420 lines
14 KiB
C++
420 lines
14 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright 2017 Blender Foundation. All rights reserved. */
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/** \file
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* \ingroup draw
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*
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* \brief Curves API for render engines
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*/
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#include <cstring>
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#include "MEM_guardedalloc.h"
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#include "BLI_listbase.h"
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#include "BLI_math_base.h"
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#include "BLI_math_vec_types.hh"
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#include "BLI_math_vector.h"
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#include "BLI_math_vector.hh"
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#include "BLI_span.hh"
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#include "BLI_utildefines.h"
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#include "DNA_curves_types.h"
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#include "DNA_object_types.h"
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#include "DNA_scene_types.h"
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#include "BKE_curves.hh"
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#include "GPU_batch.h"
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#include "GPU_material.h"
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#include "GPU_texture.h"
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#include "DRW_render.h"
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#include "draw_cache_impl.h" /* own include */
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#include "draw_cache_inline.h"
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#include "draw_curves_private.h" /* own include */
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using blender::float3;
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using blender::IndexRange;
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using blender::Span;
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/* ---------------------------------------------------------------------- */
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/* Curves GPUBatch Cache */
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struct CurvesBatchCache {
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CurvesEvalCache curves_cache;
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GPUBatch *edit_points;
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/* To determine if cache is invalid. */
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bool is_dirty;
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};
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static bool curves_batch_cache_valid(const Curves &curves)
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{
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const CurvesBatchCache *cache = static_cast<CurvesBatchCache *>(curves.batch_cache);
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return (cache && cache->is_dirty == false);
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}
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static void curves_batch_cache_init(Curves &curves)
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{
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CurvesBatchCache *cache = static_cast<CurvesBatchCache *>(curves.batch_cache);
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if (!cache) {
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cache = MEM_cnew<CurvesBatchCache>(__func__);
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curves.batch_cache = cache;
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}
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else {
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memset(cache, 0, sizeof(*cache));
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}
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cache->is_dirty = false;
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}
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static void curves_batch_cache_clear_data(CurvesEvalCache &curves_cache)
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{
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/* TODO: more granular update tagging. */
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GPU_VERTBUF_DISCARD_SAFE(curves_cache.proc_point_buf);
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GPU_VERTBUF_DISCARD_SAFE(curves_cache.proc_length_buf);
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DRW_TEXTURE_FREE_SAFE(curves_cache.point_tex);
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DRW_TEXTURE_FREE_SAFE(curves_cache.length_tex);
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GPU_VERTBUF_DISCARD_SAFE(curves_cache.proc_strand_buf);
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GPU_VERTBUF_DISCARD_SAFE(curves_cache.proc_strand_seg_buf);
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DRW_TEXTURE_FREE_SAFE(curves_cache.strand_tex);
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DRW_TEXTURE_FREE_SAFE(curves_cache.strand_seg_tex);
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for (int i = 0; i < MAX_HAIR_SUBDIV; i++) {
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GPU_VERTBUF_DISCARD_SAFE(curves_cache.final[i].proc_buf);
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DRW_TEXTURE_FREE_SAFE(curves_cache.final[i].proc_tex);
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for (int j = 0; j < MAX_THICKRES; j++) {
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GPU_BATCH_DISCARD_SAFE(curves_cache.final[i].proc_hairs[j]);
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}
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}
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}
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static void curves_batch_cache_clear(Curves &curves)
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{
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CurvesBatchCache *cache = static_cast<CurvesBatchCache *>(curves.batch_cache);
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if (!cache) {
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return;
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}
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curves_batch_cache_clear_data(cache->curves_cache);
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GPU_BATCH_DISCARD_SAFE(cache->edit_points);
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}
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void DRW_curves_batch_cache_validate(Curves *curves)
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{
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if (!curves_batch_cache_valid(*curves)) {
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curves_batch_cache_clear(*curves);
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curves_batch_cache_init(*curves);
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}
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}
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static CurvesBatchCache &curves_batch_cache_get(Curves &curves)
