GUI Overlay Transparancy

[Flenix]

Hey guys,

 

This is (hopefully) my final GUI issue, and it's probably something simple.

 

Basically, in the vanilla hotbar you can see there is a transparancy alpha layer; you can see through the bar. In my custom hotbar, even when it's just a copy-paste of the vanilla hotbar render code, this alpha transparency doesn't work.

Anyone got any idea what might cause such a thing?

 

 

Also, while I'm on the subject; is it possible to animate GUI elements, in a similar way to how we animate normal textures? I know I could do it in a long-winded way, running a tick timer and changing the texture coordinates each tick, but that IS very long-winded; is there a shorter way?

[Draco18s]

Make sure you enable glBlend

[Flenix]

Make sure you enable glBlend

 

I have AFAIK- One of the snippets I snagged from the vanilla class.

 

What's interesting and worth noting that I just discovered via a misconfiguration; If my hotbar renders over another widget, the transparancy DOES affect that widget - it seems to only not work on the game itself.

 

Here's my render method:

    @ForgeSubscribe(priority = EventPriority.NORMAL)
public void renderHotbarHorizontal(RenderGameOverlayEvent event) {
    	if (config.hotbarEnabled) {

		double widthMultiplier = getResIncreaseMultiplier("x");
		double heightMultiplier = getResIncreaseMultiplier("y");

		int sizeX = 182;
		int sizeY = 22;

		if (!config.horizontalHotbar) {
			sizeX = 22;
			sizeY = 182;
		}

		int configX = 0;
		int configY = 0;

		if (config.hotbarAnchor == 0 || config.hotbarAnchor >  {
			configX = (int) Math.round(config.hotbarXPos * widthMultiplier);
			configY = (int) Math.round(config.hotbarYPos * heightMultiplier);
		} else {
			configX = calculateAnchorPointX(config.hotbarAnchor, sizeX);
			configY = calculateAnchorPointY(config.hotbarAnchor, sizeY);
		}

		int xPos = configX + config.hotbarXOffset;
		int yPos = configY + config.hotbarYOffset;

        GL11.glEnable(GL11.GL_BLEND);
        GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
        GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
        mc.renderEngine.bindTexture(guiStatsBar);
        
        if (config.horizontalHotbar) {
        	InventoryPlayer inv = mc.thePlayer.inventory;
            drawTexturedModalRect(xPos, yPos, 0, 168, sizeX, sizeY);
            drawTexturedModalRect(xPos - 1 + (inv.currentItem * 20), yPos - 1, 182, 168, 24, 24);

        	GL11.glDisable(GL11.GL_BLEND);
        	GL11.glEnable(GL12.GL_RESCALE_NORMAL);
        	RenderHelper.enableGUIStandardItemLighting();

        	for (int i = 0; i < 9; ++i) {
                int x = xPos +  (i * 20) + 2;
                int z = yPos - 3;
        		renderInventorySlot(i, x, z, 1.0F);
        	}
        } else {
        	InventoryPlayer inv = mc.thePlayer.inventory;
	        drawTexturedModalRect(xPos, yPos, 234, 0, sizeX, sizeY);
	        drawTexturedModalRect(xPos - 1, yPos - 1 + (inv.currentItem * 20), 182, 168, 24, 24);

	        GL11.glDisable(GL11.GL_BLEND);
	        GL11.glEnable(GL12.GL_RESCALE_NORMAL);
	        RenderHelper.enableGUIStandardItemLighting();
	        
            for (int i = 0; i < 9; ++i) {
                int x = xPos + 3;
                int z = yPos + (i * 20) + 2;
                renderInventorySlot(i, x, z, 1.0F);
            }
        }

        RenderHelper.disableStandardItemLighting();
        GL11.glDisable(GL12.GL_RESCALE_NORMAL);
    	}
}

[Flenix]

Realized that what I said about widget transparency might sound a bit confusing; here's a screenshot to try and clear it up:

 

 

The solid white squares should have alpha transparency. You can see the health bar through it, but you can't see the game world.