Microsoft DirectX 8.1 (pixel shader versions 1.0, 1.1, 1.2, 1.3)

texreg2ar

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.

texreg2ar dest, src

Registers

Argument	Description	Registers				Version
Argument	Description	v_n	c_n	t_n	r_n	Version
dest	Destination register			x		1.0, 1.1, 1.2, 1.3
src	Source register			x		1.0, 1.1, 1.2, 1.3

To learn more about registers, see Registers.

Remarks

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.

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.