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{
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DRW_curves_batch_cache_validate(&curves);
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return *static_cast<CurvesBatchCache *>(curves.batch_cache);
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}
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void DRW_curves_batch_cache_dirty_tag(Curves *curves, int mode)
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{
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CurvesBatchCache *cache = static_cast<CurvesBatchCache *>(curves->batch_cache);
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if (cache == nullptr) {
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return;
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}
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switch (mode) {
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case BKE_CURVES_BATCH_DIRTY_ALL:
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cache->is_dirty = true;
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break;
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default:
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BLI_assert(0);
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}
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}
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void DRW_curves_batch_cache_free(Curves *curves)
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{
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curves_batch_cache_clear(*curves);
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MEM_SAFE_FREE(curves->batch_cache);
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}
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static void ensure_seg_pt_count(const Curves &curves, CurvesEvalCache &curves_cache)
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{
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if (curves_cache.proc_point_buf != nullptr) {
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return;
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}
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curves_cache.strands_len = curves.geometry.curve_size;
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curves_cache.elems_len = curves.geometry.point_size + curves.geometry.curve_size;
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curves_cache.point_len = curves.geometry.point_size;
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}
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static void curves_batch_cache_fill_segments_proc_pos(const Curves &curves_id,
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GPUVertBufRaw &attr_step,
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GPUVertBufRaw &length_step)
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{
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/* TODO: use hair radius layer if available. */
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const int curve_size = curves_id.geometry.curve_size;
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const blender::bke::CurvesGeometry &curves = blender::bke::CurvesGeometry::wrap(
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curves_id.geometry);
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Span<float3> positions = curves.positions();
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for (const int i : IndexRange(curve_size)) {
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const IndexRange curve_range = curves.points_for_curve(i);
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Span<float3> curve_positions = positions.slice(curve_range);
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float total_len = 0.0f;
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float *seg_data_first;
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for (const int i_curve : curve_positions.index_range()) {
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float *seg_data = (float *)GPU_vertbuf_raw_step(&attr_step);
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copy_v3_v3(seg_data, curve_positions[i_curve]);
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if (i_curve == 0) {
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seg_data_first = seg_data;
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}
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else {
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total_len += blender::math::distance(curve_positions[i_curve - 1],
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curve_positions[i_curve]);
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}
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seg_data[3] = total_len;
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}
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/* Assign length value. */
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*(float *)GPU_vertbuf_raw_step(&length_step) = total_len;
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if (total_len > 0.0f) {
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/* Divide by total length to have a [0-1] number. */
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for ([[maybe_unused]] const int i_curve : curve_positions.index_range()) {
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seg_data_first[3] /= total_len;
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seg_data_first += 4;
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}
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}
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}
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}
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static void curves_batch_cache_ensure_procedural_pos(Curves &curves,
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CurvesEvalCache &cache,
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GPUMaterial *gpu_material)
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{
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if (cache.proc_point_buf == nullptr || DRW_vbo_requested(cache.proc_point_buf)) {
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/* Initialize vertex format. */
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GPUVertFormat format = {0};
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uint pos_id = GPU_vertformat_attr_add(&format, "posTime", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
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GPU_vertformat_alias_add(&format, "pos");
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cache.proc_point_buf = GPU_vertbuf_create_with_format(&format);
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GPU_vertbuf_data_alloc(cache.proc_point_buf, cache.point_len);
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GPUVertBufRaw point_step;
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GPU_vertbuf_attr_get_raw_data(cache.proc_point_buf, pos_id, &point_step);
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GPUVertFormat length_format = {0};
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uint length_id = GPU_vertformat_attr_add(
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&length_format, "hairLength", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
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cache.proc_length_buf = GPU_vertbuf_create_with_format(&length_format);
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GPU_vertbuf_data_alloc(cache.proc_length_buf, cache.strands_len);
