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I want to let the GPU create a mipmap for the framebuffer texture that's available as bgl_RenderedTexture in the custom filters.

It shouldn't be difficult. I just put some code into the post_draw list:

glBindTexture(GL_TEXTURE_2D, bgl_RenderedTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glGenerateMipmap(GL_TEXTURE_2D);

But there's no variable bgl_RenderedTexture. Is there a way to get the texture name for the framebuffer?

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