cmake: find SDL automatically or add it from sources

CMakeLists.txt

@@ -3,13 +3,18 @@ project(Avocado)
 
 set(CMAKE_CXX_STANDARD 17)
 
+option(FORCE_BUILD_SDL "Force build SDL2 from sources." OFF)
+
+set(CMAKE_CXX_FLAGS_RELEASE "-Ofast")
+add_compile_options(-mavx2 -m64)
+add_link_options(-mavx2 -m64)
+
 find_program(CCACHE_FOUND ccache)
 if(CCACHE_FOUND)
     set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
     set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
 endif()
 
-
 if(NOT CMAKE_BUILD_TYPE)
     message(STATUS "Building as Release")
     set(CMAKE_BUILD_TYPE "Release")
@@ -36,7 +41,10 @@ target_include_directories(event_bus INTERFACE externals/EventBus/lib/include)
 
 ##############################################
 # stb_image
-add_library(stb_image INTERFACE)
+add_library(stb_image STATIC
+        externals/stb/stb_image.c
+        externals/stb/stb_image_write.c
+)
 target_include_directories(stb_image INTERFACE externals/stb)
 
 ##############################################
@@ -161,6 +169,21 @@ target_include_directories(json INTERFACE externals/json/include)
 add_library(filesystem INTERFACE)
 target_include_directories(filesystem INTERFACE externals/filesystem/include)
 
+##############################################
+# SDL
+if (FORCE_BUILD_SDL)
+    message(STATUS "Force building SDL2 from sources")
+    add_subdirectory(externals/SDL2)
+else()
+    find_package(SDL2)
+    if (NOT SDL2_FOUND)
+        message(STATUS "SDL2 not found, compiling from source")
+        add_subdirectory(externals/SDL2)
+    else()
+        message(STATUS "SDL2 found")
+    endif()
+endif()
+
 ##############################################
 # core
 add_library(core STATIC
@@ -278,7 +301,6 @@ set(SOURCES
         src/platform/windows/gui/options/bios.cpp
         src/platform/windows/gui/options/memory_card.cpp
         src/platform/windows/gui/options/options.cpp
-        src/platform/windows/gui/stb_image.cpp
         src/platform/windows/gui/toasts.cpp
         src/platform/windows/input/key.cpp
         src/platform/windows/input/sdl_input_manager.cpp
@@ -295,8 +317,6 @@ set(SOURCES
         src/renderer/opengl/shader/vertex_array_object.cpp
         )
 
-find_package(SDL2 REQUIRED)
-
 add_executable(avocado ${SOURCES})
 
 target_include_directories(avocado
@@ -312,4 +332,6 @@ target_link_libraries(avocado
         json
         SDL2::SDL2
         filesystem
-        )
+        )
+
+# set_property(TARGET avocado PROPERTY INTERPROCEDURAL_OPTIMIZATION True)

externals/stb/stb_image.c

@@ -1,2 +1,2 @@
 #define STB_IMAGE_IMPLEMENTATION
-#include <stb_image.h>
+#include "stb_image.h"

externals/stb/stb_image_write.c

@@ -0,0 +1,2 @@
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"

premake/stb.lua

@@ -0,0 +1,12 @@
+group "externals"
+project "stb"
+	uuid "70748C53-02F2-42E7-AE0A-8CBD19918850"
+	kind "StaticLib"
+	language "c"
+	location "../build/libs/stb"
+	includedirs { 
+		"../externals/stb"
+	}
+	files { 
+		"../externals/stb/*.c",
+	}

premake5.lua

@@ -144,6 +144,7 @@ include "premake/imgui.lua"
 include "premake/lzma.lua"
 include "premake/miniz.lua"
 include "premake/fmt.lua"
+include "premake/stb.lua"
 
 project "core"
 	uuid "176665c5-37ff-4a42-bef8-02edaeb1b426"
@@ -179,6 +180,7 @@ project "core"
 		"flac",
 		"chdr",
 		"fmt",
+		"stb",
 	}
 
 	if _ACTION ~= nil then
@@ -212,6 +214,7 @@ project "avocado"
 		"lzma",
 		"flac",
 		"fmt",
+		"stb",
 	}
 
 	filter "options:headless"