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GPUVertBufRaw length_step;
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GPU_vertbuf_attr_get_raw_data(cache.proc_length_buf, length_id, &length_step);
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curves_batch_cache_fill_segments_proc_pos(curves, point_step, length_step);
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/* Create vbo immediately to bind to texture buffer. */
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GPU_vertbuf_use(cache.proc_point_buf);
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cache.point_tex = GPU_texture_create_from_vertbuf("hair_point", cache.proc_point_buf);
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}
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if (gpu_material && cache.proc_length_buf != nullptr && cache.length_tex) {
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ListBase gpu_attrs = GPU_material_attributes(gpu_material);
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LISTBASE_FOREACH (GPUMaterialAttribute *, attr, &gpu_attrs) {
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if (attr->type == CD_HAIRLENGTH) {
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GPU_vertbuf_use(cache.proc_length_buf);
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cache.length_tex = GPU_texture_create_from_vertbuf("hair_length", cache.proc_length_buf);
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break;
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}
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}
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}
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}
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static void curves_batch_cache_fill_strands_data(const Curves &curves_id,
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GPUVertBufRaw &data_step,
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GPUVertBufRaw &seg_step)
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{
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const blender::bke::CurvesGeometry &curves = blender::bke::CurvesGeometry::wrap(
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curves_id.geometry);
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for (const int i : IndexRange(curves.curves_num())) {
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const IndexRange curve_range = curves.points_for_curve(i);
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*(uint *)GPU_vertbuf_raw_step(&data_step) = curve_range.start();
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*(ushort *)GPU_vertbuf_raw_step(&seg_step) = curve_range.size() - 1;
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}
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}
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static void curves_batch_cache_ensure_procedural_strand_data(Curves &curves,
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CurvesEvalCache &cache)
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{
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GPUVertBufRaw data_step, seg_step;
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GPUVertFormat format_data = {0};
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uint data_id = GPU_vertformat_attr_add(&format_data, "data", GPU_COMP_U32, 1, GPU_FETCH_INT);
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GPUVertFormat format_seg = {0};
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uint seg_id = GPU_vertformat_attr_add(&format_seg, "data", GPU_COMP_U16, 1, GPU_FETCH_INT);
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/* Curve Data. */
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cache.proc_strand_buf = GPU_vertbuf_create_with_format(&format_data);
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GPU_vertbuf_data_alloc(cache.proc_strand_buf, cache.strands_len);
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GPU_vertbuf_attr_get_raw_data(cache.proc_strand_buf, data_id, &data_step);
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cache.proc_strand_seg_buf = GPU_vertbuf_create_with_format(&format_seg);
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GPU_vertbuf_data_alloc(cache.proc_strand_seg_buf, cache.strands_len);
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GPU_vertbuf_attr_get_raw_data(cache.proc_strand_seg_buf, seg_id, &seg_step);
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curves_batch_cache_fill_strands_data(curves, data_step, seg_step);
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/* Create vbo immediately to bind to texture buffer. */
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GPU_vertbuf_use(cache.proc_strand_buf);
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cache.strand_tex = GPU_texture_create_from_vertbuf("curves_strand", cache.proc_strand_buf);
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GPU_vertbuf_use(cache.proc_strand_seg_buf);
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cache.strand_seg_tex = GPU_texture_create_from_vertbuf("curves_strand_seg",
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cache.proc_strand_seg_buf);
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}
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static void curves_batch_cache_ensure_procedural_final_points(CurvesEvalCache &cache, int subdiv)
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{
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/* Same format as point_tex. */
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GPUVertFormat format = {0};
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GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 4, GPU_FETCH_FLOAT);
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cache.final[subdiv].proc_buf = GPU_vertbuf_create_with_format_ex(&format, GPU_USAGE_DEVICE_ONLY);
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/* Create a destination buffer for the transform feedback. Sized appropriately */
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/* Those are points! not line segments. */
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GPU_vertbuf_data_alloc(cache.final[subdiv].proc_buf,
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cache.final[subdiv].strands_res * cache.strands_len);
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/* Create vbo immediately to bind to texture buffer. */
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GPU_vertbuf_use(cache.final[subdiv].proc_buf);
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cache.final[subdiv].proc_tex = GPU_texture_create_from_vertbuf("hair_proc",
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cache.final[subdiv].proc_buf);
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}
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static void curves_batch_cache_fill_segments_indices(const Curves &curves,
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const int res,
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GPUIndexBufBuilder &elb)
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{
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const int curves_num = curves.geometry.curve_size;
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uint curr_point = 0;
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for ([[maybe_unused]] const int i : IndexRange(curves_num)) {
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for (int k = 0; k < res; k++) {
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GPU_indexbuf_add_generic_vert(&elb, curr_point++);
