关于三星Galaxy ACE GT-S5830 ETC1纹理支持 [英] ETC1 texture support on Samsung Galaxy ACE GT-S5830

问题描述

我有这个三星Galaxy ACE GT-S5830 Android手机。
其具有的Adreno-200的GPU。

I have this Samsung Galaxy ACE GT-S5830 android phone. which has an Adreno-200 GPU.

我本来期望它有ETC（爱立信的COM pression格式）的支持，
不过貌似不能加载它们。

I would have expected it to have the ETC (Ericsson Compression format) support, but looks like it cannot load them.

虽然gl.glGetString（GL10.GL_EXTENSIONS）函数包含GL_OES_com pressed_ETC1_RGB8_texture扩展。

Although the gl.glGetString(GL10.GL_EXTENSIONS) function contains the GL_OES_compressed_ETC1_RGB8_texture extension.

但android.opengl.ETC1Util.isETC1Supported（）返回false？
这太奇怪了。

but the android.opengl.ETC1Util.isETC1Supported() returns false ??? This is so strange.

我已经转换我的文件.pkm格式。
这就是我如何加载纹理，但所有我看到的是白色的屏幕显示纹理不加载。

I have converted my files to .pkm format. This is how i am loading the texture, but all i see is the white-screen indicating the texture is not loaded. :

InputStream is= _context.getAssets().open("etc/hands_tex.pkm");                     
gl.glActiveTexture(GL10.GL_TEXTURE0);   //texture unit to load texture to.
gl.glBindTexture(GL10.GL_TEXTURE_2D, glTextureId);
try {
    ETC1Texture etc1tex = ETC1Util.createTexture(is);               
    ByteBuffer bb = etc1tex.getData();              
    gl.glCompressedTexImage2D(GL10.GL_TEXTURE_2D, level, ETC1.ETC1_RGB8_OES, etc1tex.getWidth(), etc1tex.getHeight(), 0, bb.capacity(), bb);                
} catch (IOException e) {
   e.printStackTrace();
}

尽管上述作品ETC1Util.createTexture（）呼叫，并在内存中创建纹理对象。

Even though the call to ETC1Util.createTexture() above works and creates the texture object in memory.

推荐答案

我从来没有用过Java的GL，但我写的OpenGL本土code为Android使用ETC1 COM pression所以希望我可以帮。 ETC1是Android常见的质感COM pression格式，并具有扩展present显示设备支持它。 ：）

I've never used Java GL but i've written native OpenGL code for Android that uses ETC1 compression so hopefully i can help. ETC1 is the common texture compression format for Android and having the extension present shows that your device supports it. :)

有一些未知这里，你应该尝试解决。

There are a few unknowns here that you should try and resolve.

这可能是你的纹理加载和显示code出现故障，而不是ETC1一部分。所以，你应该尝试换出ETC1和使用非COM pressed安全的格式，如32位到
检查正确显示。

It might be your texture loading and display code is faulty, not the ETC1 part. So you should probably try swapping out ETC1 and use a non-compressed safe format such as 32bit to check that displays correctly.

然后尝试用一个简单的32×32 ETC1纹理除去具有影响力的非方形NPOT大小。使用硬codeD值的的 glCom pressedTexImage2D 的电话：

Then try using a simple 32x32 ETC1 texture to remove non-square NPOT sizes having a influence. Use hard-coded values for the glCompressedTexImage2D call:

gl.glCompressedTexImage2D(GL10.GL_TEXTURE_2D, level, ETC1.ETC1_RGB8_OES, 32, 32, 0, 512, bb);

确认的 BB 的是有效的，如果过程为NULL是一个有效的参数。
从返回code的 glCom pressedTexImage2D 的也是非常有用的。

Make sure bb is valid if course as NULL is a valid parameter. The return code from glCompressedTexImage2D is also very useful too.

道歉，如果你已经尝试过这一点。
希望有利用它，
刘德华

Apologies if you've already tried this. Hope its of some use, Andy

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