forked from bartvdbraak/blender
100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/*
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* Copyright 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_inline void kernel_write_id_slots(ccl_global float *buffer,
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int num_slots,
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float id,
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float weight)
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{
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kernel_assert(id != ID_NONE);
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if (weight == 0.0f) {
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return;
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}
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for (int slot = 0; slot < num_slots; slot++) {
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ccl_global float2 *id_buffer = (ccl_global float2 *)buffer;
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#ifdef __ATOMIC_PASS_WRITE__
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/* If the loop reaches an empty slot, the ID isn't in any slot yet - so add it! */
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if (id_buffer[slot].x == ID_NONE) {
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/* Use an atomic to claim this slot.
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* If a different thread got here first, try again from this slot on. */
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float old_id = atomic_compare_and_swap_float(buffer + slot * 2, ID_NONE, id);
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if (old_id != ID_NONE && old_id != id) {
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continue;
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}
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atomic_add_and_fetch_float(buffer + slot * 2 + 1, weight);
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break;
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}
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/* If there already is a slot for that ID, add the weight.
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* If no slot was found, add it to the last. */
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else if (id_buffer[slot].x == id || slot == num_slots - 1) {
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atomic_add_and_fetch_float(buffer + slot * 2 + 1, weight);
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break;
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}
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#else /* __ATOMIC_PASS_WRITE__ */
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/* If the loop reaches an empty slot, the ID isn't in any slot yet - so add it! */
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if (id_buffer[slot].x == ID_NONE) {
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id_buffer[slot].x = id;
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id_buffer[slot].y = weight;
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break;
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}
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/* If there already is a slot for that ID, add the weight.
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* If no slot was found, add it to the last. */
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else if (id_buffer[slot].x == id || slot == num_slots - 1) {
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id_buffer[slot].y += weight;
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break;
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}
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#endif /* __ATOMIC_PASS_WRITE__ */
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}
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}
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ccl_device_inline void kernel_sort_id_slots(ccl_global float *buffer, int num_slots)
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{
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ccl_global float2 *id_buffer = (ccl_global float2 *)buffer;
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for (int slot = 1; slot < num_slots; ++slot) {
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if (id_buffer[slot].x == ID_NONE) {
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return;
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}
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/* Since we're dealing with a tiny number of elements, insertion sort should be fine. */
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int i = slot;
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while (i > 0 && id_buffer[i].y > id_buffer[i - 1].y) {
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float2 swap = id_buffer[i];
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id_buffer[i] = id_buffer[i - 1];
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id_buffer[i - 1] = swap;
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--i;
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}
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}
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}
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#ifdef __KERNEL_GPU__
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/* post-sorting for Cryptomatte */
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ccl_device void kernel_cryptomatte_post(
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KernelGlobals *kg, ccl_global float *buffer, uint sample, int x, int y, int offset, int stride)
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{
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if (sample - 1 == kernel_data.integrator.aa_samples) {
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int index = offset + x + y * stride;
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int pass_stride = kernel_data.film.pass_stride;
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ccl_global float *cryptomatte_buffer = buffer + index * pass_stride +
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kernel_data.film.pass_cryptomatte;
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kernel_sort_id_slots(cryptomatte_buffer, 2 * kernel_data.film.cryptomatte_depth);
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}
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}
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#endif
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CCL_NAMESPACE_END
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