I want to make something already done by a lot of games , which is when I am taking so much hits from enemy red screen drawn like the following , using XNA 4.0:
after it's drawn and I am still alive I want to be removed slightly as in the call of duty !!!
Render-to-texture the scene, then make a new shader that combines the rendered image with the blood image (with transparency in the middle).
This is known as a post-process.
To make it fade away, adjust the alpha(opacity) of the image, which is demonstrated in this stack overflow thread:
http://stackoverflow.com/questions/6632723/how-to-make-a-texture2d-50-transparent-xna
