[gui] [vulkan] Surpport for getting depth information for python users.

[Morcki]

Usage:

window = ti.ui.Window("Test for getting depth buffer from ggui", (768, 768), vsync=True)
video = ti.tools.VideoManager("OutputDir")

while window.running:
    render_scene()
    # Here depth is a numpy array with shape equals (768, 768)
    depth = window.get_depth_buffer_as_numpy()
    video.write_frame(depth)
    window.show()

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[YuCrazing]

LGTM!

[PENGUINLIONG]

I wonder if it's possible to render world depth directly to the alpha channel?

[Morcki]

#5410 (comment)

Usually, the depth bit depth is 24 bit or 32 bit. If stored to the alpha channel(8-bit generally), the precise of depth information may not enough for rendering and there will be potential visual bugs especially for complicate scene. (such as shadowing, occlusion information between objects).