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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. All rights reserved. */
/** \file
* \ingroup draw
*/
#include "MEM_guardedalloc.h"
#include "BKE_mesh.h"
#include "extract_mesh.hh"
#include "draw_subdivision.h"
namespace blender::draw {
/* ---------------------------------------------------------------------- */
/** \name Extract Edit UV area stretch
* \{ */
static void extract_edituv_stretch_area_init(const MeshRenderData *mr,
MeshBatchCache * /*cache*/,
void *buf,
void * /*tls_data*/)
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "ratio", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
}
GPU_vertbuf_init_with_format(vbo, &format);
GPU_vertbuf_data_alloc(vbo, mr->loop_len);
}
BLI_INLINE float area_ratio_get(float area, float uvarea)
{
if (area >= FLT_EPSILON && uvarea >= FLT_EPSILON) {
return uvarea / area;
}
return 0.0f;
}
BLI_INLINE float area_ratio_to_stretch(float ratio, float tot_ratio)
{
ratio *= tot_ratio;
return (ratio > 1.0f) ? (1.0f / ratio) : ratio;
}
static void compute_area_ratio(const MeshRenderData *mr,
float *r_area_ratio,
float &r_tot_area,
float &r_tot_uv_area)
{
float tot_area = 0.0f, tot_uv_area = 0.0f;
if (mr->extract_type == MR_EXTRACT_BMESH) {
CustomData *cd_ldata = &mr->bm->ldata;
int uv_ofs = CustomData_get_offset(cd_ldata, CD_MLOOPUV);
BMFace *efa;
BMIter f_iter;
int f;
BM_ITER_MESH_INDEX (efa, &f_iter, mr->bm, BM_FACES_OF_MESH, f) {
float area = BM_face_calc_area(efa);
float uvarea = BM_face_calc_area_uv(efa, uv_ofs);
tot_area += area;
tot_uv_area += uvarea;
r_area_ratio[f] = area_ratio_get(area, uvarea);
}
}
else {
BLI_assert(mr->extract_type == MR_EXTRACT_MESH);
const MLoopUV *uv_data = (const MLoopUV *)CustomData_get_layer(&mr->me->ldata, CD_MLOOPUV);
const MPoly *mp = mr->mpoly;
for (int mp_index = 0; mp_index < mr->poly_len; mp_index++, mp++) {
float area = BKE_mesh_calc_poly_area(
mp, &mr->mloop[mp->loopstart], reinterpret_cast<const float(*)[3]>(mr->positions));
float uvarea = BKE_mesh_calc_poly_uv_area(mp, uv_data);
tot_area += area;
tot_uv_area += uvarea;
r_area_ratio[mp_index] = area_ratio_get(area, uvarea);
}
}
r_tot_area = tot_area;
r_tot_uv_area = tot_uv_area;
}
static void extract_edituv_stretch_area_finish(const MeshRenderData *mr,
MeshBatchCache *cache,
void *buf,
void * /*data*/)
{
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buf);
float *area_ratio = static_cast<float *>(MEM_mallocN(sizeof(float) * mr->poly_len, __func__));
compute_area_ratio(mr, area_ratio, cache->tot_area, cache->tot_uv_area);
/* Copy face data for each loop. */
float *loop_stretch = (float *)GPU_vertbuf_get_data(vbo);
if (mr->extract_type == MR_EXTRACT_BMESH) {
BMFace *efa;
BMIter f_iter;
int f, l_index = 0;
BM_ITER_MESH_INDEX (efa, &f_iter, mr->bm, BM_FACES_OF_MESH, f) {
for (int i = 0; i < efa->len; i++, l_index++) {
loop_stretch[l_index] = area_ratio[f];
}
}
}
else {
BLI_assert(mr->extract_type == MR_EXTRACT_MESH);
const MPoly *mp = mr->mpoly;
for (int mp_index = 0, l_index = 0; mp_index < mr->poly_len; mp_index++, mp++) {
for (int i = 0; i < mp->totloop; i++, l_index++) {
loop_stretch[l_index] = area_ratio[mp_index];
}
}
}
MEM_freeN(area_ratio);
}
static void extract_edituv_stretch_area_init_subdiv(const DRWSubdivCache *subdiv_cache,
const MeshRenderData *mr,
MeshBatchCache *cache,
void *buffer,
void * /*data*/)
{
/* Initialize final buffer. */
GPUVertBuf *vbo = static_cast<GPUVertBuf *>(buffer);
static GPUVertFormat format = {0};
if (format.attr_len == 0) {
GPU_vertformat_attr_add(&format, "ratio", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
}
GPU_vertbuf_init_build_on_device(vbo, &format, subdiv_cache->num_subdiv_loops);
/* Initialize coarse data buffer. */
GPUVertBuf *coarse_data = GPU_vertbuf_calloc();
/* We use the same format as we just copy data around. */
GPU_vertbuf_init_with_format(coarse_data, &format);
GPU_vertbuf_data_alloc(coarse_data, mr->loop_len);
compute_area_ratio(mr,
static_cast<float *>(GPU_vertbuf_get_data(coarse_data)),
cache->tot_area,
cache->tot_uv_area);
draw_subdiv_build_edituv_stretch_area_buffer(subdiv_cache, coarse_data, vbo);
GPU_vertbuf_discard(coarse_data);
}
constexpr MeshExtract create_extractor_edituv_stretch_area()
{
MeshExtract extractor = {nullptr};
extractor.init = extract_edituv_stretch_area_init;
extractor.finish = extract_edituv_stretch_area_finish;
extractor.init_subdiv = extract_edituv_stretch_area_init_subdiv;
extractor.data_type = MR_DATA_NONE;
extractor.data_size = 0;
extractor.use_threading = false;
extractor.mesh_buffer_offset = offsetof(MeshBufferList, vbo.edituv_stretch_area);
return extractor;
}
/** \} */
} // namespace blender::draw
const MeshExtract extract_edituv_stretch_area =
blender::draw::create_extractor_edituv_stretch_area();
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