Big cmake changes (#1514)

* Delete emscripten.cmake

This file is not needed at this point. EMSDK provides a toolchain file that has a lot more things in it and is better supported. Project currently works fine with the documentation provided in Emscripten SDK on how to build projects.

* First pass file separation.

The main two files are cleaner now. Only important things can be seen. Major changes include:
- raylib_static is now the alias instead of raylib
- Repeating segments are removed and pulled into separate files into <root>/cmake
- File is reordered to make more sense
- Installs are better structured
- Library is build into an output directory "raylib" instead of "src"
- All public header files are now set as a public header file
- Source files need to be listed (it is a bad practice to capture them using wildcards and file globs)
- CMakeLists are better commented

* Second pass on the example dirs.

They are quite complex so I'm more hesitant to do major changes. Also it works pretty well. Noticed that I forgot one of the seperated files and added it into src/CMakeLists.txt.

* Returned the header copy as it was convenient to have the public headers copied.

* A better description to the variable RAYLIB_IS_MAIN

Co-authored-by: Rob Loach <[email protected]>

* Remove debug message

Co-authored-by: Rob Loach <[email protected]>

* Improvements based on review.

* Simplify the install condition to not be platform specific as it was before.

Co-authored-by: Alexander Neumann <[email protected]>

* Remove some CMAKE variables as they don't affect the build in any way

Co-authored-by: Alexander Neumann <[email protected]>

Co-authored-by: Rob Loach <[email protected]>
Co-authored-by: Alexander Neumann <[email protected]>

