diff options
Diffstat (limited to 'source/blender/draw/intern/draw_cache_impl_curves.cc')
| -rw-r--r-- | source/blender/draw/intern/draw_cache_impl_curves.cc | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/source/blender/draw/intern/draw_cache_impl_curves.cc b/source/blender/draw/intern/draw_cache_impl_curves.cc new file mode 100644 index 00000000000..8ec97495fcf --- /dev/null +++ b/source/blender/draw/intern/draw_cache_impl_curves.cc @@ -0,0 +1,389 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * The Original Code is Copyright (C) 2017 by Blender Foundation. + * All rights reserved. + */ + +/** \file + * \ingroup draw + * + * \brief Hair API for render engines + */ + +#include <cstring> + +#include "MEM_guardedalloc.h" + +#include "BLI_listbase.h" +#include "BLI_math_base.h" +#include "BLI_math_vec_types.hh" +#include "BLI_math_vector.h" +#include "BLI_math_vector.hh" +#include "BLI_span.hh" +#include "BLI_utildefines.h" + +#include "DNA_curves_types.h" +#include "DNA_object_types.h" + +#include "BKE_curves.h" + +#include "GPU_batch.h" +#include "GPU_material.h" +#include "GPU_texture.h" + +#include "draw_cache_impl.h" /* own include */ +#include "draw_hair_private.h" /* own include */ + +using blender::float3; +using blender::IndexRange; +using blender::Span; + +static void curves_batch_cache_clear(Curves *curves); + +/* ---------------------------------------------------------------------- */ +/* Hair GPUBatch Cache */ + +struct HairBatchCache { + ParticleHairCache hair; + + /* settings to determine if cache is invalid */ + bool is_dirty; +}; + +/* GPUBatch cache management. */ + +static bool curves_batch_cache_valid(Curves *curves) +{ + HairBatchCache *cache = static_cast<HairBatchCache *>(curves->batch_cache); + return (cache && cache->is_dirty == false); +} + +static void curves_batch_cache_init(Curves *curves) +{ + HairBatchCache *cache = static_cast<HairBatchCache *>(curves->batch_cache); + + if (!cache) { + cache = MEM_cnew<HairBatchCache>(__func__); + curves->batch_cache = cache; + } + else { + memset(cache, 0, sizeof(*cache)); + } + + cache->is_dirty = false; +} + +void DRW_curves_batch_cache_validate(Curves *curves) +{ + if (!curves_batch_cache_valid(curves)) { + curves_batch_cache_clear(curves); + curves_batch_cache_init(curves); + } +} + +static HairBatchCache *curves_batch_cache_get(Curves *curves) +{ + DRW_curves_batch_cache_validate(curves); + return static_cast<HairBatchCache *>(curves->batch_cache); +} + +void DRW_curves_batch_cache_dirty_tag(Curves *curves, int mode) +{ + HairBatchCache *cache = static_cast<HairBatchCache *>(curves->batch_cache); + if (cache == nullptr) { + return; + } + switch (mode) { + case BKE_CURVES_BATCH_DIRTY_ALL: + cache->is_dirty = true; + break; + default: + BLI_assert(0); + } +} + +static void curves_batch_cache_clear(Curves *curves) +{ + HairBatchCache *cache = static_cast<HairBatchCache *>(curves->batch_cache); + if (!cache) { + return; + } + + particle_batch_cache_clear_hair(&cache->hair); +} + +void DRW_curves_batch_cache_free(Curves *curves) +{ + curves_batch_cache_clear(curves); + MEM_SAFE_FREE(curves->batch_cache); +} + +static void ensure_seg_pt_count(Curves *curves, ParticleHairCache *curves_cache) +{ + if ((curves_cache->pos != nullptr && curves_cache->indices != nullptr) || + (curves_cache->proc_point_buf != nullptr)) { + return; + } + + curves_cache->strands_len = curves->geometry.curve_size; + curves_cache->elems_len = curves->geometry.point_size + curves->geometry.curve_size; + curves_cache->point_len = curves->geometry.point_size; +} + +static void curves_batch_cache_fill_segments_proc_pos(Curves *curves, + GPUVertBufRaw *attr_step, + GPUVertBufRaw *length_step) +{ + /* TODO: use hair radius layer if available. */ + const int curve_size = curves->geometry.curve_size; + Span<int> offsets{curves->geometry.offsets, curves->geometry.curve_size + 1}; + + Span<float3> positions{(float3 *)curves->geometry.position, curves->geometry.point_size}; + + for (const int i : IndexRange(curve_size)) { + const IndexRange curve_range(offsets[i], offsets[i + 