chore: Implement display initialization

.gitignore

@@ -1,29 +1,192 @@
-# ---> Go
+# ---> Python
-# If you prefer the allow list template instead of the deny list, see community template:
+# Byte-compiled / optimized / DLL files
-# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
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+*.py[cod]
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+*$py.class
-*.exe
+
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-# Test binary, built with `go test -c`
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+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
 
-# Output of the go coverage tool, specifically when used with LiteIDE
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 # ---> C
 # Prerequisites
@@ -113,3 +276,5 @@ dkms.conf
 *.out
 *.app
 
+# ---> UnrealXR
+data

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "evdi"]
+	path = evdi
+	url = https://github.com/DisplayLink/evdi

README.md

@@ -1,2 +1,12 @@
-# openglass
+# UnrealXR
 
+UnrealXR is a display multiplexer for the original Nreal Air (other devices may be supported).
+
+## Development
+
+1. Clone this repository with submodules: `git clone --recurse-submodules https://git.terah.dev/imterah/unrealxr.git`
+2. Initialize the development shell: `nix-shell`
+3. Create a virtual environment: `python3 -m venv .venv; source .venv/bin/activate`
+4. Install Python dependencies: `pip install -r requirements.txt`
+4. Build libevdi: `cd evdi/library; make -j$(nproc); cd ../..`
+5. Build pyevdi: `cd evdi/pyevdi; make -j$(nproc); make install; cd ../..`

evdi

@@ -0,0 +1 @@
+Subproject commit 600ed4342a7251d4575ee4810756649f9e77cdf0

libunreal/__init__.py

@@ -0,0 +1,8 @@
+from libunreal.supported_devices import *
+from libunreal.edid import *
+from sys import platform
+
+if platform == "linux" or platform == "linux2":
+    from libunreal.linux import *
+else:
+    raise OSError("Unsupported operating system")

libunreal/edid.py

@@ -0,0 +1,8 @@
+import dataclasses
+
+@dataclasses.dataclass
+class EvdiDisplaySpec:
+    edid: bytes
+    max_width: int
+    max_height: int
+    max_refresh_rate: int

libunreal/linux/__init__.py

@@ -0,0 +1,74 @@
+import subprocess
+import os
+
+from libunreal.supported_devices import supported_devices
+from libunreal.edid import EvdiDisplaySpec
+import pyedid
+
+def fetch_xr_glass_edid(allow_unsupported_devices) -> EvdiDisplaySpec:
+    # Scan for all VGA devices and their IDs
+    pci_device_comand = subprocess.run(["lspci"], capture_output=True)
+
+    if pci_device_comand.returncode != 0:
+        raise OSError("Failed to scan PCI devices")
+
+    pci_devices: list[str] = pci_device_comand.stdout.decode("utf-8").split("\n")
+    pci_devices = pci_devices[:-1]
+
+    vga_devices: list[str] = []
+
+    for pci_device in pci_devices:
+        if "VGA compatible controller:" in pci_device:
+            vga_devices.append(pci_device[:pci_device.index(" ")])
+
+    # Attempt to find any XR glasses
+    for vga_device in vga_devices:
+        card_devices = list(os.listdir(f"/sys/devices/pci0000:00/0000:{vga_device}/drm/"))
+
+        for card_device in card_devices:
+            if "card" not in card_device:
+                continue
+
+            monitors = list(os.listdir(f"/sys/devices/pci0000:00/0000:{vga_device}/drm/{card_device}/"))
+
+            for monitor in monitors:
+                if card_device not in monitor:
+                    continue
+
+                with open(f"/sys/devices/pci0000:00/0000:{vga_device}/drm/{card_device}/{monitor}/edid", "rb") as edid:
+                    raw_edid_file = edid.read()
+
+                    if len(raw_edid_file) == 0:
+                        continue
+
+                    edid = pyedid.parse_edid(raw_edid_file)
+
+                    for manufacturer, manufacturer_supported_devices in supported_devices.items():
+                        if edid.manufacturer_pnp_id == manufacturer and (edid.name in manufacturer_supported_devices or allow_unsupported_devices):
+                            max_width = 0
+                            max_height = 0
+                            max_refresh = 0
+
+                            for resolution in edid.resolutions:
+                                if resolution[0] > max_width and resolution[1] > max_height:
+                                    max_width = resolution[0]
+                                    max_height = resolution[1]
+
+                                max_refresh = max(max_refresh, int(resolution[2]))
+
+                            if max_width == 0 or max_height == 0:
+                                if "max_width" not in manufacturer_supported_devices[edid.name] or "max_height" not in manufacturer_supported_devices[edid.name]:
+                                   raise ValueError("Couldn't determine maximum width and height, and the maximum width and height isn't defined in the device quirks section")
+
+                                max_width = int(manufacturer_supported_devices[edid.name]["max_width"])
+                                max_height = int(manufacturer_supported_devices[edid.name]["max_height"])
+
+                            if max_refresh == 0:
+                                if "max_refresh" not in manufacturer_supported_devices[edid.name]:
+                                   raise ValueError("Couldn't determine maximum refresh rate, and the maximum refresh rate isn't defined in the device quirks section")
+
+                                max_refresh = int(manufacturer_supported_devices[edid.name]["max_refresh"])
+
+                            return EvdiDisplaySpec(raw_edid_file, max_width, max_height, max_refresh)
+
+    raise ValueError("Could not find supported device. Check if the device is plugged in. If it is plugged in and working correctly, check the README or open an issue.")

