~ Initial SDL2 implementation

Limitation
- Dependent projects need to set NAZARA_PLATFORM_SDL2 if nazara has been build with SDL2 since OpenGL.hpp (and maybe some other headers) exposes platform details
- SDL2 window doesn't supports async window since the API isn't fitting for now
- Contexts parameters can't be changed until we close all the SDL windows (SDL limitation)

build/scripts/modules/renderer.lua

@@ -12,23 +12,35 @@ MODULE.Libraries = {
 	"NazaraPlatform"
 }
 
-MODULE.OsFiles.Windows = {
-	"../src/Nazara/Renderer/Win32/**.hpp",
-	"../src/Nazara/Renderer/Win32/**.cpp"
-}
+if Config.PlatformSDL2 then
+    table.insert(MODULE.Defines, "NAZARA_PLATFORM_SDL2")
 
-MODULE.OsFiles.Posix = {
-	"../src/Nazara/Renderer/GLX/**.hpp",
-	"../src/Nazara/Renderer/GLX/**.cpp"
-}
+    table.insert(MODULE.Files, "../src/Nazara/Renderer/SDL2/**.hpp")
+    table.insert(MODULE.Files, "../src/Nazara/Renderer/SDL2/**.cpp")
 
-MODULE.OsLibraries.Windows = {
-	"gdi32",
-	"opengl32",
-	"winmm"
-}
+    MODULE.FilesExcluded = {
+        "../src/Nazara/Renderer/Win32/**",
+        "../src/Nazara/Renderer/GLX/**.cpp"
+    }
+else
+    MODULE.OsFiles.Windows = {
+        "../src/Nazara/Renderer/Win32/**.hpp",
+        "../src/Nazara/Renderer/Win32/**.cpp"
+    }
 
-MODULE.OsLibraries.Posix = {
-	"GL",
-	"X11"
-}
+    MODULE.OsFiles.Posix = {
+        "../src/Nazara/Renderer/GLX/**.hpp",
+        "../src/Nazara/Renderer/GLX/**.cpp"
+    }
+
+    MODULE.OsLibraries.Windows = {
+        "gdi32",
+        "opengl32",
+        "winmm"
+    }
+
+    MODULE.OsLibraries.Posix = {
+        "GL",
+        "X11"
+    }
+end