Obsoleted the io.RenderDrawListsFn callback, you can call your graphics engine render function after ImGui::Render(). Use ImGui::GetDrawData() to retrieve the ImDrawData* to display..(#1599)

Examples: Updated examples.

examples/allegro5_example/imgui_impl_a5.cpp

@@ -10,6 +10,12 @@
 // If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
 // https://github.com/ocornut/imgui, Original code by @birthggd
 
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplA5_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+//  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
+
 #include <stdint.h>     // uint64_t
 #include <cstring>      // memcpy
 #include "imgui.h"
@@ -35,7 +41,9 @@ struct ImDrawVertAllegro
     ALLEGRO_COLOR col;
 };
 
-void ImGui_ImplA5_RenderDrawLists(ImDrawData* draw_data)
+// Render function.
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
+void ImGui_ImplA5_RenderDrawData(ImDrawData* draw_data)
 {
     int op, src, dst;
     al_get_blender(&op, &src, &dst);
@@ -190,7 +198,6 @@ bool ImGui_ImplA5_Init(ALLEGRO_DISPLAY* display)
     io.KeyMap[ImGuiKey_Y] = ALLEGRO_KEY_Y;
     io.KeyMap[ImGuiKey_Z] = ALLEGRO_KEY_Z;
 
-    io.RenderDrawListsFn = ImGui_ImplA5_RenderDrawLists;        // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
 #ifdef _WIN32
     io.ImeWindowHandle = al_get_win_window_handle(g_Display);
 #endif

examples/allegro5_example/imgui_impl_a5.h

@@ -18,6 +18,7 @@ union ALLEGRO_EVENT;
 IMGUI_API bool    ImGui_ImplA5_Init(ALLEGRO_DISPLAY* display);
 IMGUI_API void    ImGui_ImplA5_Shutdown();
 IMGUI_API void    ImGui_ImplA5_NewFrame();
+IMGUI_API void    ImGui_ImplA5_RenderDrawData(ImDrawData* draw_data);
 IMGUI_API bool    ImGui_ImplA5_ProcessEvent(ALLEGRO_EVENT* event);
 
 // Use if you want to reset your rendering device without losing ImGui state.

examples/allegro5_example/main.cpp

@@ -114,6 +114,7 @@ int main(int, char**)
         // Rendering
         al_clear_to_color(al_map_rgba_f(clear_color.x, clear_color.y, clear_color.z, clear_color.w));
         ImGui::Render();
+        ImGui_ImplA5_RenderDrawData(ImGui::GetDrawData());
         al_flip_display();
     }
 

examples/directx10_example/imgui_impl_dx10.cpp

@@ -10,6 +10,7 @@
 
 // CHANGELOG 
 // (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX10_RenderDrawData() in the .h file so you can call it yourself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 //  2018-02-06: Inputs: Honoring the io.WantMoveMouse by repositioning the mouse by using navigation and ImGuiNavFlags_MoveMouse is set.
@@ -57,10 +58,9 @@ struct VERTEX_CONSTANT_BUFFER
     float        mvp[4][4];
 };
 
-// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
-// If text or lines are blurry when integrating ImGui in your engine:
-// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
-void ImGui_ImplDX10_RenderDrawLists(ImDrawData* draw_data)
+// Render function
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
+void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
 {
     ID3D10Device* ctx = g_pd3dDevice;
 
@@ -570,7 +570,6 @@ bool    ImGui_ImplDX10_Init(void* hwnd, ID3D10Device* device)
     io.KeyMap[ImGuiKey_Y] = 'Y';
     io.KeyMap[ImGuiKey_Z] = 'Z';
 
