//displayFramebuffer & displayFramebufferTexture declared as global variables
displayFramebuffer = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, displayFramebuffer);
displayFramebuffer.width  = window.innerWidth;
displayFramebuffer.height = window.innerHeight;

displayFramebufferTexture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, displayFramebufferTexture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);

gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, displayFramebuffer.width, displayFramebuffer.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);


var renderbuffer = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, displayFramebuffer.width, displayFramebuffer.height);

gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, displayFramebufferTexture, 0);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, renderbuffer);

gl.bindTexture(gl.TEXTURE_2D, null);
gl.bindRenderbuffer(gl.RENDERBUFFER, null);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);

gl.enable(gl.DEPTH_TEST);
gl.clearColor(0.0, 0.0, 0.3, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);

gl.bindFramebuffer(gl.FRAMEBUFFER, displayFramebuffer);
gl.useProgram(Program);
//draw scene


gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.useProgram(finalProgram);
//enable arrays & uniforms


        gl.activeTexture(gl.TEXTURE0);
    gl.bindTexture(gl.TEXTURE_2D, displayFramebufferTexture);
gl.uniform1i(finalProgram.texture, 0);


gl.drawArrays(gl.TRIANGLES, 0, 6);