Add SDL backend for editor (#51)

* Added sdl backend code and controls window

src/editor/JulGameEditor/Editor.jl

@@ -17,12 +17,12 @@ module Editor
     using JulGame.TextBoxModule
     using JulGame.MainLoop
 
-    include("../../Macros.jl")
-    include("./MainMenuBar.jl")
-    include("./EntityContextMenu.jl")
-    include("./ComponentInputs.jl")
-    include("./TextBoxFields.jl")
-    include("./Utils.jl")
+    include(joinpath("..","..","Macros.jl"))
+    include("MainMenuBar.jl")
+    include("EntityContextMenu.jl")
+    include("ComponentInputs.jl")
+    include("TextBoxFields.jl")
+    include("Utils.jl")
 
     function scriptObj(name::String, parameters::Array)
         () -> (name; parameters)

src/editor/JulGameEditor/EditorSDLBackend.jl

@@ -0,0 +1,152 @@
+# Reference: https://github.com/ocornut/imgui/tree/master/examples/example_sdl2_sdlrenderer2
+
+module Editor
+    using CImGui
+    using CImGui.CSyntax
+    using CImGui.CSyntax.CStatic
+    using CImGui: ImVec2, ImVec4, IM_COL32, ImS32, ImU32, ImS64, ImU64, LibCImGui
+    using CImGui.LibCImGui
+    using SimpleDirectMediaLayer
+    const SDL2 = SimpleDirectMediaLayer
+    global sdlVersion = "2.0.0"
+    global sdlRenderer = C_NULL
+    global const BackendPlatformUserData = Ref{Any}(C_NULL)
+
+    include(joinpath("ImGuiSDLBackend", "imgui_impl_sdl2.jl"))
+    include(joinpath("ImGuiSDLBackend", "imgui_impl_sdlrenderer2.jl"))
+    include(joinpath("..","..","Macros.jl"))
+    include("MainMenuBar.jl")
+    include("EntityContextMenu.jl")
+    include("ComponentInputs.jl")
+    include("TextBoxFields.jl")
+    include("Utils.jl")
+
+    # Windows
+    include(joinpath("Windows", "GameControls.jl"))
+
+    function run()
+        info = initSDLAndImGui()
+        window, renderer, ctx, io, clear_color = info[1], info[2], info[3], info[4], info[5]
+
+        styleImGui()
+        showDemoWindow = true
+
+        quit = false
+            try
+                while !quit
+                    event_ref = Ref{SDL2.SDL_Event}()
+                    while Bool(SDL2.SDL_PollEvent(event_ref))
+                        evt = event_ref[]
+                        ImGui_ImplSDL2_ProcessEvent(evt)
+                        evt_ty = evt.type
+                        if evt_ty == SDL2.SDL_QUIT
+                            quit = true
+                            break
+                        end
+                    end
+
+                   startFrame()
+                   LibCImGui.igDockSpaceOverViewport(C_NULL, ImGuiDockNodeFlags_PassthruCentralNode, C_NULL) # Creating the "dockspace" that covers the whole window. This allows the child windows to automatically resize.
+
+
+                    ################################## RENDER HERE
+
+                    ################################# MAIN MENU BAR
+                    event = @event begin
+                       serializeEntities(entities, textBoxes, projectPath, "$(sceneName)")
+                    end
+                    events = [event]
+                    @c ShowMainMenuBar(Ref{Bool}(true), events)
+                    ################################# END MAIN MENU BAR
+
+                    @c CImGui.ShowDemoWindow(Ref{Bool}(showDemoWindow))
+
+
+
+                    ShowGameControls()
+
+
+                    ################################# STOP RENDERING HERE
+                    render(renderer, io, clear_color)
