citra-qt: Add Dark theme from https://github.com/ColinDuquesnoy/QDarkStyleSheet

dist/qt_themes/qdarkstyle/style.qrc

@@ -0,0 +1,46 @@
+<RCC>
+  <qresource prefix="qss_icons">
+    <file>rc/up_arrow_disabled.png</file>
+    <file>rc/Hmovetoolbar.png</file>
+    <file>rc/stylesheet-branch-end.png</file>
+    <file>rc/branch_closed-on.png</file>
+    <file>rc/stylesheet-vline.png</file>
+    <file>rc/branch_closed.png</file>
+    <file>rc/branch_open-on.png</file>
+    <file>rc/transparent.png</file>
+    <file>rc/right_arrow_disabled.png</file>
+    <file>rc/sizegrip.png</file>
+    <file>rc/close.png</file>
+    <file>rc/close-hover.png</file>
+    <file>rc/close-pressed.png</file>
+    <file>rc/down_arrow.png</file>
+    <file>rc/Vmovetoolbar.png</file>
+    <file>rc/left_arrow.png</file>
+    <file>rc/stylesheet-branch-more.png</file>
+    <file>rc/up_arrow.png</file>
+    <file>rc/right_arrow.png</file>
+    <file>rc/left_arrow_disabled.png</file>
+    <file>rc/Hsepartoolbar.png</file>
+    <file>rc/branch_open.png</file>
+    <file>rc/Vsepartoolbar.png</file>
+    <file>rc/down_arrow_disabled.png</file>
+    <file>rc/undock.png</file>
+    <file>rc/checkbox_checked_disabled.png</file>
+    <file>rc/checkbox_checked_focus.png</file>
+    <file>rc/checkbox_checked.png</file>
+    <file>rc/checkbox_indeterminate.png</file>
+    <file>rc/checkbox_indeterminate_focus.png</file>
+    <file>rc/checkbox_unchecked_disabled.png</file>
+    <file>rc/checkbox_unchecked_focus.png</file>
+    <file>rc/checkbox_unchecked.png</file>
+    <file>rc/radio_checked_disabled.png</file>
+    <file>rc/radio_checked_focus.png</file>
+    <file>rc/radio_checked.png</file>
+    <file>rc/radio_unchecked_disabled.png</file>
+    <file>rc/radio_unchecked_focus.png</file>
+    <file>rc/radio_unchecked.png</file>
+  </qresource>
+  <qresource prefix="qdarkstyle">
+      <file>style.qss</file>
+  </qresource>
+</RCC>

src/citra_qt/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR}/CMakeModules)
 
@@ -75,6 +76,8 @@ set(UIS
             main.ui
             )
 
+file(GLOB_RECURSE THEMES ${CMAKE_SOURCE_DIR}/dist/qt_themes/*)
+
 create_directory_groups(${SRCS} ${HEADERS} ${UIS})
 
 if (Qt5_FOUND)
@@ -86,10 +89,10 @@ endif()
 if (APPLE)
     set(MACOSX_ICON "../../dist/citra.icns")
     set_source_files_properties(${MACOSX_ICON} PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
-    add_executable(citra-qt MACOSX_BUNDLE ${SRCS} ${HEADERS} ${UI_HDRS} ${MACOSX_ICON})
+    add_executable(citra-qt MACOSX_BUNDLE ${SRCS} ${HEADERS} ${UI_HDRS} ${THEMES} ${MACOSX_ICON})
     set_target_properties(citra-qt PROPERTIES MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/Info.plist)
 else()
-    add_executable(citra-qt ${SRCS} ${HEADERS} ${UI_HDRS})
+    add_executable(citra-qt ${SRCS} ${HEADERS} ${UI_HDRS} ${THEMES})
 endif()
 target_link_libraries(citra-qt PRIVATE audio_core common core input_common video_core)
 target_link_libraries(citra-qt PRIVATE Boost::boost glad nihstro-headers Qt5::OpenGL Qt5::Widgets)