Backends: SDL_Renderer3: fixed changing scale mode not actually working on all platforms. (#7616, #9470, #9378)

backends/imgui_impl_sdlrenderer3.cpp

@@ -171,6 +171,7 @@ void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
     // Will project scissor/clipping rectangles into framebuffer space
     ImVec2 clip_off = draw_data->DisplayPos;         // (0,0) unless using multi-viewports
     ImVec2 clip_scale = render_scale;
+    SDL_ScaleMode last_scale_mode = bd->CurrentScaleMode;
 
     // Render command lists
     for (const ImDrawList* draw_list : draw_data->CmdLists)
@@ -208,6 +209,9 @@ void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
                 const float* uv = (const float*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + offsetof(ImDrawVert, uv));
                 const SDL_Color* color = (const SDL_Color*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + offsetof(ImDrawVert, col)); // SDL 2.0.19+
 
+                if (last_scale_mode != bd->CurrentScaleMode)
+                    SDL_FlushRenderer(renderer);
+
                 // Bind texture, Draw
                 SDL_Texture* tex = (SDL_Texture*)pcmd->GetTexID();
                 SDL_SetTextureScaleMode(tex, bd->CurrentScaleMode);

docs/CHANGELOG.txt

@@ -159,6 +159,7 @@ Other Changes:
     - Expose selected render state in ImGui_ImplOpenGL3_RenderState, allowing to
       dynamically select between use of glBindSampler() and glTexParameter(). (#9378)
   - SDLRenderer3:
+    - Fixed sampler change which didn't work on all graphics backends. (#7616, #9470, #9378)
     - Fixed default sampler not being Linear. Regression in 1.92.8. (#7616, #9470, #9378) [@ShiroKSH]
   - Win32:
     - Uses `SetProcessDpiAwarenessContext()` instead of `SetThreadDpiAwarenessContext()`