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Backends: support for multiple imgui context with little testing (#586, #1851, #2004, #3012, #3934, #4141)

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I believe more renderer backends should work. GLFW/Win32/SDL/Vulkan probably have many issues.
This commit is contained in:
ocornut
2021-06-29 16:42:13 +02:00
parent b5a2bd1a5b
commit 4cec3a0467
11 changed files with 63 additions and 53 deletions
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14
backends/imgui_impl_sdl.cpp
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@ -69,14 +69,16 @@ struct ImGui_ImplSDL2_Data
char* ClipboardTextData;
bool MouseCanUseGlobalState;
ImGui_ImplSDL2_Data() { memset(this, 0, sizeof(*this)); }
ImGui_ImplSDL2_Data() { memset(this, 0, sizeof(*this)); }
};
// Wrapping access to backend data data (to facilitate multiple-contexts stored in io.BackendPlatformUserData)
static ImGui_ImplSDL2_Data* g_Data;
static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_CreateBackendData() { IM_ASSERT(g_Data == NULL); g_Data = IM_NEW(ImGui_ImplSDL2_Data); return g_Data; }
static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_GetBackendData() { return ImGui::GetCurrentContext() != NULL ? g_Data : NULL; }
static void ImGui_ImplSDL2_DestroyBackendData() { IM_DELETE(g_Data); g_Data = NULL; }
// Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts
// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
// FIXME: multi-context support is not well tested and probably dysfunctional in this backend.
// FIXME: some shared resources (mouse cursor shape, gamepad) are mishandled when using multi-context.
static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_CreateBackendData() { return IM_NEW(ImGui_ImplSDL2_Data)(); }
static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_GetBackendData() { return (ImGui_ImplSDL2_Data*)ImGui::GetIO().BackendPlatformUserData; }
static void ImGui_ImplSDL2_DestroyBackendData() { IM_DELETE(ImGui_ImplSDL2_GetBackendData()); }
// Functions
static const char* ImGui_ImplSDL2_GetClipboardText(void*)