/// <summary>
/// Determines if two batches can be merged into a single batch.
/// </summary>
private static bool CanMerge(ref PrimitiveGroupEntry oldBatch, ref PrimitiveGroupEntry newBatch)
{
if (oldBatch.PrimitiveType != newBatch.PrimitiveType)
{
return(false);
}
if (oldBatch.LineWidth != newBatch.LineWidth)
{
return(false);
}
if (oldBatch.PrimitiveType != PrimitiveType.LineList && oldBatch.PrimitiveType != PrimitiveType.TriangleList)
{
return(false);
}
if (oldBatch.Texture != newBatch.Texture)
{
return(false);
}
if (oldBatch.World.HasValue || newBatch.World.HasValue)
{
return(false);
}
if ((oldBatch.IndexCount > 0 && newBatch.IndexCount == 0) || (oldBatch.IndexCount == 0 && newBatch.IndexCount > 0))
{
return(false);
}
return(true);
}
/// <summary>
/// Begins a new primitive.
/// </summary>
#if WINDOWS_PHONE
/// <param name="lineWidth">This value will always be 1 on Windows Phone.</param>
#endif
public void BeginPrimitive(PrimitiveType primitiveType, Texture2D texture, Matrix?world, float lineWidth)
{
if (hasPrimitiveBegin)
{
throw new InvalidOperationException("Begin cannot be called until End has been successfully called.");
}
hasPrimitiveBegin = true;
currentPrimitive = new PrimitiveGroupEntry();
currentPrimitive.LineWidth = lineWidth;
currentPrimitive.World = world;
currentPrimitive.PrimitiveType = primitiveType;
currentPrimitive.Texture = texture;
currentPrimitive.StartVertex = currentVertex;
currentPrimitive.StartIndex = currentIndex;
currentBaseVertex = currentVertex;
currentBaseIndex = currentIndex;
beginSegment = currentSegment;
#if !WINDOWS_PHONE
lineIndices.Clear();
currentLineVertex = 0;
lastLineVertex = -1;
#endif
}
private void DrawBatch(DrawingContext context, ref PrimitiveGroupEntry entry, Material material)
{
if (entry.VertexCount <= 0 && entry.IndexCount <= 0)
{
return;
}
material.texture = entry.Texture;
material.world = entry.World.HasValue ? entry.World.Value * AbsoluteTransform : AbsoluteTransform;
material.BeginApply(context);
#if !WINDOWS_PHONE
if (entry.LineWidth > 0)
{
if (thickLineMaterial == null)
{
thickLineMaterial = new ThickLineMaterial(graphics);
}
thickLineMaterial.Thickness = entry.LineWidth;
thickLineMaterial.world = material.world;
thickLineMaterial.BeginApply(context);
}
#endif
var vertexBufferSize = vertexSegments[entry.Segment + 1] - vertexSegments[entry.Segment];
#if SILVERLIGHT
if (vertexBuffer == null || vertexBuffer.VertexCount < vertexBufferSize)
#else
if (vertexBuffer == null || vertexBuffer.VertexCount < vertexBufferSize || vertexBuffer.IsContentLost)
#endif
{
if (vertexBuffer != null)
{
vertexBuffer.Dispose();
}
vertexBuffer = new DynamicVertexBuffer(graphics, typeof(VertexPositionColorNormalTexture), Math.Max(initialBufferCapacity, vertexBufferSize), BufferUsage.WriteOnly);
}
context.SetVertexBuffer(null, 0);
vertexBuffer.SetData(vertexData, vertexSegments[entry.Segment], vertexBufferSize, SetDataOptions.Discard);
// Previous segments are not used, so use SetDataOption.Discard to boost performance.
context.SetVertexBuffer(vertexBuffer, 0);
if (entry.IndexCount > 0)
{
var indexBufferSize = indexSegments[entry.Segment + 1] - indexSegments[entry.Segment];
#if SILVERLIGHT
if (indexBuffer == null || indexBuffer.IndexCount < indexBufferSize)
#else
if (indexBuffer == null || indexBuffer.IndexCount < indexBufferSize || indexBuffer.IsContentLost)
#endif
{
if (indexBuffer != null)
{
indexBuffer.Dispose();
}
indexBuffer = new DynamicIndexBuffer(graphics, IndexElementSize.SixteenBits, Math.Max(initialBufferCapacity, indexBufferSize), BufferUsage.WriteOnly);
}
graphics.Indices = null;
indexBuffer.SetData(indexData, indexSegments[entry.Segment], indexBufferSize, SetDataOptions.Discard);
var primitiveCount = Helper.GetPrimitiveCount(entry.PrimitiveType, entry.IndexCount);
graphics.Indices = indexBuffer;
graphics.DrawIndexedPrimitives(entry.PrimitiveType, 0, entry.StartVertex, entry.VertexCount, entry.StartIndex, primitiveCount);
}
else
{
var primitiveCount = Helper.GetPrimitiveCount(entry.PrimitiveType, entry.VertexCount);
graphics.DrawPrimitives(entry.PrimitiveType, entry.StartVertex, primitiveCount);
}
material.EndApply(context);
}
