# Update the depth texture from the light point of view
	#
	# This method updates `shadow_context.depth_texture`.
	protected fun frame_core_shadow_prep(display: GamnitDisplay)
	do
		if not supports_shadows then return

		var light = app.light
		if not light isa LightCastingShadows then return

		# Make sure there's no errors pending
		assert glGetError == gl_NO_ERROR

		# Bind the framebuffer and make sure it is OK
		glBindFramebuffer(gl_FRAMEBUFFER, shadow_context.light_view_framebuffer)
		assert glGetError == gl_NO_ERROR
		assert glCheckFramebufferStatus(gl_FRAMEBUFFER) == gl_FRAMEBUFFER_COMPLETE

		# Draw to fill the depth texture and only the depth
		glViewport(0, 0, shadow_resolution, shadow_resolution)
		glColorMask(false, false, false, false)
		glClear gl_COLOR_BUFFER_BIT | gl_DEPTH_BUFFER_BIT
		assert glGetError == gl_NO_ERROR

		# Update light position
		var camera = light.camera
		camera.position.x = app.world_camera.position.x
		camera.position.y = app.world_camera.position.y
		camera.position.z = app.world_camera.position.z

		# Draw all actors
		for actor in actors do
			for leaf in actor.model.leaves do
				leaf.material.draw_depth(actor, leaf, camera)
			end
		end

		# Take down, bring back default values
		bind_screen_framebuffer shadow_context.screen_framebuffer
		glColorMask(true, true, true, true)
	end