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|
/* SPDX-License-Identifier: Apache-2.0
* Copyright 2021-2022 Blender Foundation */
/* Metal kernel entry points. */
#include "kernel/device/metal/compat.h"
#include "kernel/device/metal/globals.h"
#include "kernel/device/metal/function_constants.h"
#include "kernel/device/gpu/kernel.h"
/* MetalRT intersection handlers. */
#ifdef __METALRT__
/* Intersection return types. */
/* For a bounding box intersection function. */
struct BoundingBoxIntersectionResult {
bool accept [[accept_intersection]];
bool continue_search [[continue_search]];
float distance [[distance]];
};
/* For a triangle intersection function. */
struct TriangleIntersectionResult {
bool accept [[accept_intersection]];
bool continue_search [[continue_search]];
};
enum { METALRT_HIT_TRIANGLE, METALRT_HIT_BOUNDING_BOX };
/* Utilities. */
ccl_device_inline bool intersection_skip_self(ray_data const RaySelfPrimitives &self,
const int object,
const int prim)
{
return (self.prim == prim) && (self.object == object);
}
ccl_device_inline bool intersection_skip_self_shadow(ray_data const RaySelfPrimitives &self,
const int object,
const int prim)
{
return ((self.prim == prim) && (self.object == object)) ||
((self.light_prim == prim) && (self.light_object == object));
}
ccl_device_inline bool intersection_skip_self_local(ray_data const RaySelfPrimitives &self,
const int prim)
{
return (self.prim == prim);
}
/* Hit functions. */
template<typename TReturn, uint intersection_type>
TReturn metalrt_local_hit(constant KernelParamsMetal &launch_params_metal,
ray_data MetalKernelContext::MetalRTIntersectionLocalPayload &payload,
const uint object,
const uint primitive_id,
const float2 barycentrics,
const float ray_tmax)
{
TReturn result;
#ifdef __BVH_LOCAL__
uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
if ((object != payload.local_object) || intersection_skip_self_local(payload.self, prim)) {
/* Only intersect with matching object and skip self-intersecton. */
result.accept = false;
result.continue_search = true;
return result;
}
const short max_hits = payload.max_hits;
if (max_hits == 0) {
/* Special case for when no hit information is requested, just report that something was hit */
payload.result = true;
result.accept = true;
result.continue_search = false;
return result;
}
int hit = 0;
if (payload.has_lcg_state) {
for (short i = min(max_hits, short(payload.local_isect.num_hits)) - 1; i >= 0; --i) {
if (ray_tmax == payload.local_isect.hits[i].t) {
result.accept = false;
result.continue_search = true;
return result;
}
}
hit = payload.local_isect.num_hits++;
if (payload.local_isect.num_hits > max_hits) {
hit = lcg_step_uint(&payload.lcg_state) % payload.local_isect.num_hits;
if (hit >= max_hits) {
result.accept = false;
result.continue_search = true;
return result;
}
}
}
else {
if (payload.local_isect.num_hits && ray_tmax > payload.local_isect.hits[0].t) {
/* Record closest intersection only. Do not terminate ray here, since there is no guarantee
* about distance ordering in any-hit */
result.accept = false;
result.continue_search = true;
return result;
}
payload.local_isect.num_hits = 1;
}
ray_data Intersection *isect = &payload.local_isect.hits[hit];
isect->t = ray_tmax;
isect->prim = prim;
isect->object = object;
isect->type = kernel_data_fetch(objects, object).primitive_type;
isect->u = barycentrics.x;
isect->v = barycentrics.y;
/* Record geometric normal */
const uint tri_vindex = kernel_data_fetch(tri_vindex, isect->prim).w;
const float3 tri_a = float3(kernel_data_fetch(tri_verts, tri_vindex + 0));
const float3 tri_b = float3(kernel_data_fetch(tri_verts, tri_vindex + 1));
const float3 tri_c = float3(kernel_data_fetch(tri_verts, tri_vindex + 2));
payload.local_isect.Ng[hit] = normalize(cross(tri_b - tri_a, tri_c - tri_a));
/* Continue tracing (without this the trace call would return after the first hit) */
result.accept = false;
result.continue_search = true;
return result;
#endif
}
[[intersection(triangle, triangle_data, METALRT_TAGS)]] TriangleIntersectionResult
__anyhit__cycles_metalrt_local_hit_tri(
constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionLocalPayload &payload [[payload]],
