109 lines
3.8 KiB
HLSL
109 lines
3.8 KiB
HLSL
#ifndef _UNIFIEDRAYTRACING_TRACERAY_HLSL_
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#define _UNIFIEDRAYTRACING_TRACERAY_HLSL_
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#include "Packages/com.unity.rendering.light-transport/Runtime/UnifiedRayTracing/Bindings.hlsl"
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namespace UnifiedRT {
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static const uint kRayFlagNone = 0x0;
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static const uint kRayFlagCullBackFacingTriangles = 0x10;
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static const uint kRayFlagCullFrontFacingTriangles = 0x20;
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#if defined(UNIFIED_RT_BACKEND_HARDWARE)
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Hit TraceRayClosestHit(DispatchInfo dispatchInfo, RayTracingAccelStruct accelStruct, uint instanceMask, Ray ray, uint rayFlags)
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{
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RayDesc rayDesc;
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rayDesc.Origin = ray.origin;
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rayDesc.TMin = ray.tMin;
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rayDesc.Direction = ray.direction;
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rayDesc.TMax = ray.tMax;
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Hit payload;
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TraceRay(accelStruct.accelStruct, RAY_FLAG_FORCE_OPAQUE | rayFlags, instanceMask, 0, 1, 0, rayDesc, payload);
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return payload;
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}
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bool TraceRayAnyHit(DispatchInfo dispatchInfo, RayTracingAccelStruct accelStruct, uint instanceMask, Ray ray, uint rayFlags)
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{
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RayDesc rayDesc;
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rayDesc.Origin = ray.origin;
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rayDesc.TMin = ray.tMin;
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rayDesc.Direction = ray.direction;
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rayDesc.TMax = ray.tMax;
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Hit payLoadShadow = (Hit)0;
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TraceRay(accelStruct.accelStruct, RAY_FLAG_SKIP_CLOSEST_HIT_SHADER | RAY_FLAG_FORCE_OPAQUE | RAY_FLAG_ACCEPT_FIRST_HIT_AND_END_SEARCH | rayFlags, instanceMask, 0, 1, 0, rayDesc, payLoadShadow);
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return payLoadShadow.IsValid();
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}
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#elif defined(UNIFIED_RT_BACKEND_COMPUTE)
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int GetCullMode(uint rayFlags)
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{
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int cullMode = CULL_MODE_NONE;
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if (rayFlags & kRayFlagCullFrontFacingTriangles)
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cullMode = CULL_MODE_FRONTFACE;
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if (rayFlags & kRayFlagCullBackFacingTriangles)
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cullMode = CULL_MODE_BACKFACE;
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return cullMode;
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}
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Hit TraceRayClosestHit(DispatchInfo dispatchInfo, RayTracingAccelStruct accelStruct, uint instanceMask, Ray ray, uint rayFlags)
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{
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TraceParams traceParams;
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traceParams.bvh = accelStruct.bvh;
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traceParams.bottom_bvhs = accelStruct.bottom_bvhs;
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traceParams.bottom_bvh_leaves = accelStruct.bottom_bvh_leaves;
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traceParams.stack = g_stack;
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traceParams.instance_infos = accelStruct.instance_infos;
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traceParams.globalThreadIndex = dispatchInfo.globalThreadIndex;
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traceParams.localThreadIndex = dispatchInfo.localThreadIndex;
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traceParams.bottom_bvhs_vertices = accelStruct.vertexBuffer;
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traceParams.bottom_bvhs_vertex_stride = accelStruct.vertexStride;
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int cull_mode = GetCullMode(rayFlags);
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TraceHitResult hitData = TraceRaySoftware(traceParams, ray.origin, ray.tMin, ray.direction, ray.tMax, instanceMask, cull_mode, true);
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Hit res;
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res.instanceID = hitData.inst_id != -1 ? GetUserInstanceID(traceParams, hitData.inst_id) : -1;
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res.primitiveIndex = hitData.prim_id;
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res.uvBarycentrics = hitData.uv;
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res.hitDistance = hitData.hit_distance;
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res.isFrontFace = hitData.front_face;
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return res;
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}
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bool TraceRayAnyHit(DispatchInfo dispatchInfo, RayTracingAccelStruct accelStruct, uint instanceMask, Ray ray, uint rayFlags)
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{
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TraceParams traceParams;
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traceParams.bvh = accelStruct.bvh;
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traceParams.bottom_bvhs = accelStruct.bottom_bvhs;
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traceParams.bottom_bvh_leaves = accelStruct.bottom_bvh_leaves;
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traceParams.stack = g_stack;
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traceParams.instance_infos = accelStruct.instance_infos;
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traceParams.globalThreadIndex = dispatchInfo.globalThreadIndex;
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traceParams.localThreadIndex = dispatchInfo.localThreadIndex;
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traceParams.bottom_bvhs_vertices = accelStruct.vertexBuffer;
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traceParams.bottom_bvhs_vertex_stride = accelStruct.vertexStride;
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int cull_mode = GetCullMode(rayFlags);
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TraceHitResult hit = TraceRaySoftware(traceParams, ray.origin, ray.tMin, ray.direction, ray.tMax, instanceMask, cull_mode, false);
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return hit.inst_id != INVALID_NODE;
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}
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#endif
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} // namespace UnifiedRT
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#endif // UNIFIEDRAYTRACING_TRACERAY_HLSL
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