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spaceship/PlanetSurface.tscn
Loïc Wisniewski 657ca9d035 Make the lunar backdrop cheap: 3x3 field, then bake and tile it (#68) 
The crater shader ran on every pixel of a fullscreen rect every frame and
was by far the most expensive thing in the surface scene. Nothing else came
close: RockField keeps 14 rocks alive, Rock/Ship/Enemy already avoid
per-frame queue_redraw() for transform-only changes, and LunarBackground.gd
is a handful of scalar ops.

Three reductions to the field itself:

- 5x5 -> 3x3 neighbour scan. That width was never the geometric answer;
  it was insurance against craters seen clipping at cell boundaries
  on-device, i.e. a crater reaching past its nominal radius because a hash
  returned a value outside [0,1] and extrapolated mix(). Clamping the
  crater CENTRE into its own cell, alongside the radius clamp already
  there, bounds the reach whatever the hash returns - so a crater two cells
  out is >= 1.0 cells away, a normalized distance of >= 2.63, past every
  threshold the shading reacts to (the last saturates at 1.15). The outer
  ring provably cannot change a pixel. This removes the clipping bug's
  cause instead of hiding it behind 16 extra samples.
- One hash42 per cell instead of hash21 twice plus hash22, decorrelating
  on output lanes rather than input offsets.
- Squared distances in the loop, square-rooted twice at the end rather
  than once per sample.

Measured with the new tests/profile_shader.sh, above softpipe's own ~657ms
fullscreen floor: 9482ms -> 405ms of shader work, a 23x reduction.

Then the larger change: the field is a fixed function of world position, so
every frame recomputed an identical answer. It is now made periodic (the
cell index is wrapped before hashing, which makes a Worley field tile
exactly rather than merely blend), baked once at load into one tile, and
scrolled with repeat wrapping by lunar_tiled.gdshader - one texture fetch
per pixel. Two honest costs: the field repeats every 7040 world units, and
a fixed-resolution tile softens when zoomed past 1:1. Lunar regolith is
forgiving of both, having no landmarks and being smooth gradients already.

The bake waits a frame and asks the material whether it actually samples a
field_texture, so a gas giant - which swaps in its own background shader
(#51) - does not pay for a 2048-square tile it will never read. Headless
runs skip it entirely, having nothing to rasterize.

tests/test_lunar_field.gd guards the reasoning, since a fragment shader
cannot be asserted on directly: the premises are still in the source, the
worst-case ring-2 geometry stays clear of every threshold independent of
the hash, a 3x3 and a 5x5 scan render identically over 4000 sampled points,
the field repeats exactly in both axes, and the miss sentinel still cannot
overflow mediump into +Inf and then NaN.

test_surface_profiles.gd asserted "a rocky landing leaves the background
alone" by naming lunar_surface.gdshader; it now reads the shader from the
scene, which is the property it actually cares about.

PlanetSurface.tscn's edit also carries the planet-name relocation described
in the HUD commit - same scene file, so the two cannot be split.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-17 23:20:14 +02:00

