vo_gpu: remove --scale-wblur etc

No need for this since it's entirely redundant with just changing the
filter radius directly. In fact, that's the whole *point* of the filter
radius - it does not modify the filter, it modifies the scaling of the
window.

Of course, this does not work for non-resizable kernels. But, really,
who cares?

DOCS/interface-changes.rst

@@ -59,6 +59,7 @@ Interface changes
     - change `--subs-fallback-forced` so that it works alongside `--slang`
     - add `--icc-3dlut-size=auto` and make it the default
     - add `--scale=ewa_lanczos4sharpest`
+    - remove `--scale-wblur`, `--cscale-wblur`, `--dscale-wblur`, `--tscale-wblur`
  --- mpv 0.36.0 ---
     - add `--target-contrast`
     - Target luminance value is now also applied when ICC profile is used.

DOCS/man/options.rst

@@ -5351,12 +5351,12 @@ them.
         never interpolate, thus behaving as if the regular nearest neighbour
         algorithm was used. Defaults to 0.0.
 
-``--scale-blur=<value>``, ``--scale-wblur=<value>``, ``--cscale-blur=<value>``, ``--cscale-wblur=<value>``, ``--dscale-blur=<value>``, ``--dscale-wblur=<value>``, ``--tscale-blur=<value>``, ``--tscale-wblur=<value>``
-    Kernel/window scaling factor (also known as a blur factor). Decreasing this
-    makes the result sharper, increasing it makes it blurrier (default 0). If
-    set to 0, the kernel's preferred blur factor is used. Note that setting
-    this too low (eg. 0.5) leads to bad results. It's generally recommended to
-    stick to values between 0.8 and 1.2.
+``--scale-blur=<value>``, ``--cscale-blur=<value>``, ``--dscale-blur=<value>``, ``--tscale-blur=<value>``
+    Kernel scaling factor (also known as a blur factor). Decreasing this makes
+    the result sharper, increasing it makes it blurrier (default 0). If set to
+    0, the kernel's preferred blur factor is used. Note that setting this too
+    low (eg. 0.5) leads to bad results. It's generally recommended to stick to
+    values between 0.8 and 1.2.
 
 ``--scale-clamp=<0.0-1.0>``, ``--cscale-clamp``, ``--dscale-clamp``, ``--tscale-clamp``
     Specifies a weight bias to multiply into negative coefficients. Specifying

video/out/gpu/video.c

@@ -356,7 +356,7 @@ static int validate_error_diffusion_opt(struct mp_log *log, const m_option_t *op
     {n"-cutoff", OPT_FLOAT(scaler[i].cutoff), M_RANGE(0.0, 1.0)},          \
     {n"-taper",  OPT_FLOAT(scaler[i].kernel.taper), M_RANGE(0.0, 1.0)},    \
     {n"-wparam", OPT_FLOATDEF(scaler[i].window.params[0])},                \
-    {n"-wblur",  OPT_FLOAT(scaler[i].window.blur)},                        \
+    {n"-wblur",  OPT_REMOVED("Just adjust filter radius directly")},       \
     {n"-wtaper", OPT_FLOAT(scaler[i].window.taper), M_RANGE(0.0, 1.0)},    \
     {n"-clamp",  OPT_FLOAT(scaler[i].clamp), M_RANGE(0.0, 1.0)},           \
     {n"-radius", OPT_FLOAT(scaler[i].radius), M_RANGE(0.5, 16.0)},         \