CPU Core
Core CPU-side defines and functions.
Functions
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Return type |
Description |
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static FfxUInt32 |
Interpret the bit layout of an IEEE-754 floating point value as an unsigned integer.
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static FfxFloat32 |
Compute the linear interopation between two values.
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static FfxFloat32 |
Compute the reciprocal of a value.
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static FfxFloat32 |
ffxSqrt (FfxFloat32 x)
Compute the square root of a value.
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static FfxFloat32 |
ffxFract (FfxFloat32 x)
Compute the factional part of a decimal value.
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static FfxFloat32 |
ffxRsqrt (FfxFloat32 x)
Compute the reciprocal square root of a value.
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static FfxFloat32 |
Clamp a value to a [0..1] range.
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static FfxUInt32 |
Convert FfxFloat32 to half (in lower 16-bits of output).
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static FfxUInt32 |
Pack 2×32-bit floating point values in a single 32bit value.
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Detailed description
Core CPU-side defines and functions.
Global functions
ffxAsUInt32
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static FfxUInt32 ffxAsUInt32 (FfxFloat32 x)Interpret the bit layout of an IEEE-754 floating point value as an unsigned integer.
Parameters:
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x |
A 32bit floating value. |
Returns:
An unsigned 32bit integer value containing the bit pattern of x.
ffxLerp
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static FfxFloat32 ffxLerp (FfxFloat32 x, FfxFloat32 y, FfxFloat32 t)Compute the linear interopation between two values.
Implemented by calling the GLSL mix instrinsic function. Implements the following math:
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(1 - t) * x + t * y
Parameters:
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x |
The first value to lerp between. |
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y |
The second value to lerp between. |
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t |
The value to determine how much of |
Returns:
A linearly interpolated value between x and y according to t.
ffxReciprocal
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static FfxFloat32 ffxReciprocal (FfxFloat32 x)Compute the reciprocal of a value.
Parameters:
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x |
The value to compute the reciprocal for. |
Returns:
The reciprocal value of x.
ffxSqrt
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static FfxFloat32 ffxSqrt (FfxFloat32 x)Compute the square root of a value.
Parameters:
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x |
The first value to compute the min of. |
Returns:
The the square root of x.
ffxFract
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static FfxFloat32 ffxFract (FfxFloat32 x)Compute the factional part of a decimal value.
This function calculates x - floor(x).
Parameters:
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x |
The value to compute the fractional part from. |
Returns:
The fractional part of x.
ffxRsqrt
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static FfxFloat32 ffxRsqrt (FfxFloat32 x)Compute the reciprocal square root of a value.
Parameters:
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x |
The value to compute the reciprocal for. |
Returns:
The reciprocal square root value of x.
ffxSaturate
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static FfxFloat32 ffxSaturate (FfxFloat32 x)Clamp a value to a [0..1] range.
Parameters:
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x |
The value to clamp to [0..1] range. |
Returns:
The clamped version of x.
ffxF32ToF16
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static FfxUInt32 ffxF32ToF16 (FfxFloat32 f)Convert FfxFloat32 to half (in lower 16-bits of output).
This function implements the same fast technique that is documented here: ftp://ftp.fox-toolkit.org/pub/fasthalffloatconversion.pdf
The function supports denormals.
Some conversion rules are to make computations possibly “safer” on the GPU, -INF & -NaN -> -65504 +INF & +NaN -> +65504
Parameters:
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f |
The 32bit floating point value to convert. |
Returns:
The closest 16bit floating point value to f.
ffxPackHalf2x16
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static FfxUInt32 ffxPackHalf2x16 (FfxFloat32x2 x)Pack 2×32-bit floating point values in a single 32bit value.
This function first converts each component of value into their nearest 16-bit floating point representation, and then stores the X and Y components in the lower and upper 16 bits of the 32bit unsigned integer respectively.
Parameters:
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x |
A 2-dimensional floating point value to convert and pack. |
Returns:
A packed 32bit value containing 2 16bit floating point values.
