// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "rtcore_device.h"

RTC_NAMESPACE_BEGIN
  
/* Forward declarations for ray structures */
struct RTCRayHit;
struct RTCRayHit4;
struct RTCRayHit8;
struct RTCRayHit16;

/* Scene flags */
enum RTCSceneFlags
{
  RTC_SCENE_FLAG_NONE                    = 0,
  RTC_SCENE_FLAG_DYNAMIC                 = (1 << 0),
  RTC_SCENE_FLAG_COMPACT                 = (1 << 1),
  RTC_SCENE_FLAG_ROBUST                  = (1 << 2),
  RTC_SCENE_FLAG_FILTER_FUNCTION_IN_ARGUMENTS = (1 << 3)
};

/* Additional arguments for rtcIntersect1/4/8/16 calls */
struct RTCIntersectArguments
{
  enum RTCRayQueryFlags flags;     // intersection flags
  enum RTCFeatureFlags feature_mask;       // selectively enable features for traversal
  struct RTCRayQueryContext* context;     // optional pointer to ray query context
  RTCFilterFunctionN filter;               // filter function to execute
  RTCIntersectFunctionN intersect;         // user geometry intersection callback to execute
#if RTC_MIN_WIDTH
  float minWidthDistanceFactor;            // curve radius is set to this factor times distance to ray origin
#endif
};

/* Initializes intersection arguments. */
RTC_FORCEINLINE void rtcInitIntersectArguments(struct RTCIntersectArguments* args)
{
  args->flags = RTC_RAY_QUERY_FLAG_INCOHERENT;
  args->feature_mask = RTC_FEATURE_FLAG_ALL;
  args->context = NULL;
  args->filter = NULL;
  args->intersect = NULL;

#if RTC_MIN_WIDTH
  args->minWidthDistanceFactor = 0.0f;
#endif
}

/* Additional arguments for rtcOccluded1/4/8/16 calls */
struct RTCOccludedArguments
{
  enum RTCRayQueryFlags flags;     // intersection flags
  enum RTCFeatureFlags feature_mask;       // selectively enable features for traversal
  struct RTCRayQueryContext* context;     // optional pointer to ray query context
  RTCFilterFunctionN filter;               // filter function to execute
  RTCOccludedFunctionN occluded;           // user geometry occlusion callback to execute

#if RTC_MIN_WIDTH
  float minWidthDistanceFactor;            // curve radius is set to this factor times distance to ray origin
#endif
};

/* Initializes an intersection arguments. */
RTC_FORCEINLINE void rtcInitOccludedArguments(struct RTCOccludedArguments* args)
{
  args->flags = RTC_RAY_QUERY_FLAG_INCOHERENT;
  args->feature_mask = RTC_FEATURE_FLAG_ALL;
  args->context = NULL;
  args->filter = NULL;
  args->occluded = NULL;

#if RTC_MIN_WIDTH
  args->minWidthDistanceFactor = 0.0f;
#endif
}

/* Creates a new scene. */
RTC_API RTCScene rtcNewScene(RTCDevice device);

/* Returns the device the scene got created in. The reference count of
 * the device is incremented by this function. */
RTC_API RTCDevice rtcGetSceneDevice(RTCScene hscene);
   
/* Retains the scene (increments the reference count). */
RTC_API void rtcRetainScene(RTCScene scene);

/* Releases the scene (decrements the reference count). */
RTC_API void rtcReleaseScene(RTCScene scene);


/* Attaches the geometry to a scene. */
RTC_API unsigned int rtcAttachGeometry(RTCScene scene, RTCGeometry geometry);

/* Attaches the geometry to a scene using the specified geometry ID. */
RTC_API void rtcAttachGeometryByID(RTCScene scene, RTCGeometry geometry, unsigned int geomID);

/* Detaches the geometry from the scene. */
RTC_API void rtcDetachGeometry(RTCScene scene, unsigned int geomID);

/* Gets a geometry handle from the scene. This function is not thread safe and should get used during rendering. */
RTC_API RTCGeometry rtcGetGeometry(RTCScene scene, unsigned int geomID);

/* Gets a geometry handle from the scene. This function is thread safe and should NOT get used during rendering. */
RTC_API RTCGeometry rtcGetGeometryThreadSafe(RTCScene scene, unsigned int geomID);

