Jamboot

Minimalist boilerplate for procedural games using SDL2+OpenGL2.1.

Features

• Cross-platform window creation and GL initialization
• Gamepad, Mouse, and Keyboard input
• Manage yer shaders

Not Features

• No components
• No particles
• No mobile
• No steam
• No sound (yet)

CMake scripts

This document doubles as a bootstrapping script in literate Perl.

CMake has problems detecting SDL2 and GLEW. OpenGL itself is usually detected fine, but that's about it.

Let's generate a FindGLEW.cmake and a FindSDL2.cmake.

mkdir('cmake') or die 'trying';
mkdir('cmake/Modules') or die 'trying';

The former was taken directly from a recent version of CMake and stripped down somewhat. It should still work with older CMakes.

open(my $fh, '>', 'cmake/Modules/FindGLEW.cmake') or die "Could not open file 'FindGLEW.cmake' $!";
print $fh <<'HERE';
find_path(GLEW_INCLUDE_DIR GL/glew.h)
find_library(GLEW_LIBRARY NAMES GLEW glew32 glew glew32s PATH_SUFFIXES lib64)
set(GLEW_INCLUDE_DIRS ${GLEW_INCLUDE_DIR})
set(GLEW_LIBRARIES ${GLEW_LIBRARY})
find_package_handle_standard_args(GLEW REQUIRED_VARS GLEW_INCLUDE_DIR GLEW_LIBRARY)
if(GLEW_FOUND AND NOT TARGET GLEW::GLEW)
  add_library(GLEW::GLEW UNKNOWN IMPORTED)
  set_target_properties(GLEW::GLEW PROPERTIES
    IMPORTED_LOCATION "${GLEW_LIBRARY}"
    INTERFACE_INCLUDE_DIRECTORIES "${GLEW_INCLUDE_DIRS}")
endif()
mark_as_advanced(GLEW_INCLUDE_DIR GLEW_LIBRARY)
HERE
close $fh;

The latter was swiped courtesy of GitHub user tcbrindle, and also stripped down.

open(my $fh, '>', 'cmake/Modules/FindSDL2.cmake') or die "Could not open file 'FindSDL2.cmake' $!";
	print $fh <<'THERE';
	message("<FindSDL2.cmake>")
	SET(SDL2_SEARCH_PATHS
		~/Library/Frameworks
		/Library/Frameworks
		/usr/local
		/usr
		/sw # Fink
		/opt/local # DarwinPorts
		/opt/csw # Blastwave
		/opt
		${SDL2_PATH}
	)
	FIND_PATH(SDL2_INCLUDE_DIR SDL.h
		HINTS
		$ENV{SDL2DIR}
		PATH_SUFFIXES include/SDL2 include
		PATHS ${SDL2_SEARCH_PATHS}
	)
	FIND_LIBRARY(SDL2_LIBRARY_TEMP
		NAMES SDL2
		HINTS
		$ENV{SDL2DIR}
		PATH_SUFFIXES lib64 lib
		PATHS ${SDL2_SEARCH_PATHS}
	)
	IF(NOT SDL2_BUILDING_LIBRARY)
		IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
			# Non-OS X framework versions expect you to also dynamically link to
			# SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
			# seem to provide SDL2main for compatibility even though they don't
			# necessarily need it.
			FIND_LIBRARY(SDL2MAIN_LIBRARY
				NAMES SDL2main
				HINTS
				$ENV{SDL2DIR}
				PATH_SUFFIXES lib64 lib
				PATHS ${SDL2_SEARCH_PATHS}
			)
		ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
	ENDIF(NOT SDL2_BUILDING_LIBRARY)
	IF(NOT APPLE)
		FIND_PACKAGE(Threads)
	ENDIF(NOT APPLE)
	IF(MINGW)
		SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
	ENDIF(MINGW)
	IF(SDL2_LIBRARY_TEMP)
		# For SDL2main
		IF(NOT SDL2_BUILDING_LIBRARY)
			IF(SDL2MAIN_LIBRARY)
				SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
			ENDIF(SDL2MAIN_LIBRARY)
		ENDIF(NOT SDL2_BUILDING_LIBRARY)
		IF(APPLE)
			SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
		ENDIF(APPLE)
		IF(NOT APPLE)
			SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
		ENDIF(NOT APPLE)
		IF(MINGW)
			SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
		ENDIF(MINGW)
		SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")
		SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
	ENDIF(SDL2_LIBRARY_TEMP)
	message("</FindSDL2.cmake>")
	INCLUDE(FindPackageHandleStandardArgs)
	FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)
	THERE
close $fh;