-    io.RenderDrawListsFn = ImGui_ImplDX10_RenderDrawLists;  // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.ImeWindowHandle = g_hWnd;
 
     return true;

examples/directx10_example/imgui_impl_dx10.h

@@ -13,6 +13,7 @@ struct ID3D10Device;
 IMGUI_API bool        ImGui_ImplDX10_Init(void* hwnd, ID3D10Device* device);
 IMGUI_API void        ImGui_ImplDX10_Shutdown();
 IMGUI_API void        ImGui_ImplDX10_NewFrame();
+IMGUI_API void        ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.
 IMGUI_API void        ImGui_ImplDX10_InvalidateDeviceObjects();

examples/directx10_example/main.cpp

@@ -206,6 +206,7 @@ int main(int, char**)
         g_pd3dDevice->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
         g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color);
         ImGui::Render();
+        ImGui_ImplDX10_RenderDrawData(ImGui::GetDrawData());
 
         g_pSwapChain->Present(1, 0); // Present with vsync
         //g_pSwapChain->Present(0, 0); // Present without vsync

examples/directx11_example/imgui_impl_dx11.cpp

@@ -10,6 +10,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX11_RenderDrawData() in the .h file so you can call it yourself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 //  2018-02-06: Inputs: Honoring the io.WantMoveMouse by repositioning the mouse by using navigation and ImGuiNavFlags_MoveMouse is set.
@@ -57,10 +58,9 @@ struct VERTEX_CONSTANT_BUFFER
     float        mvp[4][4];
 };
 
-// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
-// If text or lines are blurry when integrating ImGui in your engine:
-// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
-void ImGui_ImplDX11_RenderDrawLists(ImDrawData* draw_data)
+// Render function
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
+void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
 {
     ID3D11DeviceContext* ctx = g_pd3dDeviceContext;
 
@@ -572,7 +572,6 @@ bool    ImGui_ImplDX11_Init(void* hwnd, ID3D11Device* device, ID3D11DeviceContex
     io.KeyMap[ImGuiKey_Y] = 'Y';
     io.KeyMap[ImGuiKey_Z] = 'Z';
 
-    io.RenderDrawListsFn = ImGui_ImplDX11_RenderDrawLists;  // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.ImeWindowHandle = g_hWnd;
 
     return true;

examples/directx11_example/imgui_impl_dx11.h

@@ -14,6 +14,7 @@ struct ID3D11DeviceContext;
 IMGUI_API bool        ImGui_ImplDX11_Init(void* hwnd, ID3D11Device* device, ID3D11DeviceContext* device_context);
 IMGUI_API void        ImGui_ImplDX11_Shutdown();
 IMGUI_API void        ImGui_ImplDX11_NewFrame();
+IMGUI_API void        ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.
 IMGUI_API void        ImGui_ImplDX11_InvalidateDeviceObjects();

examples/directx11_example/main.cpp

@@ -209,6 +209,7 @@ int main(int, char**)
         g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, (float*)&clear_color);
         ImGui::Render();
+        ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
 
         g_pSwapChain->Present(1, 0); // Present with vsync
         //g_pSwapChain->Present(0, 0); // Present without vsync

examples/directx9_example/imgui_impl_dx9.cpp

@@ -8,6 +8,12 @@
 // If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
 // https://github.com/ocornut/imgui
 
+// CHANGELOG 
+// (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX9_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+//  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
+
 #include "imgui.h"
 #include "imgui_impl_dx9.h"
 
@@ -34,10 +40,9 @@ struct CUSTOMVERTEX
 };
 #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)
 
-// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
-// If text or lines are blurry when integrating ImGui in your engine:
-// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
-void ImGui_ImplDX9_RenderDrawLists(ImDrawData* draw_data)
+// Render function.
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
+void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized
     ImGuiIO& io = ImGui::GetIO();
@@ -276,7 +281,6 @@ bool    ImGui_ImplDX9_Init(void* hwnd, IDirect3DDevice9* device)
     io.KeyMap[ImGuiKey_Y] = 'Y';
     io.KeyMap[ImGuiKey_Z] = 'Z';
 
