Refactor as much code out of 3DS backends as possible

source/3ds/imgui_citro3d.cpp

@@ -36,20 +36,6 @@ namespace
 /// \brief 3DS font glyph ranges
 std::vector<ImWchar> s_fontRanges;
 
-/// \brief Clear color
-constexpr auto CLEAR_COLOR = 0x204B7AFF;
-
-/// \brief Display transfer flags
-constexpr auto DISPLAY_TRANSFER_FLAGS =
-    GX_TRANSFER_FLIP_VERT (0) | GX_TRANSFER_OUT_TILED (0) | GX_TRANSFER_RAW_COPY (0) |
-    GX_TRANSFER_IN_FORMAT (GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT (GX_TRANSFER_FMT_RGB8) |
-    GX_TRANSFER_SCALING (GX_TRANSFER_SCALE_XY);
-
-/// \brief Top screen render target
-C3D_RenderTarget *s_top = nullptr;
-/// \brief Bottom screen render target
-C3D_RenderTarget *s_bottom = nullptr;
-
 /// \brief Vertex shader
 DVLB_s *s_vsh = nullptr;
 /// \brief Vertex shader program
@@ -166,22 +152,11 @@ void setupRenderState (gfxScreen_t const screen_)
 void imgui::citro3d::init ()
 {
 	// setup back-end capabilities flags
-	ImGuiIO &io = ImGui::GetIO ();
+	auto &io = ImGui::GetIO ();
 
 	io.BackendRendererName = "citro3d";
 	io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;
 
-	// initialize citro3d
-	C3D_Init (C3D_DEFAULT_CMDBUF_SIZE);
-
-	// create top screen render target
-	s_top = C3D_RenderTargetCreate (480, 800, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
-	C3D_RenderTargetSetOutput (s_top, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
-
-	// create bottom screen render target
-	s_bottom = C3D_RenderTargetCreate (480, 640, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
-	C3D_RenderTargetSetOutput (s_bottom, GFX_BOTTOM, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
-
 	// load vertex shader
 	s_vsh = DVLB_ParseFile (
 	    const_cast<std::uint32_t *> (reinterpret_cast<std::uint32_t const *> (vshader_shbin)),
@@ -194,10 +169,6 @@ void imgui::citro3d::init ()
 	// get projection matrix uniform location
 	s_projLocation = shaderInstanceGetUniformLocation (s_program.vertexShader, "proj");
 
-	// initialize projection matrices
-	Mtx_OrthoTilt (&s_projTop, 0.0f, 400.0f, 240.0f, 0.0f, -1.0f, 1.0f, false);
-	Mtx_OrthoTilt (&s_projBottom, 40.0f, 360.0f, 480.0f, 240.0f, -1.0f, 1.0f, false);
-
 	// allocate vertex data buffer
 	s_vtxSize = 65536;
 	s_vtxData = reinterpret_cast<ImDrawVert *> (linearAlloc (sizeof (ImDrawVert) * s_vtxSize));
@@ -421,43 +392,38 @@ void imgui::citro3d::exit ()
 	// free shader program
 	shaderProgramFree (&s_program);
 	DVLB_Free (s_vsh);
-
-	// free render targets
-	C3D_RenderTargetDelete (s_bottom);
-	C3D_RenderTargetDelete (s_top);
-
-	// deinitialize citro3d
-	C3D_Fini ();
 }
 
-void imgui::citro3d::newFrame ()
+void imgui::citro3d::render (C3D_RenderTarget *const top_, C3D_RenderTarget *const bottom_)
 {
-}
-
-void imgui::citro3d::render ()
-{
-	C3D_FrameBegin (C3D_FRAME_SYNCDRAW);
-
-	// clear frame/depth buffers
-	C3D_RenderTargetClear (s_top, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
-	C3D_RenderTargetClear (s_bottom, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
-
 	// get draw data
 	auto const drawData = ImGui::GetDrawData ();
 	if (drawData->CmdListsCount <= 0)
-	{
-		C3D_FrameEnd (0);
 		return;
-	}
 
