tests/gdx-tests-android/src/com/badlogic/gdx/tests/android/MatrixTest.java

/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.tests.android;

import javax.microedition.khronos.opengles.GL10;

import android.opengl.Matrix;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.Matrix4;
import com.badlogic.gdx.tests.utils.GdxTest;

public class MatrixTest extends GdxTest {

	BitmapFont font;
	SpriteBatch batch;
	String results = "no results";

	@Override
	public void create () {
		font = new BitmapFont();
		batch = new SpriteBatch();

		Matrix4 m1 = new Matrix4();
		Matrix4 m2 = new Matrix4();
		float[] a1 = new float[16];
		float[] a2 = new float[16];
		float[] a3 = new float[16];
		Matrix.setIdentityM(a1, 0);
		Matrix.setIdentityM(a2, 0);
		Matrix.setIdentityM(a3, 0);

		long startTime = System.nanoTime();
		int ops = 0;
		while (System.nanoTime() - startTime < 5000000000l) {
			Matrix.multiplyMM(a1, 0, a2, 0, a3, 0);
			ops++;
		}
		results = "Matrix ops: " + ops + "\n";

		// warm up
		startTime = System.nanoTime();
		ops = 0;
		while (System.nanoTime() - startTime < 2000000000l) {
			m1.mul(m2);
			ops++;
		}

		startTime = System.nanoTime();
		ops = 0;
		while (System.nanoTime() - startTime < 5000000000l) {
			m1.mul(m2);
			ops++;
		}
		results += "Matrix4 ops: " + ops + "\n";
	}

	@Override
	public void render () {
		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
		batch.begin();
		font.draw(batch, results, 20, 300);
		batch.end();
	}
}