com.adavr.player.Utils.java Source code

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Here is the source code for com.adavr.player.Utils.java

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/*
 * Copyright (C) 2015 Shotaro Uchida <fantom@xmaker.mx>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.adavr.player;

import java.nio.FloatBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.saintandreas.math.Matrix4f;

/**
 *
 * @author Shotaro Uchida <fantom@xmaker.mx>
 */
public class Utils {

    public static Matrix4f setupProjectionMatrix(double fov, double aspectRatio, double farPlane,
            double nearPlane) {
        float yScale = (float) (1.0 / Math.tan(Math.toRadians(fov / 2.0)));
        float xScale = (float) (yScale / aspectRatio);
        float frustumLength = (float) (farPlane - nearPlane);
        float tmp1 = (float) -((farPlane + nearPlane) / frustumLength);
        float tmp2 = (float) -((2 * farPlane * nearPlane) / frustumLength);
        return new Matrix4f(xScale, 0.0f, 0.0f, 0.0f, 0.0f, yScale, 0.0f, 0.0f, 0.0f, 0.0f, tmp1, tmp2, 0.0f, 0.0f,
                -1.0f, 0.0f);
    }

    public static FloatBuffer toFloatBuffer(Matrix4f matrix) {
        FloatBuffer buffer = BufferUtils.createFloatBuffer(16);
        for (int col = 0; col < 4; col++) {
            for (int row = 0; row < 4; row++) {
                buffer.put((float) matrix.get(row, col));
            }
        }
        buffer.flip();
        return buffer;
    }

    public static void bailIfError(String errorMessage) {
        int errorValue = GL11.glGetError();
        if (errorValue != GL11.GL_NO_ERROR) {
            System.err.println("ERROR: " + errorValue + ", " + errorMessage);
            throw new IllegalStateException(errorMessage);
        }
    }
}