-    io.RenderDrawListsFn = ImGui_ImplDX9_RenderDrawLists;   // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.ImeWindowHandle = g_hWnd;
 
     return true;

examples/directx9_example/imgui_impl_dx9.h

@@ -13,6 +13,7 @@ struct IDirect3DDevice9;
 IMGUI_API bool        ImGui_ImplDX9_Init(void* hwnd, IDirect3DDevice9* device);
 IMGUI_API void        ImGui_ImplDX9_Shutdown();
 IMGUI_API void        ImGui_ImplDX9_NewFrame();
+IMGUI_API void        ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.
 IMGUI_API void        ImGui_ImplDX9_InvalidateDeviceObjects();

examples/directx9_example/main.cpp

@@ -169,6 +169,7 @@ int main(int, char**)
         if (g_pd3dDevice->BeginScene() >= 0)
         {
             ImGui::Render();
+            ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData());
             g_pd3dDevice->EndScene();
         }
         HRESULT result = g_pd3dDevice->Present(NULL, NULL, NULL, NULL);

examples/marmalade_example/imgui_impl_marmalade.cpp

@@ -11,6 +11,12 @@
 // Copyright (C) 2015 by Giovanni Zito
 // This file is part of ImGui
 
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_Marmalade_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+//  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
+
 #include "imgui.h"
 #include "imgui_impl_marmalade.h"
 
@@ -30,8 +36,9 @@ static bool         g_osdKeyboardEnabled = false;
 // use this setting to scale the interface - e.g. on device you could use 2 or 3 scale factor
 static ImVec2       g_RenderScale = ImVec2(1.0f,1.0f);
 
-// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
-void ImGui_Marmalade_RenderDrawLists(ImDrawData* draw_data)
+// Render function.
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
+void ImGui_Marmalade_RenderDrawData(ImDrawData* draw_data)
 {
     // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays)
     ImGuiIO& io = ImGui::GetIO();
@@ -232,7 +239,6 @@ bool    ImGui_Marmalade_Init(bool install_callbacks)
     io.KeyMap[ImGuiKey_Y] = s3eKeyY;
     io.KeyMap[ImGuiKey_Z] = s3eKeyZ;
 
-    io.RenderDrawListsFn = ImGui_Marmalade_RenderDrawLists;      // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.SetClipboardTextFn = ImGui_Marmalade_SetClipboardText;
     io.GetClipboardTextFn = ImGui_Marmalade_GetClipboardText;
 

examples/marmalade_example/imgui_impl_marmalade.h

@@ -14,6 +14,7 @@
 IMGUI_API bool        ImGui_Marmalade_Init(bool install_callbacks);
 IMGUI_API void        ImGui_Marmalade_Shutdown();
 IMGUI_API void        ImGui_Marmalade_NewFrame();
+IMGUI_API void        ImGui_Marmalade_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.
 IMGUI_API void        ImGui_Marmalade_InvalidateDeviceObjects();

examples/marmalade_example/main.cpp

@@ -100,6 +100,7 @@ int main(int, char**)
         IwGxSetColClear(clear_color.x * 255, clear_color.y * 255, clear_color.z * 255, clear_color.w * 255);
         IwGxClear();
         ImGui::Render();
+        ImGui_Marmalade_RenderDrawData(ImGui::GetDrawData());
         IwGxSwapBuffers();
 
         s3eDeviceYield(0);

examples/opengl2_example/imgui_impl_glfw_gl2.cpp

@@ -19,6 +19,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplGlfwGL2_RenderDrawData() in the .h file so you can call it yourself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 //  2018-01-25: Inputs: Honoring the io.WantMoveMouse by repositioning the mouse by using navigation and ImGuiNavFlags_MoveMouse is set.
@@ -49,10 +50,10 @@ static double       g_Time = 0.0f;
 static bool         g_MouseJustPressed[3] = { false, false, false };
 static GLuint       g_FontTexture = 0;
 
-// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
-void ImGui_ImplGlfwGL2_RenderDrawLists(ImDrawData* draw_data)
+// OpenGL2 Render function.
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so. 
-// If text or lines are blurry when integrating ImGui in your engine: in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
+void ImGui_ImplGlfwGL2_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
     ImGuiIO& io = ImGui::GetIO();
@@ -241,7 +242,6 @@ bool    ImGui_ImplGlfwGL2_Init(GLFWwindow* window, bool install_callbacks)
     io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
     io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
 
