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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2018-2022 Blender Foundation. */
#pragma once
#include <embree3/rtcore_ray.h>
#include <embree3/rtcore_scene.h>
#include "kernel/device/cpu/compat.h"
#include "kernel/device/cpu/globals.h"
#include "kernel/bvh/util.h"
#include "util/vector.h"
CCL_NAMESPACE_BEGIN
struct CCLIntersectContext {
typedef enum {
RAY_REGULAR = 0,
RAY_SHADOW_ALL = 1,
RAY_LOCAL = 2,
RAY_SSS = 3,
RAY_VOLUME_ALL = 4,
} RayType;
KernelGlobals kg;
RayType type;
/* For avoiding self intersections */
const Ray *ray;
/* for shadow rays */
Intersection *isect_s;
uint max_hits;
uint num_hits;
uint num_recorded_hits;
float throughput;
float max_t;
bool opaque_hit;
/* for SSS Rays: */
LocalIntersection *local_isect;
int local_object_id;
uint *lcg_state;
CCLIntersectContext(KernelGlobals kg_, RayType type_)
{
kg = kg_;
type = type_;
ray = NULL;
max_hits = 1;
num_hits = 0;
num_recorded_hits = 0;
throughput = 1.0f;
max_t = FLT_MAX;
opaque_hit = false;
isect_s = NULL;
local_isect = NULL;
local_object_id = -1;
lcg_state = NULL;
}
};
class IntersectContext {
public:
IntersectContext(CCLIntersectContext *ctx)
{
rtcInitIntersectContext(&context);
userRayExt = ctx;
}
RTCIntersectContext context;
CCLIntersectContext *userRayExt;
};
ccl_device_inline void kernel_embree_setup_ray(const Ray &ray,
RTCRay &rtc_ray,
const uint visibility)
{
rtc_ray.org_x = ray.P.x;
rtc_ray.org_y = ray.P.y;
rtc_ray.org_z = ray.P.z;
rtc_ray.dir_x = ray.D.x;
rtc_ray.dir_y = ray.D.y;
rtc_ray.dir_z = ray.D.z;
rtc_ray.tnear = 0.0f;
rtc_ray.tfar = ray.t;
rtc_ray.time = ray.time;
rtc_ray.mask = visibility;
}
ccl_device_inline void kernel_embree_setup_rayhit(const Ray &ray,
RTCRayHit &rayhit,
const uint visibility)
{
kernel_embree_setup_ray(ray, rayhit.ray, visibility);
rayhit.hit.geomID = RTC_INVALID_GEOMETRY_ID;
rayhit.hit.instID[0] = RTC_INVALID_GEOMETRY_ID;
}
ccl_device_inline bool kernel_embree_is_self_intersection(const KernelGlobals kg,
const RTCHit *hit,
const Ray *ray)
{
bool status = false;
if (hit->instID[0] != RTC_INVALID_GEOMETRY_ID) {
const int oID = hit->instID[0] / 2;
if ((ray->self.object == oID) || (ray->self.light_object == oID)) {
RTCScene inst_scene = (RTCScene)rtcGetGeometryUserData(
rtcGetGeometry(kernel_data.bvh.scene, hit->instID[0]));
const int pID = hit->primID +
(intptr_t)rtcGetGeometryUserData(rtcGetGeometry(inst_scene, hit->geomID));
status = intersection_skip_self_shadow(ray->self, oID, pID);
}
}
else {
const int oID = hit->geomID / 2;
if ((ray->self.object == oID) || (ray->self.light_object == oID)) {
const int pID = hit->primID + (intptr_t)rtcGetGeometryUserData(
rtcGetGeometry(kernel_data.bvh.scene, hit->geomID));
status = intersection_skip_self_shadow(ray->self, oID, pID);
}
}
return status;
}
ccl_device_inline void kernel_embree_convert_hit(KernelGlobals kg,
const RTCRay *ray,
const RTCHit *hit,
Intersection *isect)
{
isect->t = ray->tfar;
if (hit->instID[0] != RTC_INVALID_GEOMETRY_ID) {
RTCScene inst_scene = (RTCScene)rtcGetGeometryUserData(
rtcGetGeometry(kernel_data.bvh.scene, hit->instID[0]));
isect->prim = hit->primID +
(intptr_t)rtcGetGeometryUserData(rtcGetGeometry(inst_scene, hit->geomID));
isect->object = hit->instID[0] / 2;
}
else {
isect->prim = hit->primID + (intptr_t)rtcGetGeometryUserData(
rtcGetGeometry(kernel_data.bvh.scene, hit->geomID));
isect->object = hit->geomID / 2;
}
const bool is_hair = hit->geomID & 1;
if (is_hair) {
const KernelCurveSegment segment = kernel_data_fetch(curve_segments, isect->prim);
isect->type = segment.type;
isect->prim = segment.prim;
isect->u = hit->u;
isect->v = hit->v;
}
else {
isect->type = kernel_data_fetch(objects, isect->object).primitive_type;
isect->u = 1.0f - hit->v - hit->u;
isect->v = hit->u;
}
}
ccl_device_inline void kernel_embree_convert_sss_hit(
KernelGlobals kg, const RTCRay *ray, const RTCHit *hit, Intersection *isect, int object)
{
isect->u = 1.0f - hit->v - hit->u;
isect->v = hit->u;
isect->t = ray->tfar;
RTCScene inst_scene = (RTCScene)rtcGetGeometryUserData(
rtcGetGeometry(kernel_data.bvh.scene, object * 2));
isect->prim = hit->primID +
(intptr_t)rtcGetGeometryUserData(rtcGetGeometry(inst_scene, hit->geomID));
isect->object = object;
isect->type = kernel_data_fetch(objects, object).primitive_type;
}
CCL_NAMESPACE_END
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