帧缓冲区绑定顺序

Question

我正在尝试在绘制调用之外实例化我的所有帧缓冲区。但是，如果我这样做，渲染就会出现故障。

我认为我的代码应该如何组织

framebuffer1 = createFramebuffer()
framebuffer2 = createFramebuffer()

draw(){
    bindFramebuffer(framebuffer1)
    drawScene()
    bindFramebuffer(framebuffer2)
    drawFirstPostProcess()
    bindFramebuffer(null)
    drawSecondPostProcess()
}

我当前的代码看起来如何

framebuffer1 = createFramebuffer()

draw(){
    bindFramebuffer(framebuffer1)
    drawScene()
    framebuffer2 = createFramebuffer()
    bindFramebuffer(framebuffer2)
    drawFirstPostProcess()
    bindFramebuffer(null)
    drawSecondPostProcess()
}

这是我的真实代码：（第一个post过程是景深，第二个是色差）

我如何实例化帧缓冲区 GitHub

export function createFramebuffer(gl, width, height) {
    // Framebuffer part
    const colorTexture = gl.createTexture()
    gl.bindTexture(gl.TEXTURE_2D, colorTexture)
    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_MIN_FILTER, gl.NEAREST)
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
    gl.texImage2D(
        gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE,
        null,
    )

    // Create the depth texture
    const depthTexture = gl.createTexture()
    gl.bindTexture(gl.TEXTURE_2D, depthTexture)
    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_MIN_FILTER, gl.NEAREST)
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
    gl.texImage2D(
        gl.TEXTURE_2D, 0, gl.DEPTH_COMPONENT, width, height, 0,
        gl.DEPTH_COMPONENT, gl.UNSIGNED_SHORT, null,
    )

    const buffer = gl.createFramebuffer()
    gl.bindFramebuffer(gl.FRAMEBUFFER, buffer)
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, colorTexture, 0)
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, depthTexture, 0)

    gl.bindTexture(gl.TEXTURE_2D, null)
    gl.bindFramebuffer(gl.FRAMEBUFFER, null)

    return {
        buffer,
        colorTexture,
        depthTexture,
    }
}

我绘制所有元素的主要功能 GitHub

const chromatic = new ChromaticAberration(gl)
const depth = new DepthField(gl)

const bufftex1 = createFramebuffer(gl, canvas.width, canvas.height)

GLB.animate = (time) => {
    window.requestAnimationFrame(GLB.animate)

    gl.enable(gl.DEPTH_TEST)

    gl.viewport(0.0, 0.0, canvas.width, canvas.height)

    gl.bindFramebuffer(gl.FRAMEBUFFER, bufftex1.buffer)

    gl.clear(gl.COLOR_BUFFER_BIT + gl.DEPTH_BUFFER_BIT)

    drawCubes()
    skybox.draw()

    const bufftex2 = createFramebuffer(gl, canvas.width, canvas.height)
    gl.bindFramebuffer(gl.FRAMEBUFFER, bufftex2.buffer)

    depth.draw(
        canvas.width, canvas.height, bufftex1.colorTexture, bufftex1.depthTexture,
        document,
    )

    gl.bindFramebuffer(gl.FRAMEBUFFER, null)
    gl.disable(gl.DEPTH_TEST)

    chromatic.draw(time, canvas.width, canvas.height, bufftex2.colorTexture, document)
}

更新 1

故障：

正确：

我们可以看到、移动的对象，但在 "glitchy" 版本中它们不能。浏览器没有错误。这就像帧缓冲区只有第一个绘制调用一样。

更新 2

您可以在这里找到源代码：https://github.com/ice-blaze/lilengine/tree/depth%2313 如果你想运行项目：

git clone
npm install
npm start
转到http://localhost:8080/

Answer 1

答案是：缺少 gl.clear(...)。绑定一个新的帧缓冲区后，我想做一个 clear.

是个好习惯

帧缓冲区绑定顺序

Framebuffer binding order

framebuffer

webgl