 	// get framebuffer dimensions
 	unsigned width  = drawData->DisplaySize.x * drawData->FramebufferScale.x;
 	unsigned height = drawData->DisplaySize.y * drawData->FramebufferScale.y;
 	if (width <= 0 || height <= 0)
-	{
-		C3D_FrameEnd (0);
 		return;
-	}
+
+	// initialize projection matrices
+	Mtx_OrthoTilt (&s_projTop,
+	    0.0f,
+	    drawData->DisplaySize.x,
+	    drawData->DisplaySize.y * 0.5f,
+	    0.0f,
+	    -1.0f,
+	    1.0f,
+	    false);
+	Mtx_OrthoTilt (&s_projBottom,
+	    drawData->DisplaySize.x * 0.1f,
+	    drawData->DisplaySize.x * 0.9f,
+	    drawData->DisplaySize.y,
+	    drawData->DisplaySize.y * 0.5f,
+	    -1.0f,
+	    1.0f,
+	    false);
 
 	// check if we need to grow vertex data buffer
 	if (s_vtxSize < static_cast<std::size_t> (drawData->TotalVtxCount))
@@ -515,9 +481,9 @@ void imgui::citro3d::render ()
 	for (auto const &screen : {GFX_TOP, GFX_BOTTOM})
 	{
 		if (screen == GFX_TOP)
-			C3D_FrameDrawOn (s_top);
+			C3D_FrameDrawOn (top_);
 		else
-			C3D_FrameDrawOn (s_bottom);
+			C3D_FrameDrawOn (bottom_);
 
 		setupRenderState (screen);
 
@@ -725,6 +691,4 @@ void imgui::citro3d::render ()
 			offsetIdx += cmdList.IdxBuffer.Size;
 		}
 	}
-
-	C3D_FrameEnd (0);
 }

source/3ds/imgui_citro3d.h

@@ -20,6 +20,8 @@
 
 #pragma once
 
+#include <citro3d.h>
+
 namespace imgui
 {
 namespace citro3d
@@ -29,9 +31,7 @@ void init ();
 /// \brief Deinitialize citro3d
 void exit ();
 
-/// \brief Prepare citro3d for a new frame
-void newFrame ();
 /// \brief Render ImGui draw list
-void render ();
+void render (C3D_RenderTarget *top_, C3D_RenderTarget *bottom_);
 }
 }

source/3ds/imgui_ctru.cpp

@@ -36,11 +36,6 @@ using namespace std::chrono_literals;
 
 namespace
 {
-/// \brief Screen width
-constexpr auto SCREEN_WIDTH = 400.0f;
-/// \brief Screen height
-constexpr auto SCREEN_HEIGHT = 480.0f;
-
 /// \brief Clipboard
 std::string s_clipboard;
 
@@ -134,10 +129,7 @@ void updateGamepads (ImGuiIO &io_)
 
 bool imgui::ctru::init ()
 {
-	ImGuiIO &io = ImGui::GetIO ();
+	auto &io = ImGui::GetIO ();
-
-	// disable imgui.ini file
-	io.IniFilename = nullptr;
 
 	// setup config flags
 	io.ConfigFlags |= ImGuiConfigFlags_IsTouchScreen;
@@ -160,17 +152,13 @@ bool imgui::ctru::init ()
 
 void imgui::ctru::newFrame ()
 {
-	ImGuiIO &io = ImGui::GetIO ();
+	auto &io = ImGui::GetIO ();
 
 	// check that font was built
 	IM_ASSERT (io.Fonts->IsBuilt () &&
 	           "Font atlas not built! It is generally built by the renderer back-end. Missing call "
 	           "to renderer _NewFrame() function?");
 
-	// setup display metrics
-	io.DisplaySize             = ImVec2 (SCREEN_WIDTH, SCREEN_HEIGHT);
-	io.DisplayFramebufferScale = ImVec2 (2.0f, 2.0f);
-
 	// time step
 	static auto const start = platform::steady_clock::now ();
 	static auto prev        = start;
@@ -182,7 +170,3 @@ void imgui::ctru::newFrame ()
 	updateTouch (io);
 	updateGamepads (io);
 }
-
-void imgui::ctru::exit ()
-{
-}

source/3ds/imgui_ctru.h

@@ -26,8 +26,6 @@ namespace ctru
 {
 /// \brief Initialize 3ds platform
 bool init ();
-/// \brief Deinitialize 3ds platform
-void exit ();
 
 /// \brief Prepare 3ds for a new frame
 void newFrame ();

source/3ds/platform.cpp

@@ -55,6 +55,45 @@ bool s_socuActive = false;
 /// \brief soc:u buffer
 u32 *s_socuBuffer = nullptr;
 
