4ebd832a70
GasVentField called queue_redraw() every frame and its _draw rebuilt six vents of seven glowing polygons each - 168 antialiased polylines re-tessellated per frame, since every NeonDraw call expands into four. Measured first: 40 rasterisations over 30 frames, costing 6.6ms against a 32.4ms floor. For scale, the black hole's cached disc costs 0.1ms. Both halves are pieces now. The sources never move, never recolour and never fade, so they are rasterised once. The rising bubbles genuinely change size and opacity, but size is scale and opacity is modulate - neither needs the geometry rebuilding. 40 rasterisations over 30 frames became 0. Two things worth recording. The static extraction alone measured NOTHING - 7.1ms against 6.6ms, inside the noise. softpipe is a CPU rasteriser: it prices FILL, and cached geometry fills the same pixels. It cannot see a tessellation saving at all. After the full change the frame time read NEGATIVE with the floor drifting 28 to 39ms between runs, so no millisecond figure is claimed here. The rasterisation count is the reproducible result; what it is worth on a phone is unmeasured. And scaling a NeonPiece scales its STROKE with it. The bubbles were first built as unit circles scaled up by their radius, which multiplied NeonDraw's widths by five to fourteen - a hundred pixels of glow around a fourteen pixel bubble. They rendered as bright blobs, the rasterisation count said 40 -> 0, and only the screenshot disagreed. Built at the largest radius and scaled DOWN now, so the stroke only ever thins. The trap is noted at the call site: scale is safe for moving and shrinking a piece and quietly wrong for growing one. NeonPiece.add_polygon gained a width, which it needed to keep the vents' authored stroke rather than silently fattening them. 179/179. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019AJMdB7iuHuLFZM1aBu3GD
60 lines
2.3 KiB
GDScript
60 lines
2.3 KiB
GDScript
class_name NeonPiece
|
|
extends Node2D
|
|
|
|
# One movable piece of neon art, rasterised ONCE and thereafter animated
|
|
# only through node properties.
|
|
#
|
|
# Godot re-runs _draw() solely when a redraw is requested; changing
|
|
# position/rotation/scale/modulate/visible reuses the cached geometry
|
|
# instead. Since every NeonDraw call expands into four antialiased
|
|
# polylines, redrawing a shape each frame just to move or fade it is the
|
|
# expensive way to do the cheapest kind of animation. Ship.gd and
|
|
# Asteroid.gd already work this way - this is the same idea packaged so a
|
|
# building can be assembled out of independently movable parts.
|
|
#
|
|
# Geometry is defined in local space around the piece's own origin, so the
|
|
# owner can move, spin, scale and fade it without touching the shape.
|
|
|
|
var polygons: Array = []
|
|
# Open runs of points, as distinct from `polygons`, which close. An accretion
|
|
# disc is arcs, not rings, so it needs the open form to be a piece at all.
|
|
var paths: Array = []
|
|
var lines: Array = []
|
|
var glow_color: Color = Color.WHITE
|
|
var core_color: Color = NeonDraw.DEFAULT_CORE
|
|
var pulse: float = 1.0
|
|
|
|
|
|
static func create(parent: Node, at: Vector2, colour: Color, alpha: float = 1.0) -> NeonPiece:
|
|
var piece: NeonPiece = NeonPiece.new()
|
|
piece.position = at
|
|
piece.glow_color = colour
|
|
piece.modulate.a = alpha
|
|
parent.add_child(piece)
|
|
return piece
|
|
|
|
|
|
func add_polygon(points: PackedVector2Array, piece_pulse: float = 1.0,
|
|
width: float = 1.0) -> void:
|
|
polygons.append({"points": points, "pulse": piece_pulse, "width": width})
|
|
|
|
|
|
func add_path(points: PackedVector2Array, piece_pulse: float = 1.0,
|
|
width: float = 1.0) -> void:
|
|
paths.append({"points": points, "pulse": piece_pulse, "width": width})
|
|
|
|
|
|
func add_line(from: Vector2, to: Vector2, width: float, piece_pulse: float = 1.0) -> void:
|
|
lines.append({"from": from, "to": to, "width": width, "pulse": piece_pulse})
|
|
|
|
|
|
func _draw() -> void:
|
|
for poly in polygons:
|
|
NeonDraw.draw_glowing_polygon(self, poly.points, glow_color,
|
|
poly.pulse * pulse, core_color, float(poly.get("width", 1.0)))
|
|
for path in paths:
|
|
NeonDraw.draw_glowing_path(self, path.points, glow_color,
|
|
path.pulse * pulse, path.width, core_color)
|
|
for line in lines:
|
|
NeonDraw.draw_glowing_line(self, line.from, line.to, glow_color,
|
|
line.pulse * pulse, line.width, core_color)
|