(WIP) Dynamic glyph rasterization and unlimited number of font textures

docs/README.md

@@ -1,3 +1,5 @@
+Demonstration video: https://i.imgur.com/4Es7pUg.mp4
+
 Dear ImGui
 =====
 [![Build Status](https://github.com/ocornut/imgui/workflows/build/badge.svg)](https://github.com/ocornut/imgui/actions?workflow=build) [![Static Analysis Status](https://github.com/ocornut/imgui/workflows/static-analysis/badge.svg)](https://github.com/ocornut/imgui/actions?workflow=static-analysis)

examples/example_glfw_opengl2/main.cpp

@@ -61,14 +61,14 @@ int main(int, char**)
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Read 'docs/FONTS.md' for more instructions and details.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
-    //io.Fonts->AddFontDefault();
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
+    io.Fonts->AddFontDefault();
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf");
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf");
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf");
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf");
     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
     //IM_ASSERT(font != NULL);
-
+    
     // Our state
     bool show_demo_window = true;
     bool show_another_window = false;

examples/example_glfw_opengl3/main.cpp

@@ -125,14 +125,14 @@ int main(int, char**)
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Read 'docs/FONTS.md' for more instructions and details.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
-    //io.Fonts->AddFontDefault();
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
+    io.Fonts->AddFontDefault();
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf"/*, 16.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf"/*, 15.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf"/*, 16.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf"/*, 10.0f*/);
     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
     //IM_ASSERT(font != NULL);
-
+    
     // Our state
     bool show_demo_window = true;
     bool show_another_window = false;

examples/example_null/main.cpp

@@ -11,10 +11,11 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO();
 
     // Build atlas
-    unsigned char* tex_pixels = NULL;
-    int tex_w, tex_h;
-    io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_w, &tex_h);
-
+    //unsigned char* tex_pixels = NULL;
+    //int tex_w, tex_h;
+    //io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_w, &tex_h);
+    io.Fonts->AddFontDefault();
+
     for (int n = 0; n < 20; n++)
     {
         printf("NewFrame() %d\n", n);

examples/example_sdl_opengl2/main.cpp

@@ -59,11 +59,11 @@ int main(int, char**)
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Read 'docs/FONTS.md' for more instructions and details.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
-    //io.Fonts->AddFontDefault();
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
+    io.Fonts->AddFontDefault();
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf"/*, 16.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf"/*, 15.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf"/*, 16.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf"/*, 10.0f*/);
     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
     //IM_ASSERT(font != NULL);
 

examples/example_sdl_opengl3/main.cpp

@@ -120,11 +120,11 @@ int main(int, char**)
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Read 'docs/FONTS.md' for more instructions and details.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
-    //io.Fonts->AddFontDefault();
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
+    io.Fonts->AddFontDefault();
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf"/*, 16.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf"/*, 15.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf"/*, 16.0f*/);
+    io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf"/*, 10.0f*/);
     //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
     //IM_ASSERT(font != NULL);
 

examples/imgui_impl_dx10.cpp

@@ -265,9 +265,11 @@ void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
     ctx->IASetInputLayout(old.InputLayout); if (old.InputLayout) old.InputLayout->Release();
 }
 
+//FIXME-DYNAMICFONT: Should be renamed ImGui_ImplDX10_UpdateFontsTextures
 static void ImGui_ImplDX10_CreateFontsTexture()
 {
-    // Build texture atlas
+    // FIXME-DYNAMICFONT: Dynamic font texture update code similar to imgui_impl_opengl3.cpp should be implemented for DirectX 10
+/*    // Build texture atlas
     ImGuiIO& io = ImGui::GetIO();
     unsigned char* pixels;
     int width, height;
@@ -322,6 +324,7 @@ static void ImGui_ImplDX10_CreateFontsTexture()
         desc.MaxLOD = 0.f;
         g_pd3dDevice->CreateSamplerState(&desc, &g_pFontSampler);
     }
+    */
 }
 
 bool    ImGui_ImplDX10_CreateDeviceObjects()
@@ -472,6 +475,7 @@ bool    ImGui_ImplDX10_CreateDeviceObjects()
         g_pd3dDevice->CreateDepthStencilState(&desc, &g_pDepthStencilState);
     }
 
