Add: introduce CMake for project management

CMake works on all our supported platforms, like MSVC, Mingw, GCC,
Clang, and many more. It allows for a single way of doing things,
so no longer we need shell scripts and vbs scripts to work on all
our supported platforms.

Additionally, CMake allows to generate project files for like MSVC,
KDevelop, etc.

This heavily reduces the lines of code we need to support multiple
platforms from a project perspective.

Addtiionally, this heavily improves our detection of libraries, etc.

1 files changed, 65 insertions, 0 deletions

diff --git a/cmake/FindAllegro.cmake b/cmake/FindAllegro.cmake
new file mode 100644
index 000000000..85b2ffd39
--- /dev/null
+++ b/cmake/FindAllegro.cmake
@@ -0,0 +1,65 @@
+#[=======================================================================[.rst:
+FindAllegro
+-------
+
+Finds the allegro library.
+
+Result Variables
+^^^^^^^^^^^^^^^^
+
+This will define the following variables:
+
+``Allegro_FOUND``
+  True if the system has the allegro library.
+``Allegro_INCLUDE_DIRS``
+  Include directories needed to use allegro.
+``Allegro_LIBRARIES``
+  Libraries needed to link to allegro.
+``Allegro_VERSION``
+  The version of the allegro library which was found.
+
+Cache Variables
+^^^^^^^^^^^^^^^
+
+The following cache variables may also be set:
+
+``Allegro_INCLUDE_DIR``
+  The directory containing ``allegro.h``.
+``Allegro_LIBRARY``
+  The path to the allegro library.
+
+#]=======================================================================]
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_Allegro QUIET allegro)
+
+find_path(Allegro_INCLUDE_DIR
+    NAMES allegro.h
+    PATHS ${PC_Allegro_INCLUDE_DIRS}
+)
+
+find_library(Allegro_LIBRARY
+    NAMES alleg
+    PATHS ${PC_Allegro_LIBRARY_DIRS}
+)
+
+set(Allegro_VERSION ${PC_Allegro_VERSION})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Allegro
+    FOUND_VAR Allegro_FOUND
+    REQUIRED_VARS
+        Allegro_LIBRARY
+        Allegro_INCLUDE_DIR
+    VERSION_VAR Allegro_VERSION
+)
+
+if (Allegro_FOUND)
+    set(Allegro_LIBRARIES ${Allegro_LIBRARY})
+    set(Allegro_INCLUDE_DIRS ${Allegro_INCLUDE_DIR})
+endif ()
+
+mark_as_advanced(
+    Allegro_INCLUDE_DIR
+    Allegro_LIBRARY
+)