Re-Organize Vulkan build order a bit

scripts.d/50-vulkan/60-libplacebo.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+PLACEBO_REPO="https://code.videolan.org/videolan/libplacebo.git"
+PLACEBO_COMMIT="e91a59f055a2d4025b587fa9e9cf91a6ba934377"
+
+ffbuild_enabled() {
+    [[ $ADDINS_STR == *4.4* ]] && return -1
+    return 0
+}
+
+ffbuild_dockerbuild() {
+    git-mini-clone "$PLACEBO_REPO" "$PLACEBO_COMMIT" placebo
+    cd placebo
+
+    mkdir build && cd build
+
+    local myconf=(
+        --prefix="$FFBUILD_PREFIX"
+        --buildtype=release
+        --default-library=static
+        -Dvulkan=enabled
+        -Dvulkan-link=false
+        -Dvulkan-registry="$FFBUILD_PREFIX"/share/vulkan/registry/vk.xml
+        -Dglslang=enabled
+        -Ddemos=false
+        -Dtests=false
+        -Dbench=false
+        -Dfuzz=false
+    )
+
+    if [[ $TARGET == win* ]]; then
+        myconf+=(
+            -Dd3d11=enabled
+        )
+    fi
+
+    if [[ $TARGET == win* || $TARGET == linux* ]]; then
+        myconf+=(
+            --cross-file=/cross.meson
+        )
+    else
+        echo "Unknown target"
+        return -1
+    fi
+
+    meson "${myconf[@]}" ..
+    ninja -j$(nproc)
+    ninja install
+
+    echo "Libs.private: -lstdc++" >> "$FFBUILD_PREFIX"/lib/pkgconfig/libplacebo.pc
+}
+
+ffbuild_configure() {
+    echo --enable-libplacebo
+}
+
+ffbuild_unconfigure() {
+    [[ $ADDINS_STR == *4.4* ]] && return 0
+    echo --disable-libplacebo
+}