fix: use find_program for shader compiler, fix packaging deps

- Replace find_package(Vulkan COMPONENTS glslc) with find_program() so
  shader compiler detection works without system Vulkan headers
- Move glslc BuildRequires to Fedora-only, add shaderc for OpenSUSE
- Add shaderc dependency to Homebrew formula

Author: neatnoise

cmake/compile_definitions/linux.cmake

@@ -134,11 +134,11 @@ if(${SUNSHINE_ENABLE_VULKAN})
     endif()
 
     # prefer glslc, fall back to glslangValidator
-    find_package(Vulkan QUIET COMPONENTS glslc)
-    if(NOT TARGET Vulkan::glslc)
-        find_package(Vulkan QUIET COMPONENTS glslangValidator)
+    find_program(GLSLC_EXECUTABLE glslc)
+    if(NOT GLSLC_EXECUTABLE)
+        find_program(GLSLANG_EXECUTABLE glslangValidator)
     endif()
-    if(NOT TARGET Vulkan::glslc AND NOT TARGET Vulkan::glslangValidator)
+    if(NOT GLSLC_EXECUTABLE AND NOT GLSLANG_EXECUTABLE)
         message(FATAL_ERROR "Vulkan shader compiler not found (need glslc or glslangValidator)")
     endif()
 
@@ -157,17 +157,17 @@ if(${SUNSHINE_ENABLE_VULKAN})
 
     file(MAKE_DIRECTORY "${VULKAN_SHADER_DIR}")
 
-    if(TARGET Vulkan::glslc)
+    if(GLSLC_EXECUTABLE)
         add_custom_command(
                 OUTPUT "${VULKAN_SHADER_SPV}"
-                COMMAND Vulkan::glslc -O "${VULKAN_SHADER_SOURCE}" -o "${VULKAN_SHADER_SPV}"
+                COMMAND ${GLSLC_EXECUTABLE} -O "${VULKAN_SHADER_SOURCE}" -o "${VULKAN_SHADER_SPV}"
                 DEPENDS "${VULKAN_SHADER_SOURCE}"
                 COMMENT "Compiling Vulkan shader rgb2yuv.comp (glslc)"
                 VERBATIM)
     else()
         add_custom_command(
                 OUTPUT "${VULKAN_SHADER_SPV}"
-                COMMAND Vulkan::glslangValidator -V -o "${VULKAN_SHADER_SPV}" "${VULKAN_SHADER_SOURCE}"
+                COMMAND ${GLSLANG_EXECUTABLE} -V -o "${VULKAN_SHADER_SPV}" "${VULKAN_SHADER_SOURCE}"
                 DEPENDS "${VULKAN_SHADER_SOURCE}"
                 COMMENT "Compiling Vulkan shader rgb2yuv.comp (glslangValidator)"
                 VERBATIM)

packaging/linux/copr/Sunshine.spec

@@ -41,7 +41,6 @@ BuildRequires: libXinerama-devel
 BuildRequires: libXrandr-devel
 BuildRequires: libXtst-devel
 BuildRequires: openssl-devel
-BuildRequires: glslc
 BuildRequires: pipewire-devel
 BuildRequires: rpm-build
 BuildRequires: systemd-rpm-macros
@@ -53,6 +52,7 @@ BuildRequires: which
 # Fedora-specific BuildRequires
 BuildRequires: appstream
 # BuildRequires: boost-devel >= 1.86.0
+BuildRequires: glslc
 BuildRequires: libappstream-glib
 %if 0%{fedora} > 43
 # needed for npm from nvm
@@ -93,6 +93,7 @@ BuildRequires: npm
 BuildRequires: python311
 BuildRequires: python311-Jinja2
 BuildRequires: python311-setuptools
+BuildRequires: shaderc
 BuildRequires: udev
 # for unit tests
 BuildRequires: xvfb-run

packaging/sunshine.rb

@@ -96,6 +96,7 @@ class Sunshine < Formula
     depends_on "pango"
     depends_on "pipewire"
     depends_on "pulseaudio"
+    depends_on "shaderc"
     depends_on "systemd"
     depends_on "vulkan-loader"
     depends_on "wayland"