Gas burner building and the energy resource (#54)
A new building that consumes gas to produce energy, a new resource
stored and moved exactly like ore and gas.
The resource: EnergyResourceGlyph (a cell/bolt mark) + energy's own
warm yellow-green ResourceDefinition, registered in
ResourceDefinitions.ORDER/DEFINITIONS and GameState.RESOURCE_ENERGY.
Inventory/ResourceBar/ResourceTransferList needed no changes - #49
already made them resource-agnostic, confirmed structurally in the
test rather than touched.
The building: GasBurnerBuildingVisual (a hexagonal chamber with intake
vents in gas's colour and output ports in energy's, so the silhouette
itself reads "gas in, energy out"), GasBurnerBuildingDefinition
(capabilities=["gas_burner"], its own build-menu icon appended to
IconButton.Icon rather than inserted, per the ticket's own warning
about renumbering stored scene values), and the matching
UI/BuildMenu/GasBurner* nodes in Main.tscn. Gated behind a new
"Power Systems" skill-tree node, mirroring how "freight" unlocks the
transport hub.
Conversion: _advance_gas_burners(), simulated in GameState alongside
_advance_production/extractor mining so it keeps running while the
player is elsewhere. Withdraws gas and deposits energy in the
building's OWN inventory only - never the bank - so it stalls with no
local gas exactly like a lab waiting on materials.
Logistics: a gas burner's ongoing gas deficit is folded into the
existing queued-building-supply dispatch path (same "needs resource X"
loop production/research orders already use, extended with
gas_burner_gas_deficit()), and a new TO_BUILDING_PICKUP/
TO_MOTHERSHIP_FROM_BUILDING transporter state pair collects its energy
to the bank, mirroring the extractor pickup path per the ticket. The
existing f5c60f8 priority (queued deliveries outrank collection) holds:
the pickup dispatch loop runs last.
Tests: new tests/test_gas_burner.gd (resource genericity, stall
semantics, research gate, and full delivery+pickup logistics via a
real hub), run_tests transporter/resource regressions, and screenshots
of the build menu (all 7 buildings) and transfer menu (all 3
resources). Full suite: 81/81.
Two real bugs found and fixed along the way, neither gas-burner-
specific:
- _transporter_inbound_to() matched ANY non-idle transporter with a
matching target_id, regardless of purpose. Once pickup states shared
target_id with delivery states (both address a building, not an
extractor), a transporter delivering gas made the SAME building look
"busy" to the unrelated energy-pickup dispatch, starving it even
with a second, genuinely free transporter sitting idle at the hub.
Split into _transporter_inbound_to() (delivery states only) and a
new _transporter_inbound_for_pickup() (pickup states only).
- The build menu's 3-row/6-slot layout (MENU_ROW_TOPS + row content
sizing) had no room for a 7th building - despite the ticket's own
note that no layout changes should be needed. A naive 4th row ran
off the bottom of a 720x1280 viewport; fitting one meant both adding
a 4th row top AND shrinking the shared button/label/cost sizing so
each row's content no longer taller than the compressed row spacing.
Caught only by actually screenshotting it - a real build menu, not
headless, since --headless renders nothing.
🤖 Generated with Claude Code
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-08-16 12:10:31 +02:00
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[gd_resource type="Resource" script_class="BuildingDefinition" load_steps=3 format=3]
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[ext_resource type="Script" path="res://BuildingDefinition.gd" id="1"]
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[ext_resource type="PackedScene" path="res://GasBurnerBuildingVisual.tscn" id="2"]
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[resource]
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script = ExtResource("1")
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definition_id = "gas_burner"
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display_name = "Gas Burner"
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description = "Burns gas into energy at its own site. Hub transporters keep it stocked with gas and collect the energy it makes."
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cost = 30
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action_icon = 33
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menu_icon = 33
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visual_scene = ExtResource("2")
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capabilities = PackedStringArray("gas_burner")
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map_color = Color(0.95, 0.35, 0.15, 1)
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map_sides = 5
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map_radius = 7.0
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map_phase = 0.0
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menu_button_name = "GasBurnerButton"
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menu_label_name = "GasBurnerLabel"
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menu_cost_name = "GasBurnerCost"
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