texreg2ar (Pixel Shader)

Interprets the alpha and red color components of the source register as texture address data (u,v) to sample the texture at the stage corresponding to the destination register number. The result is stored in the destination register.

Syntax

texreg2ar (Pixel Shader) dest, src

Registers

dest

Destination register.

src

Input source register.

Remarks

Pixel shader versions	1_1	1_2	1_3	1_4	2_0	2_x	2_sw	3_0	3_sw
texreg2ar	x	x	x

This instruction is useful for color-space remapping operations.

Here is an example of the sequence the instruction follows.

tex t(n)
texreg2ar t(m), t(n)     where m > n

// Here is more detail about how the remapping is accomplished.
// The first instruction loads the texture color (RGBA) 
// into register tn.
tex tn 
// The second instruction remaps the color.
t(m)RGBA = TextureSample(stage m)RGBA using t(n)AR as coordinates.

_bx2 cannot be used on the src register for texreg2ar (Pixel Shader) or texreg2gb instructions.

For this instruction, the source register must use unsigned data. Use of signed or mixed data in the source register will produce undefined results. For more information, see D3DFORMAT.

Instruction Information

Minimum operating systems	Windows 98