Projection Matrix

Rendr/out/production/Rendr/Shaders/vertexShader.glsl

@@ -7,9 +7,10 @@ out vec3 color;
 out vec2 passUvs;
 
 uniform mat4 transformationMatrix;
+uniform mat4 projectionMatrix;
 
 void main(void)
 {
-    gl_Position = vec4(position.x, position.y, position.z, 1.0);
+    gl_Position = projectionMatrix * transformationMatrix * vec4(position.x, position.y, position.z, 1.0);
     passUvs = uvs;
 }

Rendr/src/EngineTest/MainGameLoop.java

@@ -1,5 +1,6 @@
 package EngineTest;
 
+import Entity.Entity;
 import RenderEngine.DisplayManager;
 import RenderEngine.Loader;
 import Models.RawModel;
@@ -8,6 +9,7 @@ import Shaders.StaticShader;
 import Models.TexturedModel;
 import org.lwjgl.opengl.Display;
 import Textures.ModelTexture;
+import org.lwjgl.util.vector.Vector3f;
 
 public class MainGameLoop
 {
@@ -21,8 +23,8 @@ public class MainGameLoop
         DisplayManager.createDisplay("Rendr");
 
         Loader loader = new Loader();
-        Renderer renderer = new Renderer();
         StaticShader shader = new StaticShader();
+        Renderer renderer = new Renderer(shader);
 
         float[] vertices =
                 {
@@ -47,12 +49,13 @@ public class MainGameLoop
         RawModel model = loader.loadToVAO(vertices, indices, uvs);
         ModelTexture texture = new ModelTexture(loader.loadTexture("mossyBricks"));
         TexturedModel texturedModel = new TexturedModel(model, texture);
+        Entity entity = new Entity(texturedModel, new Vector3f(0, 0, -5), 0, 0, 0, 1);
 
         while(!Display.isCloseRequested())
         {
             renderer.prepare(0, 0, 0);
             shader.start();
-            renderer.render(texturedModel);
+            renderer.render(entity, shader);
             shader.stop();
             DisplayManager.updateDisplay();
         }

Rendr/src/Entity/Entity.java

@@ -0,0 +1,103 @@
+package Entity;
+
+import Models.TexturedModel;
+import org.lwjgl.util.vector.Vector3f;
+
+public class Entity
+{
+    private TexturedModel model;
+    private Vector3f position;
+    private float rotX, rotY, rotZ;
+    private float scale;
+
+    public Entity(TexturedModel model, Vector3f position, float rotX, float rotY, float rotZ, float scale)
+    {
+        this.model = model;
+        this.position = position;
+        this.rotX = rotX;
+        this.rotY = rotY;
+        this.rotZ = rotZ;
+        this.scale = scale;
+    }
+
+    public void translate(Vector3f value)
+    {
+        position.x += value.x;
+        position.y += value.y;
+        position.z += value.z;
+    }
+
+    public void translate(float x, float y, float z)
+    {
+        position.x += x;
+        position.y += y;
+        position.z += z;
+    }
+
+    public void rotate(float x, float y, float z)
+    {
+        rotX += x;
+        rotY += y;
+        rotZ += z;
+    }
+
+    public TexturedModel getModel()
+    {
+        return model;
+    }
+
+    public void setModel(TexturedModel model)
+    {
+        this.model = model;
+    }
+
+    public Vector3f getPosition()
+    {
+        return position;
+    }
+
+    public void setPosition(Vector3f position)
+    {
+        this.position = position;
+    }
+
+    public float getRotX()
+    {
+        return rotX;
+    }
+
+    public void setRotX(float rotX)
+    {
+        this.rotX = rotX;
+    }
+
+    public float getRotY()
+    {
+        return rotY;
+    }
+
+    public void setRotY(float rotY)
+    {
+        this.rotY = rotY;
+    }
+
+    public float getRotZ()
+    {
+        return rotZ;
+    }
+
+    public void setRotZ(float rotZ)
+    {
+        this.rotZ = rotZ;
+    }
+
+    public float getScale()
+    {
+        return scale;
+    }
+
+    public void setScale(float scale)
+    {
+        this.scale = scale;
+    }
+}

Rendr/src/RenderEngine/Renderer.java

@@ -1,28 +1,47 @@
 package RenderEngine;
 
