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[Solved] Draw simple 2D shape in custom ItemRenderer

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I made a custom IItemRenderer implementation to render items in inventory slots. Now I need to draw a simple 2D polygonal shape in the inventory item slot.

 

The javadoc says:

If rendering as a 2D texture, the rendering should be in GUI pixel coordinates from (0, 0, 0)-(16, 16, 0)

 

So I thought the code should look something like this:

 

// Draw a semi-transparent red square
GL11.glColor4f(1.0f, 0f, 0f, 0.5f);
GL11.glBegin(GL11.GL_QUADS);
GL11.glVertex3f(0F, 0F, 0F);
GL11.glVertex3f(16F, 0F, 0F);
GL11.glVertex3f(16F, 16F, 0F);
GL11.glVertex3f(0F, 16F, 0F);
GL11.glEnd();

 

But nothing appears in the item slot. Can anyone help me with this?

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