FrameBuffer

public class FrameBuffer {

    public FrameBuffer(int width, int height, boolean hasDepth, boolean hasStencil) {
        this.width = width;
        this.height = height;

        if ((width + height) % 4 != 0) {
            new Exception("Width + Height must be divisible by 4");
        }

        colorTexture = GL11.glGenTextures();
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, colorTexture);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST);

        GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA8, width, height, 0, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, (ByteBuffer)null);

        frameBufferID = GL30.glGenFramebuffers();
        GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, frameBufferID);
        GL30.glFramebufferTexture2D(GL30.GL_FRAMEBUFFER, GL30.GL_COLOR_ATTACHMENT0, GL11.GL_TEXTURE_2D, colorTexture, 0);

        if (hasDepth && hasStencil) {
            int depthAndStencilBufferID = GL30.glGenRenderbuffers();
            GL30.glBindRenderbuffer(GL30.GL_RENDERBUFFER, depthAndStencilBufferID);
            GL30.glRenderbufferStorage(GL30.GL_RENDERBUFFER, GL30.GL_DEPTH24_STENCIL8, width, height);
            GL30.glFramebufferRenderbuffer(GL30.GL_FRAMEBUFFER, GL30.GL_DEPTH_STENCIL_ATTACHMENT, GL30.GL_RENDERBUFFER, depthAndStencilBufferID);
        }

        else if (hasDepth) {
            int depthBufferID = GL30.glGenRenderbuffers();
            GL30.glBindRenderbuffer(GL30.GL_RENDERBUFFER, depthBufferID);
            GL30.glRenderbufferStorage(GL30.GL_RENDERBUFFER, GL30.GL_DEPTH_COMPONENT32F, width, height);
            GL30.glFramebufferRenderbuffer(GL30.GL_FRAMEBUFFER, GL30.GL_DEPTH_ATTACHMENT, GL30.GL_RENDERBUFFER, depthBufferID);
        }

        else if (hasStencil) {
            int stencilBufferID = GL30.glGenRenderbuffers();
            GL30.glBindRenderbuffer(GL30.GL_RENDERBUFFER, stencilBufferID);
            GL30.glRenderbufferStorage(GL30.GL_RENDERBUFFER, GL30.GL_STENCIL_INDEX16, width, height);
            GL30.glFramebufferRenderbuffer(GL30.GL_FRAMEBUFFER, GL30.GL_STENCIL_ATTACHMENT, GL30.GL_RENDERBUFFER, stencilBufferID);
        }

        int result = GL30.glCheckFramebufferStatus(GL30.GL_FRAMEBUFFER);
        if (result != GL30.GL_FRAMEBUFFER_COMPLETE) {
            if (result == GL30.GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT) {
                new Exception("Frame Buffer Error: incomplete attachment").printStackTrace();
            }
            if (result == GL30.GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER) {
                new Exception("Frame Buffer Error: incomplete draw buffer").printStackTrace();
            }
            if (result == GL30.GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT) {
                new Exception("Frame Buffer Error: missing attachment").printStackTrace();
            }
            if (result == GL30.GL_FRAMEBUFFER_UNSUPPORTED) {
                new Exception("Frame Buffer Error: unsupported combination of formats").printStackTrace();
            }
            if (result == GL30.GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE) {
                new Exception("Frame Buffer Error: incomplete multisample").printStackTrace();
            }
            if (result == GL30.GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER) {
                new Exception("Frame Buffer Error: incomplete read buffer").printStackTrace();
            }

            new Exception("frame buffer couldn't be constructed: unknown error " + result).printStackTrace();
        }
        GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, 0);
    }

    private int colorTexture;

    private int width, height;
    private int frameBufferID;

    public void begin () {
        GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, frameBufferID);
        GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT | GL11.GL_STENCIL_BUFFER_BIT);
        GL11.glViewport(0, 0, width, height);
    }

    public void end () {
        GL11.glViewport(0, 0, RenderingEngine.getWidth(), RenderingEngine.getHeight());
        GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, 0);
    }

    public int getColorTexture () {
        return colorTexture;
    }

    public int getWidth () {
        return width;
    }

    public int getHeight () {
        return height;
    }

}