Also you can use glTexSubImage2D() if only a portion of your bitmap is changing. For these sorts of operations android.opengl.GLUtils will be *much* more efficient (and simpler) than your current approach of populating a ByteBuffer since the native helper methods can access the Bitmap pixel data directly. Tom
2009/7/2 Bruce Rees <[email protected]> > > Hi All, > > I have a texture-mapped cube based in part on the Kube API demo and > the Textured Cube example from anddev.org, It is working fine using > bitmaps loaded from R.drawable.. what I need to do now is to make the > texture for each face dynamic (using Bitmaps created in code). I'm > having trouble understanding how to change the textures on the fly and > I'm hoping someone can point me in the right direction.. > > This is the code that initially sets a texture: > > gl.glBindTexture(GL10.GL_TEXTURE_2D, texBuf.get(num)); > Bitmap bmp = > BitmapFactory.decodeResource(context.getResources(), > id); > int pixels[] = new int[TEX_SIZE * TEX_SIZE]; > bmp.getPixels(pixels, 0, TEX_SIZE, 0, 0, TEX_SIZE, > TEX_SIZE); > int pix1[] = new int[TEX_SIZE * TEX_SIZE]; > for (int i = 0; i < TEX_SIZE; i++) > { > for (int j = 0; j < TEX_SIZE; j++) > { > //correction of R and B > int pix = pixels[i * TEX_SIZE + j]; > int pb = (pix >> 16) & 0xff; > int pr = (pix << 16) & 0x00ff0000; > int px1 = (pix & 0xff00ff00) | pr | pb; > //correction of rows > pix1[(TEX_SIZE - i - 1) * TEX_SIZE + j] = > px1; > } > } > > IntBuffer tbuf = IntBuffer.wrap(pix1); > tbuf.position(0); > gl.glTexImage2D(GL10.GL_TEXTURE_2D, 0, GL10.GL_RGBA, > TEX_SIZE, > TEX_SIZE, 0, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, tbuf); > gl.glTexParameterx(GL10.GL_TEXTURE_2D, > GL10.GL_TEXTURE_MIN_FILTER, > GL10.GL_LINEAR); > gl.glTexParameterx(GL10.GL_TEXTURE_2D, > GL10.GL_TEXTURE_MAG_FILTER, > GL10.GL_LINEAR); > > What would I need to change in this code to allow an existing texture > to be replaced (eg. a new Bitmap would be passed in instead of loading > the resource, but when I try this the texture remains unchanged). > > Thanks! > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
