GLUtils.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.android.ide.eclipse.gltrace;


import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;

public class GLUtils {
    public static String formatData(byte[] data, GLEnum format) {
        switch (format) {
            case GL_BYTE:
                return formatBytes(data, false);
            case GL_UNSIGNED_BYTE:
                return formatBytes(data, true);
            case GL_SHORT:
                return formatShorts(data, false);
            case GL_UNSIGNED_SHORT:
                return formatShorts(data, true);
            case GL_FIXED:
                return formatInts(data);
            case GL_FLOAT:
                return formatFloats(data);
            default:
                return ""; //$NON-NLS-1$
        }
    }

    private static String formatFloats(byte[] data) {
        FloatBuffer bb = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asFloatBuffer();

        StringBuilder sb = new StringBuilder(bb.capacity() * 3);

        while (bb.remaining() > 0) {
            sb.append(String.format("%.4f", bb.get()));
            sb.append(',');
            sb.append('\n');
        }

        return sb.toString();
    }

    private static String formatInts(byte[] data) {
        IntBuffer bb = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asIntBuffer();

        StringBuilder sb = new StringBuilder(bb.capacity() * 3);

        while (bb.remaining() > 0) {
            sb.append(bb.get());
            sb.append(',');
            sb.append('\n');
        }

        return sb.toString();
    }

    private static String formatShorts(byte[] data, boolean unsigned) {
        ShortBuffer bb = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer();

        StringBuilder sb = new StringBuilder(bb.capacity() * 3);

        while (bb.remaining() > 0) {
            if (unsigned) {
                sb.append(bb.get() & 0xffff);
            } else {
                sb.append(bb.get());
            }
            sb.append(',');
            sb.append('\n');
        }

        return sb.toString();
    }

    private static String formatBytes(byte[] data, boolean unsigned) {
        ByteBuffer bb = ByteBuffer.wrap(data);

        StringBuilder sb = new StringBuilder(bb.capacity() * 3);

        while (bb.remaining() > 0) {
            if (unsigned) {
                sb.append(bb.get() & 0xff);
            } else {
                sb.append(bb.get());
            }

            sb.append(',');
            sb.append('\n');
        }

        return sb.toString();
    }
}