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;
 }