Pixel shaders are programs that run on the graphics card and are responsible for determining the color of each pixel in a 3D scene. They are written in a shading language, which is a specialized programming language designed for this purpose. Checking your pixel shader is essential for ensuring that it is working correctly and producing the desired results.
There are a few different ways to check your pixel shader. One way is to use a graphics debugger, which is a software tool that allows you to inspect the state of the graphics pipeline and view the output of your shaders. Another way is to use a shader viewer, which is a tool that allows you to load and view shaders and see how they will render a given scene.