-    io.RenderDrawListsFn = ImGui_ImplGlfwGL2_RenderDrawLists;      // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.SetClipboardTextFn = ImGui_ImplGlfwGL2_SetClipboardText;
     io.GetClipboardTextFn = ImGui_ImplGlfwGL2_GetClipboardText;
     io.ClipboardUserData = g_Window;

examples/opengl2_example/imgui_impl_glfw_gl2.h

@@ -18,6 +18,7 @@ struct GLFWwindow;
 IMGUI_API bool        ImGui_ImplGlfwGL2_Init(GLFWwindow* window, bool install_callbacks);
 IMGUI_API void        ImGui_ImplGlfwGL2_Shutdown();
 IMGUI_API void        ImGui_ImplGlfwGL2_NewFrame();
+IMGUI_API void        ImGui_ImplGlfwGL2_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.
 IMGUI_API void        ImGui_ImplGlfwGL2_InvalidateDeviceObjects();

examples/opengl2_example/main.cpp

@@ -110,6 +110,7 @@ int main(int, char**)
         glClear(GL_COLOR_BUFFER_BIT);
         //glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound, but prefer using the GL3+ code.
         ImGui::Render();
+        ImGui_ImplGlfwGL2_RenderDrawData(ImGui::GetDrawData());
         glfwSwapBuffers(window);
     }
 

examples/opengl3_example/imgui_impl_glfw_gl3.cpp

@@ -13,6 +13,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplGlfwGL3_RenderDrawData() in the .h file so you can call it yourself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 //  2018-01-25: Inputs: Added gamepad support if ImGuiNavFlags_EnableGamepad is set.
@@ -50,10 +51,10 @@ static int          g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0;
 static int          g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0;
 static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0;
 
-// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
+// OpenGL3 Render function.
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so. 
-// If text or lines are blurry when integrating ImGui in your engine: in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
-void ImGui_ImplGlfwGL3_RenderDrawLists(ImDrawData* draw_data)
+void ImGui_ImplGlfwGL3_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
     ImGuiIO& io = ImGui::GetIO();
@@ -356,7 +357,6 @@ bool    ImGui_ImplGlfwGL3_Init(GLFWwindow* window, bool install_callbacks)
     io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
     io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
 
-    io.RenderDrawListsFn = ImGui_ImplGlfwGL3_RenderDrawLists;       // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.SetClipboardTextFn = ImGui_ImplGlfwGL3_SetClipboardText;
     io.GetClipboardTextFn = ImGui_ImplGlfwGL3_GetClipboardText;
     io.ClipboardUserData = g_Window;

examples/opengl3_example/imgui_impl_glfw_gl3.h

@@ -16,6 +16,7 @@ struct GLFWwindow;
 IMGUI_API bool        ImGui_ImplGlfwGL3_Init(GLFWwindow* window, bool install_callbacks);
 IMGUI_API void        ImGui_ImplGlfwGL3_Shutdown();
 IMGUI_API void        ImGui_ImplGlfwGL3_NewFrame();
+IMGUI_API void        ImGui_ImplGlfwGL3_RenderDrawData(ImDrawData* draw_data);
 
 // Use if you want to reset your rendering device without losing ImGui state.
 IMGUI_API void        ImGui_ImplGlfwGL3_InvalidateDeviceObjects();

examples/opengl3_example/main.cpp

@@ -115,6 +115,7 @@ int main(int, char**)
         glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
         glClear(GL_COLOR_BUFFER_BIT);
         ImGui::Render();
+        ImGui_ImplGlfwGL3_RenderDrawData(ImGui::GetDrawData());
         glfwSwapBuffers(window);
     }
 

examples/sdl_opengl2_example/imgui_impl_sdl_gl2.cpp

@@ -19,6 +19,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL2_RenderDrawData() in the .h file so you can call it yourself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 //  2018-02-05: Misc: Using SDL_GetPerformanceCounter() instead of SDL_GetTicks() to be able to handle very high framerate (1000+ FPS).
@@ -43,10 +44,10 @@ static Uint64       g_Time = 0;
 static bool         g_MousePressed[3] = { false, false, false };
 static GLuint       g_FontTexture = 0;
 
-// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
+// OpenGL2 Render function.
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so. 
-// If text or lines are blurry when integrating ImGui in your engine: in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
-void ImGui_ImplSdlGL2_RenderDrawLists(ImDrawData* draw_data)
+void ImGui_ImplSdlGL2_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
     ImGuiIO& io = ImGui::GetIO();
@@ -245,7 +246,6 @@ bool    ImGui_ImplSdlGL2_Init(SDL_Window* window)
     io.KeyMap[ImGuiKey_Y] = SDL_SCANCODE_Y;
     io.KeyMap[ImGuiKey_Z] = SDL_SCANCODE_Z;
 
-    io.RenderDrawListsFn = ImGui_ImplSdlGL2_RenderDrawLists;   // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.SetClipboardTextFn = ImGui_ImplSdlGL2_SetClipboardText;
     io.GetClipboardTextFn = ImGui_ImplSdlGL2_GetClipboardText;
     io.ClipboardUserData = NULL;

examples/sdl_opengl2_example/imgui_impl_sdl_gl2.h

@@ -19,6 +19,7 @@ typedef union SDL_Event SDL_Event;
 IMGUI_API bool        ImGui_ImplSdlGL2_Init(SDL_Window* window);
 IMGUI_API void        ImGui_ImplSdlGL2_Shutdown();
 IMGUI_API void        ImGui_ImplSdlGL2_NewFrame(SDL_Window* window);
+IMGUI_API void        ImGui_ImplSdlGL2_RenderDrawData(ImDrawData* draw_data);
 IMGUI_API bool        ImGui_ImplSdlGL2_ProcessEvent(SDL_Event* event);
 
 // Use if you want to reset your rendering device without losing ImGui state.

examples/sdl_opengl2_example/main.cpp

@@ -122,6 +122,7 @@ int main(int, char**)
         glClear(GL_COLOR_BUFFER_BIT);
         //glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
         ImGui::Render();
+        ImGui_ImplSdlGL2_RenderDrawData(ImGui::GetDrawData());
         SDL_GL_SwapWindow(window);
     }
 

examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp

@@ -12,6 +12,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL3_RenderDrawData() in the .h file so you can call it yourself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 //  2018-02-05: Misc: Using SDL_GetPerformanceCounter() instead of SDL_GetTicks() to be able to handle very high framerate (1000+ FPS).
@@ -48,7 +49,7 @@ static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0;
 // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
 // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so. 
 // If text or lines are blurry when integrating ImGui in your engine: in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
-void ImGui_ImplSdlGL3_RenderDrawLists(ImDrawData* draw_data)
+void ImGui_ImplSdlGL3_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
     ImGuiIO& io = ImGui::GetIO();
@@ -359,7 +360,6 @@ bool    ImGui_ImplSdlGL3_Init(SDL_Window* window)
     io.KeyMap[ImGuiKey_Y] = SDL_SCANCODE_Y;
     io.KeyMap[ImGuiKey_Z] = SDL_SCANCODE_Z;
 
-    io.RenderDrawListsFn = ImGui_ImplSdlGL3_RenderDrawLists;   // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText;
     io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText;
     io.ClipboardUserData = NULL;

examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h

@@ -16,6 +16,7 @@ typedef union SDL_Event SDL_Event;
 IMGUI_API bool        ImGui_ImplSdlGL3_Init(SDL_Window* window);
 IMGUI_API void        ImGui_ImplSdlGL3_Shutdown();
 IMGUI_API void        ImGui_ImplSdlGL3_NewFrame(SDL_Window* window);
+IMGUI_API void        ImGui_ImplSdlGL3_RenderDrawData(ImDrawData* draw_data);
 IMGUI_API bool        ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event);
 
 // Use if you want to reset your rendering device without losing ImGui state.