/* Gets the user-defined data pointer of the geometry. This function is not thread safe and should get used during rendering. */
RTC_SYCL_API void* rtcGetGeometryUserDataFromScene(RTCScene scene, unsigned int geomID);

/* Returns the interpolated transformation of an instance for the specified time. */
RTC_SYCL_API void rtcGetGeometryTransformFromScene(RTCScene scene, unsigned int geomID, float time, enum RTCFormat format, void* xfm);


/* Commits the scene. */
RTC_API void rtcCommitScene(RTCScene scene);

/* Commits the scene from multiple threads. */
RTC_API void rtcJoinCommitScene(RTCScene scene);


/* Progress monitor callback function */
typedef bool (*RTCProgressMonitorFunction)(void* ptr, double n);

/* Sets the progress monitor callback function of the scene. */
RTC_API void rtcSetSceneProgressMonitorFunction(RTCScene scene, RTCProgressMonitorFunction progress, void* ptr);

/* Sets the build quality of the scene. */
RTC_API void rtcSetSceneBuildQuality(RTCScene scene, enum RTCBuildQuality quality);

/* Sets the scene flags. */
RTC_API void rtcSetSceneFlags(RTCScene scene, enum RTCSceneFlags flags);

/* Returns the scene flags. */
RTC_API enum RTCSceneFlags rtcGetSceneFlags(RTCScene scene);

/* Returns the axis-aligned bounds of the scene. */
RTC_API void rtcGetSceneBounds(RTCScene scene, struct RTCBounds* bounds_o);

/* Returns the linear axis-aligned bounds of the scene. */
RTC_API void rtcGetSceneLinearBounds(RTCScene scene, struct RTCLinearBounds* bounds_o);


/* Perform a closest point query of the scene. */
RTC_API bool rtcPointQuery(RTCScene scene, struct RTCPointQuery* query, struct RTCPointQueryContext* context, RTCPointQueryFunction queryFunc, void* userPtr);

/* Perform a closest point query with a packet of 4 points with the scene. */
RTC_API bool rtcPointQuery4(const int* valid, RTCScene scene, struct RTCPointQuery4* query, struct RTCPointQueryContext* context, RTCPointQueryFunction queryFunc, void** userPtr);

/* Perform a closest point query with a packet of 4 points with the scene. */
RTC_API bool rtcPointQuery8(const int* valid, RTCScene scene, struct RTCPointQuery8* query, struct RTCPointQueryContext* context, RTCPointQueryFunction queryFunc, void** userPtr);

/* Perform a closest point query with a packet of 4 points with the scene. */
RTC_API bool rtcPointQuery16(const int* valid, RTCScene scene, struct RTCPointQuery16* query, struct RTCPointQueryContext* context, RTCPointQueryFunction queryFunc, void** userPtr);


/* Intersects a single ray with the scene. */
RTC_SYCL_API void rtcIntersect1(RTCScene scene, struct RTCRayHit* rayhit, struct RTCIntersectArguments* args RTC_OPTIONAL_ARGUMENT);

/* Intersects a packet of 4 rays with the scene. */
RTC_API void rtcIntersect4(const int* valid, RTCScene scene, struct RTCRayHit4* rayhit, struct RTCIntersectArguments* args RTC_OPTIONAL_ARGUMENT);

/* Intersects a packet of 8 rays with the scene. */
RTC_API void rtcIntersect8(const int* valid, RTCScene scene, struct RTCRayHit8* rayhit, struct RTCIntersectArguments* args RTC_OPTIONAL_ARGUMENT);

/* Intersects a packet of 16 rays with the scene. */
RTC_API void rtcIntersect16(const int* valid, RTCScene scene, struct RTCRayHit16* rayhit, struct RTCIntersectArguments* args RTC_OPTIONAL_ARGUMENT);


/* Forwards ray inside user geometry callback. */
RTC_SYCL_API void rtcForwardIntersect1(const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay* ray, unsigned int instID);

/* Forwards ray inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_SYCL_API void rtcForwardIntersect1Ex(const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay* ray, unsigned int instID, unsigned int instPrimID);

/* Forwards ray packet of size 4 inside user geometry callback. */
RTC_API void rtcForwardIntersect4(const int* valid, const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay4* ray, unsigned int instID);

