texreg2rgb (Pixel Shader)

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

Syntax

texreg2rgb (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
texreg2rgb		x	x

This instruction is useful for color-space remapping operations. It supports two-dimensional (2-D) and three-dimensional (3-D) coordinates. It can be used just like the texreg2ar or texreg2gb to remap 2-D data. However, this instruction also supports 3-D data so it can be used with cube maps and 3-D volume textures.

Here is an example of the sequence the instruction follows.

 
tex t(n)
texreg2rgb 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)RGB = TextureSample(stage m)RGB using t(n)RGB as coordinates.

Instruction Information

Minimum operating systems	Windows 98