dp2add - ps
Performs a 2D dot product and a scalar addition.
Syntax
dp2add dst, src0, src1, src2.{x|y|z|w}
Where:
- dst is a destination register.
- src0, src1, and src2 are three source registers.
- {x|y|z|w} is the required replicate swizzle on src2.
Remarks
| 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
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