+                end
+            catch e
+                @warn "Error in renderloop!" exception=e
+                Base.show_backtrace(stderr, catch_backtrace())
+            finally
+                ImGui_ImplSDLRenderer2_Shutdown();
+                ImGui_ImplSDL2_Shutdown();
+
+                CImGui.DestroyContext(ctx)
+                SDL_DestroyRenderer(renderer);
+                SDL2.SDL_DestroyWindow(window);
+                SDL2.SDL_Quit()
+        end
+        # ================ CUT OFF
+        SDL2.SDL_Quit()
+        # ================ CUT OFF
+    end
+
+    function initSDLAndImGui()
+        if SDL2.SDL_Init(SDL2.SDL_INIT_VIDEO | SDL2.SDL_INIT_TIMER | SDL2.SDL_INIT_GAMECONTROLLER) < 0
+            println("failed to init: ", unsafe_string(SDL2.SDL_GetError()));
+        end
+        SDL2.SDL_SetHint(SDL2.SDL_HINT_IME_SHOW_UI, "1")
+
+        window = SDL2.SDL_CreateWindow(
+        "JulGame Editor v0.1.0", SDL2.SDL_WINDOWPOS_CENTERED, SDL2.SDL_WINDOWPOS_CENTERED, 1024, 768,
+        SDL2.SDL_WINDOW_SHOWN | SDL2.SDL_WINDOW_OPENGL | SDL2.SDL_WINDOW_RESIZABLE | SDL2.SDL_WINDOW_ALLOW_HIGHDPI
+        )
+        if window == C_NULL 
+            println("Failed to create window: ", unsafe_string(SDL2.SDL_GetError()))
+            return -1
+        end
+
+        renderer = SDL2.SDL_CreateRenderer(window, -1, SDL2.SDL_RENDERER_ACCELERATED)
+        global sdlRenderer = renderer
+        if (renderer == C_NULL)
+            println("Failed to create renderer: ", unsafe_string(SDL2.SDL_GetError()))
+        end
+
+        ver = pointer(SDL2.SDL_version[SDL2.SDL_version(0,0,0)])
+        SDL2.SDL_GetVersion(ver)
+        global sdlVersion = string(unsafe_load(ver).major, ".", unsafe_load(ver).minor, ".", unsafe_load(ver).patch)
+        println("SDL version: ", sdlVersion)
+        sdlVersion = parse(Int32, replace(sdlVersion, "." => ""))
+
+        ctx = CImGui.CreateContext()
+
+        io = CImGui.GetIO()
+        io.ConfigFlags = unsafe_load(io.ConfigFlags) | CImGui.ImGuiConfigFlags_DockingEnable | CImGui.ImGuiConfigFlags_NavEnableKeyboard | CImGui.ImGuiConfigFlags_NavEnableGamepad
+
+        io.BackendPlatformUserData = C_NULL
+        ImGui_ImplSDL2_InitForSDLRenderer(window, renderer)
+        ImGui_ImplSDLRenderer2_Init(renderer)
+        clear_color = Cfloat[0.45, 0.55, 0.60, 0.01]
+
+        return [window, renderer, ctx, io, clear_color]
+    end
+
+    function styleImGui() 
+        # setup Dear ImGui style #Todo: Make this a setting
+        CImGui.StyleColorsDark()
+        # CImGui.StyleColorsClassic()
+        # CImGui.StyleColorsLight()
+    end
+
+    function startFrame()
+        ImGui_ImplSDLRenderer2_NewFrame()
+        ImGui_ImplSDL2_NewFrame();
+        CImGui.NewFrame()
+    end
+
+    function render(renderer, io, clear_color)
+        CImGui.Render()
+        SDL2.SDL_RenderSetScale(renderer, unsafe_load(io.DisplayFramebufferScale.x), unsafe_load(io.DisplayFramebufferScale.y));
+        SDL2.SDL_SetRenderDrawColor(renderer, (UInt8)(round(clear_color[1] * 255)), (UInt8)(round(clear_color[2] * 255)), (UInt8)(round(clear_color[3] * 255)), (UInt8)(round(clear_color[4] * 255)));
+        SDL2.SDL_RenderClear(renderer);
+        ImGui_ImplSDLRenderer2_RenderDrawData(CImGui.GetDrawData());
+        SDL2.SDL_RenderPresent(renderer);
+    end
+
+end
+Editor.run()