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defb - vs

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Defines a Boolean constant value, which should be loaded anytime a shader is set to a device.

Syntax

defb dest, booleanValue

 

where

  • dst is the destination register.
  • booleanValue is a boolean value, either True or False.

Remarks

Vertex shader versions 1_1 2_0 2_x 2_sw 3_0 3_sw
defb x x x x x

 

The defb - vs 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 SetVertexShaderConstantB.

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

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

Vertex Shader Instructions

def - vs

defi - vs