def - vs
Defines vertex shader constants.
Syntax
| def dst, float1, float2, float3, float4 |
|---|
where
- dst is the destination register.
- float1, float2, float3, float4 are four floating point numbers.
Remarks
| Vertex shader versions | 1_1 | 2_0 | 2_x | 2_sw | 3_0 | 3_sw |
|---|---|---|---|---|---|---|
| def | x | x | x | x | x | x |
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 API methods SetVertexShaderConstantF.
There are two ways to set a constant in a shader.
Use def - vs to define the constant directly inside a shader.
def - vs can only define floating-point constants.
Use the API methods to set a constant.
- Use SetVertexShaderConstantF to set a floating-point constant.
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