I'm converting an app I've written from Canvas to OpenGL, and not having too
hard of a time yet.
However, I've run into one snag that I can't seem to get around. My old app
was threading image loads, because there are a ton of them, however, it
looks like the OpenGL implementation protects itself to a single thread. I
have a basic loadBitmap() function as follows:
protected static void loadBitmap(GLSprite sprite, int resourceId) {
int textureName = -1;
if (mContext != null && mGl != null) {
mGl.glGenTextures(1, mTextureNameWorkspace, 0);
textureName = mTextureNameWorkspace[0];
mGl.glBindTexture(GL10.GL_TEXTURE_2D, textureName);
mGl.glTexParameterf(GL10.GL_TEXTURE_2D,
GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
mGl.glTexParameterf(GL10.GL_TEXTURE_2D,
GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
mGl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S,
GL10.GL_CLAMP_TO_EDGE);
mGl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T,
GL10.GL_CLAMP_TO_EDGE);
mGl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE,
GL10.GL_REPLACE);
Bitmap bitmap = BitmapFactory.decodeResource(r, resourceId);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
mCropWorkspace[0] = 0;
mCropWorkspace[1] = bitmap.getHeight();
mCropWorkspace[2] = bitmap.getWidth();
mCropWorkspace[3] = -bitmap.getHeight();
sprite.setTextureName(textureName);
sprite.setSize(bitmap.getWidth(), bitmap.getHeight());
bitmap.recycle();
((GL11) mGl).glTexParameteriv(GL10.GL_TEXTURE_2D,
GL11Ext.GL_TEXTURE_CROP_RECT_OES, mCropWorkspace, 0);
int error = mGl.glGetError();
if (error != GL10.GL_NO_ERROR) {
// Logging
}
}
This is based heavily off of the SpriteMethodTest in apps-for-android. If I
make a call to this function from the thread that mGl was created from,
everything goes fine. However, if I thread the calls to this function, the
calls to glGenTextures() fail with a varying error code (changes with each
run). I haven't been able to find any information regarding how to deal
with this...
Any help?
Thanks
- Dan
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