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blender/intern/cycles/kernel/geom/geom_bvh.h

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/*
* Adapted from code Copyright 2009-2010 NVIDIA Corporation
* Modifications Copyright 2011, 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.
*/
/*
* "Persistent while-while kernel" used in:
*
* "Understanding the Efficiency of Ray Traversal on GPUs",
* Timo Aila and Samuli Laine,
* Proc. High-Performance Graphics 2009
*/
/* bottom-most stack entry, indicating the end of traversal */
#define ENTRYPOINT_SENTINEL 0x76543210
/* 64 object BVH + 64 mesh BVH + 64 object node splitting */
#define BVH_STACK_SIZE 192
#define BVH_NODE_SIZE 4
#define TRI_NODE_SIZE 3
/* silly workaround for float extended precision that happens when compiling
* without sse support on x86, it results in different results for float ops
* that you would otherwise expect to compare correctly */
#if !defined(__i386__) || defined(__SSE__)
#define NO_EXTENDED_PRECISION
#else
#define NO_EXTENDED_PRECISION volatile
#endif
#include "geom_object.h"
#include "geom_triangle.h"
#include "geom_motion_triangle.h"
#include "geom_motion_curve.h"
#include "geom_curve.h"
CCL_NAMESPACE_BEGIN
/* BVH intersection function variations */
#define BVH_INSTANCING 1
#define BVH_MOTION 2
#define BVH_HAIR 4
#define BVH_HAIR_MINIMUM_WIDTH 8
#define BVH_FUNCTION_NAME bvh_intersect
#define BVH_FUNCTION_FEATURES 0
#include "geom_bvh_traversal.h"
#if defined(__INSTANCING__)
#define BVH_FUNCTION_NAME bvh_intersect_instancing
#define BVH_FUNCTION_FEATURES BVH_INSTANCING
#include "geom_bvh_traversal.h"
#endif
#if defined(__HAIR__)
#define BVH_FUNCTION_NAME bvh_intersect_hair
#define BVH_FUNCTION_FEATURES BVH_INSTANCING|BVH_HAIR|BVH_HAIR_MINIMUM_WIDTH
#include "geom_bvh_traversal.h"
#endif
#if defined(__OBJECT_MOTION__)
#define BVH_FUNCTION_NAME bvh_intersect_motion
#define BVH_FUNCTION_FEATURES BVH_INSTANCING|BVH_MOTION
#include "geom_bvh_traversal.h"
#endif
#if defined(__HAIR__) && defined(__OBJECT_MOTION__)
#define BVH_FUNCTION_NAME bvh_intersect_hair_motion
#define BVH_FUNCTION_FEATURES BVH_INSTANCING|BVH_HAIR|BVH_HAIR_MINIMUM_WIDTH|BVH_MOTION
#include "geom_bvh_traversal.h"
#endif
#if defined(__SUBSURFACE__)
#define BVH_FUNCTION_NAME bvh_intersect_subsurface
#define BVH_FUNCTION_FEATURES 0
#include "geom_bvh_subsurface.h"
#endif
#if defined(__SUBSURFACE__) && defined(__INSTANCING__)
#define BVH_FUNCTION_NAME bvh_intersect_subsurface_instancing
#define BVH_FUNCTION_FEATURES BVH_INSTANCING
#include "geom_bvh_subsurface.h"
#endif
#if defined(__SUBSURFACE__) && defined(__HAIR__)
#define BVH_FUNCTION_NAME bvh_intersect_subsurface_hair
#define BVH_FUNCTION_FEATURES BVH_INSTANCING|BVH_HAIR
#include "geom_bvh_subsurface.h"
#endif
#if defined(__SUBSURFACE__) && defined(__OBJECT_MOTION__)
#define BVH_FUNCTION_NAME bvh_intersect_subsurface_motion
#define BVH_FUNCTION_FEATURES BVH_INSTANCING|BVH_MOTION
#include "geom_bvh_subsurface.h"
#endif
#if defined(__SUBSURFACE__) && defined(__HAIR__) && defined(__OBJECT_MOTION__)
#define BVH_FUNCTION_NAME bvh_intersect_subsurface_hair_motion
#define BVH_FUNCTION_FEATURES BVH_INSTANCING|BVH_HAIR|BVH_MOTION
#include "geom_bvh_subsurface.h"
#endif
/* to work around titan bug when using arrays instead of textures */
#if !defined(__KERNEL_CUDA__) || defined(__KERNEL_CUDA_TEX_STORAGE__)
ccl_device_inline
#else
ccl_device_noinline
#endif
#ifdef __HAIR__
bool scene_intersect(KernelGlobals *kg, const Ray *ray, const uint visibility, Intersection *isect, uint *lcg_state, float difl, float extmax)
#else
