Fixed bug 2683 - Raspberry PI support using CMake

Tobias Himmer

this patch adds a check to the CMake build script to detect whether the VideoCore API is available.
If it is found, it enables SDL_VIDEO_DRIVER_RPI and will also add the needed include/library directory flags to CMAKE_C_FLAGS so the subsequent check for GLES succeeds in picking up the headers.

Seems to work fine on Raspbian.

CMakeLists.txt

@@ -237,6 +237,7 @@ set_option(INPUT_TSLIB         "Use the Touchscreen library for input" ${UNIX_SY
 set_option(VIDEO_X11           "Use X11 video driver" ${UNIX_SYS})
 set_option(VIDEO_WAYLAND       "Use Wayland video driver" ${UNIX_SYS})
 set_option(VIDEO_MIR           "Use Mir video driver" ${UNIX_SYS})
+set_option(VIDEO_RPI           "Use Raspberry Pi video driver" ${UNIX_SYS})
 dep_option(X11_SHARED          "Dynamically load X11 support" ON "VIDEO_X11" OFF)
 set(SDL_X11_OPTIONS Xcursor Xinerama XInput Xrandr Xscrnsaver XShape Xvm)
 foreach(_SUB ${SDL_X11_OPTIONS})
@@ -658,6 +659,8 @@ if(UNIX AND NOT APPLE)
   endif()
 
   if(SDL_VIDEO)
+    # Need to check for Raspberry PI first and add platform specific compiler flags, otherwise the test for GLES fails!
+    CheckRPI()
     CheckX11()
     CheckMir()
     CheckDirectFB()

cmake/sdlchecks.cmake

@@ -917,3 +917,32 @@ macro(CheckUSBHID)
     set(CMAKE_REQUIRED_FLAGS)
   endif(HAVE_USBHID)
 endmacro(CheckUSBHID)
+
+# Requires:
+# - n/a
+macro(CheckRPI)
+  if(VIDEO_RPI)
+    set(VIDEO_RPI_INCLUDE_DIRS "/opt/vc/include" "/opt/vc/include/interface/vcos/pthreads" "/opt/vc/include/interface/vmcs_host/linux/" )
+    set(VIDEO_RPI_LIBRARY_DIRS "/opt/vc/lib" )
+    set(VIDEO_RPI_LIBS bcm_host )
+    listtostr(VIDEO_RPI_INCLUDE_DIRS VIDEO_RPI_INCLUDE_FLAGS "-I")
+    listtostr(VIDEO_RPI_LIBRARY_DIRS VIDEO_RPI_LIBRARY_FLAGS "-L")
+
+    set(CMAKE_REQUIRED_FLAGS "${VIDEO_RPI_INCLUDE_FLAGS} ${VIDEO_RPI_LIBRARY_FLAGS}")
+    set(CMAKE_REQUIRED_LIBRARIES "${VIDEO_RPI_LIBS}")
+    check_c_source_compiles("
+        #include <bcm_host.h>
+        int main(int argc, char **argv) {}" HAVE_VIDEO_RPI)
+    set(CMAKE_REQUIRED_FLAGS)
+    set(CMAKE_REQUIRED_LIBRARIES)
+
+    if(SDL_VIDEO AND HAVE_VIDEO_RPI)
+      set(HAVE_SDL_VIDEO TRUE)
+      set(SDL_VIDEO_DRIVER_RPI 1)
+      file(GLOB VIDEO_RPI_SOURCES ${SDL2_SOURCE_DIR}/src/video/raspberry/*.c)
+      set(SOURCE_FILES ${SOURCE_FILES} ${VIDEO_RPI_SOURCES})
+      list(APPEND EXTRA_LIBS ${VIDEO_RPI_LIBS})
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${VIDEO_RPI_INCLUDE_FLAGS} ${VIDEO_RPI_LIBRARY_FLAGS}")
+    endif(SDL_VIDEO AND HAVE_VIDEO_RPI)
+  endif(VIDEO_RPI)
+endmacro(CheckRPI)

include/SDL_config.h.cmake

@@ -264,6 +264,7 @@
 #cmakedefine SDL_VIDEO_DRIVER_DUMMY @SDL_VIDEO_DRIVER_DUMMY@
 #cmakedefine SDL_VIDEO_DRIVER_WINDOWS @SDL_VIDEO_DRIVER_WINDOWS@
 #cmakedefine SDL_VIDEO_DRIVER_WAYLAND @SDL_VIDEO_DRIVER_WAYLAND@
+#cmakedefine SDL_VIDEO_DRIVER_RPI @SDL_VIDEO_DRIVER_RPI@
 
 #if 0
 /* !!! FIXME: in configure script version, missing here: */