使用VAO在JOGL中纹理为黑色

Question

So far, I used the deprecated immediate mode rendering, and I'm trying to switch to VAO then VBO. 2D quads are normally rendered using VAO, but when I'm trying to attach a texture, it remains black. I would really appreciate if somebody could take a look at my code, and point out the part where I'm wrong.

public class CSpriteVAO {
/*VAO*/
private FloatBuffer vertices;
private ShortBuffer indices;
private FloatBuffer textures;
private int VAOVertices;
private int VAOIndices;
private int VAOTextures;

/*SPRITE*/
private String mTexture;
private CPoint mPosition;
private CPoint mDimension;
private CPreferences mPreferences;

public CSpriteVAO(GL2 gl, CPreferences preferences, String spriteID, CRectangle dimensions){
    mPreferences = preferences;
    mTexture = spriteID;
    mDimension = new CPoint(dimensions.width, dimensions.height);
    mPosition = new CPoint(dimensions.x, dimensions.y);

    CCreateVAO(gl);
}

public void onDraw(GL2 gl){
    gl.glLoadIdentity();
    CBindTexture(gl);
    CDraw(gl);
}

private void CDraw(GL2 gl){
    //gl.glCullFace(GL2.GL_CW);
    gl.glTranslatef(mPosition.x, mPosition.y, 0);
    gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
    gl.glEnableClientState(GL2.GL_TEXTURE_COORD_ARRAY);
        gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, VAOVertices);
        gl.glVertexPointer(3, GL2.GL_FLOAT, 0, 0);

        gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, VAOTextures);
        gl.glTexCoordPointer(2, GL2.GL_FLOAT, 0, VAOTextures);

        gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, VAOIndices);
        gl.glDrawElements(GL2.GL_TRIANGLES, indices.capacity(), GL2.GL_UNSIGNED_SHORT, 0);

    gl.glDisableClientState(GL2.GL_TEXTURE_COORD_ARRAY);
    gl.glDisableClientState(GL2.GL_VERTEX_ARRAY);
}

private void CCreateVAO(GL2 gl){
    //float[] textureArray = {0f, 1f, 1f, 1f, 1f, 0f, 0f, 0f};
    float[] textureArray = {0f, 0f, 1f, 0f, 1f, 1f, 0f, 1f};
    textures = Buffers.newDirectFloatBuffer(textureArray.length);
    textures.put(textureArray);
    textures.flip();

    float[] vertexArray = {0,            mDimension.y, 0,
                           mDimension.x, mDimension.y, 0,
                           mDimension.x, 0,            0,
                           0,            0,            0};
    vertices = Buffers.newDirectFloatBuffer(vertexArray.length);
    vertices.put(vertexArray);
    vertices.flip();

    short[] indexArray = {0, 1, 2, 0, 2, 3};
    indices = Buffers.newDirectShortBuffer(indexArray.length);
    indices.put(indexArray);
    indices.flip();

    int[] temp = new int[3];
    gl.glGenBuffers(3, temp, 0);

    VAOTextures = temp[0];
    gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, VAOTextures);
    gl.glBufferData(GL2.GL_ELEMENT_ARRAY_BUFFER, textures.capacity() * Buffers.SIZEOF_FLOAT, textures, GL2.GL_STATIC_DRAW);
    gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, 0);

    VAOVertices = temp[1];
    gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, VAOVertices);
    gl.glBufferData(GL2.GL_ARRAY_BUFFER, vertices.capacity() * Buffers.SIZEOF_FLOAT, vertices, GL2.GL_STATIC_DRAW);
    gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, 0);

    VAOIndices = temp[2];
    gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, VAOIndices);
    gl.glBufferData(GL2.GL_ELEMENT_ARRAY_BUFFER, indices.capacity() * Buffers.SIZEOF_SHORT,  indices, GL2.GL_STATIC_DRAW);
    gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, 0);
}

protected void CBindTexture(GL2 gl){
    if (mTexture != CUtils.CurrentTexture){
        if (mTexture != null){
            CAssets.CWGGetTexture(mTexture).enable(gl);
            CAssets.CWGGetTexture(mTexture).bind(gl);
        }
        CUtils.CurrentTexture = mTexture;
    }
}
}

For the record: my vcard reports to have OpenGl 4.3.0 with (obviously) VAO support. Immediate rendering with textures is working fine.

I would really appreciate any kind of help. Many thanks in advance.

Answer 1

Check your texture coordinates.

If that does not work, check that you have set vertex color to white (so it will display colors as they show in the texture).