Backends: OpenGL3: rename gl3w's loader symbols to allow LTO compilation with another copy of gl3w. (#6875, #6668, #4445)

backends/imgui_impl_opengl3.cpp

@@ -22,6 +22,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2023-10-05: OpenGL: Rename symbols in our internal loader so that LTO compilation with another copy of gl3w is possible. (#6875, #6668, #4445)
 //  2023-06-20: OpenGL: Fixed erroneous use glGetIntegerv(GL_CONTEXT_PROFILE_MASK) on contexts lower than 3.2. (#6539, #6333)
 //  2023-05-09: OpenGL: Support for glBindSampler() backup/restore on ES3. (#6375)
 //  2023-04-18: OpenGL: Restore front and back polygon mode separately when supported by context. (#6333)

backends/imgui_impl_opengl3_loader.h

@@ -467,7 +467,7 @@ GL3W_API int imgl3wIsSupported(int major, int minor);
 GL3W_API GL3WglProc imgl3wGetProcAddress(const char *proc);
 
 /* gl3w internal state */
-union GL3WProcs {
+union ImGL3WProcs {
     GL3WglProc ptr[59];
     struct {
         PFNGLACTIVETEXTUREPROC            ActiveTexture;
@@ -532,7 +532,7 @@ union GL3WProcs {
     } gl;
 };
 
-GL3W_API extern union GL3WProcs imgl3wProcs;
+GL3W_API extern union ImGL3WProcs imgl3wProcs;
 
 /* OpenGL functions */
 #define glActiveTexture                   imgl3wProcs.gl.ActiveTexture
@@ -794,7 +794,7 @@ static const char *proc_names[] = {
     "glViewport",
 };
 
-GL3W_API union GL3WProcs imgl3wProcs;
+GL3W_API union ImGL3WProcs imgl3wProcs;
 
 static void load_procs(GL3WGetProcAddressProc proc)
 {

docs/CHANGELOG.txt

@@ -128,6 +128,8 @@ Other changes:
   is compiled in MBCS mode and using a non-Unicode window. (#6785, #6782, #5725, #5961) [@sneakyevil]
 - Backends: Win32: Synthesize key-down event on key-up for VK_SNAPSHOT / ImGuiKey_PrintScreen as Windows
   doesn't emit it (same behavior as GLFW/SDL). (#6859) [@thedmd, @SuperWangKai]
+- Backends: OpenGL3: rename symbols in our internal loader so that LTO compilation with another
+  copy of gl3w becomes possible. (#6875, #6668, #4445) [@nicolasnoble]
 - Internals: Renamed ImFloor() to ImTrunc(). Renamed ImFloorSigned() to ImFloor(). (#6861)
 
 
@@ -1431,7 +1433,7 @@ Breaking Changes:
 - Commented out redirecting functions/enums names that were marked obsolete in 1.67 and 1.69 (March 2019):
   - ImGui::GetOverlayDrawList() -> use ImGui::GetForegroundDrawList()
   - ImFont::GlyphRangesBuilder  -> use ImFontGlyphRangesBuilder
-- Backends: OpenGL3: added a third source file "imgui_impl_opengl3_loader.h". [@rokups]
+- Backends: OpenGL3: added a third source file "imgui_impl_opengl3_loader.h". (#4445) [@rokups]
 - Backends: GLFW: backend now uses glfwSetCursorEnterCallback(). (#3751, #4377, #2445)
 - Backends: GLFW: backend now uses glfwSetWindowFocusCallback(). (#4388) [@thedmd]
   - If calling ImGui_ImplGlfw_InitXXX with install_callbacks=true: this is already done for you.
@@ -1520,7 +1522,7 @@ Other Changes:
   about building on 32-bit systems. (#4225) [@kingofthebongo2008]
 - Backends: OpenGL3: Embed our own minimal GL headers/loader (imgui_impl_opengl3_loader.h) based on gl3w.
   Reduces the frequent issues and confusion coming from having to support multiple loaders and requiring users to use and
-  initialize the same loader as the backend. [@rokups]
+  initialize the same loader as the backend. (#4445) [@rokups]
   Removed support for gl3w, glew, glad, glad2, glbinding2, glbinding3 (all now unnecessary).
 - Backends: OpenGL3: Handle GL_CLIP_ORIGIN on <4.5 contexts if "GL_ARB_clip_control" extension is detected. (#4170, #3998)
 - Backends: OpenGL3: Destroy vertex/fragment shader objects right after they are linked into main shader. (#4244) [@Crowbarous]