Render a texture on a quad

client/src/main/java/core/engine/Engine.java

@@ -1,7 +1,9 @@
 package core.engine;
 
 import core.engine.model.RawModel;
+import core.engine.model.TexturedModel;
 import core.engine.shader.StaticShader;
+import core.engine.textures.ModelTexture;
 import org.lwjgl.Version;
 import org.lwjgl.glfw.GLFWErrorCallback;
 import org.lwjgl.glfw.GLFWVidMode;
@@ -114,13 +116,23 @@ public class Engine {
                 0,1,3,
                 3,1,2
         };
-        RawModel model = loader.loadToVAO(vertices, indices);
+
+        float[] textureCoords = {
+                0,0, // V0
+                0,1, // V1
+                1,1, // V2
+                1,0  // V3
+
+        };
+        RawModel model = loader.loadToVAO(vertices,textureCoords,  indices);
+        ModelTexture modelTexture = new ModelTexture(loader.loadTexture("test_texture"));
+        TexturedModel texturedModel = new TexturedModel(model, modelTexture);
         // Run the rendering loop until the user has attempted to close
         // the window or has pressed the ESCAPE key.
         while ( !glfwWindowShouldClose(window) ) {
             renderer.prepare();
             shader.start();
-            renderer.render(model);
+            renderer.render(texturedModel);
             shader.stop();
             glfwSwapBuffers(window); // swap the color buffers
 

client/src/main/java/core/engine/Loader.java

@@ -1,6 +1,7 @@
 package core.engine;
 
 import core.engine.model.RawModel;
+import core.engine.textures.Texture;
 import org.lwjgl.BufferUtils;
 import org.lwjgl.opengl.GL11;
 import org.lwjgl.opengl.GL15;
@@ -16,16 +17,24 @@ public class Loader {
 
     private List<Integer> vaos = new ArrayList<>();
     private List<Integer> vbos = new ArrayList<>();
+    private List<Integer> textureIDs = new ArrayList<>();
 
-    public RawModel loadToVAO(float[] positions, int[] indices) {
+    public RawModel loadToVAO(float[] positions, float[] textureCoords,  int[] indices) {
         int vaoID = createVAO();
         bindIndicesBuffer(indices);
-        storeDataInAttributeList(0, positions);
-
+        storeDataInAttributeList(0, 3,positions);
+        storeDataInAttributeList(1, 2, textureCoords);
         unbindVAO();
         return new RawModel(vaoID, indices.length);
     }
 
+    public int loadTexture(String fileName) {
+        Texture texture = new Texture("res/textures/" + fileName + ".png");
+        int textureID = texture.getTextureID();
+        this.textureIDs.add(textureID);
+        return textureID;
+    }
+
     private int createVAO() {
         int vao = GL30.glGenVertexArrays();
         vaos.add(vao);
@@ -33,13 +42,13 @@ public class Loader {
         return vao;
     }
 
-    private void storeDataInAttributeList(int attributeNumber, float[] data) {
+    private void storeDataInAttributeList(int attributeNumber, int coordinateSize, float[] data) {
         int vboID = GL15.glGenBuffers();
         vbos.add(vboID);
         GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboID);
         FloatBuffer floatBuffer = storeInFloatBuffer(data);
         GL15.glBufferData(GL15.GL_ARRAY_BUFFER, floatBuffer, GL15.GL_STATIC_DRAW);
-        GL20.glVertexAttribPointer(attributeNumber, 3, GL11.GL_FLOAT, false, 0,0);
+        GL20.glVertexAttribPointer(attributeNumber, coordinateSize, GL11.GL_FLOAT, false, 0,0);
         GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
     }
 
@@ -80,5 +89,9 @@ public class Loader {
         for(int vbo: vbos) {
             GL15.glDeleteBuffers(vbo);
         }
+
+        for(int textureID: textureIDs) {
+            GL11.glDeleteTextures(textureID);
+        }
     }
 }

client/src/main/java/core/engine/Renderer.java

@@ -1,7 +1,9 @@
 package core.engine;
 
 import core.engine.model.RawModel;
+import core.engine.model.TexturedModel;
 import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL13;
 import org.lwjgl.opengl.GL20;
 import org.lwjgl.opengl.GL30;
 
@@ -14,11 +16,16 @@ public class Renderer {
         GL11.glClearColor(1,0,0,1);
     }
 
