[DEV] tutorial 24 'render GUI' implementation

src/engineTester/MainGameLoop.java

@@ -5,6 +5,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
 
+import org.atriaSoft.etk.math.Vector2f;
 import org.atriaSoft.etk.math.Vector3f;
 import org.lwjgl.openvr.Texture;
 
@@ -12,6 +13,8 @@ import entities.Camera;
 import entities.Entity;
 import entities.Light;
 import entities.Player;
+import guis.GuiRenderer;
+import guis.GuiTexture;
 import models.RawModel;
 import models.TexturedModel;
 import renderEngine.DisplayManager;
@@ -111,15 +114,22 @@ public class MainGameLoop {
 
 		Camera camera = new Camera(player);
 		
+		
+		List<GuiTexture> guis = new ArrayList<GuiTexture>();
+		GuiTexture gui = new GuiTexture(loader.loadTexture("socuwan"), new Vector2f(0.5f, 0.5f), new Vector2f(0.25f, 0.25f));
+		guis.add(gui);
+		
+		GuiRenderer guiRenderer = new GuiRenderer(loader);
 		MasterRenderer renderer = new MasterRenderer();
+		
 		manager.setDrawer(new DisplayManagerDraw() {
 			@Override
 			public void draw() {
 				//entity.increasePosition(0.0f, 0, -0.01f);
 				//entity.increaseRotation(0, 0, 0.01f);
 				//entity.increaseRotation(0.01f, 0.02f, 0.0f);
-				camera.move();
 				player.move(terrain);
+				camera.move();
 				renderer.processTerrain(terrain);
 				renderer.processEntity(player);
 				for (Entity entity : entities) {
@@ -127,9 +137,11 @@ public class MainGameLoop {
 					renderer.processEntity(entity);
 				}
 				renderer.render(light, camera);
-			}
+				guiRenderer.render(guis);
+			} 
 		});
 		manager.loop();
+		guiRenderer.cleanUp();
 		renderer.cleanUp();
 		loader.cleanUp();
 		manager.unInit();

src/guis/GuiRenderer.java

@@ -0,0 +1,52 @@
+package guis;
+
+import java.util.List;
+
+import org.atriaSoft.etk.math.Matrix4f;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL13;
+import org.lwjgl.opengl.GL20;
+import org.lwjgl.opengl.GL30;
+
+import models.RawModel;
+import renderEngine.Loader;
+import toolbox.Maths;
+
+public class GuiRenderer {
+
+	private final RawModel quad;
+	private GuiShader shader;
+
+	public GuiRenderer(Loader loader) {
+		 float[] positions = {-1, 1, -1, -1, 1, 1, 1, -1};
+		 quad = loader.loadToVAO(positions);
+		 shader = new GuiShader();
+	}
+	public void render(List<GuiTexture> guis) {
+		shader.start();
+		//System.out.println("Render Gui " + guis.size());
+		GL30.glBindVertexArray(quad.getVaoID());
+		GL20.glEnableVertexAttribArray(0);
+		GL11.glEnable(GL11.GL_BLEND);
+		GL11.glBlendFunc(GL11.GL_SRC_ALPHA,  GL11.GL_ONE_MINUS_SRC_ALPHA);
+		GL11.glDisable(GL11.GL_DEPTH_TEST);
+		for (GuiTexture gui: guis) {
+			GL13.glActiveTexture(GL13.GL_TEXTURE0);
+			GL11.glBindTexture(GL11.GL_TEXTURE_2D, gui.getTexture());
+			Matrix4f matrix = Maths.createTransformationMatrix(gui.getPosition(), gui.getScale());
+			shader.loadTransformation(matrix);
+			GL11.glDrawArrays(GL11.GL_TRIANGLE_STRIP, 0, quad.getVertexCount());
+			
+		}
+		GL11.glDisable(GL11.GL_BLEND);
+		GL11.glEnable(GL11.GL_DEPTH_TEST);
+		GL20.glDisableVertexAttribArray(0);	
+		GL30.glBindVertexArray(0);
+		shader.stop();
+	}
+	
+	public void cleanUp() {
+		shader.cleanUp();
+	}
+	
+}