libunreal/supported_devices.py

@@ -0,0 +1,11 @@
+# Sourced from "https://uefi.org/uefi-pnp-export"
+supported_devices: dict[str, dict[str, dict[str, str | int]]] = {
+    "MRG": {
+        # Quirks section
+        "Air": {
+            "max_width": 1920,
+            "max_height": 1080,
+            "max_refresh": 120
+        }
+    }
+}

main.py

@@ -0,0 +1,159 @@
+#!/usr/bin/env python3
+import atexit
+import json
+import os
+
+from platformdirs import user_data_dir, user_config_dir
+from loguru import logger
+import PyEvdi
+import pyedid
+import time
+
+import libunreal
+from libunreal.edid import EvdiDisplaySpec
+
+default_configuration: dict[str, str | int] = {
+    "display_angle": 45,
+    "display_count": 3,
+    "allow_unsupported_devices": False,
+    "allow_unsupported_vendors": False,
+    "override_default_edid": False,
+    "edid_override_path": "/file/here",
+    "override_width": 0,
+    "override_height": 0,
+    "override_refresh_rate": 0,
+}
+
+def initialize_configuration():
+    pass
+
+used_cards: list[int] = []
+
+def find_suitable_evdi_card() -> int:
+    for i in range(20):
+        if PyEvdi.check_device(i) == PyEvdi.AVAILABLE and i not in used_cards:
+            used_cards.append(i)
+            return i
+
+    PyEvdi.add_device()
+
+    for i in range(20):
+        if PyEvdi.check_device(i) == PyEvdi.AVAILABLE and i not in used_cards:
+            used_cards.append(i)
+            return i
+
+    raise ValueError("Failed to allocate available device")
+
+@logger.catch
+def main():
+    configuration = {}
+
+    logger.info("Loading configuration")
+    config_dir = os.environ["UNREALXR_CONFIG_PATH"] if "UNREALXR_CONFIG_PATH" in os.environ else ""
+    data_dir = os.environ["UNREALXR_DATA_PATH"] if "UNREALXR_DATA_PATH" in os.environ else ""
+
+    # Use OS defaults if we weren't overriden in env
+    if config_dir == "":
+        config_dir = user_config_dir("UnrealXR", "Tera")
+
+    if data_dir == "":
+        data_dir = user_data_dir("UnrealXR", "Tera")
+
+    try:
+        os.stat(data_dir)
+    except OSError:
+        os.makedirs(data_dir)
+
+    # Read config and create it if it doesn't exist
+    config_path = os.path.join(config_dir, "config.json")
+
+    try:
+        os.stat(config_path)
+
+        with open(config_path, "r") as config_file:
+            configuration = json.load(config_file)
+    except OSError:
+        try:
+            os.makedirs(config_dir)
+        except OSError:
+            pass
+
+        with open(config_path, "w") as config_file:
+            json.dump(default_configuration, config_file, indent=4)
+
+        configuration = default_configuration
+
+    # Set unbound values (ie. if user is using an older version)
+    for key, default_value in default_configuration.items():
+        if key not in configuration:
+            # Add quotes if we're a string
+            value = default_value
+
+            if isinstance(value, str):
+                value = f'"{value}"'
+
+            logger.warning(f"Setting unbound key '{key}' with default value {value}. You might want to define this! If not, this warning can be safely ignored.")
+            configuration[key] = default_value
+
+    # Initialize logging to files
+    logger.add(os.path.join(data_dir, "unrealxr.log"), format="{time:YYYY-MM-DD at HH:mm:ss} | {level} | {message}")
+    logger.info("Loaded configuration")
+
+    if os.geteuid() != 0:
+        raise OSError("You are not running as root! Running as root is necessary to talk to the EVDI service")
+
+    # Get the display EDID
+    logger.info("Attempting to read display EDID file")
+    edid: EvdiDisplaySpec | None = None
+
+    if configuration["override_default_edid"] or configuration["allow_unsupported_vendors"]:
+        # We need to parse it to get the maximum width, height, and refresh rate for EVDI's calculations
+        with open(configuration["edid_override_path"], "rb") as edid_file:
+            edid_file = edid_file.read()
+            parsed_edid_file = pyedid.parse_edid(edid_file)
+
+            max_width = int(configuration["override_width"])
+            max_height = int(configuration["override_height"])
+            max_refresh = int(configuration["override_refresh_rate"])
+
+            if configuration["override_width"] == 0 or configuration["override_height"] == 0 or configuration["override_refresh_rate"] == 0:
+                for resolution in parsed_edid_file.resolutions:
+                    if configuration["override_width"] == 0 or configuration["override_height"] == 0:
+                        if resolution[0] > max_width and resolution[1] > max_height:
+                            max_width = resolution[0]
+                            max_height = resolution[1]
+
+                    if configuration["override_refresh_rate"] == 0:
+                        max_refresh = max(max_refresh, int(resolution[2]))
+
+            if max_width == 0 or max_height == 0:
+                raise ValueError("Could not determine maximum width and height from EDID file, and the ")
+
+            if max_refresh == 0:
+                raise ValueError("Could not determine maximum refresh rate from EDID file, and the refresh rate overrides aren't set!")
+    else:
+        edid = libunreal.fetch_xr_glass_edid(configuration["allow_unsupported_devices"])
+
+    assert(edid is not None)
+
+    logger.info("Got EDID file")
+    logger.info("Initializing virtual displays")
+
+    cards = []
+
+    for i in range(int(configuration["display_count"])):
+        suitable_card_id = find_suitable_evdi_card()
+        card = PyEvdi.Card(suitable_card_id)
+        card.connect(edid.edid, len(edid.edid), edid.max_width*edid.max_height, edid.max_width*edid.max_height*edid.max_refresh_rate)
+        cards.append(card)
+
+        logger.debug(f"Initialized card #{str(i)}")
+
+        atexit.register(lambda: card.close())
+
+    logger.info("Initialized displays")
+
+    time.sleep(10)
+if __name__ == "__main__":
+    print("Welcome to UnrealXR!\n")
+    main()

