swung0x48
3d9a38a979
P7 exit gate 1 asks for integration green "under Magma push and split". Until now it was not
merely unmet, it was UNMEASURABLE: every arm of mgl_itest_register_split_arms hardcoded
MOBILEGL_BACKEND_TYPE=DirectGLES (:2002/:2025/:2031) and MGL_ITEST_MAGMA_WIRE_ENVIRONMENT
hardcoded MOBILEGL_TRANSPORT=inproc (:2456), so the shared integration-split / -spawn / -tcp
labels held ZERO DirectVulkan entries and the 73 integration-magma-split cases only ever ran in
one process.
The registration macro now takes the backend as its first argument; the old name is a thin
wrapper, so all 32 call sites are untouched and every DirectGLES name, label and private log
path is byte-for-byte what it was. Two tiers come out of it, and the CMake comment states both:
* GATED - integration-magma-{split,spawn,tcp}. The six hand-laid Magma lanes (Fm, Buffers,
RunAhead, Caches, NamedBlit, P5fRsp) grow arms through one shared shape macro; the inproc
arm keeps its names, its labels and its log paths, so the CI steps and the two magma_*
checker scripts that name them by hand keep working unchanged.
* INFORMATIONAL - integration-magma-all-{split,spawn,tcp}, in no gating step. Every scenario
the split arms run, on Magma, on all three transports, generated by REPLAYING the macro's
recorded call list - so a scenario added to the split arms tomorrow joins the Magma census
the same day. Its job is to be able to go red while CI stays green; a case moves up into the
gated tier with the commit that retires its blocker.
The label spellings are chosen against ctest -L's regex (ID-131 again): the tier word goes in
the MIDDLE, because integration-magma-spawn-all WOULD have been selected by
-L integration-magma-spawn and pulled ~100 expected-red entries into a gated lane. Sub-labels
mirror it: the inproc arm keeps integration-magma-buffers, the others put the arm word first.
MagmaRunAheadScenario and MagmaWireCacheScenario stay on the inproc arm alone, and that is
MEASURED rather than assumed: with all three arms registered, all 21 entries red on spawn and
tcp with no Fatal in either role log - the first arms its hold through
ServerLoopInstance().SetBeforeRetireHookForTesting, a hook on THIS process's server loop, and
the second asserts transportName == "inproc" in its SetUp. Both are named in the CMakeLists and
in spawn_lane_parity.py rather than allowed to widen a tolerance.
split_log_paths.py's is_split prefixes gain DirectVulkan.Spawn. / .Tcp. - on those arms two
processes append to one path, so a shared log does not merely blur attribution, it interleaves
two sessions. spawn_lane_parity.py gains the Magma dimension, normalising only the ARM segment:
RunAhead.Credit1. and .Credit3. are two entries of one case and a tail-stripping normaliser
would fold them together and then report an equal-sized set that had lost one.
Measured on this tree (lavapipe): magma-split 73 unchanged and green, magma-spawn 52/52,
magma-tcp 52/52, the three informational lanes 102 each, GLES split 186 / spawn 102 / tcp 104
all unchanged and green. G14 against ~/w7/p7-before: 4155 to 4565, removed 0, added 410.
MobileGL
A desktop OpenGL implementation
MobileGL is a free and open-source project that implements a desktop OpenGL API. The goal is to provide a complete desktop OpenGL implementation with a state management layer and multi-backend support.
Note
Status: In development. Parts of the codebase are incomplete. Current short-term target: OpenGL 4.2 (Core Profile).
Project positioning
MobileGL is an implementation of a desktop OpenGL library. It aims to provide:
- Full OpenGL state management.
- A front-end that exposes OpenGL functions.
- Multiple independent backend implementations, where each backend targets a specific graphics API and remains fully isolated from others.
This project is intended as an implementation/translation layer.
Key components
The repository is organized into following top-level modules:
- MG_State — state tracking and management logic for Graphics APIs.
- MG_Impl — front-end implementations of Graphics APIs that interact with
MG_StateandMG_Backend. - MG_Backend — per-backend translation layer that maps front-end Graphics APIs' semantics and state into concrete backend API calls (e.g. OpenGL ES, Vulkan).
- MG_Util and other utility modules.
Third-party components
MobileGL reuses several open-source projects:
- SPIRV-Cross by KhronosGroup - Apache License 2.0: github
- glslang by KhronosGroup - Various Licenses: github
- DiligentCore by Diligent Graphics - Apache License 2.0: github
- flat_hash_map by Malte Skarupke - Boost Software License 1.0: github
Refer to each component's repository for exact license texts. Any bundled third-party code in this repository is included under the upstream project's license.
Compatibility & target
- Short-term target:
OpenGL 4.2 (Core Profile). - Current development focus:
- Performance improvement
MG_StateandMG_ImplforOpenGL 4.2 (Core Profile)Direct (Vulkan)backendDirect (OpenGL ES)backend
Build Instructions
We currently provide no releases and no precompiled binaries.
