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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>
#include "kernel/kernel_compat_cpu.h"
#include "kernel/split/kernel_split_data_types.h"
#include "kernel/kernel_globals.h"
#include "util/util_vector.h"
CCL_NAMESPACE_BEGIN
struct CCLIntersectContext {
typedef enum {
RAY_REGULAR = 0,
RAY_SHADOW_ALL = 1,
RAY_SSS = 2,
RAY_VOLUME_ALL = 3,
} RayType;
KernelGlobals *kg;
RayType type;
/* for shadow rays */
Intersection *isect_s;
int max_hits;
int num_hits;
/* for SSS Rays: */
LocalIntersection *ss_isect;
int sss_object_id;
uint *lcg_state;
CCLIntersectContext(KernelGlobals *kg_, RayType type_)
{
kg = kg_;
type = type_;
max_hits = 1;
num_hits = 0;
isect_s = NULL;
ss_isect = NULL;
sss_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)) + kernel_tex_fetch(__object_node, hit->instID[0]/2);
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_local_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)) + kernel_tex_fetch(__object_node, local_object_id);
isect->object = local_object_id;
isect->type = kernel_tex_fetch(__prim_type, isect->prim);
}
ccl_device_inline bool embree_scene_intersect(KernelGlobals *kg,
const Ray *ray,
const uint visibility,
Intersection *isect)
{
kernel_assert(kernel_data.bvh.scene != NULL);
isect->t = ray->t;
CCLIntersectContext ctx(kg, CCLIntersectContext::RAY_REGULAR);
IntersectContext rtc_ctx(&ctx);
RTCRayHit ray_hit;
kernel_embree_setup_rayhit(*ray, ray_hit, visibility);
rtcIntersect1(kernel_data.bvh.scene, &rtc_ctx.context, &ray_hit);
if(ray_hit.hit.geomID != RTC_INVALID_GEOMETRY_ID && ray_hit.hit.primID != RTC_INVALID_GEOMETRY_ID) {
kernel_embree_convert_hit(kg, &ray_hit.ray, &ray_hit.hit, isect);
return true;
}
return false;
}
#ifdef __BVH_LOCAL__
ccl_device_inline bool embree_scene_intersect_local(
KernelGlobals *kg,
const Ray ray,
LocalIntersection *local_isect,
int local_object,
uint *lcg_state,
int max_hits)
{
kernel_assert(kernel_data.bvh.scene != NULL);
CCLIntersectContext ctx(kg, CCLIntersectContext::RAY_SSS);
ctx.lcg_state = lcg_state;
ctx.max_hits = max_hits;
ctx.ss_isect = local_isect;
local_isect->num_hits = 0;
ctx.sss_object_id = local_object;
IntersectContext rtc_ctx(&ctx);
RTCRay rtc_ray;
kernel_embree_setup_ray(ray, rtc_ray, PATH_RAY_ALL_VISIBILITY);
/* Get the Embree scene for this intersection. */
RTCGeometry geom = rtcGetGeometry(kernel_data.bvh.scene, local_object * 2);
if(geom) {
float3 P = ray.P;
float3 dir = ray.D;
float3 idir = ray.D;
const int object_flag = kernel_tex_fetch(__object_flag, local_object);
if(!(object_flag & SD_OBJECT_TRANSFORM_APPLIED)) {
Transform ob_itfm;
rtc_ray.tfar = bvh_instance_motion_push(kg,
local_object,
&ray,
&P,
&dir,
&idir,
ray.t,
&ob_itfm);
/* bvh_instance_motion_push() returns the inverse transform but
* it's not needed here. */
(void) ob_itfm;
rtc_ray.org_x = P.x;
rtc_ray.org_y = P.y;
rtc_ray.org_z = P.z;
rtc_ray.dir_x = dir.x;
rtc_ray.dir_y = dir.y;
rtc_ray.dir_z = dir.z;
}
RTCScene scene = (RTCScene)rtcGetGeometryUserData(geom);
if(scene) {
rtcOccluded1(scene, &rtc_ctx.context, &rtc_ray);
}
}
return local_isect->num_hits > 0;
}
#endif /* __BVH_LOCAL__ */
#ifdef __SHADOW_RECORD_ALL__
ccl_device_inline bool embree_scene_intersect_shadow_all(
KernelGlobals *kg,
const Ray *ray,
Intersection *isect,
uint max_hits,
uint *num_hits)
{
kernel_assert(kernel_data.bvh.scene != NULL);
CCLIntersectContext ctx(kg, CCLIntersectContext::RAY_SHADOW_ALL);
ctx.isect_s = isect;
ctx.max_hits = max_hits;
ctx.num_hits = 0;
IntersectContext rtc_ctx(&ctx);
RTCRay rtc_ray;
kernel_embree_setup_ray(*ray, rtc_ray, PATH_RAY_SHADOW);
rtcOccluded1(kernel_data.bvh.scene, &rtc_ctx.context, &rtc_ray);
if(ctx.num_hits > max_hits) {
return true;
}
*num_hits = ctx.num_hits;
return rtc_ray.tfar == -INFINITY;
}
#endif /* __SHADOW_RECORD_ALL__ */
#ifdef __VOLUME_RECORD_ALL__
ccl_device_inline uint embree_scene_intersect_volume_all(
KernelGlobals *kg,
const Ray *ray,
Intersection *isect,
const uint max_hits,
const uint visibility)
{
kernel_assert(kernel_data.bvh.scene != NULL);
CCLIntersectContext ctx(kg, CCLIntersectContext::RAY_VOLUME_ALL);
ctx.isect_s = isect;
ctx.max_hits = max_hits;
ctx.num_hits = 0;
IntersectContext rtc_ctx(&ctx);
RTCRay rtc_ray;
kernel_embree_setup_ray(*ray, rtc_ray, visibility);
rtcOccluded1(kernel_data.bvh.scene, &rtc_ctx.context, &rtc_ray);
return rtc_ray.tfar == -INFINITY;
}
#endif /* __VOLUME_RECORD_ALL__ */
CCL_NAMESPACE_END
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