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crs - vs

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Computes a cross product using the right-hand rule.

Syntax

crs dst, src0, src1

 

where

  • dst is the destination register.
  • src0 is a source register.
  • src1 is a source register.

Remarks

Vertex shader versions 1_1 2_0 2_x 2_sw 3_0 3_sw
crs x x x x x

 

This instruction works as shown here.

dest.x = src0.y * src1.z - src0.z * src1.y;
dest.y = src0.z * src1.x - src0.x * src1.z;
dest.z = src0.x * src1.y - src0.y * src1.x;

Some restrictions on use:

  • src0 cannot be the same register as dest.
  • src1 cannot be the same register as dest.
  • src0 cannot have any swizzle other than the default swizzle (.xyzw).
  • src1 cannot have any swizzle other than the default swizzle (.xyzw).
  • dest has to have exactly one of the following seven masks: .x | .y | .z | .xy | .xz | .yz | .xyz.
  • dest must be a temporary register.
  • dest must not be the same register as src0 or src1

Vertex Shader Instructions