fma — perform a fused multiply-add operation
| ||genType a,|
|genType c |
| ||genDType a,|
|genDType c |
Specifies the first multiplicand.
Specifies the second multiplicand.
Specifies the value to be added to the result.
fma performs, where possible, a fused multiply-add operation, returning
a * b + c. In use cases where the return value is eventually consumed by a variable declared as
fma() is considered a single operation, whereas the expression
a * b + c consumed by a variable declared as
precise is considered two operations.
The precision of
fma() can differ from the precision of the expression
a * b + c.
fma() will be computed with the same precision as any other
fma() consumed by a
precise variable, giving invariant results for the same input values of
Otherwise, in the absense of
precise consumption, there are no special constraints on the number of operations or difference in precision between
fma() and the expression
a * b + c.
|OpenGL Shading Language Version|
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