adding functional premake

premake5.lua

@@ -1,37 +1,63 @@
 backends = {
-	glx = {"GLX", {"X11"}},
-	wgl = {"WGL", {"gdi32"}},
-	glfw = {"GLFW", {"glfw"}}
+	opengl = {
+		name = "OpenGL",
+		default = "glfw",
+		unix = {"GL", "GLU"},
+		windows = {"opengl32", "glu32"},
+		backends = {
+			glx = {"GLX", {"X11"}},
+			wgl = {"WGL", {"gdi32"}},
+			glfw = {"GLFW", {"glfw"}}
+		}
+	}
 }
 
-plt = {}
-
-for k,v in pairs(backends) do
-	table.insert(plt, "Native-" .. v[1])
-	if not(v[1] == "GLX") then
-		table.insert(plt, "Win32-" .. v[1])
-		table.insert(plt, "Win64-" .. v[1])
-	end
-end
-
 workspace("NishBox")
 	configurations({
 		"Debug",
 		"Release"
 	})
-	platforms(plt)
-	defaultplatform("Native-GLX")
+	platforms({
+		"Native",
+		"Win32",
+		"Win64"
+	})
+	defaultplatform("Native")
 
-filter("platforms:Win32-*")
+filter("platforms:Win32")
 	system("windows")
 	architecture("x86")
 	gccprefix("i686-w64-mingw32-")
 
-filter("platforms:Win64-*")
+filter("platforms:Win64")
 	system("windows")
 	architecture("x86_64")
 	gccprefix("x86_64-w64-mingw32-")
 
+l = {}
+for k,v in pairs(backends) do
+	allowed = {}
+	for k2,v2 in pairs(v["backends"]) do
+		table.insert(allowed, {k2, v2[1]})
+	end
+	newoption({
+		trigger = k,
+		value = "API",
+		description = "Choose a backend for " .. v["name"],
+		allowed = allowed,
+		default = v["default"]
+	})
+	table.insert(l, {k, v["name"]})
+end
+
+newoption({
+	trigger = "backend",
+	value = "API",
+	description = "Choose a backend for rendering",
+	allowed = l,
+	default = "opengl"
+})
+
 newaction({
 	trigger = "clean",
 	description = "Clean the files",
@@ -55,7 +81,7 @@ function default_stuffs()
 		defines({
 			"THREAD_POSIX"
 		})
-	filter("platforms:Native-*")
+	filter("platforms:Native")
 		includedirs({
 			"/usr/local/include",
 			"/usr/X11R*/include"
@@ -65,7 +91,7 @@ function default_stuffs()
 			"/usr/X11R*/lib"
 		})
 	filter({
-		"platforms:Native-*",
+		"platforms:Native",
 		"system:bsd"
 	})
 		includedirs({
@@ -76,11 +102,16 @@ function default_stuffs()
 		})
 
 	for k,v in pairs(backends) do
-		filter("platforms:*-" .. k)
-			defines({
-				"DRV_OPENGL",
-				"USE_" .. string.upper(k)
+		for k2,v2 in pairs(v["backends"]) do
+			filter({
+				"options:backend=" .. k,
+				"options:" .. k .. "=" .. k2
 			})
+				defines({
+					"DRV_" .. string.upper(k),
+					"USE_" .. string.upper(k2)
+				})
+		end
 	end
 
 	filter({})
@@ -108,27 +139,37 @@ project("NishBox")
 		"ode"
 	})
 	default_stuffs()
-	for k,v in pairs(backends) do
-		filter("platforms:*-" .. k)
-			links(v[2])
-	end
 	filter("toolset:gcc or toolset:clang")
 		links({
 			"stdc++"
 		})
+	for k,v in pairs(backends) do
+		for k2,v2 in pairs(v["backends"]) do
+			filter({
+				"options:backend=" .. k,
+				"options:" .. k .. "=" .. k2,
+				"system:windows"
+			})
+				links(v.windows)
+				links(v2[2])
+			filter({
+				"options:backend=" .. k,
+				"options:" .. k .. "=" .. k2,
+				"system:not windows"
+			})
+				links(v.unix)
+				links(v2[2])
+		end
+	end
 	filter("system:windows")
 		files({
 			"src/*.rc"
 		})
 		links({
-			"opengl32",
-			"glu32",
 			"ws2_32"
 		})
 	filter("system:not windows")
 		links({
-			"GL",
-			"GLU",
 			"pthread"
 		})
 	filter("configurations:Debug")
@@ -175,9 +216,14 @@ project("NishEngine")
 			"engine/thread/posix/ne_thread.c"
 		})
 	for k,v in pairs(backends) do
-		filter("platforms:*-" .. k)
-			files({
-				"engine/graphic/opengl/" .. k .. "/ne_draw.c",
-				"engine/graphic/opengl/*.c"
+		for k2,v2 in pairs(v["backends"]) do
+			filter({
+				"options:backend=" .. k,
+				"options:" .. k .. "=" .. k2
 			})
+				files({
+					"engine/graphic/" .. k .. "/*.c",
+					"engine/graphic/" .. k .. "/" .. k2 .. "/*.c"
+				})
+		end
 	end