LWJGL glDrawArrays doesn't draw - lwjgl

Question

I'm kinda new to the LWJGL library and im trying to draw a simple triangle. Only my code seems okay with it won't draw my triangle. It also gives no errors or anything else. I searched everywhere but found no solution at all. Anyone with a solution?
Code:
public class Cube {
private int width, height;
private int ID, bufferID;
private int count;
private float[] vertices;
public Cube() {
vertices = new float[] {
0, 0, 0,
1, 0, 0,
0, 1, 0,
};
count = vertices.length / 3;
FloatBuffer buffer = BufferUtils.createFloatBuffer(vertices.length);
buffer.put(vertices);
buffer.flip();
ID = GL30.glGenVertexArrays();
GL30.glBindVertexArray(ID);
bufferID = GL15.glGenBuffers();
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, bufferID);
GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW);
GL20.glEnableVertexAttribArray(0);
GL20.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, 0, 0);
GL30.glBindVertexArray(0);
GL20.glDisableVertexAttribArray(0);
}
public void render() {
GL30.glBindVertexArray(ID);
GL11.glDrawArrays(GL11.GL_TRIANGLES, 0, count);
GL30.glBindVertexArray(0);
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
}
public class Launcher {
public static void main(String[] args) {
Window window = new Window("Cube Wave", 800, 600);
window.setBackground(1, 0, 1);
window.setup();
}
}
public class Window {
private String title;
private int width, height;
private Vector3f color;
private long window;
private ArrayList<Cube> cubes = new ArrayList<Cube>();
public Window(String title, int width, int height) {
this.title = title;
this.width = width;
this.height = height;
setBackground(0, 0, 0);
}
public void setup() {
if (!glfwInit()) {
return;
}
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
window = glfwCreateWindow(width, height, title, NULL, NULL);
if (window == NULL) {
return;
}
GLFWVidMode monitor = glfwGetVideoMode(glfwGetPrimaryMonitor());
glfwSetWindowPos(window, (monitor.width() - width) / 2, (monitor.height() - height) / 2);
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
GL.createCapabilities();
glfwShowWindow(window);
loop();
}
public long getWindow() {
return window;
}
public void loop() {
init();
glClearColor(color.x, color.y, color.z, 1.0f);
while(!closed()) {
tick();
render();
}
}
public void render() {
for(Cube cube : cubes) {
cube.render();
}
glfwSwapBuffers(window);
}
public void tick() {
glfwPollEvents();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
public void init() {
cubes.add(new Cube());
}
public boolean closed() {
return glfwWindowShouldClose(window);
}
public void setBackground(float r, float g, float b) {
color = new Vector3f(r, g, b);
}
}

Answer 1

It seems that you have a mistake in your render function.
Below is an example for how to use glDrawArrays in a render function.
public void render() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
// bind the VBO and enable the attribute
GL30.glBindVertexArray(ID);
GL20.glEnableVertexAttribArray(0);
GL11.glDrawArrays(GL11.GL_TRIANGLES, 0, count);
// disable the VBO and disable the attribute
GL20.glDisableVertexAttribArray(0);
GL30.glBindVertexArray(0);
}
Also it is considered best practice to unbind buffers when you are done with them. So your initialization function should look like this.
public Cube() {
// ... vertex stuff
ID = GL30.glGenVertexArrays();
GL30.glBindVertexArray(ID);
bufferID = GL15.glGenBuffers();
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, bufferID);
GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW);
GL20.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, 0, 0);
// unbind both the Array Buffer and the Vertex Array
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
GL30.glBindVertexArray(0);
}
You can find a more in depth discussion and example of this from the lwjgl wiki