+/// \brief Clear color
+constexpr auto CLEAR_COLOR = 0x204B7AFF;
+
+/// \brief Screen width
+constexpr auto SCREEN_WIDTH = 400.0f;
+/// \brief Screen height
+constexpr auto SCREEN_HEIGHT = 480.0f;
+
+/// \brief Whether to use anti-aliasing
+#define ANTI_ALIAS 1
+
+#if ANTI_ALIAS
+/// \brief Display transfer scaling
+constexpr auto TRANSFER_SCALING = GX_TRANSFER_SCALE_XY;
+/// \brief Framebuffer scale
+constexpr auto FB_SCALE = 2.0f;
+#else
+/// \brief Display transfer scaling
+constexpr auto TRANSFER_SCALING = GX_TRANSFER_SCALE_NO;
+/// \brief Framebuffer scale
+constexpr auto FB_SCALE = 1.0f;
+#endif
+
+/// \brief Framebuffer width
+constexpr auto FB_WIDTH = SCREEN_WIDTH * FB_SCALE;
+/// \brief Framebuffer height
+constexpr auto FB_HEIGHT = SCREEN_HEIGHT * FB_SCALE;
+
+/// \brief Display transfer flags
+constexpr auto DISPLAY_TRANSFER_FLAGS =
+    GX_TRANSFER_FLIP_VERT (0) | GX_TRANSFER_OUT_TILED (0) | GX_TRANSFER_RAW_COPY (0) |
+    GX_TRANSFER_IN_FORMAT (GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT (GX_TRANSFER_FMT_RGB8) |
+    GX_TRANSFER_SCALING (TRANSFER_SCALING);
+
+/// \brief Top screen render target
+C3D_RenderTarget *s_top = nullptr;
+/// \brief Bottom screen render target
+C3D_RenderTarget *s_bottom = nullptr;
+
 /// \brief Texture atlas
 C3D_Tex s_gfxTexture;
 /// \brief Texture atlas metadata
@@ -94,16 +133,16 @@ void drawLogo ()
 	auto subTex = Tex3DS_GetSubTexture (s_gfxT3x, gfx_c3dlogo_idx);
 
 	// get framebuffer metrics
-	ImGuiIO &io             = ImGui::GetIO ();
+	auto const &io          = ImGui::GetIO ();
 	auto const screenWidth  = io.DisplaySize.x;
 	auto const screenHeight = io.DisplaySize.y;
 	auto const logoWidth    = subTex->width;
 	auto const logoHeight   = subTex->height;
 
 	// calculate top screen coords
-	auto const x1 = (screenWidth - logoWidth) / 2.0f;
+	auto const x1 = (screenWidth - logoWidth) * 0.5f;
 	auto const x2 = x1 + logoWidth;
-	auto const y1 = (screenHeight / 2.0f - logoHeight) / 2.0f;
+	auto const y1 = (screenHeight * 0.5f - logoHeight) * 0.5f;
 	auto const y2 = y1 + logoHeight;
 
 	// calculate uv coords
@@ -116,8 +155,8 @@ void drawLogo ()
 
 	// draw to bottom screen
 	ImGui::GetBackgroundDrawList ()->AddImage (&s_gfxTexture,
-	    ImVec2 (x1, y1 + screenHeight / 2.0f),
+	    ImVec2 (x1, y1 + screenHeight * 0.5f),
-	    ImVec2 (x2, y2 + screenHeight / 2.0f),
+	    ImVec2 (x2, y2 + screenHeight * 0.5f),
 	    uv1,
 	    uv2);
 }
@@ -219,6 +258,19 @@ bool platform::init ()
 	std::setvbuf (stderr, nullptr, _IOLBF, 0);
 #endif
 
+	// initialize citro3d
+	C3D_Init (C3D_DEFAULT_CMDBUF_SIZE);
+
+	// create top screen render target
+	s_top =
+	    C3D_RenderTargetCreate (FB_HEIGHT * 0.5f, FB_WIDTH, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
+	C3D_RenderTargetSetOutput (s_top, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
+
+	// create bottom screen render target
+	s_bottom = C3D_RenderTargetCreate (
+	    FB_HEIGHT * 0.5f, FB_WIDTH * 0.8f, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
+	C3D_RenderTargetSetOutput (s_bottom, GFX_BOTTOM, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
+
 	if (!imgui::ctru::init ())
 		return false;
 
@@ -237,8 +289,13 @@ bool platform::init ()
 		C3D_TexSetFilter (&s_gfxTexture, GPU_LINEAR, GPU_LINEAR);
 	}
 
+	auto &io    = ImGui::GetIO ();
+	auto &style = ImGui::GetStyle ();
+
+	// disable imgui.ini file
+	io.IniFilename = nullptr;
+
 	// citro3d logo doesn't quite show with the default transparency
-	auto &style                       = ImGui::GetStyle ();
 	style.Colors[ImGuiCol_WindowBg].w = 0.8f;
 	style.ScaleAllSizes (0.5f);
 
