/// <summary>
/// Function to return the draw call.
/// </summary>
/// <param name="allocator">The allocator used to create an instance of the object</param>
/// <returns>The draw call created or updated by this builder.</returns>
/// <exception cref="GorgonException">Thrown if a <see cref="GorgonVertexShader"/> is not assigned to the <see cref="GorgonPipelineState.VertexShader"/> property with the <see cref="PipelineState(GorgonPipelineStateBuilder)"/> command.</exception>
/// <remarks>
/// <para>
/// Using an <paramref name="allocator"/> can provide different strategies when building draw calls. If omitted, the draw call will be created using the standard <see langword="new"/> keyword.
/// </para>
/// <para>
/// A custom allocator can be beneficial because it allows us to use a pool for allocating the objects, and thus allows for recycling of objects. This keeps the garbage collector happy by keeping objects
/// around for as long as we need them, instead of creating objects that can potentially end up in the large object heap or in Gen 2.
/// </para>
/// <para>
/// A draw call requires that at least a vertex shader be bound. If none is present, then the method will throw an exception.
/// </para>
/// </remarks>
public TDc Build(GorgonDrawCallPoolAllocator <TDc> allocator)
{
TDc final = OnCreate(allocator);
if ((allocator == null) ||
(final.VertexShader.ConstantBuffers == null) ||
(final.PixelShader.Samplers == null) ||
(final.PixelShader.ShaderResources == null))
{
final.SetupConstantBuffers();
final.SetupSamplers();
final.SetupViews();
}
if (final.D3DState.VertexBuffers == null)
{
final.D3DState.VertexBuffers = new GorgonVertexBufferBindings();
}
if (final.D3DState.StreamOutBindings == null)
{
final.D3DState.StreamOutBindings = new GorgonStreamOutBindings();
}
StateCopy.CopyVertexBuffers(final.D3DState.VertexBuffers, DrawCall.VertexBufferBindings, DrawCall.InputLayout);
StateCopy.CopyStreamOutBuffers(final.D3DState.StreamOutBindings, DrawCall.StreamOutBufferBindings);
// Copy over the shader resources.
if (DrawCall.D3DState.PipelineState?.PixelShader != null)
{
StateCopy.CopyConstantBuffers(final.D3DState.PsConstantBuffers, DrawCall.D3DState.PsConstantBuffers, 0);
StateCopy.CopySamplers(final.D3DState.PsSamplers, DrawCall.D3DState.PsSamplers, 0);
StateCopy.CopySrvs(final.D3DState.PsSrvs, DrawCall.D3DState.PsSrvs);
}
else
{
final.D3DState.PsConstantBuffers.Clear();
final.D3DState.PsSamplers.Clear();
final.D3DState.PsSrvs.Clear();
}
if (DrawCall.D3DState.PipelineState?.VertexShader != null)
{
StateCopy.CopyConstantBuffers(final.D3DState.VsConstantBuffers, DrawCall.D3DState.VsConstantBuffers, 0);
StateCopy.CopySamplers(final.D3DState.VsSamplers, DrawCall.D3DState.VsSamplers, 0);
StateCopy.CopySrvs(final.D3DState.VsSrvs, DrawCall.D3DState.VsSrvs);
}
else
{
final.D3DState.VsConstantBuffers.Clear();
final.D3DState.VsSamplers.Clear();
final.D3DState.VsSrvs.Clear();
}
if (DrawCall.D3DState.PipelineState?.GeometryShader != null)
{
StateCopy.CopyConstantBuffers(final.D3DState.GsConstantBuffers, DrawCall.D3DState.GsConstantBuffers, 0);
StateCopy.CopySamplers(final.D3DState.GsSamplers, DrawCall.D3DState.GsSamplers, 0);
StateCopy.CopySrvs(final.D3DState.GsSrvs, DrawCall.D3DState.GsSrvs);
}
else
{
final.D3DState.GsConstantBuffers.Clear();
final.D3DState.GsSamplers.Clear();
final.D3DState.GsSrvs.Clear();
}
if (DrawCall.D3DState.PipelineState?.DomainShader != null)
{
StateCopy.CopyConstantBuffers(final.D3DState.DsConstantBuffers, DrawCall.D3DState.DsConstantBuffers, 0);
StateCopy.CopySamplers(final.D3DState.DsSamplers, DrawCall.D3DState.DsSamplers, 0);
StateCopy.CopySrvs(final.D3DState.DsSrvs, DrawCall.D3DState.DsSrvs);
}
else
{
final.D3DState.DsConstantBuffers.Clear();
final.D3DState.DsSamplers.Clear();
final.D3DState.DsSrvs.Clear();
}
if (DrawCall.D3DState.PipelineState?.HullShader != null)
{
StateCopy.CopyConstantBuffers(final.D3DState.HsConstantBuffers, DrawCall.D3DState.HsConstantBuffers, 0);
StateCopy.CopySamplers(final.D3DState.HsSamplers, DrawCall.D3DState.HsSamplers, 0);
StateCopy.CopySrvs(final.D3DState.HsSrvs, DrawCall.D3DState.HsSrvs);
}
else
{
final.D3DState.HsConstantBuffers.Clear();
final.D3DState.HsSamplers.Clear();
final.D3DState.HsSrvs.Clear();
}
// Copy over unordered access views.
StateCopy.CopyReadWriteViews(final.D3DState.ReadWriteViews, DrawCall.D3DState.ReadWriteViews, 0);
final.D3DState.PipelineState = DrawCall.PipelineState;
// Copy the cached states.
final.PipelineState.D3DBlendState = DrawCall.PipelineState.D3DBlendState;
final.PipelineState.D3DDepthStencilState = DrawCall.PipelineState.D3DDepthStencilState;
final.PipelineState.D3DRasterState = DrawCall.PipelineState.D3DRasterState;
OnUpdate(final);
if (final.PipelineState.VertexShader == null)
{
throw new GorgonException(GorgonResult.CannotCreate, Resources.GORGFX_ERR_NO_VERTEX_SHADER);
}
return(final);
}
/// <summary>
/// Function to set the vertex buffer bindings for the draw call.
/// </summary>
/// <param name="layout">The input layout to use.</param>
/// <param name="bindings">The vertex buffer bindings to set.</param>
/// <returns>The fluent builder interface.</returns>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="layout"/> parameter is <b>null</b>.</exception>
public TB VertexBuffers(GorgonInputLayout layout, IReadOnlyList <GorgonVertexBufferBinding> bindings)
{
StateCopy.CopyVertexBuffers(DrawCall.D3DState.VertexBuffers, bindings, layout ?? throw new ArgumentNullException(nameof(layout)));
return((TB)this);
}
