bem (Pixel Shader)

Apply a fake bump environment-map transform.

Syntax

where

• dst.rg dst is the destination register. The red and green component write mask must be used.
• src0 is a source register.
• src1 is a source register.

Remarks

This instruction performs the following calculation.

(Given n == dest register #)
dest.r = src0.r + D3DTSS_BUMPENVMAT00(stage n) * src1.r 
                + D3DTSS_BUMPENVMAT10(stage n) * src1.g

dest.g = src0.g + D3DTSS_BUMPENVMAT01(stage n) * src1.r
                + D3DTSS_BUMPENVMAT11(stage n) * src1.g

Rules for using bem:

1. bem must appear in the first phase of a shader (that is, before a phase marker).
2. bem consumes two arithmetic instruction slots.
3. Only one use of this instruction is allowed per shader.
4. Destination writemask must be .rg /.xy.
5. This instruction cannot be co-issued.
6. Aside from the restriction that destination write mask be .rg, modifiers on source src0, src1, and instruction modifiers are unconstrained.

Instruction Information