please can you explain it a little more? i'm new in open GL.
What you mean with non power of two?
what is POT?
On 3 oct, 17:56, Latimerius <l4t1m3r...@googlemail.com> wrote:
> In my experience, the classic cause of "white" textures on some hardware but
> not other is a non-power-of-two texture. Your code doesn't seem to enforce
> POT texture dimensions, are your assets POT?
>
>
>
>
>
>
>
> On Mon, Oct 3, 2011 at 5:43 PM, saex <elpablos...@gmail.com> wrote:
> > i have an app that draws a square on the screen with a texture, and
> > the user can rotate the square touching the screen. It works fine with
> > android 1.5 to 2.1. But when i test the App on a Motorola Droid with
> > android 2.2.2 something is failing because the square is loaded with a
> > white texture.
>
> > What is wrong?
>
> > This is the code of my class square:
>
> > public class Square {
>
> > /** The buffer holding the vertices */
> > private FloatBuffer vertexBuffer;
> > /** The buffer holding the texture coordinates */
> > private FloatBuffer textureBuffer;
> > /** Our texture pointer */
> > private int[] textures = new int[3];
>
> > /** The initial vertex definition */
> > private float vertices[] = {
> > -1.0f, -1.0f, 0.0f,
> > //Bottom Left
> > 1.0f, -1.0f, 0.0f,
> > //Bottom Right
> > -1.0f, 1.0f, 0.0f,
> > //Top Left
> > 1.0f, 1.0f, 0.0f
> > //Top Right
>
> > };
> > /** The initial texture coordinates (u, v) */
>
> > private float texture[] = {
> > //Mapping coordinates for the
> > vertices
> > 0.0f, 0.0f,
> > 0.0f, 1.0f,
> > 1.0f, 0.0f,
> > 1.0f, 1.0f
> > };
>
> > /**
> > * The Square constructor.
> > *
> > * Initiate the buffers.
> > */
> > public Square() {
> > //
> > ByteBuffer byteBuf =
> > ByteBuffer.allocateDirect(vertices.length * 4);
> > byteBuf.order(ByteOrder.nativeOrder());
> > vertexBuffer = byteBuf.asFloatBuffer();
> > vertexBuffer.put(vertices);
> > vertexBuffer.position(0);
> > //
> > byteBuf = ByteBuffer.allocateDirect(texture.length * 4);
> > byteBuf.order(ByteOrder.nativeOrder());
> > textureBuffer = byteBuf.asFloatBuffer();
> > textureBuffer.put(texture);
> > textureBuffer.position(0);
> > }
>
> > /**
> > * The object own drawing function.
> > * Called from the renderer to redraw this instance
> > * with possible changes in values.
> > *
> > * @param gl - The GL Context
> > */
> > public void draw(GL10 gl) {
> > //Set the face rotation
> > //gl.glFrontFace(GL10.GL_CW);
> > gl.glFrontFace(GL10.GL_CCW);
> > //Bind our only previously generated texture in this case
> > gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
> > //Point to our vertex buffer
> > gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
> > gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer);
> > //Enable vertex buffer
> > gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
> > gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
> > //Set The Color To Blue
> > //gl.glColor4f(0.5f, 0.5f, 1.0f, 1.0f);
> > //Draw the vertices as triangle strip
> > gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length /
> > 3);
> > //Disable the client state before leaving
> > gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
> > gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
>
> > ///
> > //Bind the texture according to the set texture filter
> > //gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[filter]);
> > }
>
> > /**
> > * Load the textures
> > *
> > * @param gl - The GL Context
> > * @param context - The Activity context
> > */
> > public void loadGLTexture(GL10 gl, Context context) {
> > //Generate one texture pointer...
> > gl.glGenTextures(1, textures, 0);
> > //...and bind it to our array
> > gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
> > //Create Nearest Filtered Texture
> > gl.glTexParameterf(GL10.GL_TEXTURE_2D,
> > GL10.GL_TEXTURE_MIN_FILTER,
> > GL10.GL_NEAREST);
> > gl.glTexParameterf(GL10.GL_TEXTURE_2D,
> > GL10.GL_TEXTURE_MAG_FILTER,
> > GL10.GL_LINEAR);
>
> > //Different possible texture parameters, e.g.
> > GL10.GL_CLAMP_TO_EDGE
> > gl.glTexParameterf(GL10.GL_TEXTURE_2D,
> > GL10.GL_TEXTURE_WRAP_S,
> > GL10.GL_REPEAT);
> > gl.glTexParameterf(GL10.GL_TEXTURE_2D,
> > GL10.GL_TEXTURE_WRAP_T,
> > GL10.GL_REPEAT);
>
> > //Get the texture from the Android resource directory
> > InputStream is =
> > context.getResources().openRawResource(R.drawable.radiocd2);
> > Bitmap bitmap = null;
> > try {
> > //BitmapFactory is an Android graphics utility for
> > images
> > bitmap = BitmapFactory.decodeStream(is);
>
> > } finally {
> > //Always clear and close
> > try {
> > is.close();
> > is = null;
> > } catch (IOException e) {
> > }
> > }
>
> > //Use the Android GLUtils to specify a two-dimensional
> > texture image
> > from our bitmap
> > GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
>
> > /*
> > * This is a change to the original tutorial, as buildMipMap
> > does
> > not exist anymore
> > * in the Android SDK.
> > *
> > * We check if the GL context is version 1.1 and generate
> > MipMaps by
> > flag.
> > * Otherwise we call our own buildMipMap implementation
> > */
> > if(gl instanceof GL11) {
> > gl.glTexParameterf(GL11.GL_TEXTURE_2D,
> > GL11.GL_GENERATE_MIPMAP,
> > GL11.GL_TRUE);
> > GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap,
> > 0);
>
> > //
> > } else {
> > buildMipmap(gl, bitmap);
> > }
>
> > //Clean up
> > bitmap.recycle();
> > }
>
> > /**
> > * Our own MipMap generation implementation.
> > * Scale the original bitmap down, always by factor two,
> > * and set it as new mipmap level.
> > *
> > * Thanks to Mike Miller (with minor changes)!
> > *
> > * @param gl - The GL Context
> > * @param bitmap - The bitmap to mipmap
> > */
> > private void buildMipmap(GL10 gl, Bitmap bitmap) {
> > //
> > int level = 0;
> > //
> > int height = bitmap.getHeight();
> > int width = bitmap.getWidth();
>
> > //
> > while(height >= 1 || width >= 1) {
> > //First of all, generate the texture from our bitmap
> > and set it to
> > the according level
> > GLUtils.texImage2D(GL10.GL_TEXTURE_2D, level,
> > bitmap, 0);
>
> > //
> > if(height == 1 || width == 1) {
> > break;
> > }
>
> > //Increase the mipmap level
> > level++;
>
> > //
> > height /= 2;
> > width /= 2;
> > Bitmap bitmap2 = Bitmap.createScaledBitmap(bitmap,
> > width, height,
> > true);
>
> > //Clean up
> > bitmap.recycle();
> > bitmap = bitmap2;
> > }
> > }
> > }
>
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