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https://github.com/Drezil/imgui.git
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Backends: moved global to a data structure to facilitate support for multi-contexts. (#586, #1851, #2004, #3012, #3934, #4141)
This is NOT enable multi-contexts for any backends - in order to make this commit as harmless as possible, while containing all the cruft/renaming -
This commit is contained in:
ocornut
@ -18,6 +18,7 @@
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
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// 2021-03-22: Rework global mouse pos availability check listing supported platforms explicitly, effectively fixing mouse access on Raspberry Pi. (#2837, #3950)
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// 2020-05-25: Misc: Report a zero display-size when window is minimized, to be consistent with other backends.
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// 2020-02-20: Inputs: Fixed mapping for ImGuiKey_KeyPadEnter (using SDL_SCANCODE_KP_ENTER instead of SDL_SCANCODE_RETURN2).
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@ -59,20 +60,32 @@
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#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE SDL_VERSION_ATLEAST(2,0,4)
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#define SDL_HAS_VULKAN SDL_VERSION_ATLEAST(2,0,6)
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// Data
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static SDL_Window* g_Window = NULL;
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static Uint64 g_Time = 0;
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static bool g_MousePressed[3] = { false, false, false };
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static SDL_Cursor* g_MouseCursors[ImGuiMouseCursor_COUNT] = {};
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static char* g_ClipboardTextData = NULL;
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static bool g_MouseCanUseGlobalState = true;
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struct ImGui_ImplSDL2_Data
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{
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SDL_Window* Window;
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Uint64 Time;
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bool MousePressed[3];
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SDL_Cursor* MouseCursors[ImGuiMouseCursor_COUNT];
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char* ClipboardTextData;
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bool MouseCanUseGlobalState;
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ImGui_ImplSDL2_Data() { memset(this, 0, sizeof(*this)); }
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};
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// Wrapping access to backend data data (to facilitate multiple-contexts stored in io.BackendPlatformUserData)
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static ImGui_ImplSDL2_Data* g_Data;
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static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_CreateBackendData() { IM_ASSERT(g_Data == NULL); g_Data = IM_NEW(ImGui_ImplSDL2_Data); return g_Data; }
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static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_GetBackendData() { return ImGui::GetCurrentContext() != NULL ? g_Data : NULL; }
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static void ImGui_ImplSDL2_DestroyBackendData() { IM_DELETE(g_Data); g_Data = NULL; }
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// Functions
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static const char* ImGui_ImplSDL2_GetClipboardText(void*)
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{
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if (g_ClipboardTextData)
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SDL_free(g_ClipboardTextData);
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g_ClipboardTextData = SDL_GetClipboardText();
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return g_ClipboardTextData;
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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if (bd->ClipboardTextData)
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SDL_free(bd->ClipboardTextData);
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bd->ClipboardTextData = SDL_GetClipboardText();
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return bd->ClipboardTextData;
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}
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static void ImGui_ImplSDL2_SetClipboardText(void*, const char* text)
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@ -88,6 +101,8 @@ static void ImGui_ImplSDL2_SetClipboardText(void*, const char* text)
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bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
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{
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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switch (event->type)
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{
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case SDL_MOUSEWHEEL:
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@ -100,9 +115,9 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
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}
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case SDL_MOUSEBUTTONDOWN:
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{
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if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true;
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if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true;
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if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true;
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if (event->button.button == SDL_BUTTON_LEFT) { bd->MousePressed[0] = true; }
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if (event->button.button == SDL_BUTTON_RIGHT) { bd->MousePressed[1] = true; }
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if (event->button.button == SDL_BUTTON_MIDDLE) { bd->MousePressed[2] = true; }
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return true;
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}
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case SDL_TEXTINPUT:
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@ -132,13 +147,17 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
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static bool ImGui_ImplSDL2_Init(SDL_Window* window)
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{
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g_Window = window;
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ImGuiIO& io = ImGui::GetIO();
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IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_CreateBackendData();
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bd->Window = window;
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// Setup backend capabilities flags
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ImGuiIO& io = ImGui::GetIO();
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io.BackendPlatformUserData = (void*)bd;
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io.BackendPlatformName = "imgui_impl_sdl";
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io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
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io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used)
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io.BackendPlatformName = "imgui_impl_sdl";
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// Keyboard mapping. Dear ImGui will use those indices to peek into the io.KeysDown[] array.
