Blurry background

[wajsic]

What would be the easiest way to achieve semi-transparent window with blurry effect in the way like IOS does it.

https://koenig-media.raywenderlich.com/uploads/2014/09/blurs.png

[ocornut]

It's not really the type of thing dear imgui is designed for.

Rendering wise, if we could mark the associated vertices in the draw data, the user-side render code could perform that sort of effect. An hacky-proof of concept would be that for each ImDrawList of the ImDrawData, you look at the first ImDrawCmd and use those vertices or just the bounding box to blur behind. Blurring typically involve multiple targets so getting that to work with an arbitrary number of floating windows may be tricky.

[edin-purkovic]

Unrimp does that, check out the source... https://github.com/cofenberg/unrimp/

[ocornut]

Code appears to be
https://github.com/cofenberg/unrimp/blob/45aa431286ce597c018675c1a9730d98e6ccfc64/Renderer/RendererRuntime/src/DebugGui/DebugGuiManager.cpp
+
Basic shader (no blurring)
https://github.com/cofenberg/unrimp/blob/45aa431286ce597c018675c1a9730d98e6ccfc64/Renderer/RendererRuntime/src/DebugGui/Detail/Shader/DebugGui_GLSL_410.h

Don't quite understand where the blurring is done.

[wajsic]

@edin-purkovic Would you be so kind and build D3D9 and D3D11 example and upload the binaries since I cant seem to build the project so I can examine them with graphics debugger and figure out what's going on with that code.

[edin-purkovic]

I assume you're on Windows and have cmake installed.. I had no problems building it with
"cd build" "cmake -G "Visual Studio 15 ..", (for latest visual studio) i just had to lower the warning level for every project to compile because VS sets it on highest for some reason...

[wajsic]

Yea, lowering the warning level did the trick. Thanks.

[edin-purkovic]

Looks like he uses his own compositor framework and this shader/shader language for bluring the gui:
https://github.com/cofenberg/unrimp/blob/master/bin/DataSource/Content/ShaderBlueprint/Debug/GuiFragment.shader_blueprint
Hope you will have more luck with g debugger to figure it out because it's kinda hard to track all those extern compositor files and blueprints..

[ocornut]

I am going to mark this a closed issue, as it isn't really the desired scope of imgui and can be handled at user's level.

If you find a nice solution or have screenshots to post don't hesitate to post them here! It's always nice to record references for others who might be interested in similar stuff.