- C++ 70.7%
- C 29.2%
mkryss
bdd0010bd3
- Made `current_backend` a reference to a `BackendEntry` instead of an index into the backends array. - Changed `BackendEntry::get` to return a pointer, so it avoids making a copy (and avoids a dangling reference later on in the code). |
||
|---|---|---|
| lib/imgui | ||
| src | ||
| test | ||
| .gitignore | ||
| CMakeLists.txt | ||
| README.md | ||
| zorya.supp | ||
Zorya - C++26 Newtonian gravity engine with hotswappable backends
Zorya is a (soon to be) high performance modular N body newtonian gravity engine built in C++26. It (will) feature
runtime switchable compute backends. The rendering is handled using OpenGL 4.5 with an ImGui overlay. It serves as a study piece in HPC, heterogeneous computing and GPGPU computing. As such, a conscious decision to implement the naive O(N²) method was made. Keeping a computationally heavy yet highly parallel algorithm as the baseline allows Zorya to properly showcase the throughput difference between a purely scalar implementation, SIMD on CPU and GPGPU. Of course, this also means that optimisations are left on the table in the spirit of fair benchmarking. Finally, Zorya also supports runtime precision swappning to showcase the advantages and disadvantages of float and double for throughput and numerical stability.
Build and run
Dependencies
- CMake 3.31+
- C++26
- glfw
- glew
Build instructions
Start by cloning the repo
git clone https://dawn.wine/jojers/Zorya.git
Set up cmake and compile
cd Zorya
cmake -B build && cmake --build build -j $(nproc)
Run the application with ./build/zorya [args]. If compiled with tests, run them with ./build/zorya_tests
Runtime arguments
Zorya supports several arguments to control the way the engine generates the system. It makes the distinction between a major body and a minor body. They can be interpreted as either planets and asteroids or solar systems and lone stars. It depends on what scale you want to imagine.
| Toggle | Type | Default | Effects |
|---|---|---|---|
| -c, --count | Number | 10 | Number of major bodies |
| -r, --ratio | Number | 5 | Number of minor bodies per major body |
| -O, --orbit | Range | 50:500 | Width of the acceptable spawning area |
| -Mm, --major-mass | Range | 0.1:50 | Range of masses that a major body can be |
| -mm, --minor-mass | Range | 0.01:0.1 | Range of masses that a minor body can be |
A range must be formatted as from:to. Each side of the range is optional and omitting it will infer the default value. Please note that only positive values are accepted for both numbers and ranges.
For reference, the central star object has a mass of 1000.
Compile options
Zorya also has a some options passed at the CMake initialisation step like so cmake -B build [args]
| Option | Type | Default | Effects |
|---|---|---|---|
| ZORYA_TESTS | ON,OFF | ON | Toggle the build of the test executable |
| ZORYA_ENABLE_SIMD | ON,OFF | ON | Toggle SIMD capabilities (avx2, avx-512) |