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Computes the rate of change of components.
| deriv_rtx_fine[_sat] dest[.mask], [-]src0[_abs][.swizzle], |
|---|
| Item | Description |
|---|---|
| dest |
[in] The address of the results of the operation. |
| src0 |
[in] The components in the operation. |
Remarks
This instruction computes the rate of change of contents of each float32 component of src0 (post-swizzle), with regard to RenderTarget x direction (rtx) or RenderTarget y direction (see deriv_rty_fine). Each pixel in the 2x2 stamp gets a unique pair of x/y derivative calculations
The data in the current pixel shader invocation always participates in the calculation of the requested derivative. In the 2x2 pixel quad the current pixel falls within, the x derivative is the delta of the row of 2 pixels including the current pixel. The y derivative is the delta of the column of 2 pixels including the current pixel. There is no specification dictating how the 2x2 quads will be aligned or tiled over a primitive.
Derivatives are calculated at a fine level (unique calculation of the x/y derivative pair for each pixel in a 2x2 quad). This instruction and deriv_rty_fine are alternatives to deriv_rtx_coarse and deriv_rty_coarse. These _coarse and _fine derivative instructions are a replacement for deriv_rtx These _coarse and _fine derivative instructions are a replacement for deriv_rtx and deriv_rty from previous shader models.
This instruction applies to the following shader stages:
| Vertex | Hull | Domain | Geometry | Pixel | Compute |
|---|---|---|---|---|---|
| X |
Minimum Shader Model
This instruction is supported in the following shader models:
| Shader Model | Supported |
|---|---|
| Shader Model 5 | yes |
| Shader Model 4.1 | no |
| Shader Model 4 | no |
| Shader Model 3 (DirectX HLSL) | no |
| Shader Model 2 (DirectX HLSL) | no |
| Shader Model 1 (DirectX HLSL) | no |