+    // FIXME-DYNAMICFONT: ImGui_ImplDX10_UpdateFontsTexture should replace this function and be called every frame
     ImGui_ImplDX10_CreateFontsTexture();
 
     return true;
@@ -483,7 +487,8 @@ void    ImGui_ImplDX10_InvalidateDeviceObjects()
         return;
 
     if (g_pFontSampler) { g_pFontSampler->Release(); g_pFontSampler = NULL; }
-    if (g_pFontTextureView) { g_pFontTextureView->Release(); g_pFontTextureView = NULL; ImGui::GetIO().Fonts->TexID = NULL; } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    // FIXME-DYNAMICFONT: After destroying a font texture the appropriate ImFontTexture->TexID should be updated
+    if (g_pFontTextureView) { g_pFontTextureView->Release(); g_pFontTextureView = NULL; /*ImGui::GetIO().Fonts->TexID = NULL;*/ } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
     if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
     if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
 

examples/imgui_impl_dx11.cpp

@@ -277,9 +277,10 @@ void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
     ctx->IASetInputLayout(old.InputLayout); if (old.InputLayout) old.InputLayout->Release();
 }
 
+//FIXME-DYNAMICFONT: Should be replaced by ImGui_ImplDX11_UpdateFontTextures called every frame similiar to ImGui_OpenGL3_UpdateFontTextures
 static void ImGui_ImplDX11_CreateFontsTexture()
 {
-    // Build texture atlas
+/*    // Build texture atlas
     ImGuiIO& io = ImGui::GetIO();
     unsigned char* pixels;
     int width, height;
@@ -333,7 +334,7 @@ static void ImGui_ImplDX11_CreateFontsTexture()
         desc.MinLOD = 0.f;
         desc.MaxLOD = 0.f;
         g_pd3dDevice->CreateSamplerState(&desc, &g_pFontSampler);
-    }
+    }*/
 }
 
 bool    ImGui_ImplDX11_CreateDeviceObjects()
@@ -495,7 +496,8 @@ void    ImGui_ImplDX11_InvalidateDeviceObjects()
         return;
 
     if (g_pFontSampler) { g_pFontSampler->Release(); g_pFontSampler = NULL; }
-    if (g_pFontTextureView) { g_pFontTextureView->Release(); g_pFontTextureView = NULL; ImGui::GetIO().Fonts->TexID = NULL; } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    // FIXME-DYNAMICFONT: When destroying the font textures the corresponding ImFontTexture->TexID should be set to NULL
+    if (g_pFontTextureView) { g_pFontTextureView->Release(); g_pFontTextureView = NULL; /*ImGui::GetIO().Fonts->TexID = NULL;*/ } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
     if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
     if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
 

examples/imgui_impl_dx12.cpp

@@ -245,9 +245,10 @@ void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandL
     }
 }
 
+// FIXME-DYNAMICFONT: Should be replaced by ImGui_ImplDX12_UpdateFontTextures and called every frame
 static void ImGui_ImplDX12_CreateFontsTexture()
 {
-    // Build texture atlas
+/*    // Build texture atlas
     ImGuiIO& io = ImGui::GetIO();
     unsigned char* pixels;
     int width, height;
@@ -391,7 +392,7 @@ static void ImGui_ImplDX12_CreateFontsTexture()
 
     // Store our identifier
     static_assert(sizeof(ImTextureID) >= sizeof(g_hFontSrvGpuDescHandle.ptr), "Can't pack descriptor handle into TexID, 32-bit not supported yet.");
-    io.Fonts->TexID = (ImTextureID)g_hFontSrvGpuDescHandle.ptr;
+    io.Fonts->TexID = (ImTextureID)g_hFontSrvGpuDescHandle.ptr;*/
 }
 
 bool    ImGui_ImplDX12_CreateDeviceObjects()
@@ -609,8 +610,9 @@ void    ImGui_ImplDX12_InvalidateDeviceObjects()
     SafeRelease(g_pPipelineState);
     SafeRelease(g_pFontTextureResource);
 
