public GlobalRootSignature(ID3D12Device5 pDevice, RootSignatureDescription desc)
{
pRootSig = new Vortice.Direct3D12.GlobalRootSignature();
pRootSig.RootSignature = pDevice.CreateRootSignature(desc, RootSignatureVersion.Version1);
suboject = new StateSubObject(pRootSig);
}
public void CreateRtPipelineState()
{
var rtpipeline = new RTPipeline();
// Need 10 subobjects:
// 1 for the DXIL library
// 1 for hit-group
// 2 for RayGen root-signature (root-signature and the subobject association)
// 2 for the root-signature shared between miss and hit shaders (signature and association)
// 2 for shader config (shared between all programs. 1 for the config, 1 for association)
// 1 for pipeline config
// 1 for the global root signature
StateSubObject[] subobjects = new StateSubObject[10];
int index = 0;
// Create the DXIL library
DxilLibrary dxilLib = rtpipeline.CreateDxilLibrary();
subobjects[index++] = dxilLib.stateSubObject; // 0 Library
HitProgram hitProgram = new HitProgram(null, RTPipeline.kClosestHitShader, RTPipeline.kHitGroup);
subobjects[index++] = hitProgram.subObject; // 1 Hit Group
// Create the ray-gen root-signature and association
Structs.LocalRootSignature rgsRootSignature = new Structs.LocalRootSignature(mpDevice, rtpipeline.CreateRayGenRootDesc());
subobjects[index] = rgsRootSignature.subobject;
int rgsRootIndex = index++; // 2
ExportAssociation rgsRootAssociation = new ExportAssociation(new string[] { RTPipeline.kRayGenShader }, subobjects[rgsRootIndex]);
subobjects[index++] = rgsRootAssociation.subobject; // 3 Associate Root Sig to RGS
// Create the miss- and hit-programs root-signature and association
RootSignatureDescription emptyDesc = new RootSignatureDescription(RootSignatureFlags.LocalRootSignature);
Structs.LocalRootSignature hitMissRootSignature = new Structs.LocalRootSignature(mpDevice, emptyDesc);
subobjects[index] = hitMissRootSignature.subobject; // 4 Root Sig to be shared between Miss and CHS
int hitMissRootIndex = index++; // 4
string[] missHitExportName = new string[] { RTPipeline.kMissShader, RTPipeline.kClosestHitShader };
ExportAssociation missHitRootAssociation = new ExportAssociation(missHitExportName, subobjects[hitMissRootIndex]);
subobjects[index++] = missHitRootAssociation.subobject; // 5 Associate Root Sig to Miss and CHS
// Bind the payload size to the programs
ShaderConfig shaderConfig = new ShaderConfig(sizeof(float) * 2, sizeof(float) * 1);
subobjects[index] = shaderConfig.subObject; // 6 Shader Config;
int shaderConfigIndex = index++; // 6
string[] shaderExports = new string[] { RTPipeline.kMissShader, RTPipeline.kClosestHitShader, RTPipeline.kRayGenShader };
ExportAssociation configAssociation = new ExportAssociation(shaderExports, subobjects[shaderConfigIndex]);
subobjects[index++] = configAssociation.subobject; // 7 Associate Shader Config to Miss, CHS, RGS
// Create the pipeline config
PipelineConfig config = new PipelineConfig(0);
subobjects[index++] = config.suboject; // 8
// Create the global root signature and store the empty signature
Structs.GlobalRootSignature root = new Structs.GlobalRootSignature(mpDevice, new RootSignatureDescription());
mpEmptyRootSig = root.pRootSig;
subobjects[index++] = root.suboject; // 9
// Create the state
StateObjectDescription desc = new StateObjectDescription(StateObjectType.RaytracingPipeline, subobjects);
mpPipelineState = mpDevice.CreateStateObject(desc);
}