bool scene_intersect(KernelGlobals *kg, const Ray *ray, const uint visibility, Intersection *isect)
#endif
{
#ifdef __OBJECT_MOTION__
if(kernel_data.bvh.have_motion) {
#ifdef __HAIR__
if(kernel_data.bvh.have_curves)
return bvh_intersect_hair_motion(kg, ray, isect, visibility, lcg_state, difl, extmax);
#endif /* __HAIR__ */
return bvh_intersect_motion(kg, ray, isect, visibility);
}
#endif /* __OBJECT_MOTION__ */
#ifdef __HAIR__
if(kernel_data.bvh.have_curves)
return bvh_intersect_hair(kg, ray, isect, visibility, lcg_state, difl, extmax);
#endif /* __HAIR__ */
#ifdef __KERNEL_CPU__
#ifdef __INSTANCING__
if(kernel_data.bvh.have_instancing)
return bvh_intersect_instancing(kg, ray, isect, visibility);
#endif /* __INSTANCING__ */
return bvh_intersect(kg, ray, isect, visibility);
#else /* __KERNEL_CPU__ */
#ifdef __INSTANCING__
return bvh_intersect_instancing(kg, ray, isect, visibility);
#else
return bvh_intersect(kg, ray, isect, visibility);
#endif /* __INSTANCING__ */
#endif /* __KERNEL_CPU__ */
}
/* to work around titan bug when using arrays instead of textures */
#ifdef __SUBSURFACE__
#if !defined(__KERNEL_CUDA__) || defined(__KERNEL_CUDA_TEX_STORAGE__)
ccl_device_inline
#else
ccl_device_noinline
#endif
uint scene_intersect_subsurface(KernelGlobals *kg, const Ray *ray, Intersection *isect, int subsurface_object, uint *lcg_state, int max_hits)
{
#ifdef __OBJECT_MOTION__
if(kernel_data.bvh.have_motion) {
#ifdef __HAIR__
if(kernel_data.bvh.have_curves)
return bvh_intersect_subsurface_hair_motion(kg, ray, isect, subsurface_object, lcg_state, max_hits);
#endif /* __HAIR__ */
return bvh_intersect_subsurface_motion(kg, ray, isect, subsurface_object, lcg_state, max_hits);
}
#endif /* __OBJECT_MOTION__ */
#ifdef __HAIR__
if(kernel_data.bvh.have_curves)
return bvh_intersect_subsurface_hair(kg, ray, isect, subsurface_object, lcg_state, max_hits);
#endif /* __HAIR__ */
#ifdef __KERNEL_CPU__
#ifdef __INSTANCING__
if(kernel_data.bvh.have_instancing)
return bvh_intersect_subsurface_instancing(kg, ray, isect, subsurface_object, lcg_state, max_hits);
#endif /* __INSTANCING__ */
return bvh_intersect_subsurface(kg, ray, isect, subsurface_object, lcg_state, max_hits);
#else /* __KERNEL_CPU__ */
#ifdef __INSTANCING__
return bvh_intersect_subsurface_instancing(kg, ray, isect, subsurface_object, lcg_state, max_hits);
#else
return bvh_intersect_subsurface(kg, ray, isect, subsurface_object, lcg_state, max_hits);
#endif /* __INSTANCING__ */
#endif /* __KERNEL_CPU__ */
}
#endif
/* Ray offset to avoid self intersection */
ccl_device_inline float3 ray_offset(float3 P, float3 Ng)
{
#ifdef __INTERSECTION_REFINE__
const float epsilon_f = 1e-5f;
/* ideally this should match epsilon_f, but instancing and motion blur
* precision makes it problematic */
const float epsilon_test = 1.0f;
const int epsilon_i = 32;
float3 res;
/* x component */
if(fabsf(P.x) < epsilon_test) {
res.x = P.x + Ng.x*epsilon_f;
}
else {
uint ix = __float_as_uint(P.x);
ix += ((ix ^ __float_as_uint(Ng.x)) >> 31)? -epsilon_i: epsilon_i;
res.x = __uint_as_float(ix);
}
/* y component */
if(fabsf(P.y) < epsilon_test) {
res.y = P.y + Ng.y*epsilon_f;
}
else {
uint iy = __float_as_uint(P.y);
iy += ((iy ^ __float_as_uint(Ng.y)) >> 31)? -epsilon_i: epsilon_i;
res.y = __uint_as_float(iy);
}
/* z component */
if(fabsf(P.z) < epsilon_test) {
res.z = P.z + Ng.z*epsilon_f;
}
else {
uint iz = __float_as_uint(P.z);
iz += ((iz ^ __float_as_uint(Ng.z)) >> 31)? -epsilon_i: epsilon_i;
res.z = __uint_as_float(iz);
}
return res;
#else
const float epsilon_f = 1e-4f;
return P + epsilon_f*Ng;
#endif
}
CCL_NAMESPACE_END
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