-    ImGuiIO& io = ImGui::GetIO();
-    io.Fonts->TexID = NULL; // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    // FIXME-DYNAMICFONT: When destroying the font textures the corresponding ImFontTexture->TexID should be updated
+//    ImGuiIO& io = ImGui::GetIO();
+//    io.Fonts->TexID = NULL; // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
 
     for (UINT i = 0; i < g_numFramesInFlight; i++)
     {

examples/imgui_impl_dx9.cpp

@@ -234,9 +234,10 @@ void ImGui_ImplDX9_Shutdown()
     if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
 }
 
+// FIXME-DYNAMICFONT: Should be renamed ImGui_ImplDX9_UpdateFontTextures and called every frame
 static bool ImGui_ImplDX9_CreateFontsTexture()
 {
-    // Build texture atlas
+/*    // Build texture atlas
     ImGuiIO& io = ImGui::GetIO();
     unsigned char* pixels;
     int width, height, bytes_per_pixel;
@@ -255,7 +256,7 @@ static bool ImGui_ImplDX9_CreateFontsTexture()
 
     // Store our identifier
     io.Fonts->TexID = (ImTextureID)g_FontTexture;
-
+*/
     return true;
 }
 
@@ -274,7 +275,8 @@ void ImGui_ImplDX9_InvalidateDeviceObjects()
         return;
     if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
     if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
-    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.
+    // FIXME-DYNAMICFONT: After destroying a font the appropriate ImFontTexture->TexID should be updated
+    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()

examples/imgui_impl_glfw.cpp

@@ -345,7 +345,7 @@ static void ImGui_ImplGlfw_UpdateGamepads()
 void ImGui_ImplGlfw_NewFrame()
 {
     ImGuiIO& io = ImGui::GetIO();
-    IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer back-end. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
+    //IM_ASSERT(io.Fonts->FontTextures.Size && "A font texture has not been created.");
 
     // Setup display size (every frame to accommodate for window resizing)
     int w, h;

examples/imgui_impl_opengl2.cpp

@@ -52,8 +52,6 @@
 #include <GL/gl.h>
 #endif
 
-// OpenGL Data
-static GLuint       g_FontTexture = 0;
 
 // Functions
 bool    ImGui_ImplOpenGL2_Init()
@@ -71,8 +69,7 @@ void    ImGui_ImplOpenGL2_Shutdown()
 
 void    ImGui_ImplOpenGL2_NewFrame()
 {
-    if (!g_FontTexture)
-        ImGui_ImplOpenGL2_CreateDeviceObjects();
+    ImGui_ImplOpenGL2_UpdateFontsTexture();
 }
 
 static void ImGui_ImplOpenGL2_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height)
@@ -199,50 +196,84 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, last_tex_env_mode);
 }
 
-bool ImGui_ImplOpenGL2_CreateFontsTexture()
-{
-    // Build texture atlas
-    ImGuiIO& io = ImGui::GetIO();
-    unsigned char* pixels;
-    int width, height;
-    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);   // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
+static ImVector<ImTextureID> g_FontTextures;
 
-    // Upload texture to graphics system
+static ImTextureID CreateOpenGL2Texture(int width, int height, unsigned char* pixels) {
     GLint last_texture;
+    GLuint new_texture;
     glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
-    glGenTextures(1, &g_FontTexture);
-    glBindTexture(GL_TEXTURE_2D, g_FontTexture);
+    glGenTextures(1, &new_texture);
+    glBindTexture(GL_TEXTURE_2D, new_texture);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+#ifdef GL_UNPACK_ROW_LENGTH
     glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+#endif
     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+    return (ImTextureID)(intptr_t)new_texture;
+}
+
+static void UpdateOpenGL2Texture(ImTextureID tex, int x, int y, int width, int height, unsigned char* pixels) {
+    GLint last_texture;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
 
