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https://github.com/blender/blender
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96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
/* SPDX-FileCopyrightText: 2018-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#pragma once
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#include "kernel/globals.h"
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CCL_NAMESPACE_BEGIN
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/* Element of ID pass stored in the render buffers.
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* It is `float2` semantically, but it must be unaligned since the offset of ID passes in the
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* render buffers might not meet expected by compiler alignment. */
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struct CryptoPassBufferElement {
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float x;
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float y;
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};
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ccl_device_inline void film_write_cryptomatte_slots(ccl_global float *buffer,
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const int num_slots,
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const float id,
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const 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 CryptoPassBufferElement *id_buffer = (ccl_global CryptoPassBufferElement *)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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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 film_sort_cryptomatte_slots(ccl_global float *buffer, const int num_slots)
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{
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ccl_global CryptoPassBufferElement *id_buffer = (ccl_global CryptoPassBufferElement *)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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const CryptoPassBufferElement 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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/* post-sorting for Cryptomatte */
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ccl_device_inline void film_cryptomatte_post(KernelGlobals kg,
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ccl_global float *render_buffer,
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const int pixel_index)
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{
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const int pass_stride = kernel_data.film.pass_stride;
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const uint64_t render_buffer_offset = (uint64_t)pixel_index * pass_stride;
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ccl_global float *cryptomatte_buffer = render_buffer + render_buffer_offset +
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kernel_data.film.pass_cryptomatte;
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film_sort_cryptomatte_slots(cryptomatte_buffer, 2 * kernel_data.film.cryptomatte_depth);
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}
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CCL_NAMESPACE_END
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