c++ - 在帧缓冲区内渲染多采样和单采样纹理

Question

我正在尝试同时渲染多重采样和单采样纹理(drawcall)。我为什么要那个？因为多采样纹理使用抗锯齿，而单采样纹理用于颜色选择。两个纹理(nRenderTargetTexture 和 nColorPickingTexture)具有相同的大小。如果我运行下面的代码，它会在 GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE 情况下失败。是否可以同时渲染成多重采样和单采样纹理？

顺便说一句:我也在使用 glGetError()，但它返回 GL_NO_ERROR

// Enable multisampling
glEnable(GL_MULTISAMPLE);

glGenFramebuffers(1, pFramebufferID);
glBindFramebuffer(GL_FRAMEBUFFER, *pFramebufferID);

// Create color render buffer
glGenRenderbuffers(1, &nColorBuffer);
glBindRenderbuffer(GL_RENDERBUFFER, nColorBuffer);
glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4, GL_RGBA8, nWidth, nHeight);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, nColorBuffer);

// Create depth render buffer
glGenRenderbuffers(1, &nDepthBuffer);
glBindRenderbuffer(GL_RENDERBUFFER, nDepthBuffer);
glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4, GL_DEPTH24_STENCIL8, nWidth, nHeight);

//Attach the multisampled textures
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, nDepthBuffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, nDepthBuffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, nRenderTargetTexture, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, nColorPickingTexture, 0);
const GLenum draw_buffers[] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};

glDrawBuffers(2, draw_buffers);

GLenum eFramebufferOk = glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER);

bool bResult = false;
switch (eFramebufferOk)
{
    case GL_FRAMEBUFFER_UNDEFINED:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_UNSUPPORTED:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
    case GL_FRAMEBUFFER_COMPLETE:
    {
        bResult = true;
    }
    break;
    default:
    {
        DebugAssertOnce(CREATE_FRAME_BUFFER_FAILED);
    }
    break;
}

非常感谢!

Answer 1

Is it posible to render into multisampled and singlesampled textures at the same time?

没有。附加到帧缓冲区的所有图像必须具有相同的样本数。否则，您将得到 GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE。