GPUImage + Core Image

GPUImageTextureInput+CIImage.h

//
//  GPUImageTextureInput+CIImage.h
//  GPUImage
//
//  Created by Sam Soffes on 3/4/14.
//  Copyright (c) 2014 Sam Soffes. All rights reserved.
//

#import "GPUImageTextureInput.h"

@class CIImage;

@interface GPUImageTextureInput (CIImage)

+ (instancetype)textureInputWithCIImage:(CIImage *)ciImage;

@end

GPUImageTextureInput+CIImage.m

//
//  GPUImageTextureInput+CIImage.m
//  GPUImage
//
//  Created by Sam Soffes on 3/4/14.
//  Copyright (c) 2014 Sam Soffes. All rights reserved.
//

#import "GPUImageTextureInput+CIImage.h"

#import <CoreImage/CoreImage.h>

@implementation GPUImageTextureInput (CIImage)

+ (instancetype)textureInputWithCIImage:(CIImage *)ciImage {
	EAGLSharegroup *sharegroup = [[[GPUImageContext sharedImageProcessingContext] context] sharegroup];
	EAGLContext *context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2 sharegroup:sharegroup];
	[EAGLContext setCurrentContext:context];

	GLsizei backingWidth = ciImage.extent.size.width;
	GLsizei backingHeight = ciImage.extent.size.height;
	GLuint outputTexture, defaultFramebuffer;

	glActiveTexture(GL_TEXTURE0);
	glGenTextures(1, &outputTexture);
	glBindTexture(GL_TEXTURE_2D, outputTexture);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	glBindTexture(GL_TEXTURE_2D, 0);

	glActiveTexture(GL_TEXTURE1);
	glGenFramebuffers(1, &defaultFramebuffer);
	glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);

	glBindTexture(GL_TEXTURE_2D, outputTexture);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, backingWidth, backingHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, outputTexture, 0);

	NSAssert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE, @"Incomplete filter FBO: %d", glCheckFramebufferStatus(GL_FRAMEBUFFER));

	glBindTexture(GL_TEXTURE_2D, 0);

	ciImage = [ciImage imageByApplyingTransform:CGAffineTransformConcat(CGAffineTransformMakeScale(1.0f, -1.0f), CGAffineTransformMakeTranslation(0.0f, ciImage.extent.size.height))];

	CIContext *ciContext = [CIContext contextWithEAGLContext:context options:@{kCIContextWorkingColorSpace: [NSNull null]}];
	[ciContext drawImage:ciImage inRect:ciImage.extent fromRect:ciImage.extent];

	return [[GPUImageTextureInput alloc] initWithTexture:outputTexture size:ciImage.extent.size];
}

@end

GPUImageTextureOutput+CIImage.h

//
//  GPUImageTextureOutput+CIImage.h
//  GPUImage
//
//  Created by Sam Soffes on 3/4/14.
//  Copyright (c) 2014 Sam Soffes. All rights reserved.
//

#import "GPUImageTextureOutput.h"

@class CIImage;

@interface GPUImageTextureOutput (CIImage)

- (CIImage *)CIImageWithSize:(CGSize)size;

@end

GPUImageTextureOutput+CIImage.m

//
//  GPUImageTextureOutput+CIImage.m
//  GPUImage
//
//  Created by Sam Soffes on 3/4/14.
//  Copyright (c) 2014 Sam Soffes. All rights reserved.
//

#import "GPUImageTextureOutput+CIImage.h"

#import <CoreImage/CoreImage.h>

@implementation GPUImageTextureOutput (CIImage)

- (CIImage *)CIImageWithSize:(CGSize)size {
	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
	CIImage *image = [[CIImage alloc] initWithTexture:self.texture size:size flipped:YES colorSpace:colorSpace];
	CGColorSpaceRelease(colorSpace);

	return image;
}

@end