GL11.glDisable(GL11.GL_TEXTURE_2D);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glColor4f(r, g, b, a);
tessellator.startDrawingQuads();
tessellator.addVertex(xMin, yMax, 0.0D);
tessellator.addVertex(xMax, yMax, 0.0D);
tessellator.addVertex(xMax, yMin, 0.0D);
tessellator.addVertex(xMin, yMin, 0.0D);
tessellator.draw();
GL11.glEnable(GL11.GL_TEXTURE_2D);
GL11.glDisable(GL11.GL_BLEND);