I'm trying to do something like what poison and wither do. They change hearths appearance.
I really can't find how minecraft does that.

You can see how minecraft does that in net.minecraftforge.client.GuiIngameForge#renderHealth. Basically the withered/poisoned hearts are a part of the hud texture and MC just changes the uvs when it detects a certain potion effect active. If you want to replicate that effect you would need to use a RenderGameOverlayEvent to cancel the default hearts rendering when you need it and render your hearts with a different texture.

That seems hard

On 5/11/2018 at 12:38 PM, V0idWa1k3r said:

You can see how minecraft does that in net.minecraftforge.client.GuiIngameForge#renderHealth. Basically the withered/poisoned hearts are a part of the hud texture and MC just changes the uvs when it detects a certain potion effect active. If you want to replicate that effect you would need to use a RenderGameOverlayEvent to cancel the default hearts rendering when you need it and render your hearts with a different texture.

How do I use the rendering functions in the Event?

The same way vanilla uses them in it's GUI

So I must rewrite them? The GUI functions (e.g. drawTextureModal) are not static.

You could. Or you could use BufferBuilder directly.

These are static:

Gui#drawScaledCustomSizeModalRect

Gui#drawModalRectWithCustomSizedTexture

Ok managed to make it. Now the only problem is updateCounter that is a timer decremented every tick. Sadly the RenderGameOverlayEvent is called every frame. How I can get this timer working with ticks instead of frames?