android OpenGLES開発第5課テクスチャマッピング

public class Polygon {
	//      FloatBuffer

	private FloatBuffer[] textureBuffer;

	//          
	private int[] textures = new int[8];

	//            

	private float[][] texture = {
			new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.5f, 1.0f, 0.5f, 0.0f,
					1.0f, 1.0f, 1.0f,

			},
			new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.5f, 1.0f, 0.5f, 0.0f,
					1.0f, 1.0f, 1.0f,

			}, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,

			}, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,

			}, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,

			}, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,

			}, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,

			}, new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,

			} };

	public Polygon() {
		ByteBuffer bb;
		//         FloatBuffer

		textureBuffer = new FloatBuffer[8];
		for (int i = 0; i < 8; i++) {
			bb = ByteBuffer.allocateDirect(texture[i].length * 4);
			bb.order(ByteOrder.nativeOrder());
			textureBuffer[i] = bb.asFloatBuffer();
			textureBuffer[i].put(texture[i]);
			textureBuffer[i].position(0);
		}

	}

	public void draw(GL10 gl) {
		gl.glFrontFace(GL10.GL_CW);

		for (int i = 0; i < 8; i++) {
			// Generate one texture pointer...
			// ...and bind it to our array

			//         ，           
			gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[i]);
			// Point to our buffers
			//       

			gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer[i]);
			// Enable the texture state
			//          

			gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
			// Disable the client state before leaving
			//          

			gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
		}

	}

	//           
	public void loadTexture(GL10 gl, Context context) {
		// define the resourcesId
		 int[] resourcesIds = { R.drawable.gou, R.drawable.hou,
		 R.drawable.laohu, R.drawable.laoshu, R.drawable.tuzi,
		 R.drawable.xiaolong, R.drawable.xiaoniu, R.drawable.zhu };
		gl.glGenTextures(8, textures, 0);
		// Get the texture from the Android resource directory
		for (int i = 0; i < 8; i++) {
			Bitmap bitmap = loadBitmap(context, resourcesIds[i]);
			// Generate one texture pointer...
			// ...and bind it to our array
			gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[i]);

			// 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);
			// Use the Android GLUtils to specify a two-dimensional texture
			// image from our bitmap
			GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
			// Clean up
			bitmap.recycle();
		}
	}

	//   bitmap

	public Bitmap loadBitmap(Context context, int resourceid) {

		InputStream is = context.getResources().openRawResource(resourceid);
		try {
			// BitmapFactory is an Android graphics utility for images
			return BitmapFactory.decodeStream(is);

		} finally {
			// Always clear and close
			try {
				is.close();
				is = null;
			} catch (IOException e) {
			}
		}
	}
}