uint instance_id [[user_instance_id]],
uint primitive_id [[primitive_id]],
float2 barycentrics [[barycentric_coord]],
float ray_tmax [[distance]])
{
return metalrt_local_hit<TriangleIntersectionResult, METALRT_HIT_TRIANGLE>(
launch_params_metal, payload, instance_id, primitive_id, barycentrics, ray_tmax);
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__anyhit__cycles_metalrt_local_hit_box(const float ray_tmax [[max_distance]])
{
/* unused function */
BoundingBoxIntersectionResult result;
result.distance = ray_tmax;
result.accept = false;
result.continue_search = false;
return result;
}
template<uint intersection_type>
bool metalrt_shadow_all_hit(constant KernelParamsMetal &launch_params_metal,
ray_data MetalKernelContext::MetalRTIntersectionShadowPayload &payload,
uint object,
uint prim,
const float2 barycentrics,
const float ray_tmax)
{
#ifdef __SHADOW_RECORD_ALL__
# ifdef __VISIBILITY_FLAG__
const uint visibility = payload.visibility;
if ((kernel_data_fetch(objects, object).visibility & visibility) == 0) {
/* continue search */
return true;
}
# endif
const float u = barycentrics.x;
const float v = barycentrics.y;
int type = 0;
if (intersection_type == METALRT_HIT_TRIANGLE) {
type = kernel_data_fetch(objects, object).primitive_type;
}
# ifdef __HAIR__
else {
const KernelCurveSegment segment = kernel_data_fetch(curve_segments, prim);
type = segment.type;
prim = segment.prim;
/* Filter out curve endcaps */
if (u == 0.0f || u == 1.0f) {
/* continue search */
return true;
}
}
# endif
if (intersection_skip_self_shadow(payload.self, object, prim)) {
/* continue search */
return true;
}
# ifndef __TRANSPARENT_SHADOWS__
/* No transparent shadows support compiled in, make opaque. */
payload.result = true;
/* terminate ray */
return false;
# else
short max_hits = payload.max_hits;
short num_hits = payload.num_hits;
short num_recorded_hits = payload.num_recorded_hits;
MetalKernelContext context(launch_params_metal);
/* If no transparent shadows, all light is blocked and we can stop immediately. */
if (num_hits >= max_hits ||
!(context.intersection_get_shader_flags(NULL, prim, type) & SD_HAS_TRANSPARENT_SHADOW)) {
payload.result = true;
/* terminate ray */
return false;
}
/* Always use baked shadow transparency for curves. */
if (type & PRIMITIVE_CURVE) {
float throughput = payload.throughput;
throughput *= context.intersection_curve_shadow_transparency(nullptr, object, prim, u);
payload.throughput = throughput;
payload.num_hits += 1;
if (throughput < CURVE_SHADOW_TRANSPARENCY_CUTOFF) {
/* Accept result and terminate if throughput is sufficiently low */
payload.result = true;
return false;
}
else {
return true;
}
}
payload.num_hits += 1;
payload.num_recorded_hits += 1;
uint record_index = num_recorded_hits;
const IntegratorShadowState state = payload.state;
const uint max_record_hits = min(uint(max_hits), INTEGRATOR_SHADOW_ISECT_SIZE);
if (record_index >= max_record_hits) {
/* If maximum number of hits reached, find a hit to replace. */
float max_recorded_t = INTEGRATOR_STATE_ARRAY(state, shadow_isect, 0, t);
uint max_recorded_hit = 0;
for (int i = 1; i < max_record_hits; i++) {
const float isect_t = INTEGRATOR_STATE_ARRAY(state, shadow_isect, i, t);
if (isect_t > max_recorded_t) {
max_recorded_t = isect_t;
max_recorded_hit = i;
}
}
if (ray_tmax >= max_recorded_t) {
/* Accept hit, so that we don't consider any more hits beyond the distance of the
* current hit anymore. */
payload.result = true;
return true;
}
record_index = max_recorded_hit;
}
INTEGRATOR_STATE_ARRAY_WRITE(state, shadow_isect, record_index, u) = u;
INTEGRATOR_STATE_ARRAY_WRITE(state, shadow_isect, record_index, v) = v;
INTEGRATOR_STATE_ARRAY_WRITE(state, shadow_isect, record_index, t) = ray_tmax;
INTEGRATOR_STATE_ARRAY_WRITE(state, shadow_isect, record_index, prim) = prim;
INTEGRATOR_STATE_ARRAY_WRITE(state, shadow_isect, record_index, object) = object;
INTEGRATOR_STATE_ARRAY_WRITE(state, shadow_isect, record_index, type) = type;
/* Continue tracing. */
# endif /* __TRANSPARENT_SHADOWS__ */
#endif /* __SHADOW_RECORD_ALL__ */
return true;
}
[[intersection(triangle, triangle_data, METALRT_TAGS)]] TriangleIntersectionResult
