[1.12.2] How to draw a black rectangle in the code?

[Romsik788]

How to draw a black rectangle in the code and overlay it in half (vertically) the texture? And how to regulate its transparency?

[jabelar]

If you're running your code in a Gui or child class there are methods for drawing rectangles. For transparency that can be the alpha value in the color, but you may also need to set the blend mode using GlStateManager.