From 82fdd7018d7b0bbd71363bea714bad4881c4d643 Mon Sep 17 00:00:00 2001 From: omar Date: Fri, 13 Jan 2023 17:27:44 +0100 Subject: [PATCH] Update FAQ.md --- docs/FAQ.md | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/docs/FAQ.md b/docs/FAQ.md index e48268cb..9e13d7cf 100644 --- a/docs/FAQ.md +++ b/docs/FAQ.md @@ -178,8 +178,21 @@ Rectangles provided by Dear ImGui are defined as `(x1=left,y1=top,x2=right,y2=bottom)` and **NOT** as `(x1,y1,width,height)`. -Refer to rendering backends in the [examples/](https://github.com/ocornut/imgui/tree/master/examples) folder for references of how to handle the `ClipRect` field. +Refer to rendering backends in the [backends/](https://github.com/ocornut/imgui/tree/master/backends) folder for references of how to handle the `ClipRect` field. +For example, the [DirectX11 backend](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_dx11.cpp) does this: +```cpp +// Project scissor/clipping rectangles into framebuffer space +ImVec2 clip_off = draw_data->DisplayPos; +ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y); +ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y); +if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y) + continue; +// Apply scissor/clipping rectangle +const D3D11_RECT r = { (LONG)clip_min.x, (LONG)clip_min.y, (LONG)clip_max.x, (LONG)clip_max.y }; +ctx->RSSetScissorRects(1, &r); +``` + ##### [Return to Index](#index) ---