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/*
* Copyright 2018, Blender Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <embree3/rtcore_ray.h>
#include <embree3/rtcore_scene.h>
// clang-format off
#include "kernel/kernel_compat_cpu.h"
#include "kernel/split/kernel_split_data_types.h"
#include "kernel/kernel_globals.h"
// clang-format on
#include "util/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 shadow rays */
Intersection *isect_s;
int max_hits;
int num_hits;
/* for SSS Rays: */
LocalIntersection *local_isect;
int local_object_id;
uint *lcg_state;
CCLIntersectContext(KernelGlobals *kg_, RayType type_)
{
kg = kg_;
type = type_;
max_hits = 1;
num_hits = 0;
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.primID = RTC_INVALID_GEOMETRY_ID;
}
ccl_device_inline void kernel_embree_convert_hit(KernelGlobals *kg,
const RTCRay *ray,
const RTCHit *hit,
Intersection *isect)
{
bool is_hair = hit->geomID & 1;
isect->u = is_hair ? hit->u : 1.0f - hit->v - hit->u;
isect->v = is_hair ? hit->v : hit->u;
isect->t = ray->tfar;
isect->Ng = make_float3(hit->Ng_x, hit->Ng_y, hit->Ng_z);
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 = OBJECT_NONE;
}
isect->type = kernel_tex_fetch(__prim_type, isect->prim);
}
ccl_device_inline void kernel_embree_convert_sss_hit(KernelGlobals *kg,
const RTCRay *ray,
const RTCHit *hit,
Intersection *isect,
int local_object_id)
{
isect->u = 1.0f - hit->v - hit->u;
isect->v = hit->u;
isect->t = ray->tfar;
isect->Ng = make_float3(hit->Ng_x, hit->Ng_y, hit->Ng_z);
RTCScene inst_scene = (RTCScene)rtcGetGeometryUserData(
rtcGetGeometry(kernel_data.bvh.scene, local_object_id * 2));
isect->prim = hit->primID +
(intptr_t)rtcGetGeometryUserData(rtcGetGeometry(inst_scene, hit->geomID));
isect->object = local_object_id;
isect->type = kernel_tex_fetch(__prim_type, isect->prim);
}
CCL_NAMESPACE_END
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