Nothing is always absolutely so: Vulkan Software render

Google have created software based Vulkan implementation sometime ago as not a official project.

And i have decided to check how it was in compare to other soft rendering implementations. And here are some results with yquake:

ref_gl1: 632 frames, 24.4 seconds: 25.9 fps (mesa 19.3.2 llvmpipe LLVM 9.0.1, 128 bits)
ref_gl3: 632 frames, 28.9 seconds: 21.9 fps (mesa 19.3.2 llvmpipe LLVM 9.0.1, 128 bits)
ref_soft: 632 frames, 10.9 seconds: 57.8 fps (mesa 19.3.2)
ref_vk: 632 frames, 98.9 seconds: 6.4 fps (SwiftShader Device LLVM 7.0.1)

Used steps for build SwiftShader are:

git clone git@github.com:google/swiftshader.git
cd swiftshader/build
CC="ccache gcc-8" CXX="ccache g++-8" cmake ..
CC="ccache gcc-8" CXX="ccache g++-8" make -j 2 vk_swiftshader
sudo cp libvk_swiftshader.so /usr/lib/aarch64-linux-gnu/libvulkan_swiftshader.so
sed -i "s|./libvk_swiftshader.so|/usr/lib/aarch64-linux-gnu/libvulkan_swiftshader.so|g" Linux/vk_swiftshader_icd.json
sudo cp Linux/vk_swiftshader_icd.json /usr/share/vulkan/icd.d/swiftshader_icd.aarch64.json
sudo chmod 644 /usr/share/vulkan/icd.d/swiftshader_icd.aarch64.json
sudo chown root:root /usr/share/vulkan/icd.d/swiftshader_icd.aarch64.json
sudo chmod 644 /usr/lib/aarch64-linux-gnu/libvulkan_swiftshader.so
sudo chown root:root /usr/lib/aarch64-linux-gnu/libvulkan_swiftshader.so

Note: Gcc 8 is preferred compiler for now as gcc-9 produced error with current version of code base.

Used steps for build yQuake2 are:

Nothing is always absolutely so