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#import "GPUImageBuffer.h"
@interface GPUImageBuffer()
@end
@implementation GPUImageBuffer
@synthesize bufferSize = _bufferSize;
#pragma mark -
#pragma mark Initialization and teardown
- (id)init;
{
if (!(self = [self initWithFragmentShaderFromString:kGPUImagePassthroughFragmentShaderString]))
{
return nil;
}
bufferedFramebuffers = [[NSMutableArray alloc] init];
// [bufferedTextures addObject:[NSNumber numberWithInt:outputTexture]];
_bufferSize = 1;
return self;
}
- (void)dealloc
{
for (GPUImageFramebuffer *currentFramebuffer in bufferedFramebuffers)
{
[currentFramebuffer unlock];
}
}
#pragma mark -
#pragma mark GPUImageInput
- (void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex;
{
if ([bufferedFramebuffers count] >= _bufferSize)
{
outputFramebuffer = [bufferedFramebuffers objectAtIndex:0];
[bufferedFramebuffers removeObjectAtIndex:0];
}
else
{
// Nothing yet in the buffer, so don't process further until the buffer is full
outputFramebuffer = firstInputFramebuffer;
[firstInputFramebuffer lock];
}
[bufferedFramebuffers addObject:firstInputFramebuffer];
// Need to pass along rotation information, as we're just holding on to buffered framebuffers and not rotating them ourselves
for (id<GPUImageInput> currentTarget in targets)
{
if (currentTarget != self.targetToIgnoreForUpdates)
{
NSInteger indexOfObject = [targets indexOfObject:currentTarget];
NSInteger textureIndex = [[targetTextureIndices objectAtIndex:indexOfObject] integerValue];
[currentTarget setInputRotation:inputRotation atIndex:textureIndex];
}
}
// Let the downstream video elements see the previous frame from the buffer before rendering a new one into place
[self informTargetsAboutNewFrameAtTime:frameTime];
// [self renderToTextureWithVertices:imageVertices textureCoordinates:[[self class] textureCoordinatesForRotation:inputRotation]];
}
- (void)renderToTextureWithVertices:(const GLfloat *)vertices textureCoordinates:(const GLfloat *)textureCoordinates;
{
// No need to render to another texture anymore, since we'll be hanging on to the textures in our buffer
}
#pragma mark -
#pragma mark Accessors
- (void)setBufferSize:(NSUInteger)newValue;
{
if ( (newValue == _bufferSize) || (newValue < 1) )
{
return;
}
if (newValue > _bufferSize)
{
NSUInteger texturesToAdd = newValue - _bufferSize;
for (NSUInteger currentTextureIndex = 0; currentTextureIndex < texturesToAdd; currentTextureIndex++)
{
// TODO: Deal with the growth of the size of the buffer by rotating framebuffers, no textures
}
}
else
{
NSUInteger texturesToRemove = _bufferSize - newValue;
for (NSUInteger currentTextureIndex = 0; currentTextureIndex < texturesToRemove; currentTextureIndex++)
{
GPUImageFramebuffer *lastFramebuffer = [bufferedFramebuffers lastObject];
[bufferedFramebuffers removeObjectAtIndex:([bufferedFramebuffers count] - 1)];
[lastFramebuffer unlock];
lastFramebuffer = nil;
}
}
_bufferSize = newValue;
}
@end