[DirectX 8.1 C/C++ Programmer's Reference] texdepth (100%)

DirectX 8.1 (C++) > DirectX Graphics > Reference > Pixel Shader Reference > Instructions

[DirectX October 2006 Documentation] texdepth - ps (52.270979020979%)

DirectX Graphics > Direct3D 9 > Reference > Asm Shader Reference > Pixel Shaders > Pixel Shader Instructions