diff options
Diffstat (limited to 'intern/cycles/kernel/bvh/bvh_traversal.h')
| -rw-r--r-- | intern/cycles/kernel/bvh/bvh_traversal.h | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/intern/cycles/kernel/bvh/bvh_traversal.h b/intern/cycles/kernel/bvh/bvh_traversal.h new file mode 100644 index 00000000000..68a11b65ad7 --- /dev/null +++ b/intern/cycles/kernel/bvh/bvh_traversal.h @@ -0,0 +1,466 @@ +/* + * Adapted from code Copyright 2009-2010 NVIDIA Corporation, + * and code copyright 2009-2012 Intel Corporation + * + * Modifications Copyright 2011-2013, 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. + */ + +#ifdef __QBVH__ +# include "qbvh_traversal.h" +#endif + +#if BVH_FEATURE(BVH_HAIR) +# define NODE_INTERSECT bvh_node_intersect +# define NODE_INTERSECT_ROBUST bvh_node_intersect_robust +#else +# define NODE_INTERSECT bvh_aligned_node_intersect +# define NODE_INTERSECT_ROBUST bvh_aligned_node_intersect_robust +#endif + +/* This is a template BVH traversal function, where various features can be + * enabled/disabled. This way we can compile optimized versions for each case + * without new features slowing things down. + * + * BVH_INSTANCING: object instancing + * BVH_HAIR: hair curve rendering + * BVH_HAIR_MINIMUM_WIDTH: hair curve rendering with minimum width + * BVH_MOTION: motion blur rendering + * + */ + +ccl_device bool BVH_FUNCTION_FULL_NAME(BVH)(KernelGlobals *kg, + const Ray *ray, + Intersection *isect, + const uint visibility +#if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH) + , uint *lcg_state, + float difl, + float extmax +#endif + ) +{ + /* todo: + * - test if pushing distance on the stack helps (for non shadow rays) + * - separate version for shadow rays + * - likely and unlikely for if() statements + * - test restrict attribute for pointers + */ + + /* traversal stack in CUDA thread-local memory */ + int traversal_stack[BVH_STACK_SIZE]; + traversal_stack[0] = ENTRYPOINT_SENTINEL; + + /* traversal variables in registers */ + int stack_ptr = 0; + int node_addr = kernel_data.bvh.root; + + /* ray parameters in registers */ + float3 P = ray->P; + float3 dir = bvh_clamp_direction(ray->D); + float3 idir = bvh_inverse_direction(dir); + int object = OBJECT_NONE; + +#if BVH_FEATURE(BVH_MOTION) + Transform ob_itfm; +#endif + + isect->t = ray->t; + isect->u = 0.0f; + isect->v = 0.0f; + isect->prim = PRIM_NONE; + isect->object = OBJECT_NONE; + + BVH_DEBUG_INIT(); + +#if defined(__KERNEL_SSE2__) + const shuffle_swap_t shuf_identity = shuffle_swap_identity(); + const shuffle_swap_t shuf_swap = shuffle_swap_swap(); + + const ssef pn = cast(ssei(0, 0, 0x80000000, 0x80000000)); + ssef Psplat[3], idirsplat[3]; +# if BVH_FEATURE(BVH_HAIR) + ssef tnear(0.0f), tfar(isect->t); +# endif + shuffle_swap_t shufflexyz[3]; + + Psplat[0] = ssef(P.x); + Psplat[1] = ssef(P.y); + Psplat[2] = ssef(P.z); + + ssef tsplat(0.0f, 0.0f, -isect->t, -isect->t); + + gen_idirsplat_swap(pn, shuf_identity, shuf_swap, idir, idirsplat, shufflexyz); +#endif + + IsectPrecalc isect_precalc; + triangle_intersect_precalc(dir, &isect_precalc); + + /* traversal loop */ + do { + do { + /* traverse internal nodes */ + while(node_addr >= 0 && node_addr != ENTRYPOINT_SENTINEL) { + int node_addr_child1, traverse_mask; + float dist[2]; + float4 cnodes = kernel_tex_fetch(__bvh_nodes, node_addr+0); + +#if !defined(__KERNEL_SSE2__) +# if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH) + if(difl != 0.0f) { + traverse_mask = NODE_INTERSECT_ROBUST(kg, + P, +# if