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[gd_scene load_steps=16 format=3]
[ext_resource type="Script" path="res://GameController.gd" id="1"]
[ext_resource type="Script" path="res://LunarBackground.gd" id="2"]
[ext_resource type="Shader" path="res://lunar_tiled.gdshader" id="3"]
[ext_resource type="Script" path="res://Fleet.gd" id="4"]
[ext_resource type="Script" path="res://PlanetSurfaceController.gd" id="5"]
[ext_resource type="Script" path="res://IconButton.gd" id="6"]
[ext_resource type="Script" path="res://TouchJoystick.gd" id="7"]
[ext_resource type="Script" path="res://ResourceReadout.gd" id="9"]
[ext_resource type="Script" path="res://GasBombController.gd" id="14"]
[ext_resource type="Script" path="res://LaserController.gd" id="16"]
[ext_resource type="Script" path="res://SpeedFader.gd" id="17"]
[ext_resource type="Script" path="res://CaptureLabel.gd" id="15"]
[sub_resource type="ShaderMaterial" id="1"]
shader = ExtResource("3")
shader_parameter/camera_cell = Vector2(0, 0)
shader_parameter/camera_frac = Vector2(0, 0)
shader_parameter/camera_zoom = 1.0
shader_parameter/viewport_size = Vector2(720, 1280)
shader_parameter/cell_size = 220.0
shader_parameter/tile_cells = 32.0
[node name="PlanetSurface" type="Node2D"]
script = ExtResource("1")
[node name="BackgroundLayer" type="CanvasLayer" parent="."]
layer = -10
[node name="LunarBackground" type="ColorRect" parent="BackgroundLayer"]
material = SubResource("1")
mouse_filter = 2
anchors_preset = 15
anchor_right = 1.0
anchor_bottom = 1.0
grow_horizontal = 2
grow_vertical = 2
script = ExtResource("2")
[node name="Fleet" type="Node2D" parent="."]
script = ExtResource("4")
ship_glow_color = Color(0.06, 0.32, 0.5, 1)
ship_core_color = Color(0.02, 0.09, 0.15, 1)
[node name="GasBombController" type="Node2D" parent="."]
script = ExtResource("14")
[node name="LaserController" type="Node2D" parent="."]
script = ExtResource("16")
[node name="Camera2D" type="Camera2D" parent="."]
position = Vector2(0, 0)
zoom = Vector2(1, 1)
[node name="SurfaceFeatures" type="Node2D" parent="."]
[node name="SurfaceController" type="Node2D" parent="."]
script = ExtResource("5")
[node name="UI" type="CanvasLayer" parent="."]
layer = 1
[node name="ResourceReadout" type="Control" parent="UI"]
mouse_filter = 2
offset_left = 28
offset_top = 38
offset_right = 696
offset_bottom = 154
script = ExtResource("9")
digit_height = 38.0
bright_background = true
[node name="BankCaption" type="Label" parent="UI"]
mouse_filter = 2
offset_left = 28
offset_top = 6
offset_right = 220
offset_bottom = 34
theme_override_font_sizes/font_size = 18
theme_override_colors/font_color = Color(0.08, 0.16, 0.2, 1)
theme_override_colors/font_outline_color = Color(0.9, 0.95, 0.96, 0.8)
theme_override_constants/outline_size = 4
text = "BANKED"
[node name="FleetCaption" type="Label" parent="UI"]
mouse_filter = 2
offset_left = 356
offset_top = 6
offset_right = 620
offset_bottom = 34
theme_override_font_sizes/font_size = 18
theme_override_colors/font_color = Color(0.24, 0.14, 0.02, 1)
theme_override_colors/font_outline_color = Color(0.96, 0.93, 0.82, 0.85)
theme_override_constants/outline_size = 4
text = "FLEET HOLD"
[node name="PlanetNameLabel" type="Label" parent="UI"]
mouse_filter = 2
offset_left = 400
offset_top = 40
offset_right = 696
offset_bottom = 148
text = ""
horizontal_alignment = 2
vertical_alignment = 0
autowrap_mode = 2
theme_override_font_sizes/font_size = 30
theme_override_colors/font_color = Color(0.08, 0.08, 0.11, 1)
theme_override_colors/font_outline_color = Color(0.95, 0.95, 0.96, 0.85)
theme_override_constants/outline_size = 5
[node name="CaptureLabel" type="Label" parent="UI"]
mouse_filter = 2
offset_left = 24
offset_top = 286
offset_right = 696
offset_bottom = 326
theme_override_font_sizes/font_size = 28
theme_override_colors/font_color = Color(0.08, 0.16, 0.2, 1)
theme_override_colors/font_outline_color = Color(0.9, 0.95, 0.96, 0.8)
theme_override_constants/outline_size = 4
horizontal_alignment = 1
text = ""
