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我开始使用OpenGL-ES为Android编写游戏，并完成了使用glDrawTexfOES扩展的绘制代码。当我在模拟器上测试它时，它工作正常，但是在我的Samsung Galaxy S2上测试它，似乎所有的纹理都被绘制成白色。Android绘制纹理扩展绘制白色纹理
为了确保我没有犯任何错误，我从教程中复制了源代码并使用相同的结果运行它。我正在使用的教程代码可以看到here。
我的纹理是.PNG格式和两个幂，我从R.drawable文件夹中加载，尽管我已经尝试了一些其他位置，例如drawable-nodpi，正如我所看到的那样。
我也检查了我读过的glGenTextures的结果可以给某些手机的奇数值，但似乎给出了正确的值（1,2,3 ..）。
有人知道为什么会发生这种情况，或者建议我可以做一些其他检查来弄清楚什么是错的？
这是我上面链接的示例代码的一个稍作修改的版本，以保持简单。
public void onSurfaceCreated(GL10 gl10, EGLConfig eglConfig) {
gl10.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
// Set the background colour to black (rgba).
gl10.glClearColor(0.0f, 0.0f, 0.0f, 1);
// Enable Flat Shading.
gl10.glShadeModel(GL10.GL_FLAT);
// We don't need to worry about depth testing!
gl10.glDisable(GL10.GL_DEPTH_TEST);
// Set OpenGL to optimise for 2D Textures
gl10.glEnable(GL10.GL_TEXTURE_2D);
// Disable 3D specific features.
gl10.glDisable(GL10.GL_DITHER);
gl10.glDisable(GL10.GL_LIGHTING);
gl10.glTexEnvx(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, GL10.GL_MODULATE);
// Initial clear of the screen.
gl10.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
// Test for draw texture
// Test for device specific extensions
String extensions = gl10.glGetString(GL10.GL_EXTENSIONS);
boolean drawTexture = extensions.contains("draw_texture");
Log.i("OpenGL Support - ver.:",
gl10.glGetString(GL10.GL_VERSION) + " renderer:" +
gl10.glGetString(GL10.GL_RENDERER) + " : " +
(drawTexture ? "good to go!" : "forget it!!"));
// LOAD TEXTURE
mTextureName = new int[1];
// Generate Texture ID
gl10.glGenTextures(1, mTextureName, 0);
assert gl10.glGetError() == GL10.GL_NO_ERROR;
// Bind texture id/target (we want 2D of course)
gl10.glBindTexture(GL10.GL_TEXTURE_2D, mTextureName[0]);
// Open and input stream and read the image
InputStream is = mContext.getResources().openRawResource(R.drawable.asteroid);
Bitmap bitmap;
try {
bitmap = BitmapFactory.decodeStream(is);
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// Build our crop region to be the size of the bitmap (ie full image)
mCrop = new int[4];
mCrop[0] = 0;
mCrop[1] = imageHeight = bitmap.getHeight();
mCrop[2] = imageWidth = bitmap.getWidth();
mCrop[3] = -bitmap.getHeight();
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
assert gl10.glGetError() == GL10.GL_NO_ERROR;
bitmap.recycle();
}
public void onSurfaceChanged(GL10 gl10, int i, int i1) {
gl10.glViewport(0, 0, i, i1);
/*
* Set our projection matrix. This doesn't have to be done each time we
* draw, but usually a new projection needs to be set when the viewport
* is resized.
*/
float ratio = (float) i/i1;
gl10.glMatrixMode(GL10.GL_PROJECTION);
gl10.glLoadIdentity();
gl10.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
}
public void onDrawFrame(GL10 gl) {
// Just clear the screen and depth buffer.
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
// Begin drawing
//--------------
// These function calls can be experimented with for various effects such as transparency
// although certain functionality maybe device specific.
gl.glShadeModel(GL10.GL_FLAT);
gl.glEnable(GL10.GL_BLEND);
gl.glBlendFunc(GL10.GL_ONE, GL10.GL_ONE_MINUS_SRC_ALPHA);
gl.glColor4x(0x10000, 0x10000, 0x10000, 0x10000);
// Setup correct projection matrix
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glPushMatrix();
gl.glLoadIdentity();
gl.glOrthof(0.0f, mWidth, 0.0f, mHeight, 0.0f, 1.0f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glPushMatrix();
gl.glLoadIdentity();
gl.glEnable(GL10.GL_TEXTURE_2D);
// Draw all Textures
gl.glBindTexture(GL10.GL_TEXTURE_2D, mTextureName[0]);
((GL11)gl).glTexParameteriv(GL10.GL_TEXTURE_2D, GL11Ext.GL_TEXTURE_CROP_RECT_OES, mCrop, 0);
((GL11Ext)gl).glDrawTexfOES(0, 0, 0, imageWidth, imageHeight);
// Finish drawing
gl.glDisable(GL10.GL_BLEND);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glPopMatrix();
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glPopMatrix();
}
在银河上试过glGetError？ – Tim 2012-07-20 18:42:38
似乎没有引发任何错误，只是返回0（GL_NO_ERROR）我试过的任何地方。 – Greg 2012-07-21 07:59:02