Unity IntPtr图片加载

发表于

Unity2017.2

之前测试使用的Unity版本5.3;

这次是通过Android加载Bitmap,然后通过GLES画图获得IntPtr,然后在Unity通过IntPtr加载图片.
具体实现办法如下

Java代码

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public int loadTexturePtr(String imagePath) {
    Log.d(LOGTAG, "loading image1: " + imagePath);
    Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
    Log.d(LOGTAG, "Bitmap is: " + bitmap);
    ByteBuffer buffer = ByteBuffer.allocate(bitmap.getByteCount());
    bitmap.copyPixelsToBuffer(buffer);
    int textures[] = new int[1];
    GLES20.glGenTextures(1, textures, 0);
    int textureId = textures[0];
    GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
    GLUtils.texImage2D(GLES20.GL_TEXTURE_2D,0,bitmap,0);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
            GLES20.GL_CLAMP_TO_EDGE);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
            GLES20.GL_CLAMP_TO_EDGE);
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
    Log.d(LOGTAG, "texture id returned: " + textureId);
    return textureId;
}

Unity代码

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AndroidJavaObject ajo2 = new AndroidJavaObject("com.keefor.unity.ExternalTexture");
Int32 texPtr = ajo2.Call<Int32>("loadTexturePtr", "/storage/sdcard0/" + input);
Debug.Log("texture pointer? " + texPtr);
Texture2D nativeTexture = Texture2D.CreateExternalTexture(1920, 1080, TextureFormat.RGBA32, false, false, (IntPtr)texPtr);

计时方式

之前是使用Stopwatch来检测加载时长
后来了解到Time.realtimeSinceStartup也可以来检测时长

结果

本次检测同一张图片File加载方式比本次加载方式慢,但是本次图片显示是到过来的,需要旋转180°.