If you want to try the project right now, you’ll need to build it yourself:
-
Clone the repository:
git clone https://github.com/MobileGL-Dev/MobileGL.git -
Initialize and update all submodules recursively:
git submodule update --init --recursive -
Follow glslang’s own documentation for its required initiation.
-
Configure and build the project with CMake:
cmake -B build cmake --build buildor do it in a modern way:
cmake -S . -B build -G Ninja -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ cmake --build buildAlternatively, you can use platform-specific build commands as needed.
Build For macOS
On macOS, MobileGL can be built as a dylib that exposes the normal OpenGL/CGL/NSOpenGL entry points and routes them to the DirectVulkan backend. This is useful for running applications such as Minecraft through their stock GLFW/LWJGL OpenGL path while MobileGL is injected before context creation.
Prerequisites:
- macOS with Clang and Ninja.
- Vulkan loader and MoltenVK installed. With Homebrew, the MoltenVK ICD is commonly located at
/opt/homebrew/etc/vulkan/icd.d/MoltenVK_icd.json.
Configure and build:
cmake -S . -B build-macos-magma \
-G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DMOBILEGL_BACKEND_TYPE=DirectVulkan \
-DMOBILEGL_BUILD_TEST=OFF \
-DMOBILEGL_BUILD_BENCHMARK=OFF
cmake --build build-macos-magma --target MobileGL -j8
The dylib will be generated at:
build-macos-magma/libMobileGL.dylib
To run Minecraft by MobileGL from a launcher like PrismLauncher, keep the stock LWJGL/GLFW natives and add a wrapper command to the instance settings:
env DYLD_INSERT_LIBRARIES=/absolute/path/to/MobileGL/build-macos-magma/libMobileGL.dylib MOBILEGL_BACKEND_TYPE=DirectVulkan VK_ICD_FILENAMES=/opt/homebrew/etc/vulkan/icd.d/MoltenVK_icd.json
Also make sure the JVM arguments include:
-XstartOnFirstThread
DYLD_INSERT_LIBRARIES must be active before GLFW creates its OpenGL context. After startup, the Minecraft F3 screen should report MobileGL and the Direct (Vulkan) backend if the injection worked.
Build Options
| Option | Description | Default |
|---|---|---|
MOBILEGL_BUILD_TEST |
Build MobileGL tests (requires Clang) | ON |
MOBILEGL_BUILD_BENCHMARK |
Build MobileGL benchmarks (requires Clang) | ON |
MOBILEGL_FORCE_RELEASE_OPT |
Enable O3 and LTO in Debug build | ON |
MOBILEGL_ENABLE_TRACY |
Enable Tracy profiler for performance analysis | OFF |
Notes:
- The project requires C++23.
MG_TestandMG_Benchmarkcan only be built with Clang, not GCC. To enforce Clang, add-DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++to your command.- On Android, tests and benchmarks are always disabled.
Environment Variables
MobileGL supports runtime configuration via environment variables.
Supported Keys
| Variable | Description | Allowed Values | Default |
|---|---|---|---|
MOBILEGL_BACKEND_TYPE |
Select active backend implementation at startup. | DirectGLES, DirectVulkan |
DirectGLES |
MOBILEGL_DISABLE_TIMERQUERY |
Disable GPU timer-query exposure and use. | 0, 1 |
0 |
MOBILEGL_ESPRYT_USE_ANGLE |
Load ANGLE EGL/GLES libraries. | 0, 1 |
0 |
MOBILEGL_MAGMA_DISABLE_SUBGROUP |
Disable Vulkan shader subgroup support. | 0, 1 |
0 |
MOBILEGL_ADVERTISE_FP64 |
Advertise GL_ARB_gpu_shader_fp64. GLSL double/dvec/dmat compile and run either way - they are narrowed to 32 bits - so this only changes whether an application is told it has 64-bit precision, which it does not. |
0, 1 |
0 |
MOBILEGL_MAGMA_R11G11B10F_FALLBACK |
Use Magma's R11G11B10F format fallback. | 0, 1 |
0 |
MOBILEGL_MAGMA_FRAMESINFLIGHT |
Set Magma frames in flight. | Integer 1–64 |
3 |
MOBILEGL_ESPRYT_AVOID_SAMPLER_MIPMAP_MIN_FILTER |
Avoid sampler mipmap minification filters. | 0, 1 |
0 |
MOBILEGL_COHERENT_AS_FLUSH |
Treat persistent GL_MAP_FLUSH_EXPLICIT_BIT maps as coherent (app-compat for engines like Flywheel that never flush them). |
0, 1 |
0 |
MOBILEGL_ESPRYT_FORCE_DS_READBACK_EMULATION |
Always emulate depth/stencil glReadPixels/glGetTexImage by shader sampling on Espryt, instead of using the driver's own depth/stencil readback where it has one. |
0, 1 |
0 |
VK_ICD_FILENAMES |
Select the Vulkan ICD used by the Vulkan loader. | Path to an ICD JSON file | Loader default |
License
This project is distributed under GNU LGPL v3.0. See the LICENSE file in the repository for detailed information.