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}
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GPU_indexbuf_add_primitive_restart(&elb);
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}
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}
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static void curves_batch_cache_ensure_procedural_indices(Curves &curves,
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CurvesEvalCache &cache,
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const int thickness_res,
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const int subdiv)
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{
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BLI_assert(thickness_res <= MAX_THICKRES); /* Cylinder strip not currently supported. */
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if (cache.final[subdiv].proc_hairs[thickness_res - 1] != nullptr) {
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return;
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}
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int verts_per_curve = cache.final[subdiv].strands_res * thickness_res;
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/* +1 for primitive restart */
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int element_count = (verts_per_curve + 1) * cache.strands_len;
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GPUPrimType prim_type = (thickness_res == 1) ? GPU_PRIM_LINE_STRIP : GPU_PRIM_TRI_STRIP;
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static GPUVertFormat format = {0};
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GPU_vertformat_clear(&format);
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/* initialize vertex format */
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GPU_vertformat_attr_add(&format, "dummy", GPU_COMP_U8, 1, GPU_FETCH_INT_TO_FLOAT_UNIT);
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GPUVertBuf *vbo = GPU_vertbuf_create_with_format(&format);
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GPU_vertbuf_data_alloc(vbo, 1);
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GPUIndexBufBuilder elb;
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GPU_indexbuf_init_ex(&elb, prim_type, element_count, element_count);
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curves_batch_cache_fill_segments_indices(curves, verts_per_curve, elb);
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cache.final[subdiv].proc_hairs[thickness_res - 1] = GPU_batch_create_ex(
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prim_type, vbo, GPU_indexbuf_build(&elb), GPU_BATCH_OWNS_VBO | GPU_BATCH_OWNS_INDEX);
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}
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bool curves_ensure_procedural_data(Object *object,
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CurvesEvalCache **r_hair_cache,
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GPUMaterial *gpu_material,
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const int subdiv,
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const int thickness_res)
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{
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bool need_ft_update = false;
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Curves &curves = *static_cast<Curves *>(object->data);
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CurvesBatchCache &cache = curves_batch_cache_get(curves);
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*r_hair_cache = &cache.curves_cache;
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const int steps = 3; /* TODO: don't hard-code? */
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(*r_hair_cache)->final[subdiv].strands_res = 1 << (steps + subdiv);
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/* Refreshed on combing and simulation. */
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if ((*r_hair_cache)->proc_point_buf == nullptr) {
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ensure_seg_pt_count(curves, cache.curves_cache);
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curves_batch_cache_ensure_procedural_pos(curves, cache.curves_cache, gpu_material);
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need_ft_update = true;
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}
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/* Refreshed if active layer or custom data changes. */
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if ((*r_hair_cache)->strand_tex == nullptr) {
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curves_batch_cache_ensure_procedural_strand_data(curves, cache.curves_cache);
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}
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/* Refreshed only on subdiv count change. */
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if ((*r_hair_cache)->final[subdiv].proc_buf == nullptr) {
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curves_batch_cache_ensure_procedural_final_points(cache.curves_cache, subdiv);
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need_ft_update = true;
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}
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if ((*r_hair_cache)->final[subdiv].proc_hairs[thickness_res - 1] == nullptr) {
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curves_batch_cache_ensure_procedural_indices(
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curves, cache.curves_cache, thickness_res, subdiv);
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}
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return need_ft_update;
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}
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int DRW_curves_material_count_get(Curves *curves)
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{
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return max_ii(1, curves->totcol);
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}
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GPUBatch *DRW_curves_batch_cache_get_edit_points(Curves *curves)
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{
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CurvesBatchCache &cache = curves_batch_cache_get(*curves);
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return DRW_batch_request(&cache.edit_points);
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}
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void DRW_curves_batch_cache_create_requested(const Object *ob)
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{
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Curves *curves = static_cast<Curves *>(ob->data);
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CurvesBatchCache &cache = curves_batch_cache_get(*curves);
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if (DRW_batch_requested(cache.edit_points, GPU_PRIM_POINTS)) {
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DRW_vbo_request(cache.edit_points, &cache.curves_cache.proc_point_buf);
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}
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if (DRW_vbo_requested(cache.curves_cache.proc_point_buf)) {
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curves_batch_cache_ensure_procedural_pos(*curves, cache.curves_cache, nullptr);
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}
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}
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