Create a rasterized shape

When you create a rasterized shape, you’re drawing and rasterizing a shape and filling it with the foreground color. You cannot edit a rasterized shape as a vector object. Raster shapes are created using the current foreground color.

Select a layer. You cannot create a rasterized shape on a vector-based layer (for example, a type layer).
Select a shape tool, and click the Fill Pixels button in the options bar.
Set the following options in the options bar:
Mode

Controls how the shape will affect the existing pixels in the image. (See List of blending modes.)
Opacity

Determines to what degree the shape will obscure or reveal the pixels beneath it. A shape with 1% opacity appears nearly transparent, while one with 100% opacity appears completely opaque.
Anti-Aliased

Smooths and blends the edge pixels with the surrounding pixels.
Set additional tool-specific options. See Shape tool options.
Draw the shape.