texm3x3 (Pixel Shader)

Performs a 3x3 matrix multiply when used in conjunction with two texm3x3pad instructions.

Syntax

texm3x3 (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
texm3x3		x	x

This instruction is the same as the texm3x3tex instruction, without the texture lookup.

This instruction is used as the final of three instructions representing a 3x3 matrix multiply operation. The 3x3 matrix is comprised of the texture coordinates of the third texture stage, and by the two preceding texture stages. Any texture assigned to any of the three texture stages is ignored.

This instruction must be used with two texm3x3pad instructions. Texture registers must follow the following sequence.

 
tex t(n)                 // Define tn as a standard 3-vector (tn must
                         // be defined in some way before it is used).
texm3x3pad t(m),   t(n)  // where m > n
                         // Perform first row of matrix multiply.
texm3x3pad t(m+1), t(n)  // Perform second row of matrix multiply.
texm3x3    t(m+2), t(n)  // Perform third row of matrix multiply to get a
                         // 3-vector result.

Here is more detail about how the 3x3 multiply is accomplished.

The first texm3x3pad instruction performs the first row of the multiply to find u^'.

u' = TextureCoordinates(stage m)UVW * t(n)RGB   

The second texm3x3pad instruction performs the second row of the multiply to find v^'.

v' = TextureCoordinates(stage m+1)UVW * t(n)RGB   

The texm3x3tex instruction performs the third row of the multiply to find w^'.

w' = TextureCoordinates(stage m+2)UVW * t(n)RGB 

Place the result of the matrix multiply in the destination register.

t(m+2)RGBA = (u', v', w', 1)

Instruction Information

Minimum operating systems	Windows 98