diff options
Diffstat (limited to 'intern/cycles/kernel/bvh/obvh_shadow_all.h')
| -rw-r--r-- | intern/cycles/kernel/bvh/obvh_shadow_all.h | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/intern/cycles/kernel/bvh/obvh_shadow_all.h b/intern/cycles/kernel/bvh/obvh_shadow_all.h new file mode 100644 index 00000000000..3e877065127 --- /dev/null +++ b/intern/cycles/kernel/bvh/obvh_shadow_all.h @@ -0,0 +1,687 @@ +/* + * 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. + */ + +/* 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_MOTION: motion blur rendering + * + */ + +#if BVH_FEATURE(BVH_HAIR) +# define NODE_INTERSECT obvh_node_intersect +#else +# define NODE_INTERSECT obvh_aligned_node_intersect +#endif + +ccl_device bool BVH_FUNCTION_FULL_NAME(OBVH)(KernelGlobals *kg, + const Ray *ray, + Intersection *isect_array, + const int skip_object, + const uint max_hits, + uint *num_hits) +{ + /* TODO(sergey): + * - Test if pushing distance on the stack helps. + * - Likely and unlikely for if() statements. + * - Test restrict attribute for pointers. + */ + + /* Traversal stack in CUDA thread-local memory. */ + OBVHStackItem traversal_stack[BVH_OSTACK_SIZE]; + traversal_stack[0].addr = ENTRYPOINT_SENTINEL; + + /* Traversal variables in registers. */ + int stack_ptr = 0; + int node_addr = kernel_data.bvh.root; + + /* Ray parameters in registers. */ + const float tmax = ray->t; + float3 P = ray->P; + float3 dir = bvh_clamp_direction(ray->D); + float3 idir = bvh_inverse_direction(dir); + int object = OBJECT_NONE; + float isect_t = tmax; + +#if BVH_FEATURE(BVH_MOTION) + Transform ob_itfm; +#endif + + *num_hits = 0; + isect_array->t = tmax; + +#ifndef __KERNEL_SSE41__ + if(!isfinite(P.x)) { + return false; + } +#endif + +#if BVH_FEATURE(BVH_INSTANCING) + int num_hits_in_instance = 0; +#endif + + avxf tnear(0.0f), tfar(isect_t); +#if BVH_FEATURE(BVH_HAIR) + avx3f dir4(avxf(dir.x), avxf(dir.y), avxf(dir.z)); +#endif + avx3f idir4(avxf(idir.x), avxf(idir.y), avxf(idir.z)); + +#ifdef __KERNEL_AVX2__ + float3 P_idir = P*idir; + avx3f P_idir4(P_idir.x, P_idir.y, P_idir.z); +#endif +#if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__) + avx3f org4(avxf(P.x), avxf(P.y), avxf(P.z)); +#endif + + /* Offsets to select the side that becomes the lower or upper bound. */ + int near_x, near_y, near_z; + int far_x, far_y, far_z; + obvh_near_far_idx_calc(idir, + &near_x, &near_y, &near_z, + &far_x, &far_y, &far_z); + + /* Traversal loop. */ + do { + do { + /* Traverse internal nodes. */ + while(node_addr >= 0 && node_addr != ENTRYPOINT_SENTINEL) { + float4 inodes = kernel_tex_fetch(__bvh_nodes, node_addr+0); + (void)inodes; + + if(false +#ifdef __VISIBILITY_FLAG__ + || ((__float_as_uint(inodes.x) & PATH_RAY_SHADOW) == 0) +#endif +#if BVH_FEATURE(BVH_MOTION) + || UNLIKELY(ray->time < inodes.y) + || UNLIKELY(ray->time > inodes.z) +#endif + ) { + /* Pop. */ + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } + + avxf dist; + int child_mask = NODE_INTERSECT(kg, + tnear, + tfar, +#ifdef __KERNEL_AVX2__ + P_idir4, +#endif +#if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__) +//#if !defined(__KERNEL_AVX2__) + org4, +#endif +#if BVH_FEATURE(BVH_HAIR) + dir4, +#endif + idir4, + near_x, near_y, near_z, + far_x, far_y, far_z, + node_addr, + &dist); + + if(child_mask != 0) { + avxf cnodes; +#if BVH_FEATURE(BVH_HAIR) + if(__float_as_uint(inodes.x) & PATH_RAY_NODE_UNALIGNED) { + cnodes = kernel_tex_fetch_avxf(__bvh_nodes, node_addr+26); + } + else +#endif + { + cnodes = kernel_tex_fetch_avxf(__bvh_nodes, node_addr+14); + } + + /* One child is hit, continue with that child. */ + int r = __bscf(child_mask); + if(child_mask == 0) { + node_addr = __float_as_int(cnodes[r]); + continue; + } + + /* Two children are hit, push far child, and continue with + * closer child. + */ + int c0 = __float_as_int(cnodes[r]); + float d0 = ((float*)&dist)[r]; + r = __bscf(child_mask); + int c1 = __float_as_int(cnodes[r]); + float d1 = ((float*)&dist)[r]; + if(child_mask == 0) { + if(d1 < d0) { + node_addr = c1; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c0; + traversal_stack[stack_ptr].dist = d0; + continue; + } + else { + node_addr = c0; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c1; + traversal_stack[stack_ptr].dist = d1; + continue; + } + } + + /* Here starts the slow path for 3 or 4 hit children. We push + * all nodes onto the stack to sort them there. + */ + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c1; + traversal_stack[stack_ptr].dist = d1; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c0; + traversal_stack[stack_ptr].dist = d0; + + /* Three children are hit, push all onto stack and sort 3 + * stack items, continue with closest child. + */ + r = __bscf(child_mask); + int c2 = __float_as_int(cnodes[r]); + float d2 = ((float*)&dist)[r]; + if(child_mask == 0) { + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c2; + traversal_stack[stack_ptr].dist = d2; + obvh_stack_sort(&traversal_stack[stack_ptr], + &traversal_stack[stack_ptr - 1], + &traversal_stack[stack_ptr - 2]); + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } + + /* Four children are hit, push all onto stack and sort 4 + * stack items, continue with closest child. + */ + r = __bscf(child_mask); + int c3 = __float_as_int(cnodes[r]); + float d3 = ((float*)&dist)[r]; + if(child_mask == 0) { + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c3; + traversal_stack[stack_ptr].dist = d3; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c2; + traversal_stack[stack_ptr].dist = d2; + obvh_stack_sort(&traversal_stack[stack_ptr], + &traversal_stack[stack_ptr - 1], + &traversal_stack[stack_ptr - 2], + &traversal_stack[stack_ptr - 3]); + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } + + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c3; + traversal_stack[stack_ptr].dist = d3; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c2; + traversal_stack[stack_ptr].dist = d2; + + /* Five children are hit, push all onto stack and sort 5 + * stack items, continue with closest child + */ + r = __bscf(child_mask); + int c4 = __float_as_int(cnodes[r]); + float d4 = ((float*)&dist)[r]; + if(child_mask == 0) { + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c4; + traversal_stack[stack_ptr].dist = d4; + obvh_stack_sort(&traversal_stack[stack_ptr], + &traversal_stack[stack_ptr - 1], + &traversal_stack[stack_ptr - 2], + &traversal_stack[stack_ptr - 3], + &traversal_stack[stack_ptr - 4]); + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } + + /* Six children are hit, push all onto