BVH_FEATURE(BVH_HAIR) + dir, +# endif + idir, + isect->t, + difl, + extmax, + node_addr, + visibility, + dist); + } + else +# endif + { + traverse_mask = NODE_INTERSECT(kg, + P, +# if BVH_FEATURE(BVH_HAIR) + dir, +# endif + idir, + isect->t, + node_addr, + visibility, + dist); + } +#else // __KERNEL_SSE2__ +# if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH) + if(difl != 0.0f) { + traverse_mask = NODE_INTERSECT_ROBUST(kg, + P, + dir, +# if BVH_FEATURE(BVH_HAIR) + tnear, + tfar, +# endif + tsplat, + Psplat, + idirsplat, + shufflexyz, + difl, + extmax, + node_addr, + visibility, + dist); + } + else +# endif + { + traverse_mask = NODE_INTERSECT(kg, + P, + dir, +# if BVH_FEATURE(BVH_HAIR) + tnear, + tfar, +# endif + tsplat, + Psplat, + idirsplat, + shufflexyz, + node_addr, + visibility, + dist); + } +#endif // __KERNEL_SSE2__ + + node_addr = __float_as_int(cnodes.z); + node_addr_child1 = __float_as_int(cnodes.w); + + if(traverse_mask == 3) { + /* Both children were intersected, push the farther one. */ + bool is_closest_child1 = (dist[1] < dist[0]); + if(is_closest_child1) { + int tmp = node_addr; + node_addr = node_addr_child1; + node_addr_child1 = tmp; + } + + ++stack_ptr; + kernel_assert(stack_ptr < BVH_STACK_SIZE); + traversal_stack[stack_ptr] = node_addr_child1; + } + else { + /* One child was intersected. */ + if(traverse_mask == 2) { + node_addr = node_addr_child1; + } + else if(traverse_mask == 0) { + /* Neither child was intersected. */ + node_addr = traversal_stack[stack_ptr]; + --stack_ptr; + } + } + BVH_DEBUG_NEXT_STEP(); + } + + /* if node is leaf, fetch triangle list */ + if(node_addr < 0) { + float4 leaf = kernel_tex_fetch(__bvh_leaf_nodes, (-node_addr-1)); + int prim_addr = __float_as_int(leaf.x); + +#if BVH_FEATURE(BVH_INSTANCING) + if(prim_addr >= 0) { +#endif + const int prim_addr2 = __float_as_int(leaf.y); + const uint type = __float_as_int(leaf.w); + + /* pop */ + node_addr = traversal_stack[stack_ptr]; + --stack_ptr; + + /* primitive intersection */ + switch(type & PRIMITIVE_ALL) { + case PRIMITIVE_TRIANGLE: { + for(; prim_addr < prim_addr2; prim_addr++) { + BVH_DEBUG_NEXT_STEP(); + kernel_assert(kernel_tex_fetch(__prim_type, prim_addr) == type); + if(triangle_intersect(kg, + &isect_precalc, + isect, + P, + visibility, + object, + prim_addr)) + { + /* shadow ray early termination */ +#if defined(__KERNEL_SSE2__) + if(visibility == PATH_RAY_SHADOW_OPAQUE) + return true; + tsplat = ssef(0.0f, 0.0f, -isect->t, -isect->t); +# if BVH_FEATURE(BVH_HAIR) + tfar = ssef(isect->t); +# endif +#else + if(visibility == PATH_RAY_SHADOW_OPAQUE) + return true; +#endif + } + } + break; + } +#if BVH_FEATURE(BVH_MOTION) + case PRIMITIVE_MOTION_TRIANGLE: { + for(; prim_addr < prim_addr2; prim_addr++) { + BVH_DEBUG_NEXT_STEP(); + kernel_assert(kernel_tex_fetch(__prim_type, prim_addr) == type); + if(motion_triangle_intersect(kg, + isect, + P, + dir, + ray->time, + visibility, + object, + prim_addr)) + { + /* shadow ray early termination */ +# if defined(__KERNEL_SSE2__) + if(visibility == PATH_RAY_SHADOW_OPAQUE) + return true; + tsplat = ssef(0.0f, 0.0f, -isect->t, -isect->t); +# if BVH_FEATURE(BVH_HAIR) + tfar = ssef(isect->t); +# endif +# else + if(visibility == PATH_RAY_SHADOW_OPAQUE) + return true; +# endif + } + } + break; + } +#endif /* BVH_FEATURE(BVH_MOTION) */ +#if BVH_FEATURE(BVH_HAIR) + case PRIMITIVE_CURVE: + case PRIMITIVE_MOTION_CURVE: { + for(; prim_addr < prim_addr2; prim_addr++) { + BVH_DEBUG_NEXT_STEP(); + kernel_assert(kernel_tex_fetch(__prim_type, prim_addr) == type); + bool