1 files changed, 109 insertions, 0 deletions

diff --git a/cmake/LibraryConfigurations.cmake b/cmake/LibraryConfigurations.cmake
new file mode 100644
index 00000000..8cca2464
--- /dev/null
+++ b/cmake/LibraryConfigurations.cmake
@@ -0,0 +1,109 @@
+
+### Config options ###
+# Translate the config options to what raylib wants
+configure_file(config.h.in ${CMAKE_BINARY_DIR}/cmake/config.h)
+
+if(${PLATFORM} MATCHES "Desktop")
+    set(PLATFORM_CPP "PLATFORM_DESKTOP")
+    
+    if(APPLE)
+        # Need to force OpenGL 3.3 on OS X
+        # See: https://github.com/raysan5/raylib/issues/341
+        set(GRAPHICS "GRAPHICS_API_OPENGL_33")
+        find_library(OPENGL_LIBRARY OpenGL)
+        set(LIBS_PRIVATE ${OPENGL_LIBRARY})
+        link_libraries("${LIBS_PRIVATE}")
+        if (NOT CMAKE_SYSTEM STRLESS "Darwin-18.0.0")
+            add_definitions(-DGL_SILENCE_DEPRECATION)
+            MESSAGE(AUTHOR_WARNING "OpenGL is deprecated starting with macOS 10.14 (Mojave)!")
+        endif()
+    elseif(WIN32)
+        add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+        set(LIBS_PRIVATE ${LIBS_PRIVATE} winmm)
+    else()
+        find_library(pthread NAMES pthread)
+        find_package(OpenGL QUIET)
+        if ("${OPENGL_LIBRARIES}" STREQUAL "")
+            set(OPENGL_LIBRARIES "GL")
+        endif()
+        
+        if ("${CMAKE_SYSTEM_NAME}" MATCHES "(Net|Open)BSD")
+            find_library(OSS_LIBRARY ossaudio)
+        endif()
+        
+        set(LIBS_PRIVATE m pthread ${OPENGL_LIBRARIES} ${OSS_LIBRARY})
+    endif()
+
+elseif(${PLATFORM} MATCHES "Web")
+    set(PLATFORM_CPP "PLATFORM_WEB")
+    set(GRAPHICS "GRAPHICS_API_OPENGL_ES2")
+    set(CMAKE_C_FLAGS "-s USE_GLFW=3 -s ASSERTIONS=1 --profiling")
+    set(CMAKE_STATIC_LIBRARY_SUFFIX ".a")
+
+elseif(${PLATFORM} MATCHES "Android")
+    set(PLATFORM_CPP "PLATFORM_ANDROID")
+    set(GRAPHICS "GRAPHICS_API_OPENGL_ES2")
+    include(AddIfFlagCompiles)
+    add_if_flag_compiles(-ffunction-sections CMAKE_C_FLAGS)
+    add_if_flag_compiles(-funwind-tables CMAKE_C_FLAGS)
+    add_if_flag_compiles(-fstack-protector-strong CMAKE_C_FLAGS)
+    set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+    add_if_flag_compiles(-Wa,--noexecstack CMAKE_C_FLAGS)
+    add_if_flag_compiles(-no-canonical-prefixes CMAKE_C_FLAGS)
+    add_definitions(-DANDROID -D__ANDROID_API__=21)
+    include_directories(external/android/native_app_glue)
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--exclude-libs,libatomic.a -Wl,--build-id -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -Wl,--warn-shared-textrel -Wl,--fatal-warnings -uANativeActivity_onCreate")
+    
+    find_library(OPENGL_LIBRARY OpenGL)
+    set(LIBS_PRIVATE m log android EGL GLESv2 OpenSLES atomic c)
+
+elseif(${PLATFORM} MATCHES "Raspberry Pi")
+    set(PLATFORM_CPP "PLATFORM_RPI")
+    set(GRAPHICS "GRAPHICS_API_OPENGL_ES2")
+    
+    add_definitions(-D_DEFAULT_SOURCE)
+    
+    find_library(GLESV2 brcmGLESv2 HINTS /opt/vc/lib)
+    find_library(EGL brcmEGL HINTS /opt/vc/lib)
+    find_library(BCMHOST bcm_host HINTS /opt/vc/lib)
+    include_directories(/opt/vc/include /opt/vc/include/interface/vmcs_host/linux /opt/vc/include/interface/vcos/pthreads)
+    link_directories(/opt/vc/lib)
+    set(LIBS_PRIVATE ${GLESV2} ${EGL} ${BCMHOST} pthread rt m dl)
+
+elseif(${PLATFORM} MATCHES "DRM")
+    set(PLATFORM_CPP "PLATFORM_DRM")
+    set(GRAPHICS "GRAPHICS_API_OPENGL_ES2")
+    
+    add_definitions(-D_DEFAULT_SOURCE)
+    add_definitions(-DEGL_NO_X11)
+    add_definitions(-DPLATFORM_DRM)
+    
+    find_library(GLESV2 GLESv2)
+    find_library(EGL EGL)
+    find_library(DRM drm)
+    find_library(GBM gbm)
+    
+    include_directories(/usr/include/libdrm)
+    set(LIBS_PRIVATE ${GLESV2} ${EGL} ${DRM} ${GBM} pthread m dl)
+
+endif()
+
+if (${OPENGL_VERSION})
+    set(${SUGGESTED_GRAPHICS} "${GRAPHICS}")
+    if (${OPENGL_VERSION} MATCHES "3.3")
+        set(GRAPHICS "GRAPHICS_API_OPENGL_33")
+    elseif (${OPENGL_VERSION} MATCHES "2.1")
+        set(GRAPHICS "GRAPHICS_API_OPENGL_21")
+    elseif (${OPENGL_VERSION} MATCHES "1.1")
+        set(GRAPHICS "GRAPHICS_API_OPENGL_11")
+    elseif (${OPENGL_VERSION} MATCHES "ES 2.0")
+        set(GRAPHICS "GRAPHICS_API_OPENGL_ES2")
+    endif()
+    if ("${SUGGESTED_GRAPHICS}" AND NOT "${SUGGESTED_GRAPHICS}" STREQUAL "${GRAPHICS}")
+        message(WARNING "You are overriding the suggested GRAPHICS=${SUGGESTED_GRAPHICS} with ${GRAPHICS}! This may fail")
+    endif()
+endif()
+
+if(NOT GRAPHICS)
+    set(GRAPHICS "GRAPHICS_API_OPENGL_33")
+endif()
\ No newline at end of file