stack and sort 6 + * stack items, continue with closest child. + */ + r = __bscf(child_mask); + int c5 = __float_as_int(cnodes[r]); + float d5 = ((float*)&dist)[r]; + if(child_mask == 0) { + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c5; + traversal_stack[stack_ptr].dist = d5; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c4; + traversal_stack[stack_ptr].dist = d4; + obvh_stack_sort(&traversal_stack[stack_ptr], + &traversal_stack[stack_ptr - 1], + &traversal_stack[stack_ptr - 2], + &traversal_stack[stack_ptr - 3], + &traversal_stack[stack_ptr - 4], + &traversal_stack[stack_ptr - 5]); + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } + + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c5; + traversal_stack[stack_ptr].dist = d5; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c4; + traversal_stack[stack_ptr].dist = d4; + + /* Seven children are hit, push all onto stack and sort 7 + * stack items, continue with closest child. + */ + r = __bscf(child_mask); + int c6 = __float_as_int(cnodes[r]); + float d6 = ((float*)&dist)[r]; + if(child_mask == 0) { + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c6; + traversal_stack[stack_ptr].dist = d6; + obvh_stack_sort(&traversal_stack[stack_ptr], + &traversal_stack[stack_ptr - 1], + &traversal_stack[stack_ptr - 2], + &traversal_stack[stack_ptr - 3], + &traversal_stack[stack_ptr - 4], + &traversal_stack[stack_ptr - 5], + &traversal_stack[stack_ptr - 6]); + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } + + /* Eight children are hit, push all onto stack and sort 8 + * stack items, continue with closest child. + */ + r = __bscf(child_mask); + int c7 = __float_as_int(cnodes[r]); + float d7 = ((float*)&dist)[r]; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c7; + traversal_stack[stack_ptr].dist = d7; + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = c6; + traversal_stack[stack_ptr].dist = d6; + obvh_stack_sort(&traversal_stack[stack_ptr], + &traversal_stack[stack_ptr - 1], + &traversal_stack[stack_ptr - 2], + &traversal_stack[stack_ptr - 3], + &traversal_stack[stack_ptr - 4], + &traversal_stack[stack_ptr - 5], + &traversal_stack[stack_ptr - 6], + &traversal_stack[stack_ptr - 7]); + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } + + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + } + + /* If node is leaf, fetch triangle list. */ + if(node_addr < 0) { + float4 leaf = kernel_tex_fetch(__bvh_leaf_nodes, (-node_addr-1)); +#ifdef __VISIBILITY_FLAG__ + if((__float_as_uint(leaf.z) & PATH_RAY_SHADOW) == 0) { + /* Pop. */ + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + continue; + } +#endif + + int prim_addr = __float_as_int(leaf.x); + +#if BVH_FEATURE(BVH_INSTANCING) + if(prim_addr >= 0) { +#endif + int prim_addr2 = __float_as_int(leaf.y); + const uint type = __float_as_int(leaf.w); + const uint p_type = type & PRIMITIVE_ALL; + + /* Pop. */ + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + + /* Primitive intersection. */ + if(p_type == PRIMITIVE_TRIANGLE) { + int prim_count = prim_addr2 - prim_addr; + if(prim_count < 3) { + while(prim_addr < prim_addr2) { + kernel_assert((kernel_tex_fetch(__prim_type, prim_addr) & PRIMITIVE_ALL) == p_type); + int hit = triangle_intersect(kg, + isect_array, + P, + dir, + PATH_RAY_SHADOW, + object, + prim_addr); + /* Shadow