def (Vertex Shader)

Defines vertex shader constants.

Syntax

where

• dst is the destination register.
• value is either a 4-D floating point number.

Remarks

The def instruction defines a shader constant whose value is loaded anytime a shader is set to a device. These are called immediate constants. Immediate constants take precedence over constants set by application programming interface (API) methods SetVertexShaderConstantF.

There are two ways to set a constant in a shader.

1. Use def (Vertex Shader) to define the constant directly inside a shader.

   def (Vertex Shader) can only define floating-point constants.

2. Use the API methods to set a constant.
   • Use IDirect3DDevice9::SetVertexShaderConstantF to set a floating-point constant.

Instruction Information

Related Topics

• defi
• defb