Properly rebuild resource file if shader changes (#53)

Unfortunately CMAKE_AUTORCC does not properly add dependencies on the
files included by the qrc file. This means that when a file changes that
is included in the qrc file, the qrc file is not automatically rebuilt.
This results in broken builds.

Fix this by building the qrc file directly (instead of relying on
CMAKE_AUTORCC) and adding proper dependencies.

As a side cleanup, move the resources.qrc file to resources/, so the
top-level directory is cleaner.

Author: tbleher

Diff for: CMakeLists.txt

@@ -8,7 +8,7 @@ set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTOUIC ON)
-set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTORCC OFF)
 
 find_package(Qt5 COMPONENTS Core Gui OpenGL Widgets Xml Network REQUIRED)
 
@@ -24,6 +24,24 @@ find_library(
   HINTS /usr/lib/fmi-library /usr/lib /usr/local/lib/fmi-library /usr/local/lib
 )
 
+# Unfortunately CMAKE_AUTORCC does not automatically rebuild the qrc file if one
+# of the contained files changes. Set up rcc manually to ensure correct builds
+# even if e.g. the shaders change.
+set(RCC_OUTPUT_FILE ${CMAKE_CURRENT_BINARY_DIR}/rcc_resources.cpp)
+add_custom_command(OUTPUT ${RCC_OUTPUT_FILE}
+    COMMAND ${Qt5Core_RCC_EXECUTABLE}
+    ARGS -o ${RCC_OUTPUT_FILE}
+         resources.qrc
+    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/resources
+    MAIN_DEPENDENCY resources/resources.qrc
+    DEPENDS resources/Shaders/FragmentShader.frag
+            resources/Shaders/VertexShader.vert
+            resources/Images/Grid.png
+    VERBATIM)
+set_property(SOURCE ${RCC_OUTPUT_FILE} PROPERTY SKIP_AUTOMOC ON)
+set_property(SOURCE ${RCC_OUTPUT_FILE} PROPERTY SKIP_AUTOUIC ON)
+set_property(SOURCE ${RCC_OUTPUT_FILE} PROPERTY SKIP_AUTOGEN ON)
+
 set(SOURCES
     src/main.cpp
     src/mainwindow.cpp
@@ -47,7 +65,7 @@ set(SOURCES
     src/glfieldofview.cpp
     src/fmureceiver.cpp
     src/utils.cpp
-    resources.qrc
+    ${CMAKE_CURRENT_BINARY_DIR}/rcc_resources.cpp
 )
 
 set(HEADERS

Diff for: resources.qrc

@@ -0,0 +1,7 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>Shaders/FragmentShader.frag</file>
+    <file>Shaders/VertexShader.vert</file>
+    <file>Images/Grid.png</file>
+</qresource>
+</RCC>