ray early termination. */ + if(hit) { + /* detect if this surface has a shader with transparent shadows */ + + /* todo: optimize so primitive visibility flag indicates if + * the primitive has a transparent shadow shader? */ + int prim = kernel_tex_fetch(__prim_index, isect_array->prim); + int shader = 0; + +#ifdef __HAIR__ + if(kernel_tex_fetch(__prim_type, isect_array->prim) & PRIMITIVE_ALL_TRIANGLE) +#endif + { + shader = kernel_tex_fetch(__tri_shader, prim); + } +#ifdef __HAIR__ + else { + float4 str = kernel_tex_fetch(__curves, prim); + shader = __float_as_int(str.z); + } +#endif + int flag = kernel_tex_fetch(__shaders, (shader & SHADER_MASK)).flags; + + /* if no transparent shadows, all light is blocked */ + if(!(flag & SD_HAS_TRANSPARENT_SHADOW)) { + return true; + } + /* if maximum number of hits reached, block all light */ + else if(*num_hits == max_hits) { + return true; + } + + /* move on to next entry in intersections array */ + isect_array++; + (*num_hits)++; +#if BVH_FEATURE(BVH_INSTANCING) + num_hits_in_instance++; +#endif + + isect_array->t = isect_t; + } + + prim_addr++; + } //while + } else { + kernel_assert((kernel_tex_fetch(__prim_type, (prim_addr)) & PRIMITIVE_ALL) == p_type); + +#if BVH_FEATURE(BVH_INSTANCING) + int* nhiptr = &num_hits_in_instance; +#else + int nhi= 0; + int *nhiptr = &nhi; +#endif + + int result = triangle_intersect8(kg, + &isect_array, + P, + dir, + PATH_RAY_SHADOW, + object, + prim_addr, + prim_count, + num_hits, + max_hits, + nhiptr, + isect_t); + if(result == 2) { + return true; + } + } // prim_count + } // PRIMITIVE_TRIANGLE + else { + while(prim_addr < prim_addr2) { + kernel_assert((kernel_tex_fetch(__prim_type, prim_addr) & PRIMITIVE_ALL) == p_type); + +#ifdef __SHADOW_TRICKS__ + uint tri_object = (object == OBJECT_NONE) + ? kernel_tex_fetch(__prim_object, prim_addr) + : object; + if(tri_object == skip_object) { + ++prim_addr; + continue; + } +#endif + + bool hit; + + /* todo: specialized intersect functions which don't fill in + * isect unless needed and check SD_HAS_TRANSPARENT_SHADOW? + * might give a few % performance improvement */ + + switch(p_type) { + +#if BVH_FEATURE(BVH_MOTION) + case PRIMITIVE_MOTION_TRIANGLE: { + hit = motion_triangle_intersect(kg, + isect_array, + P, + dir, + ray->time, + PATH_RAY_SHADOW, + object, + prim_addr); + break; + } +#endif +#if BVH_FEATURE(BVH_HAIR) + case PRIMITIVE_CURVE: + case PRIMITIVE_MOTION_CURVE: { + const uint curve_type = kernel_tex_fetch(__prim_type, prim_addr); + if(kernel_data.curve.curveflags & CURVE_KN_INTERPOLATE) { + hit = cardinal_curve_intersect(kg, + isect_array, + P, + dir, + PATH_RAY_SHADOW, + object, + prim_addr, + ray->time, + curve_type, + NULL, + 0, 0); + } + else { + hit = curve_intersect(kg, + isect_array, + P, + dir, + PATH_RAY_SHADOW, + object, + prim_addr, + ray->time, + curve_type, + NULL, + 0, 0); + } + break; + } +#endif + default: { + hit = false; + break; + } + } + + /* Shadow ray early termination. */ + if(hit) { + /* detect if this surface has a shader with transparent shadows */ + + /* todo: optimize so primitive visibility flag indicates if + * the primitive has a transparent shadow shader? */ + int prim = kernel_tex_fetch(__prim_index, isect_array->prim); + int shader = 0; + +#ifdef __HAIR__ + if(kernel_tex_fetch(__prim_type, isect_array->prim) & PRIMITIVE_ALL_TRIANGLE) +#endif + { + shader = kernel_tex_fetch(__tri_shader, prim); + } +#ifdef __HAIR__ + else { + float4 str = kernel_tex_fetch(__curves, prim); + shader = __float_as_int(str.z); + } +#endif + int flag = kernel_tex_fetch(__shaders, (shader & SHADER_MASK)).flags; + + /* if no transparent shadows, all light is blocked */ + if(!