CMake: Major cleanup to support find_package(raylib)

Remove that link_libraries_to_executable() hack and defines a proper
raylib target that can be used with target_link_libraries.

The same target is also available for external (user) code by using
find_package(raylib).

This results in:

- Remove hardcoded build directories from examples and games CMakeLists.txt
- Allow rlgl_standalone and other special examples to be built easily
- Allow CMake projects to find_package(raylib instead of fiddling with pkg-config
- Makes code a little more maintainable
- Fixes #471, #606.
- Makes code less confusing by removing the double use of PLATFORM (#584).

Note that this is still not _The Right Way_(TM), because normally
raylib-config.cmake (or its includes) would be automatically generated.
I didn't manage to get that to work though, so I went the easier route
of just wrapping pkg_check_modules for consumption by find_package.

7 files changed, 41 insertions, 76 deletions

diff --git a/games/CMakeLists.txt b/games/CMakeLists.txt
index 563dbb61..d3f9d9fc 100644
--- a/games/CMakeLists.txt
+++ b/games/CMakeLists.txt
@@ -1,17 +1,9 @@
 # Setup the project and settings
 project(games)
 
-include("../cmake/utils.cmake")
-
-# Make sure raylib has been built
-# TODO `build` directory should maybe be something else...
-# TODO place somewhere else?
-include_directories("../build/release")
-
 # Get the source toegher
 file(GLOB sources *.c)
 
-message("PLATFORM = ${PLATFORM}")
 set(OUTPUT_EXT)
 
 if(${PLATFORM} MATCHES "Web")
@@ -20,18 +12,21 @@ if(${PLATFORM} MATCHES "Web")
   set(OUTPUT_EXT ".html")
 endif()
 
+if (NOT TARGET raylib)
+  find_package(raylib 2.0 REQUIRED)
+endif()
 
 # Do each game
 foreach(game_source ${sources})
   # Create the basename for the game
   get_filename_component(game_name ${game_source} NAME)
   string(REPLACE ".c" "${OUTPUT_EXT}" game_name ${game_name})
-  
+
   # Setup the game
   add_executable(${game_name} ${game_source})
 
   # Link the libraries
-  link_libraries_to_executable(${game_name})
+  target_link_libraries(${game_name} raylib)
 endforeach()
 
 # Do the games with subdirectories
diff --git a/games/drturtle/CMakeLists.txt b/games/drturtle/CMakeLists.txt
index bdd91970..f5778d9c 100644
--- a/games/drturtle/CMakeLists.txt
+++ b/games/drturtle/CMakeLists.txt
@@ -1,18 +1,13 @@
-# Setup the project and settings
+cmake_minimum_required(VERSION 2.6)
 project(drturtle)
 
-include("../../cmake/utils.cmake")
-
-
-# Make sure raylib has been built
-# TODO `build` directory should maybe be something else...
-include_directories("../../build/release")
-
 # Executable & linking
-add_executable(drturtle 06_drturtle_final.c)
-link_libraries_to_executable(drturtle)
+add_executable(${PROJECT_NAME} 06_drturtle_final.c)
+if (NOT TARGET raylib)
+  find_package(raylib 2.0 REQUIRED)
+endif()
+target_link_libraries(${PROJECT_NAME} raylib)
 
 # Resources
 # Copy all of the resource files to the destination
 file(COPY "resources/"  DESTINATION "resources/")
-
diff --git a/games/just_do/CMakeLists.txt b/games/just_do/CMakeLists.txt
index 4c5e1ee4..f25b6e37 100644
--- a/games/just_do/CMakeLists.txt
+++ b/games/just_do/CMakeLists.txt
@@ -1,21 +1,16 @@
-# Setup the project and settings
+cmake_minimum_required(VERSION 2.6)
 project(just_do)
 
-include("../../cmake/utils.cmake")
-
-
-# Make sure raylib has been built
-# TODO `build` directory should maybe be something else...
-include_directories("../../build/release")
-
 # Grab the screens
 file(GLOB screen_sources "screens/*.c")
 
 # Executable & linking
-add_executable(just_do just_do.c ${screen_sources})
-link_libraries_to_executable(just_do)
+add_executable(${PROJECT_NAME} ${PROJECT_NAME}.c ${screen_sources})
+if (NOT TARGET raylib)
+  find_package(raylib 2.0 REQUIRED)
+endif()
+target_link_libraries(${PROJECT_NAME} raylib)
 
 # Resources
 # Copy all of the resource files to the destination
 file(COPY "resources/"  DESTINATION "resources/")
-
diff --git a/games/koala_seasons/CMakeLists.txt b/games/koala_seasons/CMakeLists.txt
index f79ab911..7e500d1e 100644
--- a/games/koala_seasons/CMakeLists.txt
+++ b/games/koala_seasons/CMakeLists.txt
@@ -1,21 +1,16 @@
-# Setup the project and settings
+cmake_minimum_required(VERSION 2.6)
 project(koala_seasons)
 
