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https://github.com/jpbruyere/vkvg

Vulkan 2D graphics library
https://github.com/jpbruyere/vkvg

2d cairo drawing-library gpu graphics graphics-library vector vulkan

Last synced: about 2 months ago
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Vulkan 2D graphics library

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README 

        


  


  

	vkvg

  

  


	


  Vulkan Vector Graphics

  




  

     

  

  

    

  

  

    

  

  

  

    

  

  

    

  





  

    

  

  

    

  



	



**vkvg** is an open-source *2D graphics library* written in **C** using [Vulkan](https://www.khronos.org/vulkan/) as backend.

The **API** follows the same pattern as [Cairo](https://www.cairographics.org/), but new functions and original drawing mechanics may be added.



**vkvg** is in alpha development stage and the core api is mostly stabilized. All contributions are welcome.



In progress API documentation is available online at http://vkvg.org.





  

	

  

  

	

  

  

	

  




## Performance comparison





  

	

  

   
major libs perf comparison




## Current status:



- Fill (stencil even-odd, non-zero).

- Stroke.

- Basic painting operation.

- Font system with caching operational.

- Linear/Radial Gradients.

- Line caps and joins.

- Dashes.

- Context should be thread safe, extensive tests required.

- Image loading and writing with [stb lib](https://github.com/nothings/stb)

- Test includes svg rendering either with built-in renderer or [nanoSVG](https://github.com/memononen/nanosvg)



## Requirements:



- [CMake](https://cmake.org/): version >= 3.16

- [Vulkan](https://www.khronos.org/vulkan/): version >= 1.1

- [FontConfig](https://www.freedesktop.org/wiki/Software/fontconfig/): optional, without fontconfig, use `vkvg_load_font_from_path`.

- [Freetype](https://www.freetype.org/): optional, stb_truetype as alternative.

- [Harfbuzz](https://www.freedesktop.org/wiki/Software/HarfBuzz/): optional, without complex text shaping may be wrong.

- GLSLC: spirv compiler, included in [LunarG SDK](https://www.lunarg.com/vulkan-sdk/): compile shader to spir-V (building only, optional)

- [xxd](https://linux.die.net/man/1/xxd): generate headers with precompiled shaders (building only, optional)

- [GLFW](http://www.glfw.org/): optional, if present tests are built.



if `glslc` or `xxd` are not present, a precompiled version of the shaders is stored in the git tree.



## Building








```bash

#fetch sources from github

git clone --recursive https://github.com/jpbruyere/vkvg.git

cd vkvg

# Create build directory

mkdir build

cd build

# Run CMake configuration

cmake ..

```



### CMake configure options



##### Core library options:



* `-DVKVG_USE_GLUTESS=true`: Use embedded glu tesselator to fill polygones in NON-ZERO mode. If false, a simple ear clipping algorithm is used.

* `-DVKVG_SVG=true`: Enable experimental svg renderer. If false, use nanoSVG.

* `-DVKVG_RECORDING=true`: Enable experimental draw commands recording infrastructure.

* `-DVKVG_BUILD_DOCS=true`: Build documentation if doxygen is found.



##### Vulkan Features:



* `-DVKVG_ENABLE_VK_SCALAR_BLOCK_LAYOUT=true`: Enable `VK_EXT_scalar_block_layout` that reduce structure padding for gpu.

* `-VKVG_ENABLE_VK_TIMELINE_SEMAPHORE=true`: Enable experimental work syncing with `VK_KHR_timeline_semaphore` instead of Fences.



##### Text rendering libraries:



Those libraries are enabled by default, but disabled if not found.

* `-DVKVG_USE_FONTCONFIG=true`: enable FontConfig to resolve font's names.

* `-DVKVG_USE_FREETYPE=true`: enable FreeType to render glyphs, if false glyphs are rendered with stb_truetype.

* `-DVKVG_USE_HARFBUZZ=true`: enable harfbuzz for text shaping.



##### Tests options:



* `-DVKVG_BUILD_TESTS=true`: build all tests in the tests forlder.

* `-DVKVG_TEST_DIRECT_DRAW=true`: enable drawing directly on the swapchain images.



##### Debugging options:



If vkvg is compiled with `CMAKE_BUILD_TYPE=Debug`, several additional options are made available to help debugging:

* `-DENABLE_VALIDATION=true`: enable vulkan validation layer.

* `-DENABLE_DBG_UTILS=true`: enable various vulkan debug utils extensions features.

* `-DENABLE_RENDERDOC=true`: enable renderdoc layer.

* `-DENABLE_WIRED_FILL=true`: enable rendering in wired mode, current mode is controled with the global variable `vkvg_wired_debug`.

* `-DENABLE_PROFILING=true`: add -pg to the compile options.

* `-DVKVG_DBG_STATS=true`: store various context statistics fetchable with `vkvg_device_get_stats()`



```bash

cmake --build .

```

A [detailed tutorial](doc/windows_build_tutorial.md) is available for Windows.



## Running tests



Append the `-h` option to see available command line parameters.



## Contributing



See the [contribution guide](https://github.com/jpbruyere/vkvg/blob/master/CONTRIBUTING.md) for more information.



Join us on [gitter](https://gitter.im/CSharpRapidOpenWidgets) for any question.



## Addtitional Credits



- vkvg use the [AGG project](http://antigrain.com/)'s recursive bezier algorithm which is kindly exposed [here](http://agg.sourceforge.net/antigrain.com/research/adaptive_bezier/index.html).

- I've learned Vulkan with the help of the excellent [Sacha Willems's vulkan examples](https://github.com/SaschaWillems/Vulkan).

- The 2d affine matrix implementation follows Cairo's one.



## Change log



* v0.2.0

	- radial gradients.

	- better stroke joins handling.

	- png saved in srgb format.

	- doxygen cmake target and style



## To Do



- [x] Use Scissor where possible.

- [x] Improve stroke algorithms.

- [x] Radial gradients.

- [x] Dashed lines.

- [ ] Operators.

- [x] Optimize vulkan memory allocations by sub-allocating from a single shared memory chunk per type.

- [x] Optimize command submissions.

- [x] Test SDF font rendering.

- [x] Avoid line joins inside curves and arc.

- [ ] Structured unit testing.

- [x] Perf and memory checks.

- [ ] Code cleanup and comments.

- [ ] Documentations.