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POWhen I load a texture as RGBA4444 in openGL, how much memory is consumed in the device?
 

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  1. POWhen I load a texture as RGBA4444 in openGL, how much memory is consumed in the device?
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    <p>How much memory will consume a texture loaded with this method ?</p> <p>With this method, will a 1024x1024 texture consume 4MB anyway ? ( regardless of loading it as RGBA4444 ) ?</p> <pre><code>-(void)loadTexture:(NSString*)nombre { CGImageRef textureImage =[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:nombre ofType:nil]].CGImage; if (textureImage == nil) { NSLog(@"Failed to load texture image"); return; } // Dimensiones de nuestra imagen imageSizeX= CGImageGetWidth(textureImage); imageSizeY= CGImageGetHeight(textureImage); textureWidth = NextPowerOfTwo(imageSizeX); textureHeight = NextPowerOfTwo(imageSizeY); GLubyte *textureData = (GLubyte *)calloc(1,textureWidth * textureHeight * 4); CGContextRef textureContext = CGBitmapContextCreate(textureData, textureWidth,textureHeight,8, textureWidth * 4,CGImageGetColorSpace(textureImage),kCGImageAlphaPremultipliedLast ); CGContextDrawImage(textureContext, CGRectMake(0.0, 0.0, (float)textureWidth, (float)textureHeight), textureImage); /**************** Convert data to RGBA4444******************/ //Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRGGGGBBBBAAAA" void *tempData = malloc(textureWidth * textureHeight * 2); unsigned int* inPixel32 = (unsigned int*)textureData; unsigned short* outPixel16 = (unsigned short*)tempData; for(int i = 0; i &lt; textureWidth * textureHeight ; ++i, ++inPixel32) *outPixel16++ = ((((*inPixel32 &gt;&gt; 0) &amp; 0xFF) &gt;&gt; 4) &lt;&lt; 12) | // R ((((*inPixel32 &gt;&gt; 8) &amp; 0xFF) &gt;&gt; 4) &lt;&lt; 8) | // G ((((*inPixel32 &gt;&gt; 16) &amp; 0xFF) &gt;&gt; 4) &lt;&lt; 4) | // B ((((*inPixel32 &gt;&gt; 24) &amp; 0xFF) &gt;&gt; 4) &lt;&lt; 0); // A free(textureData); textureData = tempData; // Ya no necesitamos el bitmap, lo liberamos CGContextRelease(textureContext); glGenTextures(1, &amp;textures[0]); glBindTexture(GL_TEXTURE_2D, textures[0]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureWidth, textureHeight, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, textureData); free(textureData); //glEnable(GL_BLEND); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); </code></pre> <p>}</p>
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