__anyhit__cycles_metalrt_shadow_all_hit_tri(
constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionShadowPayload &payload [[payload]],
unsigned int object [[user_instance_id]],
unsigned int primitive_id [[primitive_id]],
float2 barycentrics [[barycentric_coord]],
float ray_tmax [[distance]])
{
uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
TriangleIntersectionResult result;
result.continue_search = metalrt_shadow_all_hit<METALRT_HIT_TRIANGLE>(
launch_params_metal, payload, object, prim, barycentrics, ray_tmax);
result.accept = !result.continue_search;
return result;
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__anyhit__cycles_metalrt_shadow_all_hit_box(const float ray_tmax [[max_distance]])
{
/* unused function */
BoundingBoxIntersectionResult result;
result.distance = ray_tmax;
result.accept = false;
result.continue_search = false;
return result;
}
template<typename TReturnType, uint intersection_type>
inline TReturnType metalrt_visibility_test(
constant KernelParamsMetal &launch_params_metal,
ray_data MetalKernelContext::MetalRTIntersectionPayload &payload,
const uint object,
const uint prim,
const float u)
{
TReturnType result;
#ifdef __HAIR__
if (intersection_type == METALRT_HIT_BOUNDING_BOX) {
/* Filter out curve endcaps. */
if (u == 0.0f || u == 1.0f) {
result.accept = false;
result.continue_search = true;
return result;
}
}
#endif
uint visibility = payload.visibility;
#ifdef __VISIBILITY_FLAG__
if ((kernel_data_fetch(objects, object).visibility & visibility) == 0) {
result.accept = false;
result.continue_search = true;
return result;
}
#endif
if (intersection_type == METALRT_HIT_TRIANGLE) {
}
# ifdef __HAIR__
else {
prim = kernel_data_fetch(curve_segments, prim).prim;
}
# endif
/* Shadow ray early termination. */
if (visibility & PATH_RAY_SHADOW_OPAQUE) {
if (intersection_skip_self_shadow(payload.self, object, prim)) {
result.accept = false;
result.continue_search = true;
return result;
}
else {
result.accept = true;
result.continue_search = false;
return result;
}
}
else {
if (intersection_skip_self(payload.self, object, prim)) {
result.accept = false;
result.continue_search = true;
return result;
}
}
result.accept = true;
result.continue_search = true;
return result;
}
[[intersection(triangle, triangle_data, METALRT_TAGS)]] TriangleIntersectionResult
__anyhit__cycles_metalrt_visibility_test_tri(
constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionPayload &payload [[payload]],
unsigned int object [[user_instance_id]],
unsigned int primitive_id [[primitive_id]])
{
uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
TriangleIntersectionResult result =
metalrt_visibility_test<TriangleIntersectionResult, METALRT_HIT_TRIANGLE>(
launch_params_metal, payload, object, prim, 0.0f);
if (result.accept) {
payload.prim = prim;
payload.type = kernel_data_fetch(objects, object).primitive_type;
}
return result;
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__anyhit__cycles_metalrt_visibility_test_box(const float ray_tmax [[max_distance]])
{
/* Unused function */
BoundingBoxIntersectionResult result;
result.accept = false;
result.continue_search = true;
result.distance = ray_tmax;
return result;
}
/* Primitive intersection functions. */
#ifdef __HAIR__
ccl_device_inline void metalrt_intersection_curve(
constant KernelParamsMetal &launch_params_metal,
ray_data MetalKernelContext::MetalRTIntersectionPayload &payload,
const uint object,
const uint prim,
const uint type,
const float3 ray_P,
const float3 ray_D,
float time,
const float ray_tmin,
const float ray_tmax,
thread BoundingBoxIntersectionResult &result)
{
# ifdef __VISIBILITY_FLAG__
const uint visibility = payload.visibility;
if ((kernel_data_fetch(objects, object).visibility & visibility) == 0) {
return;
}
# endif
Intersection isect;
isect.t = ray_tmax;
MetalKernelContext context(launch_params_metal);
if (context.curve_intersect(
NULL, &isect, ray_P, ray_D, ray_tmin, isect.t, object, prim, time, type)) {
result = metalrt_visibility_test<BoundingBoxIntersectionResult, METALRT_HIT_BOUNDING_BOX>(
launch_params_metal, payload, object, prim, isect.u);
if (result.accept) {
result.distance = isect.t;
payload.u = isect.u;
payload.v = isect.v;