1] - offsets[i]); + + Span<float3> spline_positions = positions.slice(curve_range); + float total_len = 0.0f; + float *seg_data_first; + for (const int i_spline : spline_positions.index_range()) { + float *seg_data = (float *)GPU_vertbuf_raw_step(attr_step); + copy_v3_v3(seg_data, spline_positions[i_spline]); + if (i_spline == 0) { + seg_data_first = seg_data; + } + else { + total_len += blender::math::distance(spline_positions[i_spline - 1], + spline_positions[i_spline]); + } + seg_data[3] = total_len; + } + /* Assign length value. */ + *(float *)GPU_vertbuf_raw_step(length_step) = total_len; + if (total_len > 0.0f) { + /* Divide by total length to have a [0-1] number. */ + for ([[maybe_unused]] const int i_spline : spline_positions.index_range()) { + seg_data_first[3] /= total_len; + seg_data_first += 4; + } + } + } +} + +static void curves_batch_cache_ensure_procedural_pos(Curves *curves, + ParticleHairCache *cache, + GPUMaterial *gpu_material) +{ + if (cache->proc_point_buf == nullptr) { + /* initialize vertex format */ + GPUVertFormat format = {0}; + uint pos_id = GPU_vertformat_attr_add(&format, "posTime", GPU_COMP_F32, 4, GPU_FETCH_FLOAT); + + cache->proc_point_buf = GPU_vertbuf_create_with_format(&format); + GPU_vertbuf_data_alloc(cache->proc_point_buf, cache->point_len); + + GPUVertBufRaw point_step; + GPU_vertbuf_attr_get_raw_data(cache->proc_point_buf, pos_id, &point_step); + + GPUVertFormat length_format = {0}; + uint length_id = GPU_vertformat_attr_add( + &length_format, "hairLength", GPU_COMP_F32, 1, GPU_FETCH_FLOAT); + + cache->proc_length_buf = GPU_vertbuf_create_with_format(&length_format); + GPU_vertbuf_data_alloc(cache->proc_length_buf, cache->strands_len); + + GPUVertBufRaw length_step; + GPU_vertbuf_attr_get_raw_data(cache->proc_length_buf, length_id, &length_step); + + curves_batch_cache_fill_segments_proc_pos(curves, &point_step, &length_step); + + /* Create vbo immediately to bind to texture buffer. */ + GPU_vertbuf_use(cache->proc_point_buf); + cache->point_tex = GPU_texture_create_from_vertbuf("hair_point", cache->proc_point_buf); + } + + if (gpu_material && cache->proc_length_buf != nullptr && cache->length_tex) { + ListBase gpu_attrs = GPU_material_attributes(gpu_material); + LISTBASE_FOREACH (GPUMaterialAttribute *, attr, &gpu_attrs) { + if (attr->type == CD_HAIRLENGTH) { + GPU_vertbuf_use(cache->proc_length_buf); + cache->length_tex = GPU_texture_create_from_vertbuf("hair_length", cache->proc_length_buf); + break; + } + } + } +} + +static void curves_batch_cache_fill_strands_data(Curves *curves, + GPUVertBufRaw *data_step, + GPUVertBufRaw *seg_step) +{ + const int curve_size = curves->geometry.curve_size; + Span<int> offsets{curves->geometry.offsets, curves->geometry.curve_size + 1}; + + for (const int i : IndexRange(curve_size)) { + const IndexRange curve_range(offsets[i], offsets[i + 1] - offsets[i]); + + *(uint *)GPU_vertbuf_raw_step(data_step) = curve_range.start(); + *(ushort *)GPU_vertbuf_raw_step(seg_step) = curve_range.size() - 1; + } +} + +static void curves_batch_cache_ensure_procedural_strand_data(Curves *curves, + ParticleHairCache *cache) +{ + GPUVertBufRaw data_step, seg_step; + + GPUVertFormat format_data = {0}; + uint data_id = GPU_vertformat_attr_add(&format_data, "data", GPU_COMP_U32, 1, GPU_FETCH_INT); + + GPUVertFormat format_seg = {0}; + uint seg_id = GPU_vertformat_attr_add(&format_seg, "data", GPU_COMP_U16, 1, GPU_FETCH_INT); + + /* Strand Data */ + cache->proc_strand_buf = GPU_vertbuf_create_with_format(&format_data); + GPU_vertbuf_data_alloc(cache->proc_strand_buf, cache->strands_len); + GPU_vertbuf_attr_get_raw_data(cache->proc_strand_buf, data_id, &data_step); + + cache->proc_strand_seg_buf = GPU_vertbuf_create_with_format(&format_seg); + GPU_vertbuf_data_alloc(cache->proc_strand_seg_buf, cache->strands_len); + GPU_vertbuf_attr_get_raw_data(cache->proc_strand_seg_buf, seg_id, &seg_step); + + curves_batch_cache_fill_strands_data(curves, &data_step, &seg_step); + + /* Create vbo immediately to bind to texture buffer. */ + GPU_vertbuf_use(cache->proc_strand_buf); + cache->strand_tex = GPU_texture_create_from_vertbuf("curves_strand", cache->proc_strand_buf); + + GPU_vertbuf_use(cache->proc_strand_seg_buf); + cache->strand_seg_tex = GPU_texture_create_from_vertbuf("curves_strand_seg", + cache->proc_strand_seg_buf); +} + +static void curves_batch_cache_ensure_procedural_final_points(ParticleHairCache *cache, int subdiv) +{ + /* Same format as point_tex. */ + GPUVertFormat format = {0}; + GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 4, GPU_FETCH_FLOAT); + + cache->final[subdiv].proc_buf = GPU_vertbuf_create_with_format_ex(&format, + GPU_USAGE_DEVICE_ONLY); + + /* Create a destination buffer for the transform feedback. Sized appropriately */ + /* Those are points! not line segments. */ + GPU_vertbuf_data_alloc(cache->final[subdiv].proc_buf, + cache->final[subdiv].strands_res * cache->strands_len); + + /* Create vbo immediately to bind to texture buffer. */ + GPU_vertbuf_use(cache->final[subdiv].proc_buf); + + cache->final[subdiv].proc_tex = GPU_texture_create_from_vertbuf("hair_proc", + cache->final[subdiv].proc_buf); +} + +static void curves_batch_cache_fill_segments_indices(Curves *curves, + const int res, + GPUIndexBufBuilder *elb) +{ + const int curve_size = curves->geometry.curve_size; + + uint curr_point = 0; + + for ([[maybe_unused]] const int i : IndexRange(curve_size)) { + for (int k = 0; k < res; k++) { + GPU_indexbuf_add_generic_vert(elb, curr_point++); + } + GPU_indexbuf_add_primitive_restart(elb); + } +} + +static void curves_batch_cache_ensure_procedural_indices(Curves *curves, + ParticleHairCache *cache, + int thickness_res, + int subdiv) +{ + BLI_assert(thickness_res <= MAX_THICKRES); /* Cylinder strip not currently supported. */ + + if (cache->final[subdiv].proc_hairs[thickness_res - 1] != nullptr) { + return; + } + + int verts_per_hair = cache->final[subdiv].strands_res * thickness_res; + /* +1 for primitive restart */ + int element_count = (verts_per_hair + 1) * cache->strands_len; + GPUPrimType prim_type = (thickness_res == 1) ? GPU_PRIM_LINE_STRIP : GPU_PRIM_TRI_STRIP; + + static GPUVertFormat format = {0}; + GPU_vertformat_clear(&format); + + /* initialize vertex format */ + GPU_vertformat_attr_add(&format, "dummy", GPU_COMP_U8, 1, GPU_FETCH_INT_TO_FLOAT_UNIT); + + GPUVertBuf *vbo = GPU_vertbuf_create_with_format(&format); + GPU_vertbuf_data_alloc(vbo, 1); + + GPUIndexBufBuilder elb; + GPU_indexbuf_init_ex(&elb, prim_type, element_count, element_count); + + curves_batch_cache_fill_segments_indices(curves, verts_per_hair, &elb); + + cache->final[subdiv].proc_hairs[thickness_res - 1] = GPU_batch_create_ex( + prim_type, vbo, GPU_indexbuf_build(&elb), GPU_BATCH_OWNS_VBO | GPU_BATCH_OWNS_INDEX); +} + +bool hair_ensure_procedural_data(Object *object, + ParticleHairCache **r_hair_cache, + GPUMaterial *gpu_material, + int subdiv, + int thickness_res) +{ + bool need_ft_update = false; + Curves *curves = static_cast<Curves *>(object->data); + + HairBatchCache *cache = curves_batch_cache_get(curves); + *r_hair_cache = &cache->hair; + + const int steps = 2; /* TODO: don't hard-code? */ + (*r_hair_cache)->final[subdiv].strands_res = 1 << (steps + subdiv); + + /* Refreshed on combing and simulation. */ + if ((*r_hair_cache)->proc_point_buf == nullptr) { + ensure_seg_pt_count(curves, &cache->hair); + curves_batch_cache_ensure_procedural_pos(curves, &cache->hair, gpu_material); + need_ft_update = true; + } + + /* Refreshed if active layer or custom data changes. */ + if ((*r_hair_cache)->strand_tex == nullptr) { + curves_batch_cache_ensure_procedural_strand_data(curves, &cache->hair); + } + + /* Refreshed only on subdiv count change. */ + if ((*r_hair_cache)->final[subdiv].proc_buf == nullptr) { + curves_batch_cache_ensure_procedural_final_points(&cache->hair, subdiv); + need_ft_update = true; + } + if ((*r_hair_cache)->final[subdiv].proc_hairs[thickness_res - 1] == nullptr) { + curves_batch_cache_ensure_procedural_indices(curves, &cache->hair, thickness_res, subdiv); + } + + return need_ft_update; +} + +int DRW_curves_material_count_get(Curves *curves) +{ + return max_ii(1, curves->totcol); +} |