examples/sdl_opengl3_example/main.cpp

@@ -121,6 +121,7 @@ int main(int, char**)
         glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
         glClear(GL_COLOR_BUFFER_BIT);
         ImGui::Render();
+        ImGui_ImplSdlGL3_RenderDrawData(ImGui::GetDrawData());
         SDL_GL_SwapWindow(window);
     }
 

examples/vulkan_example/imgui_impl_glfw_vulkan.cpp

@@ -10,6 +10,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback, ImGui_ImplGlfwVulkan_Render() calls ImGui_ImplGlfwVulkan_RenderDrawData() itself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
 //  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
 //  2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
@@ -165,7 +166,7 @@ static void ImGui_ImplGlfwVulkan_VkResult(VkResult err)
 }
 
 // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
-void ImGui_ImplGlfwVulkan_RenderDrawLists(ImDrawData* draw_data)
+void ImGui_ImplGlfwVulkan_RenderDrawData(ImDrawData* draw_data)
 {
     VkResult err;
     ImGuiIO& io = ImGui::GetIO();
@@ -778,7 +779,6 @@ bool    ImGui_ImplGlfwVulkan_Init(GLFWwindow* window, bool install_callbacks, Im
     io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
     io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
 
-    io.RenderDrawListsFn = ImGui_ImplGlfwVulkan_RenderDrawLists;       // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
     io.SetClipboardTextFn = ImGui_ImplGlfwVulkan_SetClipboardText;
     io.GetClipboardTextFn = ImGui_ImplGlfwVulkan_GetClipboardText;
     io.ClipboardUserData = g_Window;
@@ -851,6 +851,7 @@ void ImGui_ImplGlfwVulkan_Render(VkCommandBuffer command_buffer)
 {
     g_CommandBuffer = command_buffer;
     ImGui::Render();
+    ImGui_ImplGlfwVulkan_RenderDrawData(ImGui::GetDrawData());
     g_CommandBuffer = VK_NULL_HANDLE;
     g_FrameIndex = (g_FrameIndex + 1) % IMGUI_VK_QUEUED_FRAMES;
 }

imgui.cpp

@@ -131,7 +131,6 @@
      ImGuiIO& io = ImGui::GetIO();
      io.DisplaySize.x = 1920.0f;
      io.DisplaySize.y = 1280.0f;
-     io.RenderDrawListsFn = MyRenderFunction;  // Setup a render function, or set to NULL and call GetDrawData() after Render() to access render data.
      // TODO: Fill others settings of the io structure later.
 
      // Load texture atlas (there is a default font so you don't need to care about choosing a font yet)
@@ -162,6 +161,7 @@
      
         // Render & swap video buffers
         ImGui::Render();
+        MyImGuiRenderFunction(ImGui::GetDrawData());
         SwapBuffers();
      }
 
@@ -250,6 +250,7 @@
  Here is a change-log of API breaking changes, if you are using one of the functions listed, expect to have to fix some code.
  Also read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2018/02/16 (1.60) - obsoleted the io.RenderDrawListsFn callback, you can call your graphics engine render function after ImGui::Render(). Use ImGui::GetDrawData() to retrieve the ImDrawData* to display.
  - 2018/02/07 (1.60) - reorganized context handling to be more explicit,
                        - YOU NOW NEED TO CALL ImGui::CreateContext() AT THE BEGINNING OF YOUR APP, AND CALL ImGui::DestroyContext() AT THE END.
                        - removed Shutdown() function, as DestroyContext() serve this purpose.
@@ -882,15 +883,18 @@ ImGuiIO::ImGuiIO()
     OptMacOSXBehaviors = false;
 #endif
     OptCursorBlink = true;
-                                
+
     // Settings (User Functions)
-    RenderDrawListsFn = NULL;
     GetClipboardTextFn = GetClipboardTextFn_DefaultImpl;   // Platform dependent default implementations
     SetClipboardTextFn = SetClipboardTextFn_DefaultImpl;
     ClipboardUserData = NULL;
     ImeSetInputScreenPosFn = ImeSetInputScreenPosFn_DefaultImpl;
     ImeWindowHandle = NULL;
 