-include("../../cmake/utils.cmake")
-
-
-# Make sure raylib has been built
-# TODO `build` directory should maybe be something else...
-include_directories("../../build/release")
-
 # Grab the screens
 file(GLOB screen_sources "screens/*.c")
 
 # Executable & linking
-add_executable(koala_seasons koala_seasons.c ${screen_sources})
-link_libraries_to_executable(koala_seasons)
+add_executable(${PROJECT_NAME} ${PROJECT_NAME}.c ${screen_sources})
+if (NOT TARGET raylib)
+  find_package(raylib 2.0 REQUIRED)
+endif()
+target_link_libraries(${PROJECT_NAME} raylib)
 
 # Resources
 # Copy all of the resource files to the destination
 file(COPY "resources/"  DESTINATION "resources/")
-
diff --git a/games/light_my_ritual/CMakeLists.txt b/games/light_my_ritual/CMakeLists.txt
index 11d2e4f4..a35a34e0 100644
--- a/games/light_my_ritual/CMakeLists.txt
+++ b/games/light_my_ritual/CMakeLists.txt
@@ -1,21 +1,16 @@
-# Setup the project and settings
+cmake_minimum_required(VERSION 2.6)
 project(light_my_ritual)
 
-include("../../cmake/utils.cmake")
-
-
-# Make sure raylib has been built
-# TODO `build` directory should maybe be something else...
-include_directories("../../build/release")
-
 # Grab the screens
 file(GLOB screen_sources "screens/*.c")
 
 # Executable & linking
-add_executable(light_my_ritual light_my_ritual.c ${screen_sources})
-link_libraries_to_executable(light_my_ritual)
+add_executable(${PROJECT_NAME} ${PROJECT_NAME}.c ${screen_sources})
+if (NOT TARGET raylib)
+  find_package(raylib 2.0 REQUIRED)
+endif()
+target_link_libraries(${PROJECT_NAME} raylib)
 
 # Resources
 # Copy all of the resource files to the destination
 file(COPY "resources/"  DESTINATION "resources/")
-
diff --git a/games/skully_escape/CMakeLists.txt b/games/skully_escape/CMakeLists.txt
index 337e1db5..51047ca1 100644
--- a/games/skully_escape/CMakeLists.txt
+++ b/games/skully_escape/CMakeLists.txt
@@ -1,21 +1,16 @@
-# Setup the project and settings
+cmake_minimum_required(VERSION 2.6)
 project(skully_escape)
 
-include("../../cmake/utils.cmake")
-
-
-# Make sure raylib has been built
-# TODO `build` directory should maybe be something else...
-include_directories("../../build/release")
-
 # Grab the screens
 file(GLOB screen_sources "screens/*.c")
 
 # Executable & linking
-add_executable(skully_escape skully_escape.c player.c monster.c ${screen_sources})
-link_libraries_to_executable(skully_escape)
+add_executable(${PROJECT_NAME} skully_escape.c player.c monster.c ${screen_sources})
+if (NOT TARGET raylib)
+  find_package(raylib 2.0 REQUIRED)
+endif()
+target_link_libraries(${PROJECT_NAME} raylib)
 
 # Resources
 # Copy all of the resource files to the destination
 file(COPY "resources/"  DESTINATION "resources/")
-
diff --git a/games/wave_collector/CMakeLists.txt b/games/wave_collector/CMakeLists.txt
index ca6c37b8..a87dbeda 100644
--- a/games/wave_collector/CMakeLists.txt
+++ b/games/wave_collector/CMakeLists.txt
@@ -1,21 +1,16 @@
-# Setup the project and settings
+cmake_minimum_required(VERSION 2.6)
 project(wave_collector)
 
-include("../../cmake/utils.cmake")
-
-
-# Make sure raylib has been built
-# TODO `build` directory should maybe be something else...
-include_directories("../../build/release")
-
 # Grab the screens
 file(GLOB screen_sources "screens/*.c")
 
 # Executable & linking
-add_executable(wave_collector wave_collector.c  ${screen_sources})
-link_libraries_to_executable(wave_collector)
+add_executable(${PROJECT_NAME} ${PROJECT_NAME}.c ${screen_sources})
+if (NOT TARGET raylib)
+  find_package(raylib 2.0 REQUIRED)
+endif()
+target_link_libraries(${PROJECT_NAME} raylib)
 
 # Resources
 # Copy all of the resource files to the destination
 file(COPY "resources/"  DESTINATION "resources/")
-