payload.prim = prim;
payload.type = type;
}
}
}
ccl_device_inline void metalrt_intersection_curve_shadow(
constant KernelParamsMetal &launch_params_metal,
ray_data MetalKernelContext::MetalRTIntersectionShadowPayload &payload,
const uint object,
const uint prim,
const uint type,
const float3 ray_P,
const float3 ray_D,
float time,
const float ray_tmin,
const float ray_tmax,
thread BoundingBoxIntersectionResult &result)
{
const uint visibility = payload.visibility;
Intersection isect;
isect.t = ray_tmax;
MetalKernelContext context(launch_params_metal);
if (context.curve_intersect(
NULL, &isect, ray_P, ray_D, ray_tmin, isect.t, object, prim, time, type)) {
result.continue_search = metalrt_shadow_all_hit<METALRT_HIT_BOUNDING_BOX>(
launch_params_metal, payload, object, prim, float2(isect.u, isect.v), ray_tmax);
result.accept = !result.continue_search;
}
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__intersection__curve_ribbon(constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionPayload &payload
[[payload]],
const uint object [[user_instance_id]],
const uint primitive_id [[primitive_id]],
const float3 ray_P [[origin]],
const float3 ray_D [[direction]],
const float ray_tmin [[min_distance]],
const float ray_tmax [[max_distance]])
{
uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
const KernelCurveSegment segment = kernel_data_fetch(curve_segments, prim);
BoundingBoxIntersectionResult result;
result.accept = false;
result.continue_search = true;
result.distance = ray_tmax;
if (segment.type & PRIMITIVE_CURVE_RIBBON) {
metalrt_intersection_curve(launch_params_metal,
payload,
object,
segment.prim,
segment.type,
ray_P,
ray_D,
# if defined(__METALRT_MOTION__)
payload.time,
# else
0.0f,
# endif
ray_tmin,
ray_tmax,
result);
}
return result;
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__intersection__curve_ribbon_shadow(
constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionShadowPayload &payload [[payload]],
const uint object [[user_instance_id]],
const uint primitive_id [[primitive_id]],
const float3 ray_P [[origin]],
const float3 ray_D [[direction]],
const float ray_tmin [[min_distance]],
const float ray_tmax [[max_distance]])
{
uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
const KernelCurveSegment segment = kernel_data_fetch(curve_segments, prim);
BoundingBoxIntersectionResult result;
result.accept = false;
result.continue_search = true;
result.distance = ray_tmax;
if (segment.type & PRIMITIVE_CURVE_RIBBON) {
metalrt_intersection_curve_shadow(launch_params_metal,
payload,
object,
segment.prim,
segment.type,
ray_P,
ray_D,
# if defined(__METALRT_MOTION__)
payload.time,
# else
0.0f,
# endif
ray_tmin,
ray_tmax,
result);
}
return result;
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__intersection__curve_all(constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionPayload &payload
[[payload]],
const uint object [[user_instance_id]],
const uint primitive_id [[primitive_id]],
const float3 ray_P [[origin]],
const float3 ray_D [[direction]],
const float ray_tmin [[min_distance]],
const float ray_tmax [[max_distance]])
{
uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
const KernelCurveSegment segment = kernel_data_fetch(curve_segments, prim);
BoundingBoxIntersectionResult result;
result.accept = false;
result.continue_search = true;
result.distance = ray_tmax;
metalrt_intersection_curve(launch_params_metal,
payload,
object,
segment.prim,
segment.type,
ray_P,
ray_D,
# if defined(__METALRT_MOTION__)
payload.time,
# else
0.0f,
# endif
ray_tmin,
ray_tmax,
result);
return result;
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__intersection__curve_all_shadow(
constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionShadowPayload &payload [[payload]],
const uint object [[user_instance_id]],
const uint primitive_id [[primitive_id]],
const float3 ray_P [[origin]],
const float3 ray_D [[direction]],
const float ray_tmin [[min_distance]],
const float ray_tmax [[max_distance]])
{
uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
const KernelCurveSegment segment = kernel_data_fetch(curve_segments, prim);
BoundingBoxIntersectionResult result;
result.accept = false;