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io.KeyMap[ImGuiKey_Tab] = SDL_SCANCODE_TAB;
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@ -169,24 +188,24 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window)
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io.ClipboardUserData = NULL;
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// Load mouse cursors
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g_MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
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g_MouseCursors[ImGuiMouseCursor_TextInput] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_IBEAM);
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g_MouseCursors[ImGuiMouseCursor_ResizeAll] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL);
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g_MouseCursors[ImGuiMouseCursor_ResizeNS] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENS);
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g_MouseCursors[ImGuiMouseCursor_ResizeEW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEWE);
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g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENESW);
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g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE);
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g_MouseCursors[ImGuiMouseCursor_Hand] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
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g_MouseCursors[ImGuiMouseCursor_NotAllowed] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NO);
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bd->MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
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bd->MouseCursors[ImGuiMouseCursor_TextInput] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_IBEAM);
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bd->MouseCursors[ImGuiMouseCursor_ResizeAll] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL);
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bd->MouseCursors[ImGuiMouseCursor_ResizeNS] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENS);
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bd->MouseCursors[ImGuiMouseCursor_ResizeEW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEWE);
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bd->MouseCursors[ImGuiMouseCursor_ResizeNESW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENESW);
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bd->MouseCursors[ImGuiMouseCursor_ResizeNWSE] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE);
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bd->MouseCursors[ImGuiMouseCursor_Hand] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
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bd->MouseCursors[ImGuiMouseCursor_NotAllowed] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NO);
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// Check and store if we are on a SDL backend that supports global mouse position
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// ("wayland" and "rpi" don't support it, but we chose to use a white-list instead of a black-list)
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const char* sdl_backend = SDL_GetCurrentVideoDriver();
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const char* global_mouse_whitelist[] = { "windows", "cocoa", "x11", "DIVE", "VMAN" };
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g_MouseCanUseGlobalState = false;
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bd->MouseCanUseGlobalState = false;
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for (int n = 0; n < IM_ARRAYSIZE(global_mouse_whitelist); n++)
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if (strncmp(sdl_backend, global_mouse_whitelist[n], strlen(global_mouse_whitelist[n])) == 0)
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g_MouseCanUseGlobalState = true;
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bd->MouseCanUseGlobalState = true;
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#ifdef _WIN32
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SDL_SysWMinfo wmInfo;
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@ -202,7 +221,7 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window)
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bool ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context)
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{
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(void)sdl_gl_context; // Viewport branch will need this.
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IM_UNUSED(sdl_gl_context); // Viewport branch will need this.
