Java图像作为ByteBuffer用于OpenGL纹理映射

Question

I'm using openGL and trying to get my head around texture mapping.

At the moment, I have the following to add an image that I will use:

GL11.glBindTexture(GL11.GL_TEXTURE_2D, 1);
GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);

GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
GL11.glTexParameteri (GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
GL11.glTexParameteri (GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
GL11.glTexParameteri (GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);

GL11.glTexEnvf(GL11.GL_TEXTURE_ENV, GL11.GL_TEXTURE_ENV_MODE, GL11.GL_MODULATE);

GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, 32, 32, 0, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, "imageData");

Where I have the string "imageData" I need a ByteBuffer for my image. How do I get this? The image is in my src folder in Eclipse.

Answer 1

This is untested but looks like it would work

ByteBuffer buffer = ByteBuffer.wrap(getBytesFromFile(filename));

There's an implementation of getBytesFromFile at http://www.exampledepot.com/egs/java.io/File2ByteArray.html

EDIT: Okay that example is really gone now, so here's an implementation of reading to a ByteBuffer

private static ByteBuffer readToBuffer(String filename) throws IOException
{
    File file = new File(filename);
    ByteBuffer bb = ByteBuffer.allocate((int) file.length());
    FileInputStream fis = new FileInputStream(filename);

    int bytesRead = 0;
    byte[] buf = new byte[BYTES_PER_READ];

    while (bytesRead != -1)
    {
        bb.put(buf, 0, bytesRead);
        bytesRead = fis.read(buf);
    }

    fis.close();

    return bb;
}