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Backends: SDL_Renderer: Backup and restore modified ClipRect/Viewport. (#3926, #4582)

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ocornut 2021-10-06 13:41:29 +02:00
parent 30db674147
commit e443ea139d
1 changed files with 15 additions and 0 deletions
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15
backends/imgui_impl_sdlrenderer.cpp
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@ -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 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
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 @@ void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
}
}
}
// Restore modified SDL_Renderer state
SDL_RenderSetViewport(bd->SDLRenderer, &old.Viewport);
SDL_RenderSetClipRect(bd->SDLRenderer, &old.ClipRect);
}
// Called by Init/NewFrame/Shutdown