hit; + if(kernel_data.curve.curveflags & CURVE_KN_INTERPOLATE) { + hit = bvh_cardinal_curve_intersect(kg, + isect, + P, + dir, + visibility, + object, + prim_addr, + ray->time, + type, + lcg_state, + difl, + extmax); + } + else { + hit = bvh_curve_intersect(kg, + isect, + P, + dir, + visibility, + object, + prim_addr, + ray->time, + type, + lcg_state, + difl, + extmax); + } + if(hit) { + /* shadow ray early termination */ +# if defined(__KERNEL_SSE2__) + if(visibility == PATH_RAY_SHADOW_OPAQUE) + return true; + tsplat = ssef(0.0f, 0.0f, -isect->t, -isect->t); +# if BVH_FEATURE(BVH_HAIR) + tfar = ssef(isect->t); +# endif +# else + if(visibility == PATH_RAY_SHADOW_OPAQUE) + return true; +# endif + } + } + break; + } +#endif /* BVH_FEATURE(BVH_HAIR) */ + } + } +#if BVH_FEATURE(BVH_INSTANCING) + else { + /* instance push */ + object = kernel_tex_fetch(__prim_object, -prim_addr-1); + +# if BVH_FEATURE(BVH_MOTION) + bvh_instance_motion_push(kg, object, ray, &P, &dir, &idir, &isect->t, &ob_itfm); +# else + bvh_instance_push(kg, object, ray, &P, &dir, &idir, &isect->t); +# endif + triangle_intersect_precalc(dir, &isect_precalc); + +# if defined(__KERNEL_SSE2__) + Psplat[0] = ssef(P.x); + Psplat[1] = ssef(P.y); + Psplat[2] = ssef(P.z); + + tsplat = ssef(0.0f, 0.0f, -isect->t, -isect->t); +# if BVH_FEATURE(BVH_HAIR) + tfar = ssef(isect->t); +# endif + + gen_idirsplat_swap(pn, shuf_identity, shuf_swap, idir, idirsplat, shufflexyz); +# endif + + ++stack_ptr; + kernel_assert(stack_ptr < BVH_STACK_SIZE); + traversal_stack[stack_ptr] = ENTRYPOINT_SENTINEL; + + node_addr = kernel_tex_fetch(__object_node, object); + + BVH_DEBUG_NEXT_INSTANCE(); + } + } +#endif /* FEATURE(BVH_INSTANCING) */ + } while(node_addr != ENTRYPOINT_SENTINEL); + +#if BVH_FEATURE(BVH_INSTANCING) + if(stack_ptr >= 0) { + kernel_assert(object != OBJECT_NONE); + + /* instance pop */ +# if BVH_FEATURE(BVH_MOTION) + bvh_instance_motion_pop(kg, object, ray, &P, &dir, &idir, &isect->t, &ob_itfm); +# else + bvh_instance_pop(kg, object, ray, &P, &dir, &idir, &isect->t); +# endif + triangle_intersect_precalc(dir, &isect_precalc); + +# if defined(__KERNEL_SSE2__) + Psplat[0] = ssef(P.x); + Psplat[1] = ssef(P.y); + Psplat[2] = ssef(P.z); + + tsplat = ssef(0.0f, 0.0f, -isect->t, -isect->t); +# if BVH_FEATURE(BVH_HAIR) + tfar = ssef(isect->t); +# endif + + gen_idirsplat_swap(pn, shuf_identity, shuf_swap, idir, idirsplat, shufflexyz); +# endif + + object = OBJECT_NONE; + node_addr = traversal_stack[stack_ptr]; + --stack_ptr; + } +#endif /* FEATURE(BVH_INSTANCING) */ + } while(node_addr != ENTRYPOINT_SENTINEL); + + return (isect->prim != PRIM_NONE); +} + +ccl_device_inline bool BVH_FUNCTION_NAME(KernelGlobals *kg, + const Ray *ray, + Intersection *isect, + const uint visibility +#if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH) + , uint *lcg_state, + float difl, + float extmax +#endif + ) +{ +#ifdef __QBVH__ + if(kernel_data.bvh.use_qbvh) { + return BVH_FUNCTION_FULL_NAME(QBVH)(kg, + ray, + isect, + visibility +#if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH) + , lcg_state, + difl, + extmax +#endif + ); + } + else +#endif + { + kernel_assert(kernel_data.bvh.use_qbvh == false); + return BVH_FUNCTION_FULL_NAME(BVH)(kg, + ray, + isect, + visibility +#if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH) + , lcg_state, + difl, + extmax +#endif + ); + } +} + +#undef BVH_FUNCTION_NAME +#undef BVH_FUNCTION_FEATURES +#undef NODE_INTERSECT +#undef NODE_INTERSECT_ROBUST |