script = ExtResource("15")
[node name="ExitButton" type="Control" parent="UI"]
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = 24
offset_right = 172
offset_top = -720
offset_bottom = -572
script = ExtResource("6")
icon = 4
glow_color = Color(0.06, 0.32, 0.5, 1)
core_color = Color(0.02, 0.09, 0.15, 1)
[node name="KeyboardHintLabel" type="Label" parent="UI"]
visible = false
mouse_filter = 2
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = 28
offset_right = 360
offset_top = -300
offset_bottom = -120
theme_override_font_sizes/font_size = 36
autowrap_mode = 2
text = "WASD / arrows move Q / E pivot wheel zoom"
[node name="Joystick" type="Control" parent="UI"]
mouse_filter = 2
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = 24
offset_right = 424
offset_top = -424
offset_bottom = -24
script = ExtResource("7")
glow_color = Color(0.06, 0.32, 0.5, 1)
core_color = Color(0.02, 0.09, 0.15, 1)
[node name="SpeedFader" type="Control" parent="UI"]
visible = false
mouse_filter = 2
anchor_left = 1.0
anchor_right = 1.0
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = -94
offset_right = -24
offset_top = -720
offset_bottom = -560
script = ExtResource("17")
glow_color = Color(0.5, 0.18, 0.6, 1)
core_color = Color(0.02, 0.09, 0.15, 1)
[node name="Label" type="Label" parent="UI/SpeedFader"]
mouse_filter = 2
offset_left = -20
offset_right = 90
offset_top = -32
offset_bottom = -4
theme_override_font_sizes/font_size = 20
theme_override_colors/font_color = Color(0.7, 0.3, 1, 1)
horizontal_alignment = 1
text = "x1.0"
[node name="LaserButton" type="Control" parent="UI"]
visible = false
mouse_filter = 2
anchor_left = 1.0
anchor_right = 1.0
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = -344
offset_right = -196
offset_top = -344
offset_bottom = -196
script = ExtResource("6")
icon = 36
glow_color = Color(0.3, 0.9, 1, 1)
core_color = Color(0.02, 0.09, 0.15, 1)
[node name="PivotCCWButton" type="Control" parent="UI"]
mouse_filter = 2
anchor_left = 1.0
anchor_right = 1.0
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = -344
offset_right = -196
offset_top = -172
offset_bottom = -24
script = ExtResource("6")
icon = 7
glow_color = Color(0.06, 0.32, 0.5, 1)
core_color = Color(0.02, 0.09, 0.15, 1)
[node name="GasBombButton" type="Control" parent="UI"]
visible = false
mouse_filter = 2
anchor_left = 1.0
anchor_right = 1.0
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = -172
offset_right = -24
offset_top = -344
offset_bottom = -196
script = ExtResource("6")
icon = 32
glow_color = Color(0.82, 0.08, 0.48, 1)
core_color = Color(0.02, 0.09, 0.15, 1)
[node name="GasBombStatus" type="Label" parent="UI"]
mouse_filter = 2
anchor_left = 1.0
anchor_right = 1.0
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = -344
offset_right = -24
offset_top = -480
offset_bottom = -430
theme_override_font_sizes/font_size = 18
theme_override_colors/font_color = Color(0.82, 0.08, 0.48, 1)
autowrap_mode = 2
horizontal_alignment = 1
text = ""
[node name="LaserStatus" type="Label" parent="UI"]
mouse_filter = 2
anchor_left = 1.0
anchor_right = 1.0
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = -344
offset_right = -24
offset_top = -540
offset_bottom = -490
theme_override_font_sizes/font_size = 18
theme_override_colors/font_color = Color(0.2, 0.6, 0.68, 1)
autowrap_mode = 2
horizontal_alignment = 1
text = ""
[node name="PivotCWButton" type="Control" parent="UI"]
mouse_filter = 2
anchor_left = 1.0
anchor_right = 1.0
anchor_top = 1.0
anchor_bottom = 1.0
offset_left = -172
offset_right = -24
offset_top = -172
offset_bottom = -24
script = ExtResource("6")
icon = 6
glow_color = Color(0.06, 0.32, 0.5, 1)
core_color = Color(0.02, 0.09, 0.15, 1)
[node name="FadeOverlay" type="CanvasLayer" parent="."]
layer = 10
[node name="FadeRect" type="ColorRect" parent="FadeOverlay"]
mouse_filter = 2
anchors_preset = 15
anchor_right = 1.0
anchor_bottom = 1.0
grow_horizontal = 2
grow_vertical = 2
color = Color(0, 0, 0, 1)
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