diff options
Diffstat (limited to 'intern/cycles/kernel/bvh/util.h')
| -rw-r--r-- | intern/cycles/kernel/bvh/util.h | 82 |
1 files changed, 67 insertions, 15 deletions
diff --git a/intern/cycles/kernel/bvh/util.h b/intern/cycles/kernel/bvh/util.h index d53198f97a3..a57703a8b8c 100644 --- a/intern/cycles/kernel/bvh/util.h +++ b/intern/cycles/kernel/bvh/util.h @@ -5,7 +5,59 @@ CCL_NAMESPACE_BEGIN -#if defined(__KERNEL_CPU__) +ccl_device_inline bool intersection_ray_valid(ccl_private const Ray *ray) +{ + /* NOTE: Due to some vectorization code non-finite origin point might + * cause lots of false-positive intersections which will overflow traversal + * stack. + * This code is a quick way to perform early output, to avoid crashes in + * such cases. + * From production scenes so far it seems it's enough to test first element + * only. + * Scene intersection may also called with empty rays for conditional trace + * calls that evaluate to false, so filter those out. + */ + return isfinite_safe(ray->P.x) && isfinite_safe(ray->D.x) && len_squared(ray->D) != 0.0f; +} + +/* Offset intersection distance by the smallest possible amount, to skip + * intersections at this distance. This works in cases where the ray start + * position is unchanged and only tmin is updated, since for self + * intersection we'll be comparing against the exact same distances. */ +ccl_device_forceinline float intersection_t_offset(const float t) +{ + /* This is a simplified version of `nextafterf(t, FLT_MAX)`, only dealing with + * non-negative and finite t. */ + kernel_assert(t >= 0.0f && isfinite_safe(t)); + const uint32_t bits = (t == 0.0f) ? 1 : __float_as_uint(t) + 1; + return __uint_as_float(bits); +} + +/* Ray offset to avoid self intersection. + * + * This function can be used to compute a modified ray start position for rays + * leaving from a surface. This is from: + * "A Fast and Robust Method for Avoiding Self-Intersection" + * Ray Tracing Gems, chapter 6. + */ +ccl_device_inline float3 ray_offset(const float3 P, const float3 Ng) +{ + const float int_scale = 256.0f; + const int3 of_i = make_int3( + (int)(int_scale * Ng.x), (int)(int_scale * Ng.y), (int)(int_scale * Ng.z)); + + const float3 p_i = make_float3( + __int_as_float(__float_as_int(P.x) + ((P.x < 0) ? -of_i.x : of_i.x)), + __int_as_float(__float_as_int(P.y) + ((P.y < 0) ? -of_i.y : of_i.y)), + __int_as_float(__float_as_int(P.z) + ((P.z < 0) ? -of_i.z : of_i.z))); + const float origin = 1.0f / 32.0f; + const float float_scale = 1.0f / 65536.0f; + return make_float3(fabsf(P.x) < origin ? P.x + float_scale * Ng.x : p_i.x, + fabsf(P.y) < origin ? P.y + float_scale * Ng.y : p_i.y, + fabsf(P.z) < origin ? P.z + float_scale * Ng.z : p_i.z); +} + +#ifndef __KERNEL_GPU__ ccl_device int intersections_compare(const void *a, const void *b) { const Intersection *isect_a = (const Intersection *)a; @@ -53,20 +105,20 @@ ccl_device_forceinline int intersection_get_shader_flags(KernelGlobals kg, int shader = 0; if (type & PRIMITIVE_TRIANGLE) { - shader = kernel_tex_fetch(__tri_shader, prim); + shader = kernel_data_fetch(tri_shader, prim); } #ifdef __POINTCLOUD__ else if (type & PRIMITIVE_POINT) { - shader = kernel_tex_fetch(__points_shader, prim); + shader = kernel_data_fetch(points_shader, prim); } #endif #ifdef __HAIR__ else if (type & PRIMITIVE_CURVE) { - shader = kernel_tex_fetch(__curves, prim).shader_id; + shader = kernel_data_fetch(curves, prim).shader_id; } #endif - return kernel_tex_fetch(__shaders, (shader & SHADER_MASK)).flags; + return kernel_data_fetch(shaders, (shader & SHADER_MASK)).flags; } ccl_device_forceinline int intersection_get_shader_from_isect_prim(KernelGlobals kg, @@ -76,16 +128,16 @@ ccl_device_forceinline int intersection_get_shader_from_isect_prim(KernelGlobals int shader = 0; if (isect_type & PRIMITIVE_TRIANGLE) { - shader = kernel_tex_fetch(__tri_shader, prim); + shader = kernel_data_fetch(tri_shader, prim); } #ifdef __POINTCLOUD__ else if (isect_type & PRIMITIVE_POINT) { - shader = kernel_tex_fetch(__points_shader, prim); + shader = kernel_data_fetch(points_shader, prim); } #endif #ifdef __HAIR__ else if (isect_type & PRIMITIVE_CURVE) { - shader = kernel_tex_fetch(__curves, prim).shader_id; + shader = kernel_data_fetch(curves, prim).shader_id; } #endif @@ -101,7 +153,7 @@ ccl_device_forceinline int intersection_get_shader( ccl_device_forceinline int intersection_get_object_flags( KernelGlobals kg, ccl_private const Intersection *ccl_restrict isect) { - return kernel_tex_fetch(__object_flag, isect->object); + return kernel_data_fetch(object_flag, isect->object); } /* TODO: find a better (faster) solution for this. Maybe store offset per object for @@ -110,8 +162,8 @@ ccl_device_inline int intersection_find_attribute(KernelGlobals kg, const int object, const uint id) { - uint attr_offset = kernel_tex_fetch(__objects, object).attribute_map_offset; - AttributeMap attr_map = kernel_tex_fetch(__attributes_map, attr_offset); + uint attr_offset = kernel_data_fetch(objects, object).attribute_map_offset; + AttributeMap attr_map = kernel_data_fetch(attributes_map, attr_offset); while (attr_map.id != id) { if (UNLIKELY(attr_map.id == ATTR_STD_NONE)) { @@ -126,7 +178,7 @@ ccl_device_inline int intersection_find_attribute(KernelGlobals kg, else { attr_offset += ATTR_PRIM_TYPES; } - attr_map = kernel_tex_fetch(__attributes_map, attr_offset); + attr_map = kernel_data_fetch(attributes_map, attr_offset); } /* return result */ @@ -151,12 +203,12 @@ ccl_device_inline float intersection_curve_shadow_transparency(KernelGlobals kg, } /* Interpolate transparency between curve keys. */ - const KernelCurve kcurve = kernel_tex_fetch(__curves, prim); + const KernelCurve kcurve = kernel_data_fetch(curves, prim); const int k0 = kcurve.first_key + PRIMITIVE_UNPACK_SEGMENT(kcurve.type); const int k1 = k0 + 1; - const float f0 = kernel_tex_fetch(__attributes_float, offset + k0); - const float f1 = kernel_tex_fetch(__attributes_float, offset + k1); + const float f0 = kernel_data_fetch(attributes_float, offset + k0); + const float f1 = kernel_data_fetch(attributes_float, offset + k1); return (1.0f - u) * f0 + u * f1; } |