31 lines
871 B
GDScript
31 lines
871 B
GDScript
extends Node2D
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@onready var sim_viewport := $SubViewport
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@onready var display_sprite := $Sprite2D
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var tex_a: Texture2D
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var tex_b: Texture2D
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var swap = false
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func _ready():
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# Create textures
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tex_a = ImageTexture.create_from_image(
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Image.create(sim_viewport.size.x, sim_viewport.size.y, false, Image.FORMAT_RGBAF)
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)
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tex_b = tex_a.duplicate()
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# Assign one texture to the simulation shader as input
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$SubViewport/ColorRect.material.set("shader_parameter/trail_tex", tex_a)
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display_sprite.texture = tex_a
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func _process(_delta):
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# Swap textures each frame
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swap = !swap
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var src = tex_a if swap else tex_b
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var dst = tex_b if swap else tex_a
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# Assign src as input and dst as render target
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$SubViewport/ColorRect.material.set("shader_parameter/trail_tex", src)
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sim_viewport.render_target_update_mode = SubViewport.UPDATE_ALWAYS
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display_sprite.texture = dst
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