2014/10/15 下午 10:04:34

iphone Programming Glossary: benchmarks

iPod Touch compared to iPhone as development platform for iPhone apps

http://stackoverflow.com/questions/1128245/ipod-touch-compared-to-iphone-as-development-platform-for-iphone-apps

http://stackoverflow.com/questions/1447598/when-to-use-calayer-on-the-mac-iphone

time to dig into this class iphone objective c cocoa cocoa touch core animation share improve this question In my benchmarks UIView and CALayer provide about the same level of performance on the iPhone. As rpetrich mentions in his comment UIViews..

Creating NSDecimal

http://stackoverflow.com/questions/2035421/creating-nsdecimal

iPhone app without using Interface Builder

http://stackoverflow.com/questions/2472691/iphone-app-without-using-interface-builder

that there is a performance benefit to be had using purely programmatic interfaces but Matt Gallagher ran a series of benchmarks and found that this speedup is only typically on the order of 5 10 . If you really want to shave that last bit off of your..

Can I mix OpenglES with standard Cocoa widgets on an iPhone app?

http://stackoverflow.com/questions/3057529/can-i-mix-opengles-with-standard-cocoa-widgets-on-an-iphone-app

can look at the source code to my Molecules application where I place two UIButtons on top of my OpenGL ES view. In my benchmarks you lose ~1 5 of your OpenGL framerate by placing other views on top of the OpenGL ES view which is not too terrible. What..

How do I convert the live video feed from the iPhone camera to grayscale?

http://stackoverflow.com/questions/4381513/how-do-i-convert-the-live-video-feed-from-the-iphone-camera-to-grayscale

data through various filters in this sample application using shaders with a writeup on how that works here . In my benchmarks the iPhone 4 can do this processing at 60 FPS with programmable shaders but you only get about 4 FPS if you rely on CPU..

Is number recognition on iPhone possible in real-time?

http://stackoverflow.com/questions/4887313/is-number-recognition-on-iphone-possible-in-real-time

better performance I believe that there's a lot of potential in the programmable GPUs on the newer iOS devices. In my benchmarks I saw a 14X 28X speedup when using the iPhone 4's GPU for simple image processing. While few people are looking at this..

How do I perform a fast pixellation filter on an image?

http://stackoverflow.com/questions/5049041/how-do-i-perform-a-fast-pixellation-filter-on-an-image

textureCoordinate mod textureCoordinate sampleDivisor gl_FragColor texture2D inputImageTexture samplePos In my benchmarks GPU based filters like this perform 6 24X faster than equivalent CPU bound processing routines for images and video on iOS...

OpenGL-ES 2.0 VS OpenGL-ES 1.1, which is faster?

http://stackoverflow.com/questions/5682010/opengl-es-2-0-vs-opengl-es-1-1-which-is-faster

these shapes wouldn't be handled right in that case . A million triangles might be a bit much for these devices. In my benchmarks the old iPhone 3G did around 500 000 triangles per second and the first generation iPad about 2 000 000. I haven't fully..

How can I improve the performance of my custom OpenGL ES 2.0 depth texture generation?

http://stackoverflow.com/questions/6051237/how-can-i-improve-the-performance-of-my-custom-opengl-es-2-0-depth-texture-gener

from simply stacking on one another yet still using some of the hardware optimizations within the PowerVR GPUs. In my benchmarks rendering the test model I used above yields times of 18 35 ms per frame as compared to the 35 68 ms I was getting previously..

How many maximum triangles can be drawn on ipad using opengl es in 1 frame?

http://stackoverflow.com/questions/6175018/how-many-maximum-triangles-can-be-drawn-on-ipad-using-opengl-es-in-1-frame

The more vertices you send the more memory your application will use and the slower it will render. For example in my benchmarks I was able to push over 1 800 000 triangles per second on an iPad 1 using OpenGL ES 1.1 smooth shading a single light source..

Are the Core Image filters in iOS 5.0 fast enough for realtime video processing?

http://stackoverflow.com/questions/6625888/are-the-core-image-filters-in-ios-5-0-fast-enough-for-realtime-video-processing

as of iOS 6 it processes video more than fast enough to do live filtering on iPhone 4S and above. The source for these benchmarks can be found in my GitHub repository if you wish to see where I got these numbers from. I've updated this answer from my..

Faster alternative to glReadPixels in iPhone OpenGL ES 2.0

http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0

so there will be no need to pull them down using glReadPixels . This is much much faster than using glReadPixels in my benchmarks. I found that on my iPhone 4 glReadPixels was the bottleneck in reading 720p video frames for encoding to disk. It limited..