update readme usage, add ubuntu-20.04 ci

Author: nihui

.github/workflows/CI.yml

@@ -139,6 +139,40 @@ jobs:
         name: waifu2x-ncnn-vulkan-artifact-ubuntu-18.04
         path: waifu2x-ncnn-vulkan-artifact
 
+  ubuntu-2004:
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
+    - name: cache-vulkansdk
+      id: cache-vulkansdk
+      uses: actions/cache@v1
+      with:
+        path: "1.2.135.0"
+        key: vulkansdk-linux-x86_64-1.2.135.0
+    - name: vulkansdk
+      if: steps.cache-vulkansdk.outputs.cache-hit != 'true'
+      run: |
+        wget https://sdk.lunarg.com/sdk/download/1.2.135.0/linux/vulkansdk-linux-x86_64-1.2.135.0.tar.gz?Human=true -O vulkansdk-linux-x86_64-1.2.135.0.tar.gz
+        tar -xf vulkansdk-linux-x86_64-1.2.135.0.tar.gz
+        rm -rf 1.2.135.0/source 1.2.135.0/samples
+        find 1.2.135.0 -type f | grep -v -E 'vulkan|glslang' | xargs rm
+    - name: configure
+      run: export VULKAN_SDK=`pwd`/1.2.135.0/x86_64 && mkdir build && cd build && cmake ../src
+    - name: build
+      run: cmake --build build -j 2
+    - name: deploy
+      run: |
+        mkdir waifu2x-ncnn-vulkan-artifact
+        strip build/waifu2x-ncnn-vulkan
+        cp -v build/waifu2x-ncnn-vulkan waifu2x-ncnn-vulkan-artifact
+        cp -v -r models/* waifu2x-ncnn-vulkan-artifact
+    - uses: actions/upload-artifact@v2
+      with:
+        name: waifu2x-ncnn-vulkan-artifact-ubuntu-20.04
+        path: waifu2x-ncnn-vulkan-artifact
+
   macos-1015:
     runs-on: macos-10.15
     steps:

README.md

@@ -30,15 +30,15 @@ Usage: waifu2x-ncnn-vulkan -i infile -o outfile [options]...
   -h                   show this help
   -v                   verbose output
   -i input-path        input image path (jpg/png/webp) or directory
-  -o output-path       output image path (png/webp) or directory
+  -o output-path       output image path (jpg/png/webp) or directory
   -n noise-level       denoise level (-1/0/1/2/3, default=0)
   -s scale             upscale ratio (1/2, default=2)
-  -t tile-size         tile size (>=32/0=auto, default=0)
+  -t tile-size         tile size (>=32/0=auto, default=0) can be 0,0,0 for multi-gpu
   -m model-path        waifu2x model path (default=models-cunet)
-  -g gpu-id            gpu device to use (default=0)
-  -j load:proc:save    thread count for load/proc/save (default=1:2:2)
+  -g gpu-id            gpu device to use (default=0) can be 0,1,2 for multi-gpu
+  -j load:proc:save    thread count for load/proc/save (default=1:2:2) can be 1:2,2,2:2 for multi-gpu
   -x                   enable tta mode
-  -f format            output image format (png/webp, default=ext/png)
+  -f format            output image format (jpg/png/webp, default=ext/png)
 ```
 
 - `input-path` and `output-path` accept either file path or directory path