MPSCNNArithmetic(3) MetalPerformanceShaders.framework MPSCNNArithmetic(3)
NAME
MPSCNNArithmetic
SYNOPSIS
#import <MPSCNNMath.h>
Inherits MPSCNNBinaryKernel.
Inherited by MPSCNNAdd, MPSCNNDivide, MPSCNNMultiply, and MPSCNNSubtract.
Instance Methods
(nonnull instancetype) - initWithDevice:
Properties
float primaryScale
float secondaryScale
float bias
NSUInteger primaryStrideInFeatureChannels
NSUInteger secondaryStrideInFeatureChannels
float minimumValue
float maximumValue
Additional Inherited Members
Detailed Description
This depends on Metal.framework The MPSCNNArithmetic filter takes two source images, a primary source image and a secondary source image,
and outputs a single destination image. It applies an element-wise arithmetic operator to each pixel in a primary source image and a
corresponding pixel in a secondary source image over a specified region.
The supported arithmetic operators are the following:
o Addition
o Subtraction
o Multiplication
o Division
This filter takes additional parameters: primaryScale, secondaryScale, and bias. The default value for primaryScale and secondaryScale is
1.0f. The default value for bias is 0.0f. This filter applies primaryScale, secondaryScale, and bias to the primary source pixel (x) and
secondary source pixel (y) in the following way:
o Addition: result = ((primaryScale * x) + (secondaryScale * y)) + bias
o Subtraction: result = ((primaryScale * x) - (secondaryScale * y)) + bias
o Multiplicaton: result = ((primaryScale * x) * (secondaryScale * y)) + bias
o Division: result = ((primaryScale * x) / (secondaryScale * y)) + bias
To clamp the result of an arithmetic operation, where result = clamp(result, minimumValue, maximumValue), set the minimumValue and
maximumValue appropriately. The default value of minimumValue is -FLT_MAX. The default value of maximumValue is FLT_MAX.
This filter also takes the following additional parameters:
o primaryStrideInPixelsX, primaryStrideInPixelsY, primaryStrideInFeatureChannels
o secondaryStrideInPixelsX, secondaryStrideInPixelsY, secondaryStrideInFeatureChannels These parameters can be used to control broadcasting
for the data stored in the primary and secondary source images. For example, setting all strides for the primary source image to 0 will
result in the primarySource image being treated as a scalar value. The only supported values are 0 or 1. The default value of these
parameters is 1.
The number of output feature channels remains the same as the number of input feature channels.
You must use one of the sub-classes of MPSImageArithmetic.
Method Documentation
- (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device
Standard init with default properties per filter type
Parameters:
device The device that the filter will be used on. May not be NULL.
Returns:
A pointer to the newly initialized object. This will fail, returning nil if the device is not supported. Devices must be
MTLFeatureSet_iOS_GPUFamily2_v1 or later.
Reimplemented from MPSCNNBinaryKernel.
Reimplemented in MPSCNNAdd, MPSCNNSubtract, MPSCNNMultiply, and MPSCNNDivide.
Property Documentation
- (float) bias [read], [write], [nonatomic], [assign]
- maximumValue [read], [write], [nonatomic], [assign]
maximumValue is used to clamp the result of an arithmetic operation: result = clamp(result, minimumValue, maximumValue). The default value
of maximumValue is FLT_MAX.
- minimumValue [read], [write], [nonatomic], [assign]
minimumValue is to clamp the result of an arithmetic operation: result = clamp(result, minimumValue, maximumValue). The default value of
minimumValue is -FLT_MAX.
- (float) primaryScale [read], [write], [nonatomic], [assign]
- (NSUInteger) primaryStrideInFeatureChannels [read], [write], [nonatomic], [assign]
- (float) secondaryScale [read], [write], [nonatomic], [assign]
- (NSUInteger) secondaryStrideInFeatureChannels [read], [write], [nonatomic], [assign]
Author
Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.
Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSCNNArithmetic(3)