FidelityFX LPM
FidelityFX Luma Preserving Mapper GPU documentation.
Functions
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Return type |
Description |
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FFX_STATIC void |
FfxCalculateLpmConsts ( FfxBoolean shoulder, FfxBoolean con, FfxBoolean soft, FfxBoolean con2, FfxBoolean clip, FfxBoolean scaleOnly, FfxFloat32x2 xyRedW, FfxFloat32x2 xyGreenW, FfxFloat32x2 xyBlueW, FfxFloat32x2 xyWhiteW, FfxFloat32x2 xyRedO, FfxFloat32x2 xyGreenO, FfxFloat32x2 xyBlueO, FfxFloat32x2 xyWhiteO, FfxFloat32x2 xyRedC, FfxFloat32x2 xyGreenC, FfxFloat32x2 xyBlueC, FfxFloat32x2 xyWhiteC, FfxFloat32 scaleC, FfxFloat32 softGap, FfxFloat32 hdrMax, FfxFloat32 exposure, FfxFloat32 contrast, FfxFloat32 shoulderContrast, FfxFloat32x3 saturation, FfxFloat32x3 crosstalk )
Setup required constant values for LPM (works on CPU or GPU). Output goes to the user-defined LpmSetupOut() function.
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Detailed description
FidelityFX Luma Preserving Mapper GPU documentation.
Global functions
FfxCalculateLpmConsts
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FFX_STATIC void FfxCalculateLpmConsts (
FfxBoolean shoulder,
FfxBoolean con,
FfxBoolean soft,
FfxBoolean con2,
FfxBoolean clip,
FfxBoolean scaleOnly,
FfxFloat32x2 xyRedW,
FfxFloat32x2 xyGreenW,
FfxFloat32x2 xyBlueW,
FfxFloat32x2 xyWhiteW,
FfxFloat32x2 xyRedO,
FfxFloat32x2 xyGreenO,
FfxFloat32x2 xyBlueO,
FfxFloat32x2 xyWhiteO,
FfxFloat32x2 xyRedC,
FfxFloat32x2 xyGreenC,
FfxFloat32x2 xyBlueC,
FfxFloat32x2 xyWhiteC,
FfxFloat32 scaleC,
FfxFloat32 softGap,
FfxFloat32 hdrMax,
FfxFloat32 exposure,
FfxFloat32 contrast,
FfxFloat32 shoulderContrast,
FfxFloat32x3 saturation,
FfxFloat32x3 crosstalk
)Setup required constant values for LPM (works on CPU or GPU). Output goes to the user-defined LpmSetupOut() function.
Parameters:
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shoulder |
Use optional extra shoulderContrast tuning (set to false if shoulderContrast is 1.0). |
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con |
Use first RGB conversion matrix, if ‘soft’ then ‘con’ must be true also. |
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soft |
Use soft gamut mapping. |
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con2 |
Use last RGB conversion matrix. |
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clip |
Use clipping in last conversion matrix. |
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scaleOnly |
Scale only for last conversion matrix (used for 709 HDR to scRGB). |
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xyRedW |
Red Chroma coordinates for working color space. |
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xyGreenW |
Green Chroma coordinates for working color space. |
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xyBlueW |
Blue Chroma coordinates for working color space. |
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xyWhiteW |
White Chroma coordinates for working color space. |
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xyRedO |
Red Chroma coordinates for output color space. |
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xyGreenO |
Green Chroma coordinates for output color space. |
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xyBlueO |
Blue Chroma coordinates for output color space. |
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xyWhiteO |
White Chroma coordinates for output color space. |
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xyRedC |
Red Chroma coordinates for output container or display colour space. |
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xyGreenC |
Green Chroma coordinates for output container or display color space. |
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xyBlueC |
Blue Chroma coordinates for output container or display color space. |
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xyWhiteC |
White Chroma coordinates for output container or display color space. |
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scaleC |
scale factor for PQ or scRGB adjustment |
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softGap |
Range of 0 to a little over zero, controls how much feather region in out-of-gamut mapping, 0=clip. |
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hdrMax |
Maximum input value. |
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exposure |
Number of stops between ‘hdrMax’ and 18% mid-level on input. |
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contrast |
Input range {0.0 (no extra contrast) to 1.0 (maximum contrast)}. |
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shoulderContrast |
Shoulder shaping, 1.0 = no change (fast path). |
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saturation |
A per channel adjustment, use <0 decrease, 0=no change, >0 increase. |
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crosstalk |
One channel must be 1.0, the rest can be <= 1.0 but not zero. Lenghtnes colours path to white by walking across gamut. Check documentation for usage |
