bem - ps

  • Article

Apply a fake bump environment-map transform.

Syntax

bem dst.rg, src0, src1

 

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

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

 

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

Requirement Value
Minimum operating system Windows 98

 

Pixel Shader Instructions