title | description | ms.assetid | keywords | topic_type | api_name | api_type | ms.topic | ms.date | api_location | ||||
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ddy |
Returns the partial derivative of the specified value with respect to the screen-space y-coordinate. |
1c88804f-a13f-4714-a3ef-466307afbc1b |
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reference |
05/31/2018 |
Returns the partial derivative of the specified value with respect to the screen-space y-coordinate.
ret ddy(x) |
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This function computes the partial derivative with respect to the screen-space y-coordinate. To compute the partial derivative with respect to the screen-space x-coordinate, use the ddx function.
This function is only supported in pixel shaders.
Item | Description |
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x |
[in] The specified value. |
The partial derivative of the x parameter.
Name | Template Type | Component Type | Size |
---|---|---|---|
x | scalar, vector, or matrix | float | any |
ret | same as input x | float | same dimension(s) as input x |
This function is supported in the following shader models.
Shader Model | Supported |
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Shader Model 5 and higher shader models | yes |
Shader Model 4 | yes |
Shader Model 3 (DirectX HLSL) | yes |
Shader Model 2 (DirectX HLSL) | yes in ps_2_x; unsupported in ps_2_0. |
Shader Model 1 (DirectX HLSL) | no |
This function is supported in the following types of shaders:
Vertex | Hull | Domain | Geometry | Pixel | Compute |
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x |