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POAndroid OpenGL ES Textures Showing On Black screen on Some Samsung devices
 

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  1. POAndroid OpenGL ES Textures Showing On Black screen on Some Samsung devices
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    <p>I recently worked on a live wallpaper application. In that i found out my Android live wallpaper has an odd issue. I use my HTC Wildfire S, Samsung Galaxy tab, Motorola Droid Millstone, Samsung galaxy pop to test my wallpaper along with the emulator and all is working fine, but on Samsung handsets (Samsung Galaxy S II and Samsung Galaxy Player have the symptom) the screen just stays Black for initial launch. But once we move to settings screen and return to preview its working fine.After a little debugging with those handsets I was able to find out that the wallpaper loads correctly, but the textures aren't just showing up. I tried searching about the problem, but didn't found anything helpful.</p> <p>I bind a texture form the native code. In that am using the OPEN GL library to bind wallpaper . My opengl library intiation is like following </p> <pre><code> glEnable(GL_TEXTURE_2D); glGenTextures(1, &amp;textureConverted); glBindTexture(GL_TEXTURE_2D,textureConverted); //...and bind it to our array __android_log_print(ANDROID_LOG_DEBUG, "NDK initOpenGL()", "binded texture" ); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); //Different possible texture parameters, e.g. GL10.GL_CLAMP_TO_EDGE glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); //GL_REPEAT); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); //GL_REPEAT); glTexImage2D(GL_TEXTURE_2D, /* target */ 0, /* level */ GL_RGBA, /* internal format */ textureWidth, /* width */ textureHeight, /* height */ 0, /* border */ GL_RGBA, /* format */ GL_UNSIGNED_BYTE,/* type */ NULL); //setup simple shading glShadeModel(GL_FLAT); //check_gl_error("glShademo_comdel"); glColor4x(0x10000, 0x10000, 0x10000, 0x10000); </code></pre> <p>and in my drawFunction</p> <pre><code> glClear(GL_COLOR_BUFFER_BIT); int max; glGetIntegerv(GL_MAX_TEXTURE_SIZE, &amp;max); __android_log_print(ANDROID_LOG_DEBUG, "NDK drawFrame()", "GL_MAX_TEXTURE_SIZE: %d", max); glBindTexture(GL_TEXTURE_2D,textureConverted); int rect[4] = {0, textureHeight, textureWidth, nTextureHeight}; glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, rect); glTexSubImage2D(GL_TEXTURE_2D, /* target */ 0, /* level */ 0, /* xoffset */ 0, /* yoffset */ textureWidth, textureHeight, GL_RGBA, /* format */ GL_UNSIGNED_BYTE, /* type */ pFrameConverted-&gt;data[0]); glDrawTexiOES(0, 0, 0, drawWidth, drawHeight); //drawWidth is th screenwidth and drawheight is the screenheight </code></pre> <p>Why doesn't this work on Samsung phones?</p>
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    1. COPut glGetError in the code and see if it hits anything. It's possible you could be exceeding the GL_MAX_TEXTURE_SIZE, but can't say for sure.
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      1. USTim
    2. COI tried with the glGetError() function in my code. It always returns 0. So i think no problem on there.
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      1. USSatheesh
    3. COyou need to give us more details: what are the values of textureWidth and textureHeight. Show us the code where you load the textures bitmaps and the code where you use glTexSubmage..
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