Add a return parameter to ImGui_Impl...._NewFrame()

Why does CreateDeviceObjects return a bool if the NewFrame doesn't ?
Added the return parameter cause CreateDeviceObjects can fail.
It did fail on DX11 with feature level to 9.

ImGui/impls/imgui_impl_opengl3.cpp

@@ -63,7 +63,7 @@
 #define _CRT_SECURE_NO_WARNINGS
 #endif
 
-#include "imgui.h"
+#include "../imgui.h"
 #include "imgui_impl_opengl3.h"
 #include <stdio.h>
 #if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier
@@ -162,10 +162,12 @@ void    ImGui_ImplOpenGL3_Shutdown()
     ImGui_ImplOpenGL3_DestroyDeviceObjects();
 }
 
-void    ImGui_ImplOpenGL3_NewFrame()
+bool    ImGui_ImplOpenGL3_NewFrame()
 {
     if (!g_FontTexture)
-        ImGui_ImplOpenGL3_CreateDeviceObjects();
+        return ImGui_ImplOpenGL3_CreateDeviceObjects();
+
+    return true;
 }
 
 static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height, GLuint vertex_array_object)

ImGui/impls/imgui_impl_opengl3.h

@@ -37,7 +37,7 @@
 
 IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL);
 IMGUI_IMPL_API void     ImGui_ImplOpenGL3_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplOpenGL3_NewFrame();
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);
 
 // Called by Init/NewFrame/Shutdown

ImGui/impls/windows/imgui_impl_dx10.cpp

@@ -548,8 +548,10 @@ void ImGui_ImplDX10_Shutdown()
     if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
 }
 
-void ImGui_ImplDX10_NewFrame()
+bool ImGui_ImplDX10_NewFrame()
 {
     if (!g_pFontSampler)
-        ImGui_ImplDX10_CreateDeviceObjects();
+        return ImGui_ImplDX10_CreateDeviceObjects();
+
+    return true;
 }

ImGui/impls/windows/imgui_impl_dx10.h

@@ -15,7 +15,7 @@ struct ID3D10Device;
 
 IMGUI_IMPL_API bool     ImGui_ImplDX10_Init(ID3D10Device* device);
 IMGUI_IMPL_API void     ImGui_ImplDX10_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplDX10_NewFrame();
+IMGUI_IMPL_API bool     ImGui_ImplDX10_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.

ImGui/impls/windows/imgui_impl_dx11.cpp

@@ -556,8 +556,10 @@ void ImGui_ImplDX11_Shutdown()
     if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = NULL; }
 }
 
-void ImGui_ImplDX11_NewFrame()
+bool ImGui_ImplDX11_NewFrame()
 {
     if (!g_pFontSampler)
-        ImGui_ImplDX11_CreateDeviceObjects();
+        return ImGui_ImplDX11_CreateDeviceObjects();
+
+    return true;
 }

ImGui/impls/windows/imgui_impl_dx11.h

@@ -16,7 +16,7 @@ struct ID3D11DeviceContext;
 
 IMGUI_IMPL_API bool     ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_context);
 IMGUI_IMPL_API void     ImGui_ImplDX11_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplDX11_NewFrame();
+IMGUI_IMPL_API bool     ImGui_ImplDX11_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.

ImGui/impls/windows/imgui_impl_dx12.cpp

@@ -668,8 +668,10 @@ void ImGui_ImplDX12_Shutdown()
     g_frameIndex = UINT_MAX;
 }
 
-void ImGui_ImplDX12_NewFrame()
+bool ImGui_ImplDX12_NewFrame()
 {
     if (!g_pPipelineState)
-        ImGui_ImplDX12_CreateDeviceObjects();
+        return ImGui_ImplDX12_CreateDeviceObjects();
+
+    return true;
 }

ImGui/impls/windows/imgui_impl_dx12.h

@@ -26,7 +26,7 @@ struct D3D12_GPU_DESCRIPTOR_HANDLE;
 IMGUI_IMPL_API bool     ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FORMAT rtv_format,
                                             D3D12_CPU_DESCRIPTOR_HANDLE font_srv_cpu_desc_handle, D3D12_GPU_DESCRIPTOR_HANDLE font_srv_gpu_desc_handle);
 IMGUI_IMPL_API void     ImGui_ImplDX12_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplDX12_NewFrame();
+IMGUI_IMPL_API bool     ImGui_ImplDX12_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandList* graphics_command_list);
 
 // Use if you want to reset your rendering device without losing ImGui state.

ImGui/impls/windows/imgui_impl_dx9.cpp

@@ -277,8 +277,10 @@ void ImGui_ImplDX9_InvalidateDeviceObjects()
     if (g_FontTexture) { g_FontTexture->Release(); g_FontTexture = NULL; ImGui::GetIO().Fonts->TexID = NULL; } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
 }
 
-void ImGui_ImplDX9_NewFrame()
+bool ImGui_ImplDX9_NewFrame()
 {
     if (!g_FontTexture)
-        ImGui_ImplDX9_CreateDeviceObjects();
+        return ImGui_ImplDX9_CreateDeviceObjects();
+
+    return true;
 }

ImGui/impls/windows/imgui_impl_dx9.h

@@ -15,7 +15,7 @@ struct IDirect3DDevice9;
 
 IMGUI_IMPL_API bool     ImGui_ImplDX9_Init(IDirect3DDevice9* device);
 IMGUI_IMPL_API void     ImGui_ImplDX9_Shutdown();
-IMGUI_IMPL_API void     ImGui_ImplDX9_NewFrame();
+IMGUI_IMPL_API bool     ImGui_ImplDX9_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.