FDSY

Format: FDSY dest, source.

Phase0: FDSY FT0, S0{.NEG}{.ABS}

Phase1: FDSY FT1, S3{.NEG}{.ABS}-

Phase2: -

Description: Gradient in y direction, one source

D = Pix2 - Pix0

Example:

void main()
{
    vec4 data = texture(texture0, textureCoordinate);
    fragColor = dFdy(data);
}

4    : fdsy ft0, r2
       fdsy ft1, r3
       mov r0, ft0;
       mov r1, ft1;