43 lines
1.6 KiB
GDScript3
43 lines
1.6 KiB
GDScript3
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extends ColorRect
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# #125: drives breach.gdshader.
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#
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# Lives in the UI layer because it works in SCREEN space - it bends the
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# rendered frame, so it has to be the last thing drawn and it has to cover
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# the whole viewport. The world-space half of the breach (the horizon, the
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# accretion disc, the infalling matter) is DimensionalBreach, a Node2D out
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# in the world; this is only the lens over the top of it.
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#
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# Inert unless something calls set_breach(): the shader is a no-op at zero
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# strength, but a full-screen quad that is never needed is still a full
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# screen of fragment work, so it hides itself instead.
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const SHADER_PATH: String = "res://shaders/breach.gdshader"
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func _ready() -> void:
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mouse_filter = Control.MOUSE_FILTER_IGNORE
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visible = false
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if material == null:
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var shader_material := ShaderMaterial.new()
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shader_material.shader = load(SHADER_PATH)
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material = shader_material
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func clear_breach() -> void:
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visible = false
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if material != null:
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material.set_shader_parameter("strength", 0.0)
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# `at` is in SCREEN pixels; the director projects the world point through the
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# camera before calling, because only it knows where the camera is.
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func set_breach(at: Vector2, horizon: float, lens: float, breach_strength: float) -> void:
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if material == null:
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return
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visible = breach_strength > 0.001
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material.set_shader_parameter("breach_center", at)
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material.set_shader_parameter("viewport_size", size)
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material.set_shader_parameter("horizon_radius", horizon)
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material.set_shader_parameter("lens_radius", maxf(lens, horizon + 1.0))
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material.set_shader_parameter("strength", clampf(breach_strength, 0.0, 1.0))
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