defb (Vertex Shader)
Defines a Boolean constant value, which should be loaded anytime a shader is set to a device.
Syntax
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 |
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The defb (Vertex Shader) 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 application programming interface (API) method SetVertexShaderConstantB.
There are two ways to set a boolean constant in a shader.
- Use defb (Vertex Shader) to define the constant directly inside a shader.
- Use the API methods to set a constant.
Instruction Information
| Minimum operating system | Windows 98 |
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