libplacebo: enable Vulkan, shaderc and glslang

srcpkgs/libplacebo/patches/fix-compilation.patch

@@ -0,0 +1,15 @@
+Source: maxice8
+Upstream: no, revert of https://github.com/haasn/libplacebo/commit/bcb73f3ae243f515d5c60b5d72db5e386987ef8e
+Reason: fixes compilation with our shaderc
+
+--- src/spirv_shaderc.c
++++ src/spirv_shaderc.c
+@@ -68,7 +68,7 @@ static bool shaderc_init(struct spirv_compiler *spirv)
+         goto error;
+ 
+     shaderc_compile_options_set_optimization_level(p->opts,
+-            shaderc_optimization_level_performance);
++			shaderc_optimization_level_size);
+ 
+     int ver, rev;
+     shaderc_get_spv_version(&ver, &rev);

srcpkgs/libplacebo/template

@@ -1,8 +1,11 @@
 # Template file for 'libplacebo'
 pkgname=libplacebo
 version=0.5.0
-revision=1
+revision=2
 build_style=meson
+configure_args="-Dvulkan=true -Dglslang=true -Dshaderc=true"
+hostmakedepends="pkg-config"
+makedepends="vulkan-loader glslang shaderc Vulkan-Headers"
 short_desc="Reusable library for GPU-accelerated video/image rendering"
 maintainer="maxice8 <thinkabit.ukim@gmail.com>"
 license="LGPL-2.1-or-later"