/// <summary>
/// This method updates the connection data of skeleton points and is called when any frame is updated.
/// </summary>
/// <param name="handSkeletons">Bone point data of hand.</param>
/// <param name="handSkeletonConnection">Data of connection between bone points of hand.</param>
private void UpdateHandSkeletonLinesData(float[] handSkeletons, int[] handSkeletonConnection)
{
ShaderUtil.CheckGlError(TAG, "Update hand skeleton lines data start.");
int pointsLineNum = 0;
// Each point is a set of 3D coordinate. Each connection line consists of two points.
float[] linePoint = new float[handSkeletonConnection.Length * 3 * 2];
// The format of HandSkeletonConnection data is [p0,p1;p0,p3;p0,p5;p1,p2].
// handSkeletonConnection saves the node indexes. Two indexes obtain a set
// of connection point data. Therefore, j = j + 2. This loop obtains related
// coordinates and saves them in linePoint.
for (int j = 0; j < handSkeletonConnection.Length; j += 2)
{
linePoint[pointsLineNum * 3] = handSkeletons[3 * handSkeletonConnection[j]];
linePoint[pointsLineNum * 3 + 1] = handSkeletons[3 * handSkeletonConnection[j] + 1];
linePoint[pointsLineNum * 3 + 2] = handSkeletons[3 * handSkeletonConnection[j] + 2];
linePoint[pointsLineNum * 3 + 3] = handSkeletons[3 * handSkeletonConnection[j + 1]];
linePoint[pointsLineNum * 3 + 4] = handSkeletons[3 * handSkeletonConnection[j + 1] + 1];
linePoint[pointsLineNum * 3 + 5] = handSkeletons[3 * handSkeletonConnection[j + 1] + 2];
pointsLineNum += 2;
}
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, mVbo);
mPointsNum = pointsLineNum;
// If the storage space is insufficient, apply for twice the memory each time.
if (mVboSize < mPointsNum * BYTES_PER_POINT)
{
while (mVboSize < mPointsNum * BYTES_PER_POINT)
{
mVboSize *= 2;
}
GLES20.GlBufferData(GLES20.GlArrayBuffer, mVboSize, null, GLES20.GlDynamicDraw);
}
FloatBuffer linePoints = FloatBuffer.Wrap(linePoint);
Log.Debug(TAG, "Skeleton skeleton line points num: " + mPointsNum);
Log.Debug(TAG, "Skeleton line points: " + linePoints.ToString());
GLES20.GlBufferSubData(GLES20.GlArrayBuffer, 0, mPointsNum * BYTES_PER_POINT,
linePoints);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, 0);
ShaderUtil.CheckGlError(TAG, "Update hand skeleton lines data end.");
}