ghostty-org--ghostty/pkg/dcimgui/ext.cpp

#include "imgui.h"

// This file contains custom extensions for functionality that isn't
// properly supported by Dear Bindings yet. Namely:
// https://github.com/dearimgui/dear_bindings/issues/55

// Wrap this in a namespace to keep it separate from the C++ API
namespace cimgui
{
#include "dcimgui.h"
}

extern "C"
{
CIMGUI_API void ImFontConfig_ImFontConfig(cimgui::ImFontConfig* self)
{
    static_assert(sizeof(cimgui::ImFontConfig) == sizeof(::ImFontConfig), "ImFontConfig size mismatch");
    static_assert(alignof(cimgui::ImFontConfig) == alignof(::ImFontConfig), "ImFontConfig alignment mismatch");
    ::ImFontConfig defaults;
    *reinterpret_cast<::ImFontConfig*>(self) = defaults;
}

CIMGUI_API void ImGuiStyle_ImGuiStyle(cimgui::ImGuiStyle* self)
{
    static_assert(sizeof(cimgui::ImGuiStyle) == sizeof(::ImGuiStyle), "ImGuiStyle size mismatch");
    static_assert(alignof(cimgui::ImGuiStyle) == alignof(::ImGuiStyle), "ImGuiStyle alignment mismatch");
    ::ImGuiStyle defaults;
    *reinterpret_cast<::ImGuiStyle*>(self) = defaults;
}

// Perform the OpenGL3 backend shutdown and then zero out the imgl3w
// function pointer table. ImGui_ImplOpenGL3_Shutdown() calls
// imgl3wShutdown() which dlcloses the GL library handles but does not
// zero out the function pointers. A subsequent ImGui_ImplOpenGL3_Init()
// sees the stale (non-null) pointers, skips loader re-initialization,
// and crashes when calling through them. Zeroing the table forces the
// next Init to reload the GL function pointers via imgl3wInit().
#ifndef IMGUI_DISABLE
#if __has_include("backends/imgui_impl_opengl3.h")
#ifdef ZIGPKG_IMGUI_ENABLE_OPENGL3
#include "backends/imgui_impl_opengl3.h"
#include "backends/imgui_impl_opengl3_loader.h"

CIMGUI_API void ImGui_ImplOpenGL3_ShutdownWithLoaderCleanup()
{
    ::ImGui_ImplOpenGL3_Shutdown();
    memset(&imgl3wProcs, 0, sizeof(imgl3wProcs));
}
#endif // ZIGPKG_IMGUI_ENABLE_OPENGL3
#endif // __has_include("backends/imgui_impl_opengl3.h")
#endif // IMGUI_DISABLE

}