/// <summary>
/// Sets all properties of the given token so that it describes the current position
/// within this instance.
/// </summary>
public BatchToken FillToken(BatchToken token)
{
token.BatchID = _cacheToken.BatchID;
token.VertexID = _cacheToken.VertexID;
token.IndexID = _cacheToken.IndexID;
return(token);
}
/// <summary>
/// Restores the render state that was last pushed to the stack. If this changes
/// blend mode, clipping rectangle, render target or culling, the current batch
/// will be drawn right away.
///
/// <para>If you pass a BatchToken, it will be updated to point to the current location within
/// the render cache. That way, you can later reference this location to render a subset of
/// the cache.</para>
/// </summary>
/// <exception cref="IndexOutOfRangeException">if the state stack is empty</exception>
public void PopState(BatchToken token = null)
{
if (_stateStackPos < 0)
{
throw new IndexOutOfRangeException("Cannot pop empty state stack");
}
_state.CopyFrom(_stateStack[_stateStackPos]); // -> might cause 'finishMeshBatch'
_stateStackPos--;
if (token != null)
{
_batchProcessor.FillToken(token);
}
}
// state stack
/// <summary>
/// Pushes the current render state to a stack from which it can be restored later.
///
/// <para>If you pass a BatchToken, it will be updated to point to the current location within
/// the render cache. That way, you can later reference this location to render a subset of
/// the cache.</para>
/// </summary>
public void PushState(BatchToken token = null)
{
_stateStackPos++;
if (_stateStackLength < _stateStackPos + 1)
{
_stateStackLength++;
_stateStack.Add(new RenderState());
}
if (token != null)
{
_batchProcessor.FillToken(token);
}
_stateStack[_stateStackPos].CopyFrom(_state);
}
/// <summary>
/// Draws all meshes from the render cache between <code>startToken</code> and
/// (but not including) <code>endToken</code>. The render cache contains all meshes
/// rendered in the previous frame.
/// </summary>
public void DrawFromCache(BatchToken startToken, BatchToken endToken)
{
MeshSubset subset = SMeshSubset;
if (!startToken.Equals(endToken))
{
PushState();
for (int i = startToken.BatchID; i <= endToken.BatchID; ++i)
{
var meshBatch = _batchProcessorPrev.GetBatchAt(i);
subset.SetTo(); // resets subset
if (i == startToken.BatchID)
{
subset.VertexId = startToken.VertexID;
subset.IndexId = startToken.IndexID;
subset.NumVertices = meshBatch.NumVertices - subset.VertexId;
subset.NumIndices = meshBatch.NumIndices - subset.IndexId;
}
if (i == endToken.BatchID)
{
subset.NumVertices = endToken.VertexID - subset.VertexId;
subset.NumIndices = endToken.IndexID - subset.IndexId;
}
if (subset.NumVertices != 0)
{
_state.Alpha = 1.0f;
_state.BlendMode = meshBatch.BlendMode;
_batchProcessor.AddMesh(meshBatch, _state, subset, true);
}
}
PopState();
}
}
/// <summary>
/// Creates a new batch processor.
/// </summary>
public BatchProcessor()
{
_batches = new List <MeshBatch>();
_batchPool = new BatchPool();
_cacheToken = new BatchToken();
}