07 GPU Field Engine

07 — The GPU Field Engine

Thin host, fat GPU

main.cpp → navigator_main() → RayCanvas → Pipeline::dispatch_canvas() → vkCmdDispatch

C++ opens the window and pushes buttons. The GPU runs the world.

rtx() singleton

One global Vulkan fabric: device, queues, hardwareFabric, VRAM budget.

Canvas kinds

Kind	Default shader	Push block	Primary use
X86Fields	x86.comp	FieldSocket	Field Die + AmmoOS (default)
Classic	CANVAS.comp + swipes	PushConstants	Thermo + RT demos

Default ./linux.sh run → Field Die, not decorative raymarch.

Descriptor layout (x86 path)

Binding	Resource
0	HDR output
1	FieldX86Die SSBO
2	ThermoAccountant
8–10	Phi, Thermo, Flow
11–14	AmouranthOS chrome textures

FIELD_LAYOUT_VERSION = 5 — host and shader must match.

Sealed time

TotalTime::seal() → monotonic session clock in FieldSocket::sealed_time. Frame-rate drift cannot rewrite physics time.

✅ Full Vulkan dispatch loop.
🎭 "96% lies device cannot drift session" — security posture narrative.

Next: 08 — Field Die & Data Bus