modrinth-enhanced, modrinth-enhanced-bin: preload vblank shim for the full refresh rate on nvidia

modrinth-enhanced-bin/PKGBUILD

@@ -4,13 +4,13 @@
 
 pkgname=modrinth-enhanced-bin
 pkgver=0.21.2
-pkgrel=1
+pkgrel=2
 pkgdesc="Modrinth App without ads or telemetry, with offline and Ely.by accounts and Linux fixes (upstream binary)"
 arch=('x86_64')
 url="https://github.com/Felitendo/Modrinth-Enhanced"
 license=('GPL-3.0-only')
 depends=('cairo' 'dbus' 'gdk-pixbuf2' 'glib2' 'glibc' 'gtk3' 'hicolor-icon-theme'
-         'libgcc' 'libsoup3' 'webkit2gtk-4.1'
+         'libdrm' 'libgcc' 'libsoup3' 'webkit2gtk-4.1'
          # loaded by Minecraft, not by the launcher
          'libgl' 'libpulse' 'libx11' 'libxcursor' 'libxext' 'libxxf86vm')
 optdepends=('xorg-xrandr: for older Minecraft versions')
@@ -21,12 +21,30 @@ options=('!strip' '!debug')
 # v0.21.2-2, which pkgver spells 0.21.2.r2; see pkg.sh.
 _tag="v0.21.2"
 _asset="Modrinth.Enhanced_0.21.2_amd64.deb"
-source=("${pkgname}-${pkgver}.deb::https://github.com/Felitendo/Modrinth-Enhanced/releases/download/${_tag}/${_asset}")
+# With the NVIDIA driver WebKitGTK paces the app with a 60 fps timer whatever
+# the monitor's refresh rate. vblank-shim.c, preloaded by modrinth-enhanced.sh,
+# paces it at the monitor's rate instead and keeps the app on X11, the only
+# place that works; it is not part of upstream's release.
+source=("${pkgname}-${pkgver}.deb::https://github.com/Felitendo/Modrinth-Enhanced/releases/download/${_tag}/${_asset}"
+        "vblank-shim.c"
+        "modrinth-enhanced.sh")
 noextract=("${pkgname}-${pkgver}.deb")
-sha256sums=('32ed32575050b4ac1a990b54a894e82c17860a48d5a228ce0d1ce7fc2c9d5d6f')
+sha256sums=('32ed32575050b4ac1a990b54a894e82c17860a48d5a228ce0d1ce7fc2c9d5d6f' '0190921b8ff2fb1deec3209cba71c01541ca1f013e3ba41680f1636e185fd455' 'b24872f82645c52ee4804599cd678d138876fb193c754403fa9c5cf92bd745b9')
+
+build() {
+  # GLib for its headers only: the shim looks GTK and GLib up at run time
+  gcc $CPPFLAGS $CFLAGS $LDFLAGS -shared -fPIC -o libwebkit-vblank-shim.so vblank-shim.c \
+    $(pkg-config --cflags glib-2.0) $(pkg-config --cflags --libs libdrm)
+}
 
 package() {
   bsdtar -xOf "$srcdir/${pkgname}-${pkgver}.deb" 'data.tar.*' \
     | bsdtar -xpf - -C "$pkgdir" usr
+
+  # the binary moves behind the script that preloads the shim
+  install -d "$pkgdir/usr/lib/modrinth-enhanced"
+  mv "$pkgdir/usr/bin/ModrinthEnhanced" "$pkgdir/usr/lib/modrinth-enhanced/"
+  install -Dm755 libwebkit-vblank-shim.so -t "$pkgdir/usr/lib/modrinth-enhanced/"
+  install -Dm755 modrinth-enhanced.sh "$pkgdir/usr/bin/ModrinthEnhanced"
   ln -s ModrinthEnhanced "$pkgdir/usr/bin/modrinth-enhanced"
 }