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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| #import "GPUImageElement.h" | ||
| #import "GPUImageProgram.h" | ||
| #import "GPUImage.h" | ||
| #import <UIKit/UIKit.h> | ||
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| // A GPUImageFilter is a GPUImage that uses an OpenGL program to transform | ||
| // its input image. | ||
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| @interface GPUImageFilter : GPUImage | ||
| { | ||
| NSMutableArray *programs; | ||
| NSMutableArray *outputTextures; | ||
| } | ||
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| // These property names are conventional. If there are multiple program stages, | ||
| // these textures denote the first input and the very last output. | ||
| // More complex filters may use additional input and output textures if | ||
| // desired; they can also ignore the standard input and output textures | ||
| // with no ill effects if they wish. | ||
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| @property (strong, nonatomic) GPUImage *inputTexture; | ||
| @property (strong, nonatomic) GPUImage *outputTexture; | ||
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| // Override to automatically set up a framework for >1 program in series | ||
| + (int) numberOfFilterPrograms; | ||
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| // Convenience methods for subclasses | ||
| @property (readonly, nonatomic) GPUImageProgram *program; | ||
| @property (readonly, nonatomic) GPUImageProgram *programOne; | ||
| @property (readonly, nonatomic) GPUImageProgram *programTwo; | ||
| @property (readonly, nonatomic) GPUImageProgram *programThree; | ||
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| // If you are not using the standard inputTexture, you'll want to override | ||
| // render in your subclass to set the proper size of the output texture. | ||
| // Then call [super render]. The default implementation sets the size | ||
| // from inputTexture if a size has not already been set. | ||
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| - (BOOL) render; | ||
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| // Called as part of render; override if you don't want std triangulation | ||
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| - (void) draw; | ||
|
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| // Still image processing convenience methods | ||
| - (UIImage *) imageByFilteringImage:(UIImage *)imageToFilter; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| #import "GPUImageFilter.h" | ||
| #import "GPUImagePicture.h" | ||
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| @interface GPUImageFilter | ||
| - (GPUImageProgram *) filterProgramAtIndex:(int)n; | ||
| @end | ||
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| @implementation GPUImageFilter | ||
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| @dynamic inputTexture; | ||
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| #pragma mark - | ||
| #pragma mark Basic setup and utility | ||
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| + (int) numberOfFilterPrograms | ||
| { | ||
| return 1; | ||
| } | ||
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| - (id) init | ||
| { | ||
| if (self = [super init]) { | ||
| filterPrograms = [NSMutableArray array]; | ||
| int nFilters = [[self class] numberOfFilterPrograms]; | ||
| GPUImage *texture = nil; | ||
| for (int i = 0; i < nFilters; i++) { | ||
| GPUImageProgram *newProgram = [GPUImageProgram program]; | ||
| if (texture) { | ||
| [newProgram setValue:texture forKey:@"inputTexture"]; | ||
| } | ||
| [filterPrograms addObject:newProgram]; | ||
| texture = [GPUImage texture]; | ||
| [outputTextures addObject:texture]; | ||
| } | ||
| [[outputTextures lastObject] deriveFrom:self]; | ||
| } | ||
| return self; | ||
| } | ||
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| - (GPUImageProgram *)filterProgram { | ||
| return [self filterProgramAtIndex:0]; | ||
| } | ||
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| - (GPUImageProgram *)filterProgramOne { | ||
| return [self filterProgramAtIndex:0]; | ||
| } | ||
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| - (GPUImageProgram *)filterProgramTwo { | ||
| return [self filterProgramAtIndex:1]; | ||
| } | ||
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| - (GPUImageProgram *)filterProgramThree { | ||
| return [self filterProgramAtIndex:2]; | ||
| } | ||
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| - (GPUImageProgram *)filterProgramAtIndex:(int)n { | ||
| return [filterPrograms objectAtIndex:n]; | ||
| } | ||
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| - (GPUImage *)outputTexture { | ||
| return [outputTextures lastObject]; | ||
| } | ||
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| - (void) setOutputTexture:(GPUImage *)texture | ||
| { | ||
| GPUImage *oldOutput = [outputTextures lastObject]; | ||
| [outputTextures removeLastObject]; | ||
| [oldOutput undoDerivationFrom:self]; | ||
| [outputTextures addObject:texture]; | ||
| [texture deriveFrom:self]; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Rendering and drawing | ||
|
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| - (BOOL) render | ||
| { | ||
| // This is called via the update method in GPUImageElement, and is | ||
| // ultimately instigated by whoever downstream from us is pulling our | ||
| // product textures. By this point, all of our parent objects have been | ||
| // made current, so we just need to set up our rendering environment | ||
| // and draw. | ||
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| for (int i = 0; i < [filterPrograms count]; i++) { | ||
| GPUImageProgram *program = [filterPrograms objectAtIndex:i]; | ||
| GPUImage *output = [outputTextures objectAtIndex:i]; | ||
| if (program.inputTexture) { | ||
| [output takeUnknownParametersFrom:program.inputTexture]; | ||
| } | ||
| if (![program use] || ![output bindAsFramebuffer]) { | ||
| return NO; | ||
| } | ||
| [self draw]; | ||
| } | ||
| self.timeLastChanged = GPUImageGetCurrentTimestamp(); | ||
| return YES; | ||
| } | ||
|
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| - (void) draw | ||
| { | ||
| static const GLfloat squareVertices[] = { | ||
| -1.0, -1.0, | ||
| 1.0, -1.0, | ||
| -1.0, 1.0, | ||
| 1.0, 1.0, | ||
| }; | ||
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| static const GLfloat squareTextureCoordinates[] = { | ||
| 0.0, 0.0, | ||
| 1.0, 0.0, | ||
| 0.0, 1.0, | ||
| 1.0, 1.0, | ||
| }; | ||
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| // TODO: Work out attrib management | ||
| glVertexAttribPointer(filterPositionAttribute, 2, GL_FLOAT, 0, 0, squareVertices); | ||
| glVertexAttribPointer(filterTextureCoordinateAttribute, 2, GL_FLOAT, 0, 0, squareTextureCoordinates); | ||
| glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Still image convenience methods | ||
|
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| - (UIImage *) imageByFilteringImage:(UIImage *)imageToFilter | ||
| { | ||
| GPUImagePicture *stillImageSource = [[GPUImagePicture alloc] initWithImage:imageToFilter]; | ||
| [self.inputTexture deriveFrom:stillImageSource.outputTexture]; | ||
| [self.outputTexture update]; | ||
| [self.inputTexture underiveFrom:stillImageSource.outputTexture]; | ||
| return [self.outputTexture textureAsUIImage]; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Attribute and uniform processing | ||
|
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| // TODO: Handle attribs and uniforms on behalf of program | ||
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| @end |