/* Forwards ray packet of size 4 inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_API void rtcForwardIntersect4Ex(const int* valid, const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay4* ray, unsigned int instID, unsigned int primInstID);

/* Forwards ray packet of size 8 inside user geometry callback. */
RTC_API void rtcForwardIntersect8(const int* valid, const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay8* ray, unsigned int instID);

/* Forwards ray packet of size 4 inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_API void rtcForwardIntersect8Ex(const int* valid, const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay8* ray, unsigned int instID, unsigned int primInstID);

/* Forwards ray packet of size 16 inside user geometry callback. */
RTC_API void rtcForwardIntersect16(const int* valid, const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay16* ray, unsigned int instID);

/* Forwards ray packet of size 4 inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_API void rtcForwardIntersect16Ex(const int* valid, const struct RTCIntersectFunctionNArguments* args, RTCScene scene, struct RTCRay16* ray, unsigned int instID, unsigned int primInstID);


/* Tests a single ray for occlusion with the scene. */
RTC_SYCL_API void rtcOccluded1(RTCScene scene, struct RTCRay* ray, struct RTCOccludedArguments* args RTC_OPTIONAL_ARGUMENT);

/* Tests a packet of 4 rays for occlusion occluded with the scene. */
RTC_API void rtcOccluded4(const int* valid, RTCScene scene, struct RTCRay4* ray, struct RTCOccludedArguments* args RTC_OPTIONAL_ARGUMENT);

/* Tests a packet of 8 rays for occlusion with the scene. */
RTC_API void rtcOccluded8(const int* valid, RTCScene scene, struct RTCRay8* ray, struct RTCOccludedArguments* args RTC_OPTIONAL_ARGUMENT);

/* Tests a packet of 16 rays for occlusion with the scene. */
RTC_API void rtcOccluded16(const int* valid, RTCScene scene, struct RTCRay16* ray, struct RTCOccludedArguments* args RTC_OPTIONAL_ARGUMENT);


/* Forwards single occlusion ray inside user geometry callback. */
RTC_SYCL_API void rtcForwardOccluded1(const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay* ray, unsigned int instID);

/* Forwards single occlusion ray inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_SYCL_API void rtcForwardOccluded1Ex(const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay* ray, unsigned int instID, unsigned int instPrimID);

/* Forwards occlusion ray packet of size 4 inside user geometry callback. */
RTC_API void rtcForwardOccluded4(const int* valid, const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay4* ray, unsigned int instID);

/* Forwards occlusion ray packet of size 4 inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_API void rtcForwardOccluded4Ex(const int* valid, const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay4* ray, unsigned int instID, unsigned int instPrimID);

/* Forwards occlusion ray packet of size 8 inside user geometry callback. */
RTC_API void rtcForwardOccluded8(const int* valid, const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay8* ray, unsigned int instID);

/* Forwards occlusion ray packet of size 8 inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_API void rtcForwardOccluded8Ex(const int* valid, const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay8* ray, unsigned int instID, unsigned int instPrimID);

/* Forwards occlusion ray packet of size 16 inside user geometry callback. */
RTC_API void rtcForwardOccluded16(const int* valid, const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay16* ray, unsigned int instID);

/* Forwards occlusion ray packet of size 16 inside user geometry callback. Extended to handle instance arrays using instPrimID parameter. */
RTC_API void rtcForwardOccluded16Ex(const int* valid, const struct RTCOccludedFunctionNArguments* args, RTCScene scene, struct RTCRay16* ray, unsigned int instID, unsigned int instPrimID);


/*! collision callback */
struct RTCCollision { unsigned int geomID0; unsigned int primID0; unsigned int geomID1; unsigned int primID1; };
typedef void (*RTCCollideFunc) (void* userPtr, struct RTCCollision* collisions, unsigned int num_collisions);

/*! Performs collision detection of two scenes */
RTC_API void rtcCollide (RTCScene scene0, RTCScene scene1, RTCCollideFunc callback, void* userPtr);
 
#if defined(__cplusplus)

/* Helper for easily combining scene flags */
inline RTCSceneFlags operator|(RTCSceneFlags a, RTCSceneFlags b) {
  return (RTCSceneFlags)((size_t)a | (size_t)b);
}

#endif

RTC_NAMESPACE_END