[1.15.2] How can I render a texture on top of the screen?

[Alicrack]

I want to overlay a texture on top of the screen, like carved pumpkins do when equipped or when a totem of undying is being used, and dont know how can i implement it. I tried looking inside of carved pumpkins code, totem of undying or anywhere else, but didnt find anything related. Also, I want implement this texture overlay behaviour through renderParticle method in my CustomParticle class

Edited July 16, 2020 by Alicrack

[Dzuchun]

54 minutes ago, Alicrack said:

I want to overlay a texture on top of the screen, like carved pumpkins do when equipped or when a totem of undying is being used, and dont know how can i implement it. I tried looking inside of carved pumpkins code, totem of undying or anywhere else, but didnt find anything related. Also, I want implement this texture overlay behaviour through renderParticle method in my CustomParticle class

I think, this is rendered as gui. So probably you need to subscribe on RenderGameOverlayEvent, but instead use Pre subclass, if you need to be behind the actual gui (not sure). Here is my code example:
 

@SubscribeEvent
public static void drawManaBar(RenderGameOverlayEvent.Post event) {
  if (event.getType().equals(ElementType.HEALTH)) {
    if (minecraft == null) {
    	minecraft = Minecraft.getInstance();
    }

    if (!Minecraft.isGuiEnabled()) {
    	return;
	}

    if (minecraft.world == null) {
    	return;
    }

    minecraft.getTextureManager().bindTexture(TestMod.MANA_BAR);

    RenderSystem.pushTextureAttributes();
    RenderSystem.enableAlphaTest(); //I experimented with these a lot, not sure it works now as intended.

    fullPartial = getCurrentMana()/getMaxMana();

    //Not sure this works well, but it's the main idea.
    bufferbuilder = Tessellator.getInstance().getBuffer();
    bufferbuilder.begin(7, DefaultVertexFormats.POSITION_TEX);

	//Here is actual render code:
    //Rendering empty part
    bufferbuilder.pos(80f, 20f, 0).tex(0f, 0f).endVertex();
    bufferbuilder.pos(120f, 20f, 0).tex(0.5f, 0f).endVertex();
    bufferbuilder.pos(120f, 20f + (1-fullPartial) * 80f, 0).tex(0.5f, 1-fullPartial).endVertex();
    bufferbuilder.pos(80f, 20f + (1-fullPartial) * 80f, 0).tex(0f, 1-fullPartial).endVertex();

    //Rendering full part
    bufferbuilder.pos(80f, 20f + (1-fullPartial) * 80f, 0).tex(0.5f, 1-fullPartial).endVertex();
    bufferbuilder.pos(120f, 20f + (1-fullPartial) * 80f, 0).tex(1f, 1-fullPartial).endVertex();
    bufferbuilder.pos(120f, 100f, 0).tex(1f, 1).endVertex();
    bufferbuilder.pos(80f, 100f, 0).tex(0.5f, 1).endVertex();

    bufferbuilder.finishDrawing();
    WorldVertexBufferUploader.draw(bufferbuilder);

    RenderSystem.disableAlphaTest();
    RenderSystem.popAttributes();

    minecraft.getTextureManager().bindTexture(AbstractGui.GUI_ICONS_LOCATION); //I'm using .Post event, but anyway gui breaks, if you won's do that.
  }    
}

 

Also you may look at other ElementType instances and find HELMET one there. I suspect, that's what you need.

 

You won't find any mention about rendering at pumpkin Block/Item instance, because, I believe, render is made through subscribing to event, so actual render code can be anywhere.

Edited July 16, 2020 by Dzuchun
GenderGameOverlayEvent, omg...

[Alicrack]

13 minutes ago, Dzuchun said:

I think, this is rendered as gui. So probably you need to subscribe on GenderGameOverlayEvent, but instead use Pre subclass, if you need to be behind the actual gui (not sure). Here is my code example:
 

@SubscribeEvent
public static void drawManaBar(RenderGameOverlayEvent.Post event) {
  if (event.getType().equals(ElementType.HEALTH)) {
    if (minecraft == null) {
    	minecraft = Minecraft.getInstance();
    }

    if (!Minecraft.isGuiEnabled()) {
    	return;
	}

    if (minecraft.world == null) {
    	return;
    }

    minecraft.getTextureManager().bindTexture(TestMod.MANA_BAR);

    RenderSystem.pushTextureAttributes();
    RenderSystem.enableAlphaTest(); //I experimented with these a lot, not sure it works now as intended.

    fullPartial = getCurrentMana()/getMaxMana();

    //Not sure this works well, but it's the main idea.
    bufferbuilder = Tessellator.getInstance().getBuffer();
    bufferbuilder.begin(7, DefaultVertexFormats.POSITION_TEX);

	//Here is actual render code:
    //Rendering empty part
    bufferbuilder.pos(80f, 20f, 0).tex(0f, 0f).endVertex();
    bufferbuilder.pos(120f, 20f, 0).tex(0.5f, 0f).endVertex();
    bufferbuilder.pos(120f, 20f + (1-fullPartial) * 80f, 0).tex(0.5f, 1-fullPartial).endVertex();
    bufferbuilder.pos(80f, 20f + (1-fullPartial) * 80f, 0).tex(0f, 1-fullPartial).endVertex();

    //Rendering full part
    bufferbuilder.pos(80f, 20f + (1-fullPartial) * 80f, 0).tex(0.5f, 1-fullPartial).endVertex();
    bufferbuilder.pos(120f, 20f + (1-fullPartial) * 80f, 0).tex(1f, 1-fullPartial).endVertex();
    bufferbuilder.pos(120f, 100f, 0).tex(1f, 1).endVertex();
    bufferbuilder.pos(80f, 100f, 0).tex(0.5f, 1).endVertex();

    bufferbuilder.finishDrawing();
    WorldVertexBufferUploader.draw(bufferbuilder);

    RenderSystem.disableAlphaTest();
    RenderSystem.popAttributes();

    minecraft.getTextureManager().bindTexture(AbstractGui.GUI_ICONS_LOCATION); //I'm using .Post event, but anyway gui breaks, if you won's do that.
  }    
}

 

Also you may look at other ElementType instances and find HELMET one there. I suspect, that's what you need.

 

You won't find any mention about rendering at pumpkin Block/Item instance, because, I believe, render is made through subscribing to event, so actual render code can be anywhere.

Thanks,but I still do not understand what BufferBuilder is, also, do you have any learning material about rendering I can take lesson from?

[poopoodice]

You can check ForgeInGameGui/InGameGui, there are a lot of similar rendering going on there.

[Dzuchun]

6 minutes ago, Alicrack said:

learning material about rendering I can take lesson from?

Here You are:

https://youtu.be/gZ-8F94UT7k

he uses BufferBuilder for rendering TE, but same can be done anywhere, you only need to accuire a correct BufferBuilder.

Of course, it's not complete guide, and someone may propose better one, would be gracefull, too.

[Alicrack]

3 minutes ago, poopoodice said:

You can check ForgeInGameGui/InGameGui, there are a lot of similar rendering going on there.

 

2 minutes ago, Dzuchun said:

Here You are:

https://youtu.be/gZ-8F94UT7k

he uses BufferBuilder for rendering TE, but same can be done anywhere, you only need to accuire a correct BufferBuilder.

Of course, it's not complete guide, and someone may propose better one, would be gracefull, too.

Thank you for support, I already found carvedPumpkinOverlay in ForgeInGameGui and will use it