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POHow to use high-quality rendering for an Android resource bitmap loaded into an OpenGL texture?
 

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  1. POHow to use high-quality rendering for an Android resource bitmap loaded into an OpenGL texture?
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    <p>I know very little about OpenGL so please be gentle.</p> <p>The app needs to load a bitmap (from resources), resize it, and use it in an OpenGL texture. I have an implementation that works, but there was a bad banding issue on the Wildfire S. So I changed the implementation and fixed the banding issue (by switching to ARGB_8888) but that then broke the functionality on the Galaxy Nexus and the Nexus One.</p> <p>I am seeing three visual presentations:</p> <ol> <li><p>The bitmap (a smooth 24-bit gradient) shows correctly, with no banding.</p></li> <li><p>The gradient shows, but with obvious banding</p></li> <li><p>The texture shows as flat white, no bitmap (or issues in logcat)</p></li> </ol> <p>Here are two versions of the method to load the bitmap, and notes on the results seen with each:</p> <pre><code> // White on Galaxy Nexus. White on Nexus One. Renders correct image (no banding) on Wildfire S private Bitmap getBitmap1() { BitmapFactory.Options options = new BitmapFactory.Options(); options.inPreferredConfig = Bitmap.Config.ARGB_8888; options.outWidth = getTextureSize(); options.outHeight = getTextureSize(); final Bitmap bmp; bmp = BitmapFactory.decodeResource(getResources(), bitmapResourceId, options); return bmp; } // Renders correctly (no banding) on Galaxy Nexus. Renders on Nexus One and Wildfire S but with obvious banding. private Bitmap getBitmap2() { int textureSize = getTextureSize(); BitmapFactory.Options options = new BitmapFactory.Options(); options.inPreferredConfig = Bitmap.Config.ARGB_8888; options.outWidth = getTextureSize(); options.outHeight = getTextureSize(); final Bitmap bmp; bmp = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(), bitmapResourceId, options), textureSize, textureSize, true); return bmp; } </code></pre> <p>getTextureSize() returns 1024.</p> <p>How do I build a single method that shows the bitmap without banding on all devices, and without any devices show a big white box?</p>
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    1. COFor the phones where it is white, can you try inserting glGetError calls in your program flow and see if it returns anything? If the return is nonzero it is an error code that indicates some kind of problem. You won't necessarily see any problems in logcat from incorrect opengl api usage, it just fails silently unless you check the error codes.
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    2. COThanks Tim. The error code is 1281.
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