+import Entity.Entity;
 import Models.RawModel;
 import Models.TexturedModel;
-import org.lwjgl.opengl.GL11;
-import org.lwjgl.opengl.GL13;
-import org.lwjgl.opengl.GL20;
-import org.lwjgl.opengl.GL30;
+import Shaders.StaticShader;
+import Tools.Maths;
+import org.lwjgl.opengl.*;
+import org.lwjgl.util.vector.Matrix4f;
 
 public class Renderer
 {
+    private static final float fov = 70;
+    private static final float nearPlane = .1f;
+    private static final float farPlane = 1000;
+
+    private Matrix4f projectionMatrix;
+
+    public Renderer(StaticShader shader)
+    {
+        createProjectionMatrix();
+        shader.start();
+        shader.loadProjectionMatrix(projectionMatrix);
+        shader.stop();
+    }
+
     public void prepare(float r, float g, float b)
     {
         GL11.glClearColor(r, g, b, 1);
         GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
     }
 
-    public void render(TexturedModel texturedModel)
+    public void render(Entity entity, StaticShader shader)
     {
+        TexturedModel texturedModel = entity.getModel();
         RawModel model = texturedModel.getRawModel();
         //bind the models vao
         GL30.glBindVertexArray(model.getVaoID());
         //vertex data is in list 0
         GL20.glEnableVertexAttribArray(0);
         GL20.glEnableVertexAttribArray(1);
+        Matrix4f transform = Maths.createTransformMatrix(entity.getPosition(), entity.getRotX(), entity.getRotY(), entity.getRotZ(), entity.getScale());
+
+        shader.loadTransformMatrix(transform);
 
         GL13.glActiveTexture(GL13.GL_TEXTURE0);
         GL11.glBindTexture(GL11.GL_TEXTURE_2D, texturedModel.getTexture().getID());
@@ -34,4 +53,20 @@ public class Renderer
         GL20.glDisableVertexAttribArray(1);
         GL30.glBindVertexArray(0);
     }
+
+    private void createProjectionMatrix()
+    {
+        float aspectRatio = (float) Display.getWidth() / (float) Display.getHeight();
+        float yScale = (float) ((1f / Math.tan(Math.toRadians(fov / 2f))) * aspectRatio);
+        float xScale = yScale / aspectRatio;
+        float frustumLength = farPlane - nearPlane;
+
+        projectionMatrix = new Matrix4f();
+        projectionMatrix.m00 = xScale;
+        projectionMatrix.m11 = yScale;
+        projectionMatrix.m22 = -((farPlane + nearPlane) / frustumLength);
+        projectionMatrix.m23 = -1;
+        projectionMatrix.m32 = -((2 * nearPlane * farPlane) / frustumLength);
+        projectionMatrix.m33 = 0;
+    }
 }

Rendr/src/Shaders/StaticShader.java

@@ -6,6 +6,7 @@ public class StaticShader extends ShaderProgram
 {
     private static final String vertexFile = "src/shaders/vertexShader.glsl", fragmentFile = "src/shaders/fragmentShader.glsl";
     private int locationTransform;
+    private int locationProjection;
 
     public StaticShader()
     {
@@ -16,6 +17,7 @@ public class StaticShader extends ShaderProgram
     protected void getAllUniformLocations()
     {
         locationTransform = getUniformLocation("transformationMatrix");
+        locationProjection = getUniformLocation("projectionMatrix");
     }
 
     @Override
@@ -29,4 +31,9 @@ public class StaticShader extends ShaderProgram
     {
         loadMatrix(locationTransform, matrix);
     }
+
+    public void loadProjectionMatrix(Matrix4f matrix)
+    {
+        loadMatrix(locationProjection, matrix);
+    }
 }

Rendr/src/Shaders/vertexShader.glsl

@@ -7,9 +7,10 @@ out vec3 color;
 out vec2 passUvs;
 
 uniform mat4 transformationMatrix;
+uniform mat4 projectionMatrix;
 
 void main(void)
 {
-    gl_Position = vec4(position.x, position.y, position.z, 1.0) * transformationMatrix;
+    gl_Position = projectionMatrix * transformationMatrix * vec4(position.x, position.y, position.z, 1.0);
     passUvs = uvs;
 }