forked from bartvdbraak/blender
106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/*
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* Copyright 2011-2018 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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ccl_device_noinline float svm_ao(KernelGlobals *kg,
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ShaderData *sd,
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float3 N,
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ccl_addr_space PathState *state,
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float max_dist,
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int num_samples,
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int flags)
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{
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if (flags & NODE_AO_GLOBAL_RADIUS) {
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max_dist = kernel_data.background.ao_distance;
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}
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/* Early out if no sampling needed. */
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if (max_dist <= 0.0f || num_samples < 1 || sd->object == OBJECT_NONE) {
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return 1.0f;
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}
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/* Can't raytrace from shaders like displacement, before BVH exists. */
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if (kernel_data.bvh.bvh_layout == BVH_LAYOUT_NONE) {
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return 1.0f;
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}
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if (flags & NODE_AO_INSIDE) {
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N = -N;
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}
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float3 T, B;
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make_orthonormals(N, &T, &B);
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int unoccluded = 0;
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for (int sample = 0; sample < num_samples; sample++) {
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float disk_u, disk_v;
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path_branched_rng_2D(
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kg, state->rng_hash, state, sample, num_samples, PRNG_BEVEL_U, &disk_u, &disk_v);
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float2 d = concentric_sample_disk(disk_u, disk_v);
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float3 D = make_float3(d.x, d.y, safe_sqrtf(1.0f - dot(d, d)));
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/* Create ray. */
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Ray ray;
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ray.P = ray_offset(sd->P, N);
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ray.D = D.x * T + D.y * B + D.z * N;
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ray.t = max_dist;
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ray.time = sd->time;
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ray.dP = sd->dP;
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ray.dD = differential3_zero();
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if (flags & NODE_AO_ONLY_LOCAL) {
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if (!scene_intersect_local(kg, ray, NULL, sd->object, NULL, 0)) {
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unoccluded++;
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}
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}
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else {
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Intersection isect;
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if (!scene_intersect(kg, ray, PATH_RAY_SHADOW_OPAQUE, &isect)) {
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unoccluded++;
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}
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}
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}
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return ((float)unoccluded) / num_samples;
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}
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ccl_device void svm_node_ao(
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KernelGlobals *kg, ShaderData *sd, ccl_addr_space PathState *state, float *stack, uint4 node)
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{
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uint flags, dist_offset, normal_offset, out_ao_offset;
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decode_node_uchar4(node.y, &flags, &dist_offset, &normal_offset, &out_ao_offset);
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uint color_offset, out_color_offset, samples;
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decode_node_uchar4(node.z, &color_offset, &out_color_offset, &samples, NULL);
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float dist = stack_load_float_default(stack, dist_offset, node.w);
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float3 normal = stack_valid(normal_offset) ? stack_load_float3(stack, normal_offset) : sd->N;
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float ao = svm_ao(kg, sd, normal, state, dist, samples, flags);
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if (stack_valid(out_ao_offset)) {
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stack_store_float(stack, out_ao_offset, ao);
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}
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if (stack_valid(out_color_offset)) {
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float3 color = stack_load_float3(stack, color_offset);
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stack_store_float3(stack, out_color_offset, ao * color);
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}
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}
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CCL_NAMESPACE_END
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