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Backends: OpenGL3: Lazily reinitialize embedded GL loader for when calling backend from e.g. other DLL boundaries. (#8406)

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ocornut 2025-02-18 18:19:10 +01:00
parent c4a32a129d
commit 8f0411ff03
2 changed files with 25 additions and 7 deletions
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30
backends/imgui_impl_opengl3.cpp
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@ -22,6 +22,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2025-02-18: OpenGL: Lazily reinitialize embedded GL loader for when calling backend from e.g. other DLL boundaries. (#8406)
// 2024-10-07: OpenGL: Changed default texture sampler to Clamp instead of Repeat/Wrap.
// 2024-06-28: OpenGL: ImGui_ImplOpenGL3_NewFrame() recreates font texture if it has been destroyed by ImGui_ImplOpenGL3_DestroyFontsTexture(). (#7748)
// 2024-05-07: OpenGL: Update loader for Linux to support EGL/GLVND. (#7562)
@ -169,6 +170,7 @@
// - You can temporarily use an unstripped version. See https://github.com/dearimgui/gl3w_stripped/releases
// Changes to this backend using new APIs should be accompanied by a regenerated stripped loader version.
#define IMGL3W_IMPL
#define IMGUI_IMPL_OPENGL_LOADER_IMGL3W
#include "imgui_impl_opengl3_loader.h"
#endif
@ -276,6 +278,21 @@ struct ImGui_ImplOpenGL3_VtxAttribState
};
#endif
// Not static to allow third-party code to use that if they want to (but undocumented)
bool ImGui_ImplOpenGL3_InitLoader();
bool ImGui_ImplOpenGL3_InitLoader()
{
// Initialize our loader
#ifdef IMGUI_IMPL_OPENGL_LOADER_IMGL3W
if (glGetIntegerv == NULL && imgl3wInit() != 0)
{
fprintf(stderr, "Failed to initialize OpenGL loader!\n");
return false;
}
#endif
return true;
}
// Functions
bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
{
@ -283,14 +300,9 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
IMGUI_CHECKVERSION();
IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
// Initialize our loader
#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
if (imgl3wInit() != 0)
{
fprintf(stderr, "Failed to initialize OpenGL loader!\n");
// Initialize loader
if (!ImGui_ImplOpenGL3_InitLoader())
return false;
}
#endif
// Setup backend capabilities flags
ImGui_ImplOpenGL3_Data* bd = IM_NEW(ImGui_ImplOpenGL3_Data)();
@ -406,6 +418,8 @@ void ImGui_ImplOpenGL3_NewFrame()
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
IM_ASSERT(bd != nullptr && "Context or backend not initialized! Did you call ImGui_ImplOpenGL3_Init()?");
ImGui_ImplOpenGL3_InitLoader(); // Lazily init loader if not already done for e.g. DLL boundaries.
if (!bd->ShaderHandle)
ImGui_ImplOpenGL3_CreateDeviceObjects();
if (!bd->FontTexture)
@ -497,6 +511,8 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
if (fb_width <= 0 || fb_height <= 0)
return;
ImGui_ImplOpenGL3_InitLoader(); // Lazily init loader if not already done for e.g. DLL boundaries.
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
// Backup GL state

2
docs/CHANGELOG.txt
View File

@ -87,6 +87,8 @@ Other changes:
by showing the filter inside the combo contents. (#718)
- Backends: SDL2, SDL3: Using SDL_OpenURL() in platform_io.Platform_OpenInShellFn
handler. (#7660) [@achabense]
- Backends: OpenGL3: Lazily reinitialize embedded GL loader for when calling backend
from e.g. other DLL boundaries. (#8406)
- Backends: Metal: Fixed a crash on application resources. (#8367, #7419) [@anszom]
- Backends: Vulkan: Added ApiVersion field in ImGui_ImplVulkan_InitInfo.
Default to header version if unspecified. (#8326, #8365) [@mklefrancois]