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Performs a 2D dot product and a scalar addition.
dp2add dst, src0, src1, src2.{x|y|z|w}
Where:
| Pixel shader versions | 1_1 | 1_2 | 1_3 | 1_4 | 2_0 | 2_x | 2_sw | 3_0 | 3_sw |
|---|---|---|---|---|---|---|---|---|---|
| dp2add | x | x | x | x | x |
The scalar value for add is chosen by the replicate swizzle on src2.
The following code snippet shows the operations performed.
dest = src0.r * src1.r + src0.g * src1.g + src2.replicate_swizzle // The scalar result is replicated to the write mask components