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Merge pull request #120 from mellinoe/docking_template_additions

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Add CimguiStorage and ImGuiPlatformIO redirect functions to the master branch.
This commit is contained in:
Victor Bombi
2020-02-21 17:28:43 +01:00
committed by GitHub
parent c5eea0b2db 39336d9843
commit 9bed5f29a9
2 changed files with 60 additions and 0 deletions
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1
README.md
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@@ -35,6 +35,7 @@ Notes:
* edit config_generator.lua for adding includes needed by your chosen implementations.
* Run generator.bat or generator.sh with gcc, clang or cl and LuaJIT on your PATH.
* as a result some files are generated: `cimgui.cpp` and `cimgui.h` for compiling and some lua/json files with information about the binding: `definitions.json` with function info, `structs_and_enums.json` with struct and enum info, `impl_definitions.json` with functions from the implementations info.
* If you are generating bindings for the [docking](https://github.com/ocornut/imgui/tree/docking) branch of imgui, you must define the `IMGUI_DOCKING` constant in CMakeLists.txt. This includes extra custom definitions that are needed for some functionality on the docking branch.
# generate binding
* C interface is exposed by cimgui.h when you define CIMGUI_DEFINE_ENUMS_AND_STRUCTS

59
generator/cimgui_template.cpp
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@@ -59,3 +59,62 @@ CIMGUI_API void ImVector_ImWchar_UnInit(ImVector_ImWchar* p)
p->~ImVector<ImWchar>();
}
#ifdef IMGUI_DOCKING
// NOTE: Some function pointers in the ImGuiPlatformIO structure are not C-compatible because of their
// use of a complex return type. To work around this, we store a custom CimguiStorage object inside
// ImGuiIO::BackendLanguageUserData, which contains C-compatible function pointer variants for these
// functions. When a user function pointer is provided, we hook up the underlying ImGuiPlatformIO
// function pointer to a thunk which accesses the user function pointer through CimguiStorage.
struct CimguiStorage
{
void(*Platform_GetWindowPos)(ImGuiViewport* vp, ImVec2* out_pos);
void(*Platform_GetWindowSize)(ImGuiViewport* vp, ImVec2* out_pos);
};
// Gets a reference to the CimguiStorage object stored in the current ImGui context's BackendLanguageUserData.
CimguiStorage& GetCimguiStorage()
{
ImGuiIO& io = ImGui::GetIO();
if (io.BackendLanguageUserData == NULL)
{
io.BackendLanguageUserData = new CimguiStorage();
}
return *(CimguiStorage*)io.BackendLanguageUserData;
}
// Thunk satisfying the signature of ImGuiPlatformIO::Platform_GetWindowPos.
ImVec2 Platform_GetWindowPos_hook(ImGuiViewport* vp)
{
ImVec2 pos;
GetCimguiStorage().Platform_GetWindowPos(vp, &pos);
return pos;
};
// Fully C-compatible function pointer setter for ImGuiPlatformIO::Platform_GetWindowPos.
CIMGUI_API void ImGuiPlatformIO_Set_Platform_GetWindowPos(ImGuiPlatformIO* platform_io, void(*user_callback)(ImGuiViewport* vp, ImVec2* out_pos))
{
CimguiStorage& storage = GetCimguiStorage();
storage.Platform_GetWindowPos = user_callback;
platform_io->Platform_GetWindowPos = &Platform_GetWindowPos_hook;
}
// Thunk satisfying the signature of ImGuiPlatformIO::Platform_GetWindowSize.
ImVec2 Platform_GetWindowSize_hook(ImGuiViewport* vp)
{
ImVec2 size;
GetCimguiStorage().Platform_GetWindowSize(vp, &size);
return size;
};
// Fully C-compatible function pointer setter for ImGuiPlatformIO::Platform_GetWindowSize.
CIMGUI_API void ImGuiPlatformIO_Set_Platform_GetWindowSize(ImGuiPlatformIO* platform_io, void(*user_callback)(ImGuiViewport* vp, ImVec2* out_size))
{
CimguiStorage& storage = GetCimguiStorage();
storage.Platform_GetWindowSize = user_callback;
platform_io->Platform_GetWindowSize = &Platform_GetWindowSize_hook;
}
#endif