(flag & SD_HAS_TRANSPARENT_SHADOW)) { + return true; + } + /* if maximum number of hits reached, block all light */ + else if(*num_hits == max_hits) { + return true; + } + + /* move on to next entry in intersections array */ + isect_array++; + (*num_hits)++; +#if BVH_FEATURE(BVH_INSTANCING) + num_hits_in_instance++; +#endif + + isect_array->t = isect_t; + } + + prim_addr++; + }//while prim + } + } +#if BVH_FEATURE(BVH_INSTANCING) + else { + /* Instance push. */ + object = kernel_tex_fetch(__prim_object, -prim_addr-1); + +# if BVH_FEATURE(BVH_MOTION) + isect_t = bvh_instance_motion_push(kg, object, ray, &P, &dir, &idir, isect_t, &ob_itfm); +# else + isect_t = bvh_instance_push(kg, object, ray, &P, &dir, &idir, isect_t); +# endif + + num_hits_in_instance = 0; + isect_array->t = isect_t; + + obvh_near_far_idx_calc(idir, + &near_x, &near_y, &near_z, + &far_x, &far_y, &far_z); + tfar = avxf(isect_t); +# if BVH_FEATURE(BVH_HAIR) + dir4 = avx3f(avxf(dir.x), avxf(dir.y), avxf(dir.z)); +# endif + idir4 = avx3f(avxf(idir.x), avxf(idir.y), avxf(idir.z)); +# ifdef __KERNEL_AVX2__ + P_idir = P*idir; + P_idir4 = avx3f(P_idir.x, P_idir.y, P_idir.z); +# endif +# if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__) + org4 = avx3f(avxf(P.x), avxf(P.y), avxf(P.z)); +# endif + + ++stack_ptr; + kernel_assert(stack_ptr < BVH_OSTACK_SIZE); + traversal_stack[stack_ptr].addr = ENTRYPOINT_SENTINEL; + + node_addr = kernel_tex_fetch(__object_node, object); + + } + } +#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(num_hits_in_instance) { + float t_fac; +# if BVH_FEATURE(BVH_MOTION) + bvh_instance_motion_pop_factor(kg, object, ray, &P, &dir, &idir, &t_fac, &ob_itfm); +# else + bvh_instance_pop_factor(kg, object, ray, &P, &dir, &idir, &t_fac); +# endif + /* Scale isect->t to adjust for instancing. */ + for(int i = 0; i < num_hits_in_instance; i++) { + (isect_array-i-1)->t *= t_fac; + } + } + else { +# if BVH_FEATURE(BVH_MOTION) + bvh_instance_motion_pop(kg, object, ray, &P, &dir, &idir, FLT_MAX, &ob_itfm); +# else + bvh_instance_pop(kg, object, ray, &P, &dir, &idir, FLT_MAX); +# endif + } + + isect_t = tmax; + isect_array->t = isect_t; + + obvh_near_far_idx_calc(idir, + &near_x, &near_y, &near_z, + &far_x, &far_y, &far_z); + tfar = avxf(isect_t); +# if BVH_FEATURE(BVH_HAIR) + dir4 = avx3f(avxf(dir.x), avxf(dir.y), avxf(dir.z)); +# endif + idir4 = avx3f(avxf(idir.x), avxf(idir.y), avxf(idir.z)); +# ifdef __KERNEL_AVX2__ + P_idir = P*idir; + P_idir4 = avx3f(P_idir.x, P_idir.y, P_idir.z); +# endif +# if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__) + org4 = avx3f(avxf(P.x), avxf(P.y), avxf(P.z)); +# endif + + object = OBJECT_NONE; + node_addr = traversal_stack[stack_ptr].addr; + --stack_ptr; + } +#endif /* FEATURE(BVH_INSTANCING) */ + } while(node_addr != ENTRYPOINT_SENTINEL); + + return false; +} + +#undef NODE_INTERSECT |