result.continue_search = true;
result.distance = ray_tmax;
metalrt_intersection_curve_shadow(launch_params_metal,
payload,
object,
segment.prim,
segment.type,
ray_P,
ray_D,
# if defined(__METALRT_MOTION__)
payload.time,
# else
0.0f,
# endif
ray_tmin,
ray_tmax,
result);
return result;
}
#endif /* __HAIR__ */
#ifdef __POINTCLOUD__
ccl_device_inline void metalrt_intersection_point(
constant KernelParamsMetal &launch_params_metal,
ray_data MetalKernelContext::MetalRTIntersectionPayload &payload,
const uint object,
const uint prim,
const uint type,
const float3 ray_P,
const float3 ray_D,
float time,
const float ray_tmin,
const float ray_tmax,
thread BoundingBoxIntersectionResult &result)
{
# ifdef __VISIBILITY_FLAG__
const uint visibility = payload.visibility;
if ((kernel_data_fetch(objects, object).visibility & visibility) == 0) {
return;
}
# endif
Intersection isect;
isect.t = ray_tmax;
MetalKernelContext context(launch_params_metal);
if (context.point_intersect(
NULL, &isect, ray_P, ray_D, ray_tmin, isect.t, object, prim, time, type)) {
result = metalrt_visibility_test<BoundingBoxIntersectionResult, METALRT_HIT_BOUNDING_BOX>(
launch_params_metal, payload, object, prim, isect.u);
if (result.accept) {
result.distance = isect.t;
payload.u = isect.u;
payload.v = isect.v;
payload.prim = prim;
payload.type = type;
}
}
}
ccl_device_inline void metalrt_intersection_point_shadow(
constant KernelParamsMetal &launch_params_metal,
ray_data MetalKernelContext::MetalRTIntersectionShadowPayload &payload,
const uint object,
const uint prim,
const uint type,
const float3 ray_P,
const float3 ray_D,
float time,
const float ray_tmin,
const float ray_tmax,
thread BoundingBoxIntersectionResult &result)
{
const uint visibility = payload.visibility;
Intersection isect;
isect.t = ray_tmax;
MetalKernelContext context(launch_params_metal);
if (context.point_intersect(
NULL, &isect, ray_P, ray_D, ray_tmin, isect.t, object, prim, time, type)) {
result.continue_search = metalrt_shadow_all_hit<METALRT_HIT_BOUNDING_BOX>(
launch_params_metal, payload, object, prim, float2(isect.u, isect.v), ray_tmax);
result.accept = !result.continue_search;
if (result.accept) {
result.distance = isect.t;
}
}
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__intersection__point(constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionPayload &payload [[payload]],
const uint object [[user_instance_id]],
const uint primitive_id [[primitive_id]],
const float3 ray_origin [[origin]],
const float3 ray_direction [[direction]],
const float ray_tmin [[min_distance]],
const float ray_tmax [[max_distance]])
{
const uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
const int type = kernel_data_fetch(objects, object).primitive_type;
BoundingBoxIntersectionResult result;
result.accept = false;
result.continue_search = true;
result.distance = ray_tmax;
metalrt_intersection_point(launch_params_metal,
payload,
object,
prim,
type,
ray_origin,
ray_direction,
# if defined(__METALRT_MOTION__)
payload.time,
# else
0.0f,
# endif
ray_tmin,
ray_tmax,
result);
return result;
}
[[intersection(bounding_box, triangle_data, METALRT_TAGS)]] BoundingBoxIntersectionResult
__intersection__point_shadow(constant KernelParamsMetal &launch_params_metal [[buffer(1)]],
ray_data MetalKernelContext::MetalRTIntersectionShadowPayload &payload
[[payload]],
const uint object [[user_instance_id]],
const uint primitive_id [[primitive_id]],
const float3 ray_origin [[origin]],
const float3 ray_direction [[direction]],
const float ray_tmin [[min_distance]],
const float ray_tmax [[max_distance]])
{
const uint prim = primitive_id + kernel_data_fetch(object_prim_offset, object);
const int type = kernel_data_fetch(objects, object).primitive_type;
BoundingBoxIntersectionResult result;
result.accept = false;
result.continue_search = true;
result.distance = ray_tmax;
metalrt_intersection_point_shadow(launch_params_metal,
payload,
object,
prim,
type,
ray_origin,
ray_direction,
# if defined(__METALRT_MOTION__)
payload.time,
# else
0.0f,
# endif
ray_tmin,
ray_tmax,
result);
return result;
}
#endif /* __POINTCLOUD__ */
#endif /* __METALRT__ */
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