ori_sky
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The following patches are included: ## J2D: Rewrite text rendering This patch rewrites text rendering for `J2D::DrawString` to now construct a texture atlas for all ASCII-range glyphs in the FT font face, instead of constructing a texture for every glyph. This improves text rendering performance for several reasons: 1. Binding textures is relatively expensive as the GPU is required to do a context switch for internal data like texture parameters, and also cannot optimize for accesses to the same texture across draw calls. This patch removes the need to call `glBindTexture` more than once per call to `J2D::DrawString`. 2. As a consequence of the above, all glyphs for a given string can now be rendered in a single call to `glDrawArrays`. This is done by storing the cached texture coordinates on `CachedGlyph` and constructing a full array of vertices and texture coordinates for the entire string at once, resulting in only /one/ set of client-to-device attribute uploads and only one draw call, instead of being required to upload attribute data for each glyph separately. ## FontCache: Use map for efficient glyph lookup This patch updates `CachedFont` to now use an `std::map` for cached glyphs, instead of an `std::vector`. `std::map` allows O(log n) lookup, whereas `std::vector` only allows O(n) lookup. Note: `std::unordered_map` technically has better lookup complexity here, with amortized O(1) lookup. However, hashmaps have a higher inherent overhead than red-black trees so this would only be viable when going above around 1000 entries, which should never happen here for ASCII glyphs. Co-authored-by: Ori Sky Farrell <ori.sky.farrell+git@gmail.com> Reviewed-on: #23 Co-authored-by: ori_sky <redacted@ori.mx> Co-committed-by: ori_sky <redacted@ori.mx>
Josh Graphics Library
Yet Another C++ Rendering Toolkit
Goals
- Provide single-function-calls to render various graphics primitives in 2D and 3D.
- Integrated directly with our other toolkits (ReWindow, J3ML)
- Quick Rendering of Debug Text, Geometric Widgets, Textures, and so forth.
Non-Goals
- Full Rendering Engine
- OpenGL/Vulkan Wrapper
- Asset Loading & Management
Features
- Modern C++ (20)
- Little-to-no overhead
- No hand-holding
- No-frills, straight up just renders shapes and text.
- Integrates right into an existing OpenGL rendering system.
Usage
Install instructions and code samples coming soon ™️ !
Documentation
Documentation is (sic: will be) automatically generated from latest commit and is hosted at https://doc.redacted.cc/jgl .
Contributing
Contributions to JGL are welcome! If you find a bug, have a feature request, or would like to contribute code, please submit an issue or pull request to our repository!
License
JGL is licensed under the Public Domain. See the LICENSE file for details.
Acknowledgements
JGL is developed and maintained by Josh O'Leary @ Co from Redacted Software and contributors. Special thanks to Redacted.