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    RenderDrawListsFn = NULL;
+#endif
+
     // Input (NB: we already have memset zero the entire structure)
     MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
     MousePosPrev = ImVec2(-FLT_MAX, -FLT_MAX);
@@ -2657,7 +2661,7 @@ ImGuiStyle& ImGui::GetStyle()
     return GImGui->Style;
 }
 
-// Same value as passed to your RenderDrawListsFn() function. valid after Render() and until the next call to NewFrame()
+// Same value as passed to the old io.RenderDrawListsFn function. Valid after Render() and until the next call to NewFrame()
 ImDrawData* ImGui::GetDrawData()
 {
     return GImGui->DrawData.Valid ? &GImGui->DrawData : NULL;
@@ -4079,8 +4083,10 @@ void ImGui::Render()
         g.IO.MetricsRenderIndices = g.DrawData.TotalIdxCount;
 
         // Render. If user hasn't set a callback then they may retrieve the draw data via GetDrawData()
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
         if (g.DrawData.CmdListsCount > 0 && g.IO.RenderDrawListsFn != NULL)
             g.IO.RenderDrawListsFn(&g.DrawData);
+#endif
     }
 }
 

imgui.h

@@ -147,9 +147,9 @@ namespace ImGui
     // Main
     IMGUI_API ImGuiIO&      GetIO();
     IMGUI_API ImGuiStyle&   GetStyle();
-    IMGUI_API ImDrawData*   GetDrawData();                              // same value as passed to your io.RenderDrawListsFn() function. valid after Render() and until the next call to NewFrame()
     IMGUI_API void          NewFrame();                                 // start a new ImGui frame, you can submit any command from this point until Render()/EndFrame().
-    IMGUI_API void          Render();                                   // ends the ImGui frame, finalize the draw data, then call your io.RenderDrawListsFn() function if set.
+    IMGUI_API void          Render();                                   // ends the ImGui frame, finalize the draw data. (Obsolete: optionally call io.RenderDrawListsFn if set. Nowadays, prefer calling your render function yourself.)
+    IMGUI_API ImDrawData*   GetDrawData();                              // valid after Render() and until the next call to NewFrame(). this is what you have to render. (Obsolete: this used to be passed to your io.RenderDrawListsFn() function.)
     IMGUI_API void          EndFrame();                                 // ends the ImGui frame. automatically called by Render(), so most likely don't need to ever call that yourself directly. If you don't need to render you may call EndFrame() but you'll have wasted CPU already. If you don't need to render, better to not create any imgui windows instead!
 
     // Demo, Debug, Informations
@@ -981,11 +981,6 @@ struct ImGuiIO
     // Settings (User Functions)
     //------------------------------------------------------------------
 
-    // Rendering function, will be called in Render().
-    // Alternatively you can keep this to NULL and call GetDrawData() after Render() to get the same pointer.
-    // See example applications if you are unsure of how to implement this.
-    void        (*RenderDrawListsFn)(ImDrawData* data);
-
     // Optional: access OS clipboard
     // (default to use native Win32 clipboard on Windows, otherwise uses a private clipboard. Override to access OS clipboard on other architectures)
     const char* (*GetClipboardTextFn)(void* user_data);
@@ -997,6 +992,12 @@ struct ImGuiIO
     void        (*ImeSetInputScreenPosFn)(int x, int y);
     void*       ImeWindowHandle;            // (Windows) Set this to your HWND to get automatic IME cursor positioning.
 
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    // [OBSOLETE] Rendering function, will be automatically called in Render(). Please call your rendering function yourself now! You can obtain the ImDrawData* by calling ImGui::GetDrawData() after Render().
+    // See example applications if you are unsure of how to implement this.
+    void        (*RenderDrawListsFn)(ImDrawData* data);
+#endif
+
     //------------------------------------------------------------------
     // Input - Fill before calling NewFrame()
     //------------------------------------------------------------------