Examples Refactor: GLFW: Explicit functions to init GLFW with OpenGL or Vulkan since we cannot read the api hints from glfw.

examples/imgui_impl_glfw.cpp

@@ -111,7 +111,7 @@ void ImGui_ImplGlfw_InstallCallbacks(GLFWwindow* window)
     glfwSetCharCallback(window, ImGui_ImplGlfw_CharCallback);
 }
 
-bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks)
+static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, GlfwClientApi client_api)
 {
     g_Window = window;
 
@@ -163,16 +163,18 @@ bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks)
     if (io.ConfigFlags & ImGuiConfigFlags_EnableViewports)
         ImGui_ImplGlfw_InitPlatformInterface();
 
-    g_ClientApi = GlfwClientApi_OpenGL;
+    g_ClientApi = client_api;
     return true;
 }
 
+bool ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks)
+{
+    return ImGui_ImplGlfw_Init(window, install_callbacks, GlfwClientApi_OpenGL);
+}
+
 bool ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks)
 {
-    if (!ImGui_ImplGlfw_Init(window, install_callbacks))
-        return false;
-    g_ClientApi = GlfwClientApi_Vulkan;
-    return true;
+    return ImGui_ImplGlfw_Init(window, install_callbacks, GlfwClientApi_Vulkan);
 }
 
 void ImGui_ImplGlfw_Shutdown()

examples/imgui_impl_glfw.h

@@ -12,7 +12,7 @@
 
 struct GLFWwindow;
 
-IMGUI_API bool        ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks);
+IMGUI_API bool        ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks);
 IMGUI_API bool        ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks);
 IMGUI_API void        ImGui_ImplGlfw_Shutdown();
 IMGUI_API void        ImGui_ImplGlfw_NewFrame();

examples/opengl2_example/main.cpp

@@ -31,7 +31,7 @@ int main(int, char**)
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
-    ImGui_ImplGlfw_Init(window, true);
+    ImGui_ImplGlfw_InitForOpenGL(window, true);
     ImGui_ImplOpenGL2_Init();
 
     // Setup style

examples/opengl3_example/main.cpp

@@ -40,7 +40,7 @@ int main(int, char**)
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
 
-    ImGui_ImplGlfw_Init(window, true);
+    ImGui_ImplGlfw_InitForOpenGL(window, true);
     ImGui_ImplOpenGL3_Init();
 
     // Setup style