I've been trying to work on something that requires me to draw directly to the screen.

I started with a simple test, drawing a red square at the corner of the screen with the Vertex buffer.

It works, but I've noticed some very strange behavior, whenever i press F1 to hide the GUI, the square i drew becomes about twice as small and looses all transparency. If i press F1 again to show the GUI again, it returns to normal.

 

is this a known thing that happens?

is there a workaround?

 

here is the code:

 

public class EventHandlerClient {


    @SubscribeEvent
    public void onRenderTick(TickEvent.RenderTickEvent event){

                Tessellator tessellator = Tessellator.getInstance();
                VertexBuffer vertexBuffer = tessellator.getBuffer();

                GlStateManager.pushMatrix();
                GlStateManager.disableTexture2D();

                vertexBuffer.begin(7, DefaultVertexFormats.POSITION_COLOR);
                vertexBuffer.pos(0f,100f,0f).color(1f,0f,0f,0.5f).endVertex();
                vertexBuffer.pos(100f,100f,0f).color(1f,0f,0f,0.5f).endVertex();
                vertexBuffer.pos(100f,0f,0f).color(1f,0f,0f,0.5f).endVertex();
                vertexBuffer.pos(0f,0f,0f).color(1f,0f,0f,0.5f).endVertex();
                tessellator.draw();

                GlStateManager.enableTexture2D();
                GlStateManager.popMatrix();

    }
}

TickEvent.RenderTickEvent has sub events, IIRC. You want to use one of them, not all of them.

Thanks for the advice but I am aware of it.

This is just the most minimal example of the problem, I didn't want to add any unnecessary code to my example.