-    // Store our identifier
-    io.Fonts->TexID = (ImTextureID)(intptr_t)g_FontTexture;
+    glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)tex);
+#ifdef GL_UNPACK_ROW_LENGTH
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+#endif
+    glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 
     // Restore state
     glBindTexture(GL_TEXTURE_2D, last_texture);
+}
+
+bool ImGui_ImplOpenGL2_UpdateFontsTexture()
+{
+    ImGuiIO& io = ImGui::GetIO();
+
+    if (io.Fonts->Fonts.Size == 0) //Load a font if there is none
+        io.Fonts->AddFontDefault();
+
+    // FIXME-DYNAMICFONT: Add support for resizing textures
+    for (ImFontTexture** font_texture = io.Fonts->FontTextures.begin(); font_texture != io.Fonts->FontTextures.end(); ++font_texture) {
+        ImFontTexture* font_texture_ptr = *font_texture;
+        if (font_texture_ptr->TexID == NULL) {
+            //This OpenGL texure has not yet been created. Create it.
+            ImTextureID new_texture = CreateOpenGL2Texture(font_texture_ptr->TexWidth, font_texture_ptr->TexHeight, font_texture_ptr->TexData.Data);
+            font_texture_ptr->TexID = new_texture;
+            font_texture_ptr->IsDirty = false;
+            g_FontTextures.push_back(new_texture);
+        }
+
+        if (font_texture_ptr->IsDirty) {
+            //Update whole affected rows
+            int x = 0, y = static_cast<int>(font_texture_ptr->DirtyTopLeft.y);
+            int width = font_texture_ptr->TexWidth, height = static_cast<int>(font_texture_ptr->DirtyBotRight.y) - static_cast<int>(font_texture_ptr->DirtyTopLeft.y) + 1;
+            UpdateOpenGL2Texture(font_texture_ptr->TexID, x, y, width, height, &font_texture_ptr->TexData.Data[y*width * 4]);
+            font_texture_ptr->IsDirty = false;
+        }
+    }
 
     return true;
 }
 
-void ImGui_ImplOpenGL2_DestroyFontsTexture()
+void ImGui_ImplOpenGL2_DestroyFontTextures()
 {
-    if (g_FontTexture)
+    if (g_FontTextures.Size)
     {
         ImGuiIO& io = ImGui::GetIO();
-        glDeleteTextures(1, &g_FontTexture);
-        io.Fonts->TexID = 0;
-        g_FontTexture = 0;
+        for (ImFontTexture** font_texture = io.Fonts->FontTextures.begin(); font_texture != io.Fonts->FontTextures.end(); ++font_texture) {
+            ImFontTexture* font_texture_ptr = *font_texture;
+            g_FontTextures.find_erase(font_texture_ptr->TexID);
+            glDeleteTextures(1, (const GLuint*)(intptr_t*)&font_texture_ptr->TexID);
+            font_texture_ptr->TexID = 0;
+        }
     }
 }
 
-bool    ImGui_ImplOpenGL2_CreateDeviceObjects()
-{
-    return ImGui_ImplOpenGL2_CreateFontsTexture();
-}
 
 void    ImGui_ImplOpenGL2_DestroyDeviceObjects()
 {
-    ImGui_ImplOpenGL2_DestroyFontsTexture();
+    ImGui_ImplOpenGL2_DestroyFontTextures();
 }

examples/imgui_impl_opengl2.h

@@ -25,7 +25,8 @@ IMGUI_IMPL_API void     ImGui_ImplOpenGL2_NewFrame();
 IMGUI_IMPL_API void     ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data);
 
 // Called by Init/NewFrame/Shutdown
-IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateFontsTexture();
-IMGUI_IMPL_API void     ImGui_ImplOpenGL2_DestroyFontsTexture();
-IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateDeviceObjects();
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_UpdateFontsTexture();
+//IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateFontsTexture();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL2_DestroyFontTextures();
+//IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateDeviceObjects();
 IMGUI_IMPL_API void     ImGui_ImplOpenGL2_DestroyDeviceObjects();