@@ -257,8 +314,13 @@ bool platform::loop ()
 	if (hidKeysDown () & KEY_START)
 		return false;
 
+	auto &io = ImGui::GetIO ();
+
+	// setup display metrics
+	io.DisplaySize             = ImVec2 (SCREEN_WIDTH, SCREEN_HEIGHT);
+	io.DisplayFramebufferScale = ImVec2 (FB_SCALE, FB_SCALE);
+
 	imgui::ctru::newFrame ();
-	imgui::citro3d::newFrame ();
 	ImGui::NewFrame ();
 
 	return true;
@@ -271,16 +333,31 @@ void platform::render ()
 
 	ImGui::Render ();
 
-	imgui::citro3d::render ();
+	C3D_FrameBegin (C3D_FRAME_SYNCDRAW);
+
+	// clear frame/depth buffers
+	C3D_RenderTargetClear (s_top, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
+	C3D_RenderTargetClear (s_bottom, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
+
+	imgui::citro3d::render (s_top, s_bottom);
+
+	C3D_FrameEnd (0);
 }
 
 void platform::exit ()
 {
+	imgui::citro3d::exit ();
+
+	// free graphics
 	Tex3DS_TextureFree (s_gfxT3x);
 	C3D_TexDelete (&s_gfxTexture);
 
-	imgui::citro3d::exit ();
+	// free render targets
-	imgui::ctru::exit ();
+	C3D_RenderTargetDelete (s_bottom);
+	C3D_RenderTargetDelete (s_top);
+
+	// deinitialize citro3d
+	C3D_Fini ();
 
 	if (s_socuActive)
 		socExit ();

source/ftpServer.cpp

@@ -67,7 +67,7 @@ FtpServer::FtpServer (std::uint16_t const port_)
 
 void FtpServer::draw ()
 {
-	ImGuiIO &io       = ImGui::GetIO ();
+	auto const &io    = ImGui::GetIO ();
 	auto const width  = io.DisplaySize.x;
 	auto const height = io.DisplaySize.y;
 

source/linux/platform.cpp

@@ -154,8 +154,9 @@ bool platform::init ()
 	ImGui_ImplGlfw_InitForOpenGL (s_mainWindow.get (), true);
 	ImGui_ImplOpenGL3_Init ("#version 150");
 
+	auto &io = ImGui::GetIO ();
+
 	// disable imgui.ini file
-	ImGuiIO &io    = ImGui::GetIO ();
 	io.IniFilename = nullptr;
 
 	return true;

source/main.cpp

@@ -38,7 +38,9 @@ int main (int argc_, char *argv_[])
 		return EXIT_FAILURE;
 	}
 
-	auto &style          = ImGui::GetStyle ();
+	auto &style = ImGui::GetStyle ();
+
+	// turn off window rounding
 	style.WindowRounding = 0.0f;
 
 	auto server = FtpServer::create (5000);

source/switch/imgui_deko3d.cpp

@@ -368,9 +368,9 @@ DkCmdList setupRenderState (int const slot_,
 
 void imgui::deko3d::init ()
 {
-	// setup back-end capabilities flags
+	auto &io = ImGui::GetIO ();
-	ImGuiIO &io = ImGui::GetIO ();
 
+	// setup back-end capabilities flags
 	io.BackendRendererName = "deko3d";
 	io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;
 
@@ -457,7 +457,7 @@ void imgui::deko3d::newFrame ()
 	                      .create ();
 
 	// get texture atlas
-	ImGuiIO &io = ImGui::GetIO ();
+	auto &io = ImGui::GetIO ();
 	io.Fonts->SetTexID (nullptr);
 	unsigned char *pixels;
 	int width;

source/switch/imgui_nx.cpp

@@ -1589,7 +1589,7 @@ bool saveFontAtlas ()
 
 bool imgui::nx::init ()
 {
-	ImGuiIO &io = ImGui::GetIO ();
+	auto &io = ImGui::GetIO ();
 
 	if (!loadFontAtlas ())
 	{
@@ -1690,7 +1690,7 @@ bool imgui::nx::init ()
 
 void imgui::nx::newFrame ()
 {
-	ImGuiIO &io = ImGui::GetIO ();
+	auto &io = ImGui::GetIO ();
 
 	// check that font was built
 	IM_ASSERT (io.Fonts->IsBuilt () &&