Modern Graphics APIs
API comparisons, dynamic rendering, work graphs, and ray tracing references.
Modern Graphics APIs
长文 walkthrough 见 Vulkan Review。
Comparison
Resources
Vulkan Dynamic Rendering
使用 Dynamic Rendering 特性化繁为简，去除针对 Tiling GPU 的 RenderPass / Framebuffer 依赖。
Resources
- https://lesleylai.info/en/vk-khr-dynamic-rendering/
- https://www.khronos.org/blog/streamlining-render-passes
- https://www.reddit.com/r/vulkan/comments/sd93nm/the_future_of_renderpass_mechanism_vs_dynamic/
- https://gpuopen.com/learn/vulkan-renderpasses/
DX12 Work Graphs
Work Graphs is a new feature in Direct3D 12 API that allows the GPU to generate work for itself on the fly. This aids GPU-driven rendering, allowing for more autonomy for the GPU without relying on going back and forth between the CPU and GPU.
Supported GPUs: Only RTX 30-series and 40-series on the NVIDIA side, and RDNA 3 cards on the AMD side support this feature. Latest drivers are required.
这是一个很有意义的开始，也是多年来图形开发人员的夙愿。突破了自通用计算以来不能动态调度的限制， 可以自由的以 work item 调度 work item\grid，形成 Graph 结构，即在 GPU thread 中 launch 新的 thread， 并且执行新的 shader 逻辑。实际上这个能力在 GPU 中已经存在：HW Ray Tracing，但只能在 HWRT 上特定使用，且配置复杂。 目前开放出来作为通用机制，这对于所有基于 GPU Driven 的机制将会有很大改变， 可以以更加优雅的方式实现，更充分利用计算资源，甚至会更有创意的玩法出现。 - 丛越
这有点像在metal kernel shader中encode cmd buffer，再动态派发 - 往昔
Resources
- https://devblogs.microsoft.com/directx/d3d12-work-graphs/
- Work Graphs API: First Look At Performance Of DirectX 12's Latest Feature
- AMDGPUOpen - Microsoft DirectX ® 12中的GPU Work Graph
- https://www.zhihu.com/question/608461646/answer/3199883646
- https://interplayoflight.wordpress.com/2024/06/29/a-quick-introduction-to-workgraphs/
Raytracing
Resources
- https://raytracing.github.io/
- https://www.realtimerendering.com/raytracinggems/
- https://alain.xyz/blog/real-time-ray-tracing
- https://blog.demofox.org/2020/05/25/casual-shadertoy-path-tracing-1-basic-camera-diffuse-emissive/
- https://github.com/NVIDIAGameWorks/GettingStartedWithRTXRayTracing
- https://github.com/nvpro-samples/vk_raytracing_tutorial_KHR
- https://github.com/GPSnoopy/RayTracingInVulkan