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return ImGui_ImplSDL2_Init(window);
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}
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@ -229,41 +248,48 @@ bool ImGui_ImplSDL2_InitForMetal(SDL_Window* window)
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void ImGui_ImplSDL2_Shutdown()
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{
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g_Window = NULL;
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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bd->Window = NULL;
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// Destroy last known clipboard data
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if (g_ClipboardTextData)
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SDL_free(g_ClipboardTextData);
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g_ClipboardTextData = NULL;
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if (bd->ClipboardTextData)
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SDL_free(bd->ClipboardTextData);
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bd->ClipboardTextData = NULL;
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// Destroy SDL mouse cursors
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for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
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SDL_FreeCursor(g_MouseCursors[cursor_n]);
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memset(g_MouseCursors, 0, sizeof(g_MouseCursors));
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SDL_FreeCursor(bd->MouseCursors[cursor_n]);
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memset(bd->MouseCursors, 0, sizeof(bd->MouseCursors));
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io.BackendPlatformName = NULL;
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io.BackendPlatformUserData = NULL;
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ImGui_ImplSDL2_DestroyBackendData();
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}
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static void ImGui_ImplSDL2_UpdateMousePosAndButtons()
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{
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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// Set OS mouse position if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
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if (io.WantSetMousePos)
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SDL_WarpMouseInWindow(g_Window, (int)io.MousePos.x, (int)io.MousePos.y);
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SDL_WarpMouseInWindow(bd->Window, (int)io.MousePos.x, (int)io.MousePos.y);
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else
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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int mx, my;
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Uint32 mouse_buttons = SDL_GetMouseState(&mx, &my);
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io.MouseDown[0] = g_MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
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io.MouseDown[1] = g_MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
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io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
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g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
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io.MouseDown[0] = bd->MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
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io.MouseDown[1] = bd->MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
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io.MouseDown[2] = bd->MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
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bd->MousePressed[0] = bd->MousePressed[1] = bd->MousePressed[2] = false;
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#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS)
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SDL_Window* focused_window = SDL_GetKeyboardFocus();
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if (g_Window == focused_window)
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if (bd->Window == focused_window)
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{
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if (g_MouseCanUseGlobalState)
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if (bd->MouseCanUseGlobalState)
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{
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// SDL_GetMouseState() gives mouse position seemingly based on the last window entered/focused(?)
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// The creation of a new windows at runtime and SDL_CaptureMouse both seems to severely mess up with that, so we retrieve that position globally.
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@ -282,7 +308,7 @@ static void ImGui_ImplSDL2_UpdateMousePosAndButtons()
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bool any_mouse_button_down = ImGui::IsAnyMouseDown();
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SDL_CaptureMouse(any_mouse_button_down ? SDL_TRUE : SDL_FALSE);
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#else
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if (SDL_GetWindowFlags(g_Window) & SDL_WINDOW_INPUT_FOCUS)
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if (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_INPUT_FOCUS)
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io.MousePos = ImVec2((float)mx, (float)my);
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#endif
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}
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@ -292,6 +318,7 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
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ImGuiIO& io = ImGui::GetIO();
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if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
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return;
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
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if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None)
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@ -302,7 +329,7 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
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else
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{
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// Show OS mouse cursor
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SDL_SetCursor(g_MouseCursors[imgui_cursor] ? g_MouseCursors[imgui_cursor] : g_MouseCursors[ImGuiMouseCursor_Arrow]);
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SDL_SetCursor(bd->MouseCursors[imgui_cursor] ? bd->MouseCursors[imgui_cursor] : bd->MouseCursors[ImGuiMouseCursor_Arrow]);
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SDL_ShowCursor(SDL_TRUE);
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}
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}
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@ -351,6 +378,8 @@ static void ImGui_ImplSDL2_UpdateGamepads()
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void ImGui_ImplSDL2_NewFrame(SDL_Window* window)
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{
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData();
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IM_ASSERT(bd->Window == window); // FIXME: Should remove parameter from ImGui_ImplSDL2_NewFrame()
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// Setup display size (every frame to accommodate for window resizing)
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int w, h;
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@ -366,8 +395,8 @@ void ImGui_ImplSDL2_NewFrame(SDL_Window* window)
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// Setup time step (we don't use SDL_GetTicks() because it is using millisecond resolution)
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static Uint64 frequency = SDL_GetPerformanceFrequency();
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Uint64 current_time = SDL_GetPerformanceCounter();
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io.DeltaTime = g_Time > 0 ? (float)((double)(current_time - g_Time) / frequency) : (float)(1.0f / 60.0f);
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g_Time = current_time;
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io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / frequency) : (float)(1.0f / 60.0f);
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bd->Time = current_time;
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ImGui_ImplSDL2_UpdateMousePosAndButtons();
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ImGui_ImplSDL2_UpdateMouseCursor();
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