Backends: SDL_Renderer: Handle change to SDL_RenderGeometryRaw() function signature in SDL 2.0.19 (#4819)

backends/imgui_impl_sdlrenderer.cpp

@@ -18,6 +18,7 @@
 // Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 // CHANGELOG
+//  2021-12-21: Update SDL_RenderGeometryRaw() format to work with SDL 2.0.19.
 //  2021-12-03: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2021-10-06: Backup and restore modified ClipRect/Viewport.
 //  2021-09-21: Initial version.
@@ -174,7 +175,11 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
 
                 const float* xy = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, pos));
                 const float* uv = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, uv));
-                const int* color = (const int*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col));
+#if SDL_VERSION_ATLEAST(2,0,19)
+                const SDL_Color* color = (const SDL_Color*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.19+
+#else
+                const int* color = (const int*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.17 and 2.0.18
+#endif
 
                 // Bind texture, Draw
 				SDL_Texture* tex = (SDL_Texture*)pcmd->GetTexID();

docs/CHANGELOG.txt

@@ -117,6 +117,7 @@ Other Changes:
 - Backends: DX12: Fixed DRAW_EMPTY_SCISSOR_RECTANGLE warnings. (#4775)
 - Backends: SDL_Renderer: Added support for large meshes (64k+ vertices) with 16-bit indices,
   enabling 'ImGuiBackendFlags_RendererHasVtxOffset' in the backend. (#3926) [@rokups]
+- Backends: SDL_Renderer: Fix for SDL 2.0.19+ RenderGeometryRaw() API signature change. (#4819) [@sridenour]
 - Backends: OSX: Generally fix keyboard support. Keyboard arrays indexed using kVK_* codes, e.g.
   ImGui::IsKeyPressed(kVK_Space). Don't set mouse cursor shape unconditionally. Handle two fingers scroll
   cancel event. (#4759, #4253, #1873) [@stuartcarnie]