lavfi: add an overlay_vulkan filter

This commit adds a basic, non-converting overlay filter for Vulkan.

configure

@@ -3531,6 +3531,7 @@ openclsrc_filter_deps="opencl"
 overlay_opencl_filter_deps="opencl"
 overlay_qsv_filter_deps="libmfx"
 overlay_qsv_filter_select="qsvvpp"
+overlay_vulkan_filter_deps="vulkan libglslang"
 owdenoise_filter_deps="gpl"
 pan_filter_deps="swresample"
 perspective_filter_deps="gpl"

libavfilter/Makefile

@@ -323,6 +323,7 @@ OBJS-$(CONFIG_OVERLAY_FILTER)                += vf_overlay.o framesync.o
 OBJS-$(CONFIG_OVERLAY_OPENCL_FILTER)         += vf_overlay_opencl.o opencl.o \
                                                 opencl/overlay.o framesync.o
 OBJS-$(CONFIG_OVERLAY_QSV_FILTER)            += vf_overlay_qsv.o framesync.o
+OBJS-$(CONFIG_OVERLAY_VULKAN_FILTER)         += vf_overlay_vulkan.o vulkan.o
 OBJS-$(CONFIG_OWDENOISE_FILTER)              += vf_owdenoise.o
 OBJS-$(CONFIG_PAD_FILTER)                    += vf_pad.o
 OBJS-$(CONFIG_PALETTEGEN_FILTER)             += vf_palettegen.o

libavfilter/allfilters.c

@@ -307,6 +307,7 @@ extern AVFilter ff_vf_oscilloscope;
 extern AVFilter ff_vf_overlay;
 extern AVFilter ff_vf_overlay_opencl;
 extern AVFilter ff_vf_overlay_qsv;
+extern AVFilter ff_vf_overlay_vulkan;
 extern AVFilter ff_vf_owdenoise;
 extern AVFilter ff_vf_pad;
 extern AVFilter ff_vf_palettegen;