85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
// Copyright Epic Games, Inc. All Rights Reserved.
|
|
|
|
/*================================================================================================
|
|
RayTracingBuiltInResources.h: used in ray tracing shaders and C++ code to define resources
|
|
available in all hit groups, such as root nostants, index and vertex buffers.
|
|
!!! Changing this file requires recompilation of the engine !!!
|
|
=================================================================================================*/
|
|
|
|
#pragma once
|
|
|
|
#include "RayTracingDefinitions.h"
|
|
#include "HLSLReservedSpaces.h"
|
|
|
|
#if defined(__cplusplus)
|
|
#define INCLUDED_FROM_CPP_CODE 1
|
|
#define INCLUDED_FROM_HLSL_CODE 0
|
|
#else
|
|
#define INCLUDED_FROM_CPP_CODE 0
|
|
#define INCLUDED_FROM_HLSL_CODE 1
|
|
#endif
|
|
|
|
#if INCLUDED_FROM_HLSL_CODE
|
|
#define UINT_TYPE uint
|
|
#elif INCLUDED_FROM_CPP_CODE
|
|
#define UINT_TYPE unsigned int
|
|
#endif
|
|
|
|
struct FHitGroupSystemRootConstants
|
|
{
|
|
// Config is a bitfield:
|
|
// uint IndexStride : 8; // Can be just 1 bit to indicate 16 or 32 bit indices
|
|
// uint VertexStride : 8; // Can be just 2 bits to indicate float3, float2 or half2 format
|
|
// uint Unused : 16;
|
|
UINT_TYPE Config;
|
|
|
|
// Offset into HitGroupSystemIndexBuffer
|
|
UINT_TYPE IndexBufferOffsetInBytes;
|
|
|
|
// First primitive of the segment (as set in FRayTracingGeometrySegment)
|
|
UINT_TYPE FirstPrimitive;
|
|
|
|
// User-provided constant assigned to the hit group
|
|
UINT_TYPE UserData;
|
|
|
|
// Helper functions
|
|
|
|
UINT_TYPE GetIndexStride()
|
|
{
|
|
return Config & 0xFF;
|
|
}
|
|
|
|
UINT_TYPE GetVertexStride()
|
|
{
|
|
return (Config >> 8) & 0xFF;
|
|
}
|
|
|
|
#if INCLUDED_FROM_CPP_CODE
|
|
void SetVertexAndIndexStride(UINT_TYPE Vertex, UINT_TYPE Index)
|
|
{
|
|
Config = (Index & 0xFF) | ((Vertex & 0xFF) << 8);
|
|
}
|
|
#endif
|
|
};
|
|
|
|
#define RAY_TRACING_SYSTEM_INDEXBUFFER_REGISTER 0
|
|
#define RAY_TRACING_SYSTEM_VERTEXBUFFER_REGISTER 1
|
|
#define RAY_TRACING_SYSTEM_ROOTCONSTANT_REGISTER 0
|
|
|
|
#ifndef OVERRIDE_RAY_TRACING_HIT_GROUP_SYSTEM_RESOURCES
|
|
#define OVERRIDE_RAY_TRACING_HIT_GROUP_SYSTEM_RESOURCES 0
|
|
#endif
|
|
|
|
#if INCLUDED_FROM_HLSL_CODE && !OVERRIDE_RAY_TRACING_HIT_GROUP_SYSTEM_RESOURCES
|
|
// Built-in local root parameters that are always bound to all hit shaders
|
|
ByteAddressBuffer HitGroupSystemIndexBuffer : UE_HLSL_REGISTER(t, RAY_TRACING_SYSTEM_INDEXBUFFER_REGISTER, UE_HLSL_SPACE_RAY_TRACING_SYSTEM);
|
|
ByteAddressBuffer HitGroupSystemVertexBuffer : UE_HLSL_REGISTER(t, RAY_TRACING_SYSTEM_VERTEXBUFFER_REGISTER, UE_HLSL_SPACE_RAY_TRACING_SYSTEM);
|
|
ConstantBuffer<FHitGroupSystemRootConstants> HitGroupSystemRootConstants : UE_HLSL_REGISTER(b, RAY_TRACING_SYSTEM_ROOTCONSTANT_REGISTER, UE_HLSL_SPACE_RAY_TRACING_SYSTEM);
|
|
#endif
|
|
|
|
|
|
#undef INCLUDED_FROM_CPP_CODE
|
|
#undef INCLUDED_FROM_HLSL_CODE
|
|
#undef UINT_TYPE
|
|
|