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POCVOpenGLESTextureCacheCreateTextureFromImage on iPad2 is too slow ,it needs almost 30 ms, too crazy
 

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  1. POCVOpenGLESTextureCacheCreateTextureFromImage on iPad2 is too slow ,it needs almost 30 ms, too crazy
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    <p>I use opengl es to display bgr24 data on iPad, I am new about opengl es ,so in display video part I use code from RosyWriter one APPLE sample. It works, but the CVOpenGLESTextureCacheCreateTextureFromImage function cost more than 30ms, while in RosyWriter its cost is negligible. what I do is first transform BGR24 to BGRA pixel format, then use CVPixelBufferCreateWithBytes function create a CVPixelBufferRef, and then get a CVOpenGLESTextureRef by CVOpenGLESTextureCacheCreateTextureFromImage. My codes as following,</p> <pre><code>- (void)transformBGRToBGRA:(const UInt8 *)pict width:(int)width height:(int)height { rgb.data = (void *)pict; vImage_Error error = vImageConvert_RGB888toARGB8888(&amp;rgb,NULL,0,&amp;argb,NO,kvImageNoFlags); if (error != kvImageNoError) { NSLog(@"vImageConvert_RGB888toARGB8888 error"); } const uint8_t permuteMap[4] = {1,2,3,0}; error = vImagePermuteChannels_ARGB8888(&amp;argb,&amp;bgra,permuteMap,kvImageNoFlags); if (error != kvImageNoError) { NSLog(@"vImagePermuteChannels_ARGB8888 error"); } free((void *)pict); } </code></pre> <p>and after transform, will generate CVPixelBufferRef, codes as following,</p> <pre><code>[self transformBGRToBGRA:pict width:width height:height]; CVPixelBufferRef pixelBuffer; CVReturn err = CVPixelBufferCreateWithBytes(NULL, width, height, kCVPixelFormatType_32BGRA, (void*)bgraData, bytesByRow, NULL, 0, NULL, &amp;pixelBuffer); if(!pixelBuffer || err) { NSLog(@"CVPixelBufferCreateWithBytes failed (error: %d)", err); return; } CVOpenGLESTextureRef texture = NULL; err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault, videoTextureCache, pixelBuffer, NULL, GL_TEXTURE_2D, GL_RGBA, width, height, GL_BGRA, GL_UNSIGNED_BYTE, 0, &amp;texture); if (!texture || err) { NSLog(@"CVOpenGLESTextureCacheCreateTextureFromImage failed (error: %d)", err); CVPixelBufferRelease(pixelBuffer); return; } </code></pre> <p>The other codes is almost similar RosyWriter sample, include shaders. So I want to know why, how to fix this problem.</p>
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    1. COWhat size is the image you are trying to upload? Are you sure that you're not measuring the time of your `-transformBGRToBGRA:` method in that 30 ms?
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    2. COYes, I am sure.It is 1024 * 768, the time of transformBGRToBGRA: I have measured is 10ms.
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    3. COOK, so the 30 ms that you measure is from right before the `CVPixelBufferCreateWithBytes()` call to right after the `CVOpenGLESTextureCacheCreateTextureFromImage()` call? That seems extremely high, because I've seen an iPad 2 upload 1080p frames (2.6X more pixels) much faster than in 30 ms. What are your times if you just use `glTexImage2D()` with this data?
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