private int DrawBatch(Xen.Graphics.VerticesGroup vertices, Graphics.IIndices indices, PrimitiveType primitiveType, int count)
{
if (frequency == null)
{
frequency = new Xen.Graphics.StreamFrequency(vertices, Xen.Graphics.StreamFrequency.DataLayout.Stream0Geometry_Stream1InstanceData);
}
frequency.RepeatCount = count;
vertices.Draw(this, indices, primitiveType, frequency);
return(count);
}
/// <summary>
/// Draw the vertices group as primitives, using an optional index buffer (indices) and a <see cref="StreamFrequency"/> object to specify Hardware Instancing information (Shader Model 3 and Windows Only)
/// </summary>
/// <param name="state"></param>
/// <param name="indices">(optional) indices to use during drawing</param>
/// <param name="primitiveType">Primitive type to draw, eg PrimitiveType.TriangleList</param>
/// <param name="frequency">(optional) <see cref="StreamFrequency"/> setting the shader model 3 instance frequency data (used for hardware instancing)</param>
/// <param name="primitveCount">The number of primitives to draw</param>
/// <param name="startIndex">The start index in the index buffer (defaults to the first index - 0)</param>
/// <param name="vertexOffset">Starting offset into the vertex buffer (defaults to the first vertex - 0)</param>
/// <remarks></remarks>
public void Draw(DrawState state, IIndices indices, PrimitiveType primitiveType, StreamFrequency frequency, int primitveCount, int startIndex, int vertexOffset)
{
if (frequency != null && !state.SupportsHardwareInstancing)
{
throw new InvalidOperationException("Only windows devices supporting Shader Model 3.0 or better to can use hardware instancing. Check DrawState.SupportsHardwareInstancing");
}
#if XBOX360
if (frequency != null)
{
#if DEBUG
if (frequency.layout != StreamFrequency.DataLayout.Stream0Geometry_Stream1InstanceData)
{
throw new InvalidOperationException("Only StreamFrequency DataLayout of Stream0Geometry_Stream1InstanceData is emulated on the xbox360");
}
if (primitveCount != int.MaxValue ||
startIndex != 0 || vertexOffset != 0)
{
throw new ArgumentException("Only default values for primitiveCount, startIndex and vertexOffset may be used when emulating instancing on the xbox");
}
if (primitiveType == PrimitiveType.TriangleFan ||
primitiveType == PrimitiveType.TriangleStrip ||
primitiveType == PrimitiveType.LineStrip)
{
throw new ArgumentException("Only Primitive List Types (eg TriangleList) are supported as a primitiveType when emulating instancing on the xbox");
}
#endif
if (indices != null)
{
((IDeviceIndexBuffer)indices).AllocateForInstancing(state);
}
}
#endif
GraphicsDevice device = state.graphics;
IDeviceIndexBuffer devib = indices as IDeviceIndexBuffer;
IndexBuffer ib = null;
if (devib != null)
{
ib = devib.GetIndexBuffer(state);
}
if (decl == null)
{
decl = ((IDeviceVertexBuffer)this).GetVertexDeclaration(state.Application);
}
state.VertexDeclaration = decl;
#if DEBUG
state.ValidateVertexDeclarationForShader(decl, null);
#endif
int vertices = 0;
for (int i = 0; i < buffers.Length; i++)
{
IDeviceVertexBuffer dev = buffers[i] as IDeviceVertexBuffer;
if (dev != null)
{
state.SetStream(i, dev.GetVertexBuffer(state), offsets[i], buffers[i].Stride);
}
else
{
state.SetStream(i, null, 0, 0);
}
if (i == 0)
{
vertices = buffers[i].Count;
}
else
if (frequency == null)
{
vertices = Math.Min(buffers[i].Count, vertices);
}
}
state.IndexBuffer = ib;
if (ib != null)
{
vertices = indices.Count;
}
int primitives = 0;
switch (primitiveType)
{
case PrimitiveType.LineList:
primitives = vertices / 2;
break;
case PrimitiveType.LineStrip:
primitives = vertices - 1;
break;
case PrimitiveType.PointList:
primitives = vertices;
break;
case PrimitiveType.TriangleList:
primitives = vertices / 3;
break;
case PrimitiveType.TriangleFan:
case PrimitiveType.TriangleStrip:
primitives = vertices - 2;
break;
}
int vertexCount = 0;
if (indices != null)
{
vertexCount = indices.MaxIndex + 1;
}
else
{
switch (primitiveType)
{
case PrimitiveType.LineStrip:
vertexCount = primitives * 2;
break;
case PrimitiveType.PointList:
case PrimitiveType.LineList:
case PrimitiveType.TriangleList:
vertexCount = vertices;
break;
case PrimitiveType.TriangleFan:
case PrimitiveType.TriangleStrip:
vertexCount = primitives * 3;
break;
}
}
state.ApplyRenderStateChanges(vertexCount);
#if DEBUG
int instances = 1;
#endif
#if !XBOX360
if (frequency != null && frequency.frequency.Length >= this.buffers.Length)
{
#if DEBUG
if (frequency.indexFrequency.Length > 0)
{
System.Threading.Interlocked.Increment(ref state.Application.currentFrame.InstancesDrawBatchCount);
state.Application.currentFrame.InstancesDrawn += frequency.indexFrequency[0];
instances = frequency.indexFrequency[0];
}
#endif
for (int i = 0; i < this.buffers.Length; i++)
{
VertexStream vs = device.Vertices[i];
if (frequency.frequency[i] != 0)
{
vs.SetFrequency(frequency.frequency[i]);
}
if (frequency.indexFrequency[i] != 0)
{
vs.SetFrequencyOfIndexData(frequency.indexFrequency[i]);
}
if (frequency.dataFrequency[i] != 0)
{
vs.SetFrequencyOfInstanceData(frequency.dataFrequency[i]);
}
}
}
#endif
if (primitveCount != int.MaxValue)
{
if (primitveCount > primitives ||
primitveCount <= 0)
{
throw new ArgumentException("primitiveCount");
}
}
else
{
primitveCount = primitives;
}
#if DEBUG
state.CalcBoundTextures();
#endif
//it is possible to have the debug runtime throw an exception here when using instancing,
//as it thinks stream1 doesn't have enough data.
//This is most common with sprite groups (however sprite groups will use shader-instancing with small groups)
//eg, drawing a single instance requires only 64bytes in stream1, yet the triangle count could be very large
//this makes the debug runtime think that stream1 doesn't have enough data
if (ib != null)
{
#if DEBUG
System.Threading.Interlocked.Increment(ref state.Application.currentFrame.DrawIndexedPrimitiveCallCount);
#endif
#if XBOX360
if (frequency != null)
{
int repeats = frequency.RepeatCount;
#if DEBUG
System.Threading.Interlocked.Increment(ref state.Application.currentFrame.InstancesDrawBatchCount);
state.Application.currentFrame.InstancesDrawn += frequency.indexFrequency[0];
instances = repeats;
#endif
int maxInstances = ((IDeviceIndexBuffer)indices).MaxInstances;
int offset = 0;
VertexBuffer vb = ((IDeviceVertexBuffer)buffers[1]).GetVertexBuffer(state);
while (repeats - offset > 0)
{
if (offset != 0)
{
//read the next set of instances
state.SetStream(1, vb, offsets[1] + 64 * offset, buffers[1].Stride);
}
int count = Math.Min(repeats - offset, maxInstances);
device.DrawIndexedPrimitives(primitiveType, vertexOffset, indices.MinIndex, ((indices.MaxIndex) + 1) - indices.MinIndex - vertexOffset, startIndex, primitveCount * count);
offset += count;
}
}
else
#endif
device.DrawIndexedPrimitives(primitiveType, vertexOffset, indices.MinIndex, (indices.MaxIndex - indices.MinIndex) + 1 - vertexOffset, startIndex, primitveCount);
}
else
{
#if DEBUG
System.Threading.Interlocked.Increment(ref state.Application.currentFrame.DrawPrimitivesCallCount);
#endif
#if XBOX360
if (frequency != null)
{
int repeats = frequency.RepeatCount;
int maxInstances = ((IDeviceIndexBuffer)indices).MaxInstances;
int offset = 0;
VertexBuffer vb = ((IDeviceVertexBuffer)buffers[1]).GetVertexBuffer(state);
while (repeats - offset > 0)
{
if (offset != 0)
{
//read the next set of instances
state.SetStream(1, vb, offsets[1] + 64 * offset, buffers[1].Stride);
}
int count = Math.Min(repeats - offset, maxInstances);
device.DrawPrimitives(primitiveType, vertexOffset, primitveCount * count);
offset += count;
}
}
else
#endif
device.DrawPrimitives(primitiveType, vertexOffset, primitveCount);
}
#if DEBUG
switch (primitiveType)
{
case PrimitiveType.LineList:
case PrimitiveType.LineStrip:
state.Application.currentFrame.LinesDrawn += primitives * instances;
break;
case PrimitiveType.PointList:
state.Application.currentFrame.PointsDrawn += primitives * instances;
break;
case PrimitiveType.TriangleList:
case PrimitiveType.TriangleFan:
case PrimitiveType.TriangleStrip:
state.Application.currentFrame.TrianglesDrawn += primitives * instances;
break;
}
#endif
#if !XBOX360
if (frequency != null && frequency.frequency.Length >= this.buffers.Length)
{
device.Vertices[0].SetFrequency(1);
}
#endif
for (int i = 0; i < buffers.Length; i++)
{
if (i > 0)
{
state.SetStream(i, null, 0, 0);
}
}
}
/// <summary>
/// Draw the vertices group as primitives, using an optional index buffer (indices) and a <see cref="StreamFrequency"/> object to specify Hardware Instancing information (Shader Model 3 and Windows Only)
/// </summary>
/// <param name="state"></param>
/// <param name="indices">(optional) indices to use during drawing</param>
/// <param name="primitiveType">Primitive type to draw, eg PrimitiveType.TriangleList</param>
/// <param name="frequency">(optional) <see cref="StreamFrequency"/> setting the shader model 3 instance frequency data (used for hardware instancing)</param>
/// <remarks></remarks>
public void Draw(DrawState state, IIndices indices, PrimitiveType primitiveType, StreamFrequency frequency)
{
Draw(state, indices, primitiveType, frequency, int.MaxValue, 0, 0);
}