Frame Buffer

package engine.renderer;

import java.nio.ByteBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL14;
import org.lwjgl.opengl.GL30;
import org.lwjgl.opengl.GL32;

import engine.MainGameLoop;
import engine.geometry.BasicShapes;

public class FrameBuffer {

    private int quadVAO;

    private int fbo;
    private int colorTextureID;
    private int depthTextureID;

    private int textureWidth;
    private int textureHeight;

    public FrameBuffer(int w, int h){
        quadVAO = MainGameLoop.theLoader.loadToVAO(BasicShapes.QUAD_VERTICES, BasicShapes.QUAD_TEXTURE_COORDS);
        textureWidth = w;
        textureHeight = h;
        fbo = createFrameBuffer();
        colorTextureID = createColorTextureAttachment(textureWidth, textureHeight);
        depthTextureID = createDepthTextureAttachment(textureWidth, textureHeight);
    }

    public int getColorTexture(){
        return colorTextureID;
    }

    public int getDepthTexure(){
        return depthTextureID;
    }

    public int getQuadVAO(){
        return quadVAO;
    }

    private int createFrameBuffer(){
        int frameBuffer = GL30.glGenFramebuffers();
        GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, frameBuffer);
        GL11.glDrawBuffer(GL30.GL_COLOR_ATTACHMENT0);
        return frameBuffer;
    }

    private int createColorTextureAttachment(int width, int height) {
        int texture = GL11.glGenTextures();
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture);
        //HDR rendering: GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB16, width, height, 0, GL11.GL_RGBA, GL11.GL_FLOAT, (ByteBuffer) null);
        //Normal rendering: GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, width, height, 0, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, (ByteBuffer) null);
        GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB16, width, height, 0, GL11.GL_RGBA, GL11.GL_FLOAT, (ByteBuffer) null);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
        GL32.glFramebufferTexture(GL30.GL_FRAMEBUFFER, GL30.GL_COLOR_ATTACHMENT0, texture, 0);
        return texture;
    }

    private int createDepthTextureAttachment(int width, int height){
        int texture = GL11.glGenTextures();
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture);
        GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL14.GL_DEPTH_COMPONENT32, width, height, 0, GL11.GL_DEPTH_COMPONENT, GL11.GL_FLOAT, (ByteBuffer) null);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
        GL32.glFramebufferTexture(GL30.GL_FRAMEBUFFER, GL30.GL_DEPTH_ATTACHMENT, texture, 0);
        return texture;
    }

    public void bindFrameBuffer(){
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
        GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, fbo);
        GL11.glViewport(0, 0, textureWidth, textureHeight);
    }

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

    public void cleanUp(){
        GL30.glDeleteFramebuffers(fbo);
        GL11.glDeleteTextures(colorTextureID);
        GL11.glDeleteTextures(depthTextureID);
    }
}