requirements.txt

@@ -0,0 +1,5 @@
+setuptools==80.9.0
+pybind11==2.13.6
+pyedid==1.0.3
+loguru==0.7.3
+platformdirs==4.3.8

shell.nix

@@ -0,0 +1,35 @@
+{
+  pkgs ? import <nixpkgs> { },
+}: pkgs.mkShell {
+  buildInputs = with pkgs; [
+    # Runtime dependencies
+    python3
+    pciutils
+
+    # evdi build dependencies
+    libdrm
+    linuxHeaders
+
+    # raylib build dependencies
+    libGL
+    xorg.libXi
+    xorg.libXcursor
+    xorg.libXrandr
+    xorg.libXinerama
+    waylandpp
+    libxkbcommon
+  ];
+
+  shellHook = ''
+    export LD_LIBRARY_PATH="$PWD/evdi/library:$LD_LIBRARY_PATH"
+    mkdir -p "$PWD/data/config" "$PWD/data/data"
+    export UNREALXR_CONFIG_PATH="$PWD/data/config"
+    export UNREALXR_DATA_PATH="$PWD/data/data"
+
+    if [ ! -d ".venv" ]; then
+      python3 -m venv .venv
+    fi
+
+    source .venv/bin/activate
+  '';
+}

unrealxr

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+sudo LD_LIBRARY_PATH=$LD_LIBRARY_PATH UNREALXR_CONFIG_PATH=$UNREALXR_CONFIG_PATH UNREALXR_DATA_PATH=$UNREALXR_DATA_PATH python3 main.py