Backends: SDL_Renderer: Backup and restore modified ClipRect/Viewport. (#3926, #4582)
diff --git a/backends/imgui_impl_sdlrenderer.cpp b/backends/imgui_impl_sdlrenderer.cpp
index 4f564f4..ff16311 100644
--- a/backends/imgui_impl_sdlrenderer.cpp
+++ b/backends/imgui_impl_sdlrenderer.cpp
@@ -15,6 +15,7 @@
// Read online: https://github.com/ocornut/imgui/tree/master/docs
// CHANGELOG
+// 2021-10-06: Backup and restore modified ClipRect/Viewport.
// 2021-09-21: Initial version.
#include "imgui.h"
@@ -115,6 +116,16 @@
if (fb_width == 0 || fb_height == 0)
return;
+ // Backup SDL_Renderer state that will be modified to restore it afterwards
+ struct BackupSDLRendererState
+ {
+ SDL_Rect Viewport;
+ SDL_Rect ClipRect;
+ };
+ BackupSDLRendererState old = {};
+ SDL_RenderGetViewport(bd->SDLRenderer, &old.Viewport);
+ SDL_RenderGetClipRect(bd->SDLRenderer, &old.ClipRect);
+
// 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;
@@ -169,6 +180,10 @@
}
}
}
+
+ // Restore modified SDL_Renderer state
+ SDL_RenderSetViewport(bd->SDLRenderer, &old.Viewport);
+ SDL_RenderSetClipRect(bd->SDLRenderer, &old.ClipRect);
}
// Called by Init/NewFrame/Shutdown
