Files

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CydandClaude Opus 4.8 dce89a8571 Phase 3b: live OpenGL render backend in DOSBox-X (VPX_RENDER=1)

The emulated VPX board now draws frames in real time. The FIFO burst
assembler feeds an in-process DPL scene store; each vr_draw_scene publishes a
frame snapshot to a dedicated WGL window thread that renders it fixed-function.

- vpxlog.cpp: scene_burst() decode + VScene store + rt_main GL window thread;
  glFrustum from the view-node window rect, glScalef(-1,1,1) for Division's
  mirrored screen-x, action-31 camera as modelview. No build change (opengl32
  already linked).
- Validated: flyk divrgb.scn opens the "VPX VelociRender (emulated)" window
  and draws the SMPTE bars live via the real camera.spl spline camera
  (divrgb-live-gl.png), matching the offline render_capture.py decode.
- Game path (alpha1.conf) opens the window + draws background but hits the
  pre-existing production btdpl.ini vr_sync timeout (sends_wo_rcv) -- not a 3b
  issue. Remaining work tracked in PHASE3-PROGRESS.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-03 14:27:58 -05:00

README.md

Phase 1 complete: captured VPX boot conversation from shipped binary

2026-07-02 22:46:20 -05:00

vpxlog.cpp

Phase 3b: live OpenGL render backend in DOSBox-X (VPX_RENDER=1)

2026-07-03 14:27:58 -05:00

README.md

VPX device — DOSBox-X integration

Our original source for the emulated Division VPX link adapter. Kept here under version control because the DOSBox-X source tree itself (emulator/src/, ~490 MB) is git-ignored.

vpxlog.cpp — Phase 1 logging device. Impersonates the INMOS C012 link adapter at I/O base 0x150, answers status reads so the game keeps transmitting, and logs every access to $VPXLOG. (Phase 2 will grow this into a responding transputer-monitor + i860-loader + frame-stream renderer, or fork into a separate vpx.cpp.)

Applying to a DOSBox-X source checkout

Tested against DOSBox-X v2026.06.02, MSYS2 mingw64.

Copy the device in:

cp emulator/vpx-device/vpxlog.cpp  emulator/src/src/hardware/vpxlog.cpp

Add it to the hardware build — in src/src/hardware/Makefile.am, append vpxlog.cpp to libhardware_a_SOURCES (we inserted it after glide.cpp).
Call the init — in src/src/gui/sdlmain.cpp, declare void VPXLOG_Init(); next to the other *_Init() prototypes and call VPXLOG_Init(); right after GLIDE_Init(); in the machine bring-up sequence.

Build:

cd emulator/src
./build-mingw-sdl2 --enable-debug=heavy

Output: src/src/dosbox-x.exe.

Running

set VPXLOG=C:\VWE\TeslaRel410\emulator\vpxlog.txt
emulator\src\src\dosbox-x.exe -conf emulator\capture.conf
python emulator\analyze_capture.py

With VPXLOG unset the device is inert and the build behaves like stock DOSBox-X.