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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2001-2002 NaN Holding BV. All rights reserved. */
/** \file
* \ingroup spview3d
*/
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "BLI_math_vector.h"
#include "BKE_DerivedMesh.h"
#include "BKE_customdata.h"
#include "BKE_editmesh.h"
#include "BKE_global.h"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_object.h"
#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"
#include "GPU_batch.h"
#include "GPU_immediate.h"
#include "GPU_shader.h"
#include "GPU_state.h"
#include "ED_mesh.h"
#include "UI_resources.h"
#include "DRW_engine.h"
#include "view3d_intern.h" /* bad level include */
#ifdef VIEW3D_CAMERA_BORDER_HACK
uchar view3d_camera_border_hack_col[3];
bool view3d_camera_border_hack_test = false;
#endif
/* ***************** BACKBUF SEL (BBS) ********* */
void ED_draw_object_facemap(Depsgraph *depsgraph,
Object *ob,
const float col[4],
const int facemap)
{
/* happens on undo */
if (ob->type != OB_MESH || !ob->data) {
return;
}
const Mesh *me = ob->data;
{
Object *ob_eval = DEG_get_evaluated_object(depsgraph, ob);
const Mesh *me_eval = BKE_object_get_evaluated_mesh(ob_eval);
if (me_eval != NULL) {
me = me_eval;
}
}
GPU_front_facing(ob->transflag & OB_NEG_SCALE);
/* Just to create the data to pass to immediate mode! (sigh) */
const int *facemap_data = CustomData_get_layer(&me->pdata, CD_FACEMAP);
if (facemap_data) {
GPU_blend(GPU_BLEND_ALPHA);
const MVert *verts = BKE_mesh_verts(me);
const MPoly *polys = BKE_mesh_polys(me);
const MLoop *loops = BKE_mesh_loops(me);
int mpoly_len = me->totpoly;
int mloop_len = me->totloop;
facemap_data = CustomData_get_layer(&me->pdata, CD_FACEMAP);
/* Make a batch and free it each time for now. */
const int looptris_len = poly_to_tri_count(mpoly_len, mloop_len);
const int vbo_len_capacity = looptris_len * 3;
int vbo_len_used = 0;
GPUVertFormat format_pos = {0};
const uint pos_id = GPU_vertformat_attr_add(
&format_pos, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
GPUVertBuf *vbo_pos = GPU_vertbuf_create_with_format(&format_pos);
GPU_vertbuf_data_alloc(vbo_pos, vbo_len_capacity);
GPUVertBufRaw pos_step;
GPU_vertbuf_attr_get_raw_data(vbo_pos, pