ios – 我想用GPUImage制作一个以上的输入纹理滤镜.但我得到了黑色输出

概述我想创建一个像GPU Image的GPU ImageTwoInputFilter这样的新过滤器. 这是我的代码.一个名为IFFourInputFilter的基类,很可能是GPUImageTwoInputFilter. #import "IFFourInputFilter.h"NSString *const kIFFourInputTextureVertexShaderString = SHAD 我想创建一个像GPU Image的GPU ImageTwoinputFilter这样的新过滤器.

这是我的代码.一个名为IFFourinputFilter的基类,很可能是GPUImageTwoinputFilter.

#import "IFFourinputFilter.h"Nsstring *const kIFFourinputTextureVertexShaderString = SHADER_STRING( attribute vec4 position; attribute vec4 inputTextureCoordinate; attribute vec4 inputTextureCoordinate2; attribute vec4 inputTextureCoordinate3; attribute vec4 inputTextureCoordinate4; varying vec2 textureCoordinate; varying vec2 textureCoordinate2; varying vec2 textureCoordinate3; varying vec2 textureCoordinate4; voID main() {     gl_position = position;     textureCoordinate = inputTextureCoordinate.xy;     textureCoordinate2 = inputTextureCoordinate2.xy;     textureCoordinate3 = inputTextureCoordinate3.xy;     textureCoordinate4 = inputTextureCoordinate4.xy; });@implementation IFFourinputFilter#pragma mark -#pragma mark Initialization and teardown- (ID)initWithFragmentShaderFromString:(Nsstring *)fragmentShaderString;{    if (!(self = [self initWithVertexShaderFromString:kIFFourinputTextureVertexShaderString fragmentShaderFromString:fragmentShaderString]))    {        return nil;    }    return self;}- (ID)initWithVertexShaderFromString:(Nsstring *)vertexShaderString fragmentShaderFromString:(Nsstring *)fragmentShaderString;{    if (!(self = [super initWithVertexShaderFromString:vertexShaderString fragmentShaderFromString:fragmentShaderString]))    {        return nil;    }    inputRotation2 = kGPUImagenorotation;    inputRotation3 = kGPUImagenorotation;    inputRotation4 = kGPUImagenorotation;    hasSetTexture1 = NO;    hasSetTexture2 = NO;    hasSetTexture3 = NO;    hasReceivedFrame1 = NO;    hasReceivedFrame2 = NO;    hasReceivedFrame3 = NO;    hasReceivedFrame4 = NO;    frameWasVIDeo1 = NO;    frameWasVIDeo2 = NO;    frameWasVIDeo3 = NO;    frameWasVIDeo4 = NO;    frameCheckDisabled1 = NO;    frameCheckDisabled2 = NO;    frameCheckDisabled3 = NO;    frameCheckDisabled4 = NO;    frameTime1 = kCMTimeInvalID;    frameTime2 = kCMTimeInvalID;    frameTime3 = kCMTimeInvalID;    frameTime4 = kCMTimeInvalID;    runSynchronouslyOnVIDeoProcessingQueue(^{        [GPUImageOpenGLESContext useImageProcessingContext];        filterTextureCoordinateAttribute2 = [filterProgram attributeIndex:@"inputTextureCoordinate2"];        filterinputTextureUniform2 = [filterProgram uniformIndex:@"inputimageTexture2"]; // This does assume a name of "inputimageTexture2" for second input texture in the fragment shader        glEnabLevertexAttribarray(filterTextureCoordinateAttribute2);        filterTextureCoordinateAttribute3 = [filterProgram attributeIndex:@"inputTextureCoordinate3"];        filterinputTextureUniform3 = [filterProgram uniformIndex:@"inputimageTexture3"]; // This does assume a name of "inputimageTexture2" for second input texture in the fragment shader        glEnabLevertexAttribarray(filterTextureCoordinateAttribute3);        filterTextureCoordinateAttribute4 = [filterProgram attributeIndex:@"inputTextureCoordinate4"];        filterinputTextureUniform4 = [filterProgram uniformIndex:@"inputimageTexture4"]; // This does assume a name of "inputimageTexture2" for second input texture in the fragment shader        glEnabLevertexAttribarray(filterTextureCoordinateAttribute4);    });    return self;}- (voID)initializeAttributes;{    [super initializeAttributes];    [filterProgram addAttribute:@"inputTextureCoordinate2"];    [filterProgram addAttribute:@"inputTextureCoordinate3"];    [filterProgram addAttribute:@"inputTextureCoordinate4"];}- (voID)disableFrameCheck1;{    frameCheckDisabled1 = YES;}- (voID)disableFrameCheck2;{    frameCheckDisabled2 = YES;}- (voID)disableFrameCheck3;{    frameCheckDisabled3 = YES;}- (voID)disableFrameCheck4;{    frameCheckDisabled4 = YES;}#pragma mark -#pragma mark Rendering- (voID)renderToTextureWithVertices:(const GLfloat *)vertices textureCoordinates:(const GLfloat *)textureCoordinates sourceTexture:(gluint)sourceTexture;{    if (self.preventRendering)    {        return;    }    [GPUImageOpenGLESContext setActiveShaderProgram:filterProgram];    [self setUniformsForProgramAtIndex:0];    [self setFilterFBO];    glClearcolor(backgroundcolorRed,backgroundcolorGreen,backgroundcolorBlue,backgroundcolorAlpha);    glClear(GL_color_BUFFER_BIT);    glActiveTexture(GL_TEXTURE2);    glBindTexture(GL_TEXTURE_2D,sourceTexture);    gluniform1i(filterinputTextureUniform,2);    glActiveTexture(GL_TEXTURE3);    glBindTexture(GL_TEXTURE_2D,filterSourceTexture2);    gluniform1i(filterinputTextureUniform2,3);    glActiveTexture(GL_TEXTURE4);    glBindTexture(GL_TEXTURE_2D,filterSourceTexture3);    gluniform1i(filterinputTextureUniform3,4);    glActiveTexture(GL_TEXTURE5);    glBindTexture(GL_TEXTURE_2D,filterSourceTexture4);    gluniform1i(filterinputTextureUniform4,5);    glVertexAttribPointer(filterpositionAttribute,2,GL_float,vertices);    glVertexAttribPointer(filterTextureCoordinateAttribute,textureCoordinates);    glVertexAttribPointer(filterTextureCoordinateAttribute2,[[self class] textureCoordinatesForRotation:inputRotation2]);    glVertexAttribPointer(filterTextureCoordinateAttribute3,[[self class] textureCoordinatesForRotation:inputRotation3]);    glVertexAttribPointer(filterTextureCoordinateAttribute4,[[self class] textureCoordinatesForRotation:inputRotation4]);    glDrawArrays(GL_TRIANGLE_STRIP,4);}- (voID)releaseinputTexturesIfNeeded;{    if (shouldConserveMemoryForNextFrame)    {        [firstTextureDelegate textureNolongerNeededForTarget:self];        [textureDelegate2 textureNolongerNeededForTarget:self];        [textureDelegate3 textureNolongerNeededForTarget:self];        [textureDelegate4 textureNolongerNeededForTarget:self];        shouldConserveMemoryForNextFrame = NO;    }}#pragma mark -#pragma mark GPUImageinput- (NSInteger)nextAvailableTextureIndex;{    if (!hasSetTexture1){        return 0;    }else if (!hasSetTexture2) {        return 1;    }else if (!hasSetTexture3) {        return 2;    }else{        return 3;    }}- (voID)setinputTexture:(gluint)newinputTexture atIndex:(NSInteger)textureIndex;{    switch (textureIndex) {        case 0:            filterSourceTexture = newinputTexture;            hasSetTexture1 = YES;            break;        case 1:            filterSourceTexture2 = newinputTexture;            hasSetTexture2 = YES;            break;        case 2:            filterSourceTexture3 = newinputTexture;            hasSetTexture3 = YES;            break;        case 3:            filterSourceTexture4 = newinputTexture;            break;        default:            break;    }}- (voID)setinputSize:(CGSize)newSize atIndex:(NSInteger)textureIndex;{    if (textureIndex == 0)    {        [super setinputSize:newSize atIndex:textureIndex];        if (CGSizeEqualToSize(newSize,CGSizeZero))        {            hasSetTexture1 = NO;        }    }}- (voID)setinputRotation:(GPUImageRotationMode)newinputRotation atIndex:(NSInteger)textureIndex;{    switch (textureIndex) {        case 0:            inputRotation = newinputRotation;            break;        case 1:            inputRotation2 = newinputRotation;            break;        case 2:            inputRotation3 = newinputRotation;            break;        case 3:            inputRotation4 = newinputRotation;            break;        default:            break;    }}- (CGSize)rotatedSize:(CGSize)sizetoRotate forIndex:(NSInteger)textureIndex;{    CGSize rotatedSize = sizetoRotate;    GPUImageRotationMode rotationtocheck;    switch (textureIndex) {        case 0:            rotationtocheck = inputRotation;            break;        case 1:            rotationtocheck = inputRotation2;            break;        case 2:            rotationtocheck = inputRotation3;            break;        case 3:            rotationtocheck = inputRotation4;            break;        default:            break;    }    if (GPUImageRotationSwapsWIDthAndHeight(rotationtocheck))    {        rotatedSize.wIDth = sizetoRotate.height;        rotatedSize.height = sizetoRotate.wIDth;    }    return rotatedSize;}- (voID)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;{    outputTextureRetainCount = [targets count];    // You can set up infinite update loops,so this helps to short circuit them    if (hasReceivedFrame1 && hasReceivedFrame2 && hasReceivedFrame3 && hasReceivedFrame4)    {        return;    }    BOol updatedMovIEFrameOppositeStillimage = NO;    switch (textureIndex) {        case 0:            hasReceivedFrame1 = YES;            frameTime1 = frameTime;            if (frameCheckDisabled2)            {                hasReceivedFrame2 = YES;            }            if (frameCheckDisabled3)            {                hasReceivedFrame3 = YES;            }            if (frameCheckDisabled4)            {                hasReceivedFrame4 = YES;            }            if (!CMTIME_IS_INDEFINITE(frameTime))            {                if (CMTIME_IS_INDEFINITE(frameTime2) && CMTIME_IS_INDEFINITE(frameTime3) && CMTIME_IS_INDEFINITE(frameTime4))                {                    updatedMovIEFrameOppositeStillimage = YES;                }            }            break;        case 1:            hasReceivedFrame2 = YES;            frameTime2 = frameTime;            if (frameCheckDisabled1)            {                hasReceivedFrame1 = YES;            }            if (frameCheckDisabled3)            {                hasReceivedFrame3 = YES;            }            if (frameCheckDisabled4)            {                hasReceivedFrame4 = YES;            }            if (!CMTIME_IS_INDEFINITE(frameTime))            {                if (CMTIME_IS_INDEFINITE(frameTime1) && CMTIME_IS_INDEFINITE(frameTime3) && CMTIME_IS_INDEFINITE(frameTime4))                {                    updatedMovIEFrameOppositeStillimage = YES;                }            }            break;        case 2:            hasReceivedFrame3 = YES;            frameTime3 = frameTime;            if (frameCheckDisabled1)            {                hasReceivedFrame1 = YES;            }            if (frameCheckDisabled2)            {                hasReceivedFrame2 = YES;            }            if (frameCheckDisabled4)            {                hasReceivedFrame4 = YES;            }            if (!CMTIME_IS_INDEFINITE(frameTime))            {                if (CMTIME_IS_INDEFINITE(frameTime1) && CMTIME_IS_INDEFINITE(frameTime2) && CMTIME_IS_INDEFINITE(frameTime4))                {                    updatedMovIEFrameOppositeStillimage = YES;                }            }            break;        case 3:            hasReceivedFrame4 = YES;            frameTime4 = frameTime;            if (frameCheckDisabled1)            {                hasReceivedFrame1 = YES;            }            if (frameCheckDisabled3)            {                hasReceivedFrame3 = YES;            }            if (frameCheckDisabled2)            {                hasReceivedFrame2 = YES;            }            if (!CMTIME_IS_INDEFINITE(frameTime))            {                if (CMTIME_IS_INDEFINITE(frameTime1) && CMTIME_IS_INDEFINITE(frameTime3) && CMTIME_IS_INDEFINITE(frameTime2))                {                    updatedMovIEFrameOppositeStillimage = YES;                }            }            break;        default:            break;    }    // || (hasReceivedFirstFrame && secondFrameCheckDisabled) || (hasReceivedSecondFrame && firstFrameCheckDisabled)    if ((hasReceivedFrame1 && hasReceivedFrame2 && hasReceivedFrame3 && hasReceivedFrame4) || updatedMovIEFrameOppositeStillimage)    {        [super newFrameReadyAtTime:frameTime atIndex:0];        hasReceivedFrame1 = NO;        hasReceivedFrame2 = NO;        hasReceivedFrame3 = NO;        hasReceivedFrame4 = NO;    }}- (voID)setTextureDelegate:(ID<GPUImageTextureDelegate>)newTextureDelegate atIndex:(NSInteger)textureIndex;{    switch (textureIndex) {        case 0:            firstTextureDelegate = newTextureDelegate;            break;        case 1:            textureDelegate2 = newTextureDelegate;            break;        case 2:            textureDelegate3 = newTextureDelegate;            break;        case 3:            textureDelegate4 = newTextureDelegate;            break;        default:            break;    }}@end

名为IFAmaroFilter的类扩展了IFFourinputFilter.

#import "IFAmaroFilter.h"Nsstring *const kIFAmaroFilterFragmentShaderString = SHADER_STRING( precision lowp float; varying highp vec2 textureCoordinate; uniform sampler2D inputimageTexture; uniform sampler2D inputimageTexture2; //blowout; uniform sampler2D inputimageTexture3; //overlay; uniform sampler2D inputimageTexture4; //map voID main() {     vec4 texel = texture2D(inputimageTexture,textureCoordinate);     vec3 bbTexel = texture2D(inputimageTexture2,textureCoordinate).rgb;     texel.r = texture2D(inputimageTexture3,vec2(bbTexel.r,texel.r)).r;     texel.g = texture2D(inputimageTexture3,vec2(bbTexel.g,texel.g)).g;     texel.b = texture2D(inputimageTexture3,vec2(bbTexel.b,texel.b)).b;     vec4 mapped;     mapped.r = texture2D(inputimageTexture4,vec2(texel.r,0.16666)).r;     mapped.g = texture2D(inputimageTexture4,vec2(texel.g,.5)).g;     mapped.b = texture2D(inputimageTexture4,vec2(texel.b,.83333)).b;     mapped.a = 1.0;     gl_Fragcolor = texel; } );@implementation IFAmaroFilter- (ID)init;{    if (!(self = [super initWithFragmentShaderFromString:kIFAmaroFilterFragmentShaderString]))    {        return nil;    }    return self;}@end

当我使用滤镜时,我得到了黑色输出.代码如下：

filter = [[IFAmaroFilter alloc] init];    GPUImagePicture *gp1 = [[GPUImagePicture alloc] initWithImage:[UIImage imageWithContentsOffile:[[NSBundle mainBundle] pathForResource:@"blackboard1024" ofType:@"png"]]];    GPUImagePicture *gp2 = [[GPUImagePicture alloc] initWithImage:[UIImage imageWithContentsOffile:[[NSBundle mainBundle] pathForResource:@"overlayMap" ofType:@"png"]]];    GPUImagePicture *gp3 = [[GPUImagePicture alloc] initWithImage:[UIImage imageWithContentsOffile:[[NSBundle mainBundle] pathForResource:@"amaroMap" ofType:@"png"]]];    [stillCamera addTarget:filter atTextureLocation:0];    [gp1 addTarget:filter atTextureLocation:1];    [gp1 processImage];    [gp2 addTarget:filter atTextureLocation:2];    [gp2 processImage];    [gp3 addTarget:filter atTextureLocation:3];    [gp3 processImage];    [filter addTarget:(GPUImageVIEw *)self.vIEw];

解决方法 我发现GPUImagePicture会自动释放,因此过滤器不会接收纹理. 如果您遇到同样的问题,请仔细检查纹理的生命控制,观察它们何时被取消. 总结

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