Shaders
Shaders are tiny programs executed on gpu before rendering final image to the screen. Shader program is divided into two parts - fragment and vertex. Fragment shader can manipulate only RGBA values of each pixel from the input image, while vertex is used to manipulate coordinates both in 2D and 3D world. In Simplex, shaders are written in HLSL - a high level shader programming language, lowest supported version is DX9, highest DX12.