2bd4e101a0
Cycles uses pixel buffers to update the display. Due to making things work the vulkan backend downloaded the GPU allocated pixel buffer to the CPU, Copied it to a GPU allocated staging buffer and update the display texture using the staging buffer. Needless to say that a (CPU->)GPU->CPU->GPU roundtrip is a bottleneck. This PR fixes this by allowing the pixel buffer to act as a staging buffer as well. Viewport and final image rendering performance is now also similar. | **Render** | **GPU Backend** | **Path tracing** | **Display** | | ---------- | --------------- | ---------------- | ----------- | | Viewport | OpenGL | 2.7 | 0.06 | | Viewport | Vulkan | 2.7 | 0.04 | | Image | OpenGL | 3.9 | 0.02 | | Image | Vulkan | 3.9 | 0.02 | Tested on: ``` Operating system: Linux-6.8.0-49-generic-x86_64-with-glibc2.39 64 Bits, X11 UI Graphics card: AMD Radeon Pro W7700 (RADV NAVI32) Advanced Micro Devices radv Mesa 24.3.1 - kisak-mesa PPA Vulkan Backend ``` Pull Request: https://projects.blender.org/blender/blender/pulls/133485
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