private static void UpdateBuffer(UIItem item)
{
if (item.Visible)
{
Queue <UIRenderData>[] data = { new Queue <UIRenderData>(), new Queue <UIRenderData>(), new Queue <UIRenderData>() };
foreach (UIRenderData renderData in item.ConstructVertexData())
{
data[renderData.Depth].Enqueue(renderData);
}
for (int d = 0; d < 3; d++)
{
Queue <UIRenderData> queue = data[d];
int verticies = queue.Count * 8;
int position, index = FindCurrentIndex(item, d, out position);
int delta = verticies - ((index == -1) ? 0 : indexUsage[d][index].Item2);
if (delta != 0)
{
// create space
int oldend = position + ((index == -1) ? 0 : indexUsage[d][index].Item2), newend = position + verticies, length = Math.Max(oldend, newend);
Array.Copy(vertexBuffer.Cache, oldend, vertexBuffer.Cache, newend, vertexBuffer.Cache.Length - length);
Array.Copy(textureBuffer.Cache, oldend, textureBuffer.Cache, newend, textureBuffer.Cache.Length - length);
Array.Copy(colorBuffer.Cache, oldend * 2, colorBuffer.Cache, newend * 2, colorBuffer.Cache.Length - length * 2);
}
if (index != -1)
{
indexUsage[d][index] = new Tuple <UIItem, int>(item, verticies);
}
else
{
indexUsage[d].Add(new Tuple <UIItem, int>(item, verticies));
}
vertexCount += delta;
renderCount += delta * 6 / 8;
while (queue.Count > 0)
{
UIRenderData renderData = queue.Dequeue();
Array.Copy(renderData.Verticies, 0, vertexBuffer.Cache, position, 8);
Array.Copy(Texture[renderData.Texture], 0, textureBuffer.Cache, position, 8);
Array.Copy(renderData.Color.ToArray4(), 0, colorBuffer.Cache, position * 2, 16);
position += 8;
}
for (int di = d; di < 3; di++)
{
startPositions[di] += delta;
}
}
}
else
{
int index;
int position;
for (int d = 0; d < 3; d++)
{
index = FindCurrentIndex(item, d, out position);
if (index > -1)
{
int verticiesToClear = indexUsage[d][index].Item2;
indexUsage[d].RemoveAt(index);
vertexCount -= verticiesToClear;
renderCount -= verticiesToClear * 6 / 8;
for (int di = d; di < 3; di++)
{
startPositions[di] -= verticiesToClear;
}
int end = position + verticiesToClear;
Array.Copy(vertexBuffer.Cache, end, vertexBuffer.Cache, position, vertexBuffer.Cache.Length - end);
Array.Copy(textureBuffer.Cache, end, textureBuffer.Cache, position, textureBuffer.Cache.Length - end);
Array.Copy(colorBuffer.Cache, end * 2, colorBuffer.Cache, position * 2, colorBuffer.Cache.Length - end * 2);
}
}
}
}