Tune and optimize boss encounter

surface/BossSurfaceProfile.tres

@@ -1,8 +1,9 @@
-[gd_resource type="Resource" script_class="PlanetSurfaceProfile" load_steps=4 format=3]
+[gd_resource type="Resource" script_class="PlanetSurfaceProfile" load_steps=5 format=3]
 
 [ext_resource type="Script" path="res://surface/PlanetSurfaceProfile.gd" id="1"]
-[ext_resource type="Shader" path="res://shaders/boss_surface.gdshader" id="2"]
+[ext_resource type="Shader" path="res://shaders/lunar_tiled.gdshader" id="2"]
 [ext_resource type="PackedScene" path="res://boss/BossEncounter.tscn" id="3"]
+[ext_resource type="Texture2D" path="res://surface/boss_membrane.svg" id="4"]
 
 [resource]
 script = ExtResource("1")
@@ -11,6 +12,7 @@ encounter_scene = ExtResource("3")
 editor_visible = false
 show_capture_status = false
 background_shader = ExtResource("2")
+background_field_texture = ExtResource("4")
 base_color = Color(0.055, 0.008, 0.05, 1)
 crater_color = Color(0.16, 0.018, 0.10, 1)
 highlight_color = Color(0.16, 0.66, 0.72, 1)

surface/PlanetSurfaceProfile.gd

@@ -17,6 +17,10 @@ extends Resource
 # the game and the setup editor drift apart, since each scene "already had" a
 # different shader. SurfaceBackground.apply_profile() is the only consumer.
 @export var background_shader: Shader = null
+# Optional ready-made field for a tiled background shader. Procedural rocky
+# terrain still bakes once; authored surfaces can avoid both that load spike
+# and all per-frame procedural fragment work by shipping their tile directly.
+@export var background_field_texture: Texture2D = null
 @export var base_color: Color = Color(0.75, 0.75, 0.76, 1.0)
 @export var crater_color: Color = Color(0.44, 0.44, 0.45, 1.0)
 @export var highlight_color: Color = Color(0.89, 0.89, 0.9, 1.0)

surface/SurfaceBackground.gd

@@ -50,6 +50,7 @@ var camera: Camera2D = null
 # differing only in colour, so keying on the shader alone would show void's
 # palette with rocky's crater texture.
 var _baked_key: Array = []
+var _provided_field_texture: Texture2D = null
 
 
 # Applies a surface profile to this backdrop: which shader draws it, and the
@@ -68,9 +69,14 @@ func apply_profile(profile: Resource) -> void:
 	highlight_color = profile.highlight_color
 	if profile.background_shader != null:
 		material.shader = profile.background_shader
+	_provided_field_texture = profile.background_field_texture
 	material.set_shader_parameter("base_color", base_color)
 	material.set_shader_parameter("crater_color", crater_color)
 	material.set_shader_parameter("highlight_color", highlight_color)
+	if _provided_field_texture != null and _material_wants_baked_field():
+		material.set_shader_parameter("field_texture", _provided_field_texture)
+		_baked_key = [material.shader, _provided_field_texture]
+		return
 	_bake_field()
 
 

surface/boss_membrane.svg

@@ -0,0 +1,22 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 512 512">
+  <rect width="512" height="512" fill="#21061c"/>
+  <g fill="#451139" opacity="0.5">
+    <ellipse cx="112" cy="116" rx="104" ry="78"/>
+    <ellipse cx="374" cy="350" rx="126" ry="96"/>
+    <ellipse cx="246" cy="246" rx="72" ry="118" opacity="0.42"/>
+  </g>
+  <g fill="none" stroke-linecap="round">
+    <path d="M0 68 C120 18 164 128 268 76 S420 20 512 68" stroke="#2b6972" stroke-width="7" opacity="0.42"/>
+    <path d="M0 260 C102 214 176 324 282 270 S420 214 512 260" stroke="#245d68" stroke-width="6" opacity="0.35"/>
+    <path d="M0 452 C118 402 170 506 276 460 S418 404 512 452" stroke="#2b6972" stroke-width="6" opacity="0.38"/>
+    <path d="M94 0 C46 116 152 178 102 286 S46 420 94 512" stroke="#326f76" stroke-width="6" opacity="0.34"/>
+    <path d="M354 0 C300 102 410 180 356 276 S304 416 354 512" stroke="#285f69" stroke-width="7" opacity="0.4"/>
+  </g>
+  <g fill="#55a9ae" opacity="0.3">
+    <circle cx="268" cy="76" r="8"/>
+    <circle cx="282" cy="270" r="7"/>
+    <circle cx="276" cy="460" r="8"/>
+    <circle cx="102" cy="286" r="7"/>
+    <circle cx="356" cy="276" r="9"/>
+  </g>
+</svg>

surface/boss_membrane.svg.import

@@ -0,0 +1,43 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bajkflkc0r3cp"
+path="res://.godot/imported/boss_membrane.svg-6482a210571f1472430bfb4ecba98f3c.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://surface/boss_membrane.svg"
+dest_files=["res://.godot/imported/boss_membrane.svg-6482a210571f1472430bfb4ecba98f3c.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false