Font Displays Corrupted on XSX/PS5

[JOSKevinW]

We've recently integrated Cog into our Unreal Engine using 5.2.1. We've encountered the font looks corrupted when on the XSX and PS5 platforms; they look correct on Windows. When we increase the DpiScale, it still looks incorrect. Do you expect that this would work on these other platforms too?

[arnaud-jamin]

Hello,

I was not able to test on other platforms than PC. I do not have any devkit.

Sorry.

[arnaud-jamin]

Btw, the code handling the font in Cog is very small. Imgui is handling 99% of it.

[JOSKevinW]

This appears to be addressed by replacing the texture loading code in FCogImguiContext::BuildFont.

It's also notable that the texture format is not PF_R8G8B8A8, it is 4 bytes per pixel, not 8.

`FontAtlasTexture = UTexture2D::CreateTransient(TextureWidth, TextureHeight);
FontAtlasTexture->UpdateResource();

auto SrcDataCleanup = [](uint8* Data) { delete[] Data; };

FUpdateTextureRegion2D* TextureRegion = new FUpdateTextureRegion2D(0, 0, 0, 0, TextureWidth, TextureHeight);
auto DataCleanup = [SrcDataCleanup](uint8* Data, const FUpdateTextureRegion2D* UpdateRegion)
{
	delete UpdateRegion;
};
FontAtlasTexture->UpdateTextureRegions(0, 1u, TextureRegion, BytesPerPixel * TextureWidth, BytesPerPixel, TextureDataRaw, DataCleanup);`

As a separate issue, Cog rendered on console is very small as opposed to PC. I adapted SCogImguiWidget::OnPaint's calculation of Transform to match what imGui's Unreal integration does. The original code only accounts for transform and not scale.

FSlateRenderTransform displayPosition(DrawData.DisplayPos); const FSlateRenderTransform& WidgetToScreen = AllottedGeometry.GetAccumulatedRenderTransform(); const FSlateRenderTransform Transform = FCogImguiHelper::RoundTranslation(displayPosition.Concatenate(WidgetToScreen));

[arnaud-jamin]

Thanks a lot for the research! Don't hesitate to make a pull request!

Sorry I didn't reply sooner, was too busy.

[JailbreakPapa]

This appears to be addressed by replacing the texture loading code in FCogImguiContext::BuildFont.

It's also notable that the texture format is not PF_R8G8B8A8, it is 4 bytes per pixel, not 8.

`FontAtlasTexture = UTexture2D::CreateTransient(TextureWidth, TextureHeight); FontAtlasTexture->UpdateResource();

auto SrcDataCleanup = [](uint8* Data) { delete[] Data; };

FUpdateTextureRegion2D* TextureRegion = new FUpdateTextureRegion2D(0, 0, 0, 0, TextureWidth, TextureHeight);
auto DataCleanup = [SrcDataCleanup](uint8* Data, const FUpdateTextureRegion2D* UpdateRegion)
{
	delete UpdateRegion;
};
FontAtlasTexture->UpdateTextureRegions(0, 1u, TextureRegion, BytesPerPixel * TextureWidth, BytesPerPixel, TextureDataRaw, DataCleanup);`

As a separate issue, Cog rendered on console is very small as opposed to PC. I adapted SCogImguiWidget::OnPaint's calculation of Transform to match what imGui's Unreal integration does. The original code only accounts for transform and not scale.

FSlateRenderTransform displayPosition(DrawData.DisplayPos); const FSlateRenderTransform& WidgetToScreen = AllottedGeometry.GetAccumulatedRenderTransform(); const FSlateRenderTransform Transform = FCogImguiHelper::RoundTranslation(displayPosition.Concatenate(WidgetToScreen));

Thanks for these fixes! we just started using cog and were wondering why fonts were messing up.