Added ImGui_ImplPlatform_SetUpdateMonitors() for edge case where DPI …

…is 0.

ImGui/imgui_impl_platform.cpp

@@ -9,6 +9,8 @@
 #include "Platform/CrossPlatform/Macros.h"
 #include "Platform/CrossPlatform/GraphicsDeviceInterface.h"
 
+#include "Platform/External/glfw/include/GLFW/glfw3.h"
+
 using namespace platform;
 using namespace crossplatform;
 
@@ -35,6 +37,43 @@ TextureHash MakeTextureHash(TextureCreate *tc)
 	return hash;
 }
 
+// GLFW data
+enum GlfwClientApi
+{
+	GlfwClientApi_Unknown,
+	GlfwClientApi_OpenGL,
+	GlfwClientApi_Vulkan
+};
+
+struct ImGui_ImplGlfw_Data
+{
+	GLFWwindow *Window;
+	GlfwClientApi ClientApi;
+	double Time;
+	GLFWwindow *MouseWindow;
+	GLFWcursor *MouseCursors[ImGuiMouseCursor_COUNT];
+	ImVec2 LastValidMousePos;
+	GLFWwindow *KeyOwnerWindows[GLFW_KEY_LAST];
+	bool InstalledCallbacks;
+	bool CallbacksChainForAllWindows;
+	bool WantUpdateMonitors;
+#ifdef _WIN32
+	WNDPROC GlfwWndProc;
+#endif
+
+	// Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.
+	GLFWwindowfocusfun PrevUserCallbackWindowFocus;
+	GLFWcursorposfun PrevUserCallbackCursorPos;
+	GLFWcursorenterfun PrevUserCallbackCursorEnter;
+	GLFWmousebuttonfun PrevUserCallbackMousebutton;
+	GLFWscrollfun PrevUserCallbackScroll;
+	GLFWkeyfun PrevUserCallbackKey;
+	GLFWcharfun PrevUserCallbackChar;
+	GLFWmonitorfun PrevUserCallbackMonitor;
+
+	ImGui_ImplGlfw_Data() { memset((void *)this, 0, sizeof(*this)); }
+};
+
 // Platform data
 struct ImGui_ImplPlatform_Data
 {
@@ -465,6 +504,13 @@ void ImGui_ImplPlatform_RenderDrawData(GraphicsDeviceContext &deviceContext,ImDr
 	renderPlatform->EndEvent(deviceContext);
 }
 
+void ImGui_ImplPlatform_SetUpdateMonitors() 
+{
+	ImGui_ImplGlfw_Data *bd = ImGui::GetCurrentContext() ? (ImGui_ImplGlfw_Data *)ImGui::GetIO().BackendPlatformUserData : nullptr;
+	if (bd)
+		bd->WantUpdateMonitors = true;
+}
+
 static void ImGui_ImplPlatform_CreateFontsTexture()
 {
 	// Build texture atlas

ImGui/imgui_impl_platform.h

@@ -43,15 +43,17 @@ struct ImGui_ImplPlatform_TextureView
 
 //! Initialize the Platform implementation. If hosted is set to true, this will also fill in ImGuiPlatformIO, e.g. if imgui is hosted
 //! in a game engine etc instead of needing Win32 behaviour etc.
-IMGUI_IMPL_API bool     ImGui_ImplPlatform_Init(platform::crossplatform::RenderPlatform* r,bool hosted=false);
-IMGUI_IMPL_API void     ImGui_ImplPlatform_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplPlatform_NewFrame(bool in3d=false, int ui_pixel_width=400, int ui_pixel_height=300,const float *menupos=nullptr, float az=0.0f, float tilt=0.0f,float width_m=2.0f);
+IMGUI_IMPL_API bool		ImGui_ImplPlatform_Init(platform::crossplatform::RenderPlatform* r,bool hosted=false);
+IMGUI_IMPL_API void		ImGui_ImplPlatform_Shutdown();
+IMGUI_IMPL_API void		ImGui_ImplPlatform_NewFrame(bool in3d=false, int ui_pixel_width=400, int ui_pixel_height=300,const float *menupos=nullptr, float az=0.0f, float tilt=0.0f,float width_m=2.0f);
 IMGUI_IMPL_API void		ImGui_ImplPlatform_Win32_NewFrame();
-IMGUI_IMPL_API void     ImGui_ImplPlatform_RenderDrawData(platform::crossplatform::GraphicsDeviceContext& deviceContext, ImDrawData* draw_data);
+IMGUI_IMPL_API void		ImGui_ImplPlatform_RenderDrawData(platform::crossplatform::GraphicsDeviceContext& deviceContext, ImDrawData* draw_data);
+
+IMGUI_IMPL_API void		ImGui_ImplPlatform_SetUpdateMonitors();
 
 // Use if you want to reset your rendering device without losing Dear ImGui state.
-IMGUI_IMPL_API void     ImGui_ImplPlatform_InvalidateDeviceObjects();
-IMGUI_IMPL_API bool     ImGui_ImplPlatform_CreateDeviceObjects();
+IMGUI_IMPL_API void		ImGui_ImplPlatform_InvalidateDeviceObjects();
+IMGUI_IMPL_API bool		ImGui_ImplPlatform_CreateDeviceObjects();
 
 IMGUI_IMPL_API void		ImGui_ImplPlatform_RecompileShaders();
 IMGUI_IMPL_API void		ImGui_ImplPlatform_LoadShaders();