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/*
* Copyright 2018 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.
*/
#pragma once
CCL_NAMESPACE_BEGIN
/* Element of ID pass stored in the render buffers.
* It is `float2` semantically, but it must be unaligned since the offset of ID passes in the
* render buffers might not meet expected by compiler alignment. */
typedef struct IDPassBufferElement {
float x;
float y;
} IDPassBufferElement;
ccl_device_inline void kernel_write_id_slots(ccl_global float *buffer,
int num_slots,
float id,
float weight)
{
kernel_assert(id != ID_NONE);
if (weight == 0.0f) {
return;
}
for (int slot = 0; slot < num_slots; slot++) {
ccl_global IDPassBufferElement *id_buffer = (ccl_global IDPassBufferElement *)buffer;
#ifdef __ATOMIC_PASS_WRITE__
/* If the loop reaches an empty slot, the ID isn't in any slot yet - so add it! */
if (id_buffer[slot].x == ID_NONE) {
/* Use an atomic to claim this slot.
* If a different thread got here first, try again from this slot on. */
float old_id = atomic_compare_and_swap_float(buffer + slot * 2, ID_NONE, id);
if (old_id != ID_NONE && old_id != id) {
continue;
}
atomic_add_and_fetch_float(buffer + slot * 2 + 1, weight);
break;
}
/* If there already is a slot for that ID, add the weight.
* If no slot was found, add it to the last. */
else if (id_buffer[slot].x == id || slot == num_slots - 1) {
atomic_add_and_fetch_float(buffer + slot * 2 + 1, weight);
break;
}
#else /* __ATOMIC_PASS_WRITE__ */
/* If the loop reaches an empty slot, the ID isn't in any slot yet - so add it! */
if (id_buffer[slot].x == ID_NONE) {
id_buffer[slot].x = id;
id_buffer[slot].y = weight;
break;
}
/* If there already is a slot for that ID, add the weight.
* If no slot was found, add it to the last. */
else if (id_buffer[slot].x == id || slot == num_slots - 1) {
id_buffer[slot].y += weight;
break;
}
#endif /* __ATOMIC_PASS_WRITE__ */
}
}
ccl_device_inline void kernel_sort_id_slots(ccl_global float *buffer, int num_slots)
{
ccl_global IDPassBufferElement *id_buffer = (ccl_global IDPassBufferElement *)buffer;
for (int slot = 1; slot < num_slots; ++slot) {
if (id_buffer[slot].x == ID_NONE) {
return;
}
/* Since we're dealing with a tiny number of elements, insertion sort should be fine. */
int i = slot;
while (i > 0 && id_buffer[i].y > id_buffer[i - 1].y) {
const IDPassBufferElement swap = id_buffer[i];
id_buffer[i] = id_buffer[i - 1];
id_buffer[i - 1] = swap;
--i;
}
}
}
/* post-sorting for Cryptomatte */
ccl_device_inline void kernel_cryptomatte_post(KernelGlobals kg,
ccl_global float *render_buffer,
int pixel_index)
{
const int pass_stride = kernel_data.film.pass_stride;
const uint64_t render_buffer_offset = (uint64_t)pixel_index * pass_stride;
ccl_global float *cryptomatte_buffer = render_buffer + render_buffer_offset +
kernel_data.film.pass_cryptomatte;
kernel_sort_id_slots(cryptomatte_buffer, 2 * kernel_data.film.cryptomatte_depth);
}
CCL_NAMESPACE_END
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