-    public void render(RawModel rawModel) {
+    public void render(TexturedModel texturedModel) {
+        RawModel rawModel = texturedModel.getRawModel();
         GL30.glBindVertexArray(rawModel.getVaoID());
         GL20.glEnableVertexAttribArray(0);
+        GL20.glEnableVertexAttribArray(1);
+        GL13.glActiveTexture(GL13.GL_TEXTURE0);
+        GL11.glBindTexture(GL11.GL_TEXTURE_2D, texturedModel.getModelTexture().getTextureID());
         GL11.glDrawElements(GL11.GL_TRIANGLES, rawModel.getVertexCount(), GL11.GL_UNSIGNED_INT, 0);
         GL20.glDisableVertexAttribArray(0);
+        GL20.glDisableVertexAttribArray(1);
         GL30.glBindVertexArray(0);
     }
 }

client/src/main/java/core/engine/model/TexturedModel.java

@@ -0,0 +1,22 @@
+package core.engine.model;
+
+import core.engine.textures.ModelTexture;
+
+public class TexturedModel {
+
+    private RawModel rawModel;
+    private ModelTexture modelTexture;
+
+    public TexturedModel(RawModel rawModel, ModelTexture modelTexture) {
+        this.rawModel = rawModel;
+        this.modelTexture = modelTexture;
+    }
+
+    public RawModel getRawModel() {
+        return rawModel;
+    }
+
+    public ModelTexture getModelTexture() {
+        return modelTexture;
+    }
+}

client/src/main/java/core/engine/shader/StaticShader.java

@@ -11,5 +11,6 @@ public class StaticShader extends ShaderProgram{
     @Override
     protected void bindAttributes() {
         super.bindAttribute(0, "position");
+        super.bindAttribute(1, "textureCoords");
     }
 }

client/src/main/java/core/engine/shader/fragmentShader.glsl

@@ -1,9 +1,11 @@
 #version 400 core
 
-in vec3 color;
+in vec2 pass_textureCoords;
 
 out vec4 out_Color;
 
+uniform sampler2D textureSampler;
+
 void main(void) {
-    out_Color = vec4(color, 1.0);
+    out_Color = texture(textureSampler, pass_textureCoords);
 }

client/src/main/java/core/engine/shader/vertexShader.glsl

@@ -1,11 +1,11 @@
 #version 400 core
 
 in vec3 position;
+in vec2 textureCoords;
 
-out vec3 color;
+out vec2 pass_textureCoords;
 
 void main(void) {
     gl_Position = vec4(position, 1.0);
-    color = vec3(position.x+0.5, 1.0, position.y+0.5);
-
+    pass_textureCoords = textureCoords;
 }

client/src/main/java/core/engine/textures/ModelTexture.java

@@ -0,0 +1,14 @@
+package core.engine.textures;
+
+public class ModelTexture {
+
+    private int textureID;
+
+    public ModelTexture(int textureID) {
+        this.textureID = textureID;
+    }
+
+    public int getTextureID() {
+        return textureID;
+    }
+}

client/src/main/java/core/engine/textures/Texture.java

@@ -0,0 +1,70 @@
+package core.engine.textures;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.IntBuffer;
+
+import static org.lwjgl.opengl.GL11.*;
+
+public class Texture {
+
+    private int width, height;
+    private int texture;
+
+    public Texture(String path) {
+        texture = load(path);
+    }
+
+    private int load(String path) {
+        int[] pixels = null;
+        try {
+            BufferedImage image = ImageIO.read(new FileInputStream(path));
+            width = image.getWidth();
+            height = image.getHeight();
+            pixels = new int[width * height];
+            image.getRGB(0, 0, width, height, pixels, 0, width);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        int[] data = new int[width * height];
+        for (int i = 0; i < width * height; i++) {
+            int a = (pixels[i] & 0xff000000) >> 24;
+            int r = (pixels[i] & 0xff0000) >> 16;
+            int g = (pixels[i] & 0xff00) >> 8;
+            int b = (pixels[i] & 0xff);
+
+            data[i] = a << 24 | b << 16 | g << 8 | r;
+        }
+
+        int result = glGenTextures();
+        glBindTexture(GL_TEXTURE_2D, result);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+        IntBuffer buffer = ByteBuffer.allocateDirect(data.length << 2)
+                .order(ByteOrder.nativeOrder()).asIntBuffer();
+        buffer.put(data).flip();
+
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
+                GL_UNSIGNED_BYTE, buffer);
+        glBindTexture(GL_TEXTURE_2D, 0);
+        return result;
+    }
+
+    public void bind() {
+        glBindTexture(GL_TEXTURE_2D, texture);
+    }
+
+    public void unbind() {
+        glBindTexture(GL_TEXTURE_2D, 0);
+    }
+
+    public int getTextureID() {
+        return texture;
+    }
+}