save OpenGL Texture - Android android.opengl

Android examples for android.opengl:OpenGL Texture

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Description

save OpenGL Texture

Demo Code

/*//w  w w. jav a2 s . c  om
 * Copyright (C) 2010 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.java2s;
import android.graphics.Bitmap;
import android.opengl.GLES20;

import java.nio.ByteBuffer;

public class Main {
    public static Bitmap saveTexture(int texture, int width, int height) {
        int[] frame = new int[1];
        GLES20.glGenFramebuffers(1, frame, 0);
        checkGlError("glGenFramebuffers");
        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frame[0]);
        checkGlError("glBindFramebuffer");
        GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER,
                GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, texture,
                0);
        checkGlError("glFramebufferTexture2D");

        ByteBuffer buffer = ByteBuffer.allocate(width * height * 4);
        GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA,
                GLES20.GL_UNSIGNED_BYTE, buffer);
        checkGlError("glReadPixels");
        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        bitmap.copyPixelsFromBuffer(buffer);

        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
        checkGlError("glBindFramebuffer");
        GLES20.glDeleteFramebuffers(1, frame, 0);
        checkGlError("glDeleteFramebuffer");
        return bitmap;
    }

    private static void checkGlError(String op) {
        int error;
        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
            throw new RuntimeException(op + ": glError " + error);
        }
    }
}

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