defb - ps

Defines a boolean constant value, which should be loaded any time a shader is set to a device.


defb dest, booleanValue



  • dst is the destination register.
  • booleanValue is a single boolean value, either true or false.


Pixel shader versions1_11_21_31_42_02_x2_sw3_03_sw


The defb instruction defines a boolean 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 the API method SetPixelShaderConstantB.

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

  1. Use defb to define the constant directly inside a shader.
  2. Use the API methods to set a constant.

Related topics

Pixel Shader Instructions
def - ps
defi - ps