src/guis/GuiShader.java

@@ -0,0 +1,35 @@
+package guis;
+
+import org.atriaSoft.etk.math.Matrix4f;
+
+import shaders.ShaderProgram;
+
+public class GuiShader extends ShaderProgram {
+	
+	private static final String VERTEX_FILE = "src/guis/guiVertexShader.txt";
+	private static final String FRAGMENT_FILE = "src/guis/guiFragmentShader.txt";
+	
+	private int location_transformationMatrix;
+
+	public GuiShader() {
+		super(VERTEX_FILE, FRAGMENT_FILE);
+	}
+	
+	public void loadTransformation(Matrix4f matrix){
+		super.loadMatrix(location_transformationMatrix, matrix);
+	}
+
+	@Override
+	protected void getAllUniformLocations() {
+		location_transformationMatrix = super.getUniformLocation("transformationMatrix");
+	}
+
+	@Override
+	protected void bindAttributes() {
+		super.bindAttribute(0, "position");
+	}
+	
+	
+	
+
+}

src/guis/GuiTexture.java

@@ -0,0 +1,33 @@
+package guis;
+
+import org.atriaSoft.etk.math.Vector2f;
+
+public class GuiTexture {
+	private int texture;
+	private Vector2f position;
+	private Vector2f scale;
+	public GuiTexture(int texture, Vector2f position, Vector2f scale) {
+		this.texture = texture;
+		this.position = position;
+		this.scale = scale;
+	}
+	public int getTexture() {
+		return texture;
+	}
+	public void setTexture(int texture) {
+		this.texture = texture;
+	}
+	public Vector2f getPosition() {
+		return position;
+	}
+	public void setPosition(Vector2f position) {
+		this.position = position;
+	}
+	public Vector2f getScale() {
+		return scale;
+	}
+	public void setScale(Vector2f scale) {
+		this.scale = scale;
+	}
+	
+}

src/guis/guiFragmentShader.txt

@@ -0,0 +1,11 @@
+#version 400 core
+
+in vec2 textureCoords;
+
+out vec4 out_Color;
+
+uniform sampler2D guiTexture;
+
+void main(void){
+	out_Color = texture(guiTexture,textureCoords);
+}

src/guis/guiVertexShader.txt

@@ -0,0 +1,13 @@
+#version 400 core
+
+in vec2 position;
+
+out vec2 textureCoords;
+
+uniform mat4 transformationMatrix;
+
+void main(void){
+
+	gl_Position = transformationMatrix * vec4(position, 0.0, 1.0);
+	textureCoords = vec2((position.x+1.0)/2.0, 1 - (position.y+1.0)/2.0);
+}

src/renderEngine/Loader.java

@@ -50,8 +50,17 @@ public class Loader {
 		return new RawModel(vaoID, indices.length);
 	}
 	
+	public RawModel loadToVAO(float[] positions) {
+		int vaoID = createVAO();
+		this.storeDataInAttributeList(0, 2, positions);
+		unbindVAO();
+		return new RawModel(vaoID, positions.length/2);
+	}
+	
 	public int loadTexture(String filename) {
-		int textureId = loadPNGTexture("res/" + filename + ".png", GL13.GL_TEXTURE0);
+		String fullname = "res/" + filename + ".png";
+		System.out.println("Load texture : " + fullname);
+		int textureId = loadPNGTexture(fullname, GL13.GL_TEXTURE0);
 		this.textures.add(textureId);
 		return textureId;
 	}

src/toolbox/Maths.java

@@ -38,4 +38,11 @@ public class Maths {
 		matrix.translate(new Vector3f(-camarePos.x,-camarePos.y,-camarePos.z));
 		return matrix;
 	}
+	public static Matrix4f createTransformationMatrix(Vector2f translation, Vector2f scale) {
+		Matrix4f matrix = new Matrix4f();
+		matrix.setIdentity();
+		matrix.translate(new Vector3f(translation.x, translation.y, 0));
+		matrix.scale(new Vector3f(scale.x, scale.y, 1f));
+		return matrix;
+	}
 }