texldd - ps

Samples a texture with additional gradient inputs.

Syntax

texldd, dst, src0, src1, src2, src3

Where:

dst is a destination register.
src0 is a source register that provides the texture coordinates for the texture sample. See Texture Coordinate Register.
src1 identifies the source sampler register (s#), where # specifies which texture sampler number to sample. The sampler has associated with it a texture and a control state defined by the D3DSAMPLERSTATETYPE enumeration (ex. D3DSAMP_MINFILTER).
src2 is an input source register that specifies the x gradient.
src3 is an input source register that specifies the y gradient.

Remarks

Pixel shader versions	1_1	1_2	1_3	1_4	2_0	2_x	2_sw	3_0	3_sw
texldd						x *	x	x	x

* This instruction is only supported by ps_2_a. It is not supported by ps_2_b. For more information about profiles, see D3DXGetPixelShaderProfile.

This instruction samples a texture using the texture coordinates at src0, the sampler specified by src1, and the gradients DSX and DSY coming from src2 and src3. The x and y gradient values are used to select the appropriate mipmap level of the texture for sampling.

All sources support arbitrary swizzles.

All write masks are valid on the destination.