/// <summary>
/// Draws a collection of instances. Requires an HLSL effect designed for hardware instancing.
/// </summary>
/// <param name="device"></param>
/// <param name="camera"></param>
/// <param name="instances"></param>
protected virtual void drawInstances(RenderParameters parameters, Matrix transform)
{
if (this.Instances.Length == 0)
{
return;
}
bool recalculate = this.instanceVertexBuffer == null || this.instanceVertexBuffer.IsContentLost || (parameters.IsMainRender && (this.instancesChanged || this.lastInstancesChanged));
if (recalculate)
{
// If we have more instances than room in our vertex buffer, grow it to the neccessary size.
if (this.instanceVertexBuffer == null || this.instanceVertexBuffer.IsContentLost || this.Instances.Length > this.instanceVertexBuffer.VertexCount)
{
if (this.instanceVertexBuffer != null)
{
this.instanceVertexBuffer.Dispose();
}
int bufferSize = (int)Math.Pow(2.0, Math.Ceiling(Math.Log(this.Instances.Length, 2.0)));
this.instanceVertexBuffer = new DynamicVertexBuffer
(
this.main.GraphicsDevice,
Model.instanceVertexDeclaration,
bufferSize,
BufferUsage.WriteOnly
);
InstanceVertex[] newData = new InstanceVertex[bufferSize];
if (this.instanceVertexData != null)
{
Array.Copy(this.instanceVertexData, newData, Math.Min(bufferSize, this.instanceVertexData.Length));
for (int i = this.instanceVertexData.Length; i < this.Instances.Length; i++)
{
newData[i].LastTransform = this.Instances[i].Transform;
}
}
this.instanceVertexData = newData;
}
for (int i = 0; i < this.Instances.Length; i++)
{
this.instanceVertexData[i].LastTransform = this.instanceVertexData[i].Transform;
Instance instance = this.Instances[i];
this.instanceVertexData[i].Transform = instance.Transform;
this.instanceVertexData[i].Param = instance.Param;
}
// Transfer the latest instance transform matrices into the instanceVertexBuffer.
this.instanceVertexBuffer.SetData <InstanceVertex>(this.instanceVertexData, 0, this.Instances.Length, SetDataOptions.Discard);
this.lastInstancesChanged = this.instancesChanged;
this.instancesChanged = false;
}
#if !MONOGAME // TODO: enable hardware instancing for MonoGame
// Set up the instance rendering effect.
if (this.setParameters(transform, parameters))
{
this.main.LightingManager.SetRenderParameters(this.effect, parameters);
RasterizerState originalState = this.main.GraphicsDevice.RasterizerState;
RasterizerState noCullState = null;
if (recalculate && this.DisableCulling)
{
noCullState = new RasterizerState {
CullMode = CullMode.None
};
this.main.GraphicsDevice.RasterizerState = noCullState;
}
for (int i = 0; i < this.model.Meshes.Count; i++)
{
ModelMesh mesh = this.model.Meshes[i];
for (int j = 0; j < mesh.MeshParts.Count; j++)
{
ModelMeshPart meshPart = mesh.MeshParts[j];
// Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
// TODO: Monogame support for GraphicsDevice.SetVertexBuffers()
this.main.GraphicsDevice.SetVertexBuffers
(
new VertexBufferBinding(meshPart.VertexBuffer, meshPart.VertexOffset, 0),
new VertexBufferBinding(instanceVertexBuffer, 0, 1)
);
this.main.GraphicsDevice.Indices = meshPart.IndexBuffer;
// Draw all the instance copies in a single call.
this.effect.CurrentTechnique.Passes[0].Apply();
// TODO: Monogame support for GraphicsDevice.DrawInstancedPrimitives()
this.main.GraphicsDevice.DrawInstancedPrimitives
(
PrimitiveType.TriangleList,
0,
0,
meshPart.NumVertices,
meshPart.StartIndex,
meshPart.PrimitiveCount,
this.Instances.Length
);
Model.DrawCallCounter++;
Model.TriangleCounter += meshPart.PrimitiveCount * this.Instances.Length;
}
}
if (noCullState != null)
{
this.main.GraphicsDevice.RasterizerState = originalState;
}
}
#endif
if (parameters.IsMainRender)
{
this.lastTransform = transform;
this.lastWorldViewProjection = transform * parameters.Camera.ViewProjection;
}
}
/// <summary>
/// Draws a collection of instances. Requires an HLSL effect designed for hardware instancing.
/// </summary>
/// <param name="device"></param>
/// <param name="camera"></param>
/// <param name="instances"></param>
protected virtual void drawInstances(RenderParameters parameters, Matrix transform)
{
if (this.Instances.Count == 0)
return;
bool recalculate = this.instanceVertexBuffer == null || this.instanceVertexBuffer.IsContentLost || (parameters.IsMainRender && (this.instancesChanged || this.lastInstancesChanged));
if (recalculate)
{
// If we have more instances than room in our vertex buffer, grow it to the neccessary size.
if (this.instanceVertexBuffer == null || this.instanceVertexBuffer.IsContentLost || this.Instances.Count > this.instanceVertexBuffer.VertexCount)
{
if (this.instanceVertexBuffer != null)
this.instanceVertexBuffer.Dispose();
int bufferSize = (int)Math.Pow(2.0, Math.Ceiling(Math.Log(this.Instances.Count, 2.0)));
this.instanceVertexBuffer = new DynamicVertexBuffer
(
this.main.GraphicsDevice,
Model.instanceVertexDeclaration,
bufferSize,
BufferUsage.WriteOnly
);
InstanceVertex[] newData = new InstanceVertex[bufferSize];
if (this.instanceVertexData != null)
{
Array.Copy(this.instanceVertexData, newData, Math.Min(bufferSize, this.instanceVertexData.Length));
for (int i = this.instanceVertexData.Length; i < this.Instances.Count; i++)
newData[i].LastTransform = this.Instances[i];
}
this.instanceVertexData = newData;
}
for (int i = 0; i < this.Instances.Count; i++)
{
this.instanceVertexData[i].LastTransform = this.instanceVertexData[i].Transform;
this.instanceVertexData[i].Transform = this.Instances[i];
this.instanceVertexData[i].InstanceIndex = i;
}
// Transfer the latest instance transform matrices into the instanceVertexBuffer.
this.instanceVertexBuffer.SetData<InstanceVertex>(this.instanceVertexData, 0, this.Instances.Count, SetDataOptions.Discard);
this.lastInstancesChanged = this.instancesChanged;
this.instancesChanged = false;
}
#if !MONOGAME // TODO: enable hardware instancing for MonoGame
// Set up the instance rendering effect.
if (this.setParameters(transform, parameters))
{
this.main.LightingManager.SetRenderParameters(this.effect, parameters);
RasterizerState originalState = this.main.GraphicsDevice.RasterizerState;
RasterizerState noCullState = null;
if (recalculate && this.DisableCulling)
{
noCullState = new RasterizerState { CullMode = CullMode.None };
this.main.GraphicsDevice.RasterizerState = noCullState;
}
foreach (ModelMesh mesh in this.model.Meshes)
{
foreach (ModelMeshPart meshPart in mesh.MeshParts)
{
// Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
// TODO: Monogame support for GraphicsDevice.SetVertexBuffers()
this.main.GraphicsDevice.SetVertexBuffers
(
new VertexBufferBinding(meshPart.VertexBuffer, meshPart.VertexOffset, 0),
new VertexBufferBinding(instanceVertexBuffer, 0, 1)
);
this.main.GraphicsDevice.Indices = meshPart.IndexBuffer;
// Draw all the instance copies in a single call.
foreach (EffectPass pass in this.effect.CurrentTechnique.Passes)
{
pass.Apply();
// TODO: Monogame support for GraphicsDevice.DrawInstancedPrimitives()
this.main.GraphicsDevice.DrawInstancedPrimitives
(
PrimitiveType.TriangleList,
0,
0,
meshPart.NumVertices,
meshPart.StartIndex,
meshPart.PrimitiveCount,
this.Instances.Count
);
}
}
}
if (noCullState != null)
this.main.GraphicsDevice.RasterizerState = originalState;
}
#endif
if (parameters.IsMainRender)
{
this.lastTransform = transform;
this.lastWorldViewProjection = transform * parameters.Camera.ViewProjection;
}
}
