the very rough sync gap mode

README.md

@@ -43,7 +43,7 @@ Usage: realcugan-ncnn-vulkan -i infile -o outfile [options]...
   -n noise-level       denoise level (-1/0/1/2/3, default=-1)
   -s scale             upscale ratio (1/2/3/4, default=2)
   -t tile-size         tile size (>=32/0=auto, default=0) can be 0,0,0 for multi-gpu
-  -c syncgap-mode      sync gap mode (0/1/2, default=2)
+  -c syncgap-mode      sync gap mode (0/1/2/3, default=3)
   -m model-path        realcugan model path (default=models-se)
   -g gpu-id            gpu device to use (-1=cpu, default=auto) 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
@@ -55,7 +55,7 @@ Usage: realcugan-ncnn-vulkan -i infile -o outfile [options]...
 - `noise-level` = noise level, large value means strong denoise effect, -1 = no effect
 - `scale` = scale level, 1 = no scaling, 2 = upscale 2x
 - `tile-size` = tile size, use smaller value to reduce GPU memory usage, default selects automatically
-- `syncgap-mode` = sync gap mode, 0 = no sync, 1 = accurate sync, 2 = rough sync
+- `syncgap-mode` = sync gap mode, 0 = no sync, 1 = accurate sync, 2 = rough sync, 3 = very rough sync
 - `load:proc:save` = thread count for the three stages (image decoding + realcugan upscaling + image encoding), using larger values may increase GPU usage and consume more GPU memory. You can tune this configuration with "4:4:4" for many small-size images, and "2:2:2" for large-size images. The default setting usually works fine for most situations. If you find that your GPU is hungry, try increasing thread count to achieve faster processing.
 - `format` = the format of the image to be output, png is better supported, however webp generally yields smaller file sizes, both are losslessly encoded
 

src/main.cpp

@@ -108,7 +108,7 @@ static void print_usage()
     fprintf(stdout, "  -n noise-level       denoise level (-1/0/1/2/3, default=-1)\n");
     fprintf(stdout, "  -s scale             upscale ratio (1/2/3/4, default=2)\n");
     fprintf(stdout, "  -t tile-size         tile size (>=32/0=auto, default=0) can be 0,0,0 for multi-gpu\n");
-    fprintf(stdout, "  -c syncgap-mode      sync gap mode (0/1/2, default=2)\n");
+    fprintf(stdout, "  -c syncgap-mode      sync gap mode (0/1/2/3, default=3)\n");
     fprintf(stdout, "  -m model-path        realcugan model path (default=models-se)\n");
     fprintf(stdout, "  -g gpu-id            gpu device to use (-1=cpu, default=auto) can be 0,1,2 for multi-gpu\n");
     fprintf(stdout, "  -j load:proc:save    thread count for load/proc/save (default=1:2:2) can be 1:2,2,2:2 for multi-gpu\n");
@@ -448,7 +448,7 @@ int main(int argc, char** argv)
     std::vector<int> jobs_proc;
     int jobs_save = 2;
     int verbose = 0;
-    int syncgap = 2;
+    int syncgap = 3;
     int tta_mode = 0;
     path_t format = PATHSTR("png");
 
@@ -577,7 +577,7 @@ int main(int argc, char** argv)
         return -1;
     }
 
-    if (!(syncgap == 0 || syncgap == 1 || syncgap == 2))
+    if (!(syncgap == 0 || syncgap == 1 || syncgap == 2 || syncgap == 3))
     {
         fprintf(stderr, "invalid syncgap argument\n");
         return -1;