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import bpy
import gpu

def draw():
    global to_draw
    
    if to_draw:
        framebuffer = gpu.state.active_framebuffer_get()

        viewport_info = gpu.state.viewport_get()
        width = viewport_info[2]
        height = viewport_info[3]

        framebuffer_image.scale(width, height)
        
        pixelBuffer = framebuffer.read_color(0, 0, width, height, 4, 0, 'FLOAT')
        
        pixelBuffer.dimensions = width * height * 4
        framebuffer_image.pixels.foreach_set(pixelBuffer)
        to_draw=False

if __name__ == "__main__":

    global to_draw
    to_draw=False
    
    if "color_buffer_copy" in bpy.data.images:
        framebuffer_image = bpy.data.images["color_buffer_copy"]
    else:
        framebuffer_image = bpy.data.images.new("color_buffer_copy" , 32, 32, float_buffer=True)
    
    bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'PRE_VIEW')
    
    bpy.data.objects['Cube'].rotation_euler[0] = 1.5
    to_draw=True