
@@ -15,4 +17,19 @@ public class Transformation {
 
         return matrix;
     }
+
+    public static Matrix4f getViewMatrix(Camera camera) {
+        Vector3f position = camera.getPosition();
+        Vector3f rotation = camera.getRotation();
+        Matrix4f matrix = new Matrix4f();
+
+        matrix.identity();
+        matrix.rotate((float) Math.toRadians(rotation.x), new Vector3f(1, 0, 0)).
+                rotate((float) Math.toRadians(rotation.y), new Vector3f(0, 1, 0)).
+                rotate((float) Math.toRadians(rotation.z), new Vector3f(0, 0, 1));
+
+        matrix.translate(-position.x, -position.y, -position.z);
+
+        return matrix;
+    }
 }
diff --git a/src/main/resources/shaders/vertex.vs b/src/main/resources/shaders/vertex.vs
index 73d9ef7..4ec47f0 100644
--- a/src/main/resources/shaders/vertex.vs
+++ b/src/main/resources/shaders/vertex.vs
@@ -6,8 +6,10 @@ in vec2 textureCoordinates;
 out vec2 fragmentTextureCoordinates;
 
 uniform mat4 transformationMatrix;
+uniform mat4 projectionMatrix;
+uniform mat4 viewMatrix;
 
 void main() {
-    gl_Position = transformationMatrix * vec4(position, 1.0);
+    gl_Position = projectionMatrix * viewMatrix * transformationMatrix * vec4(position, 1.0);
     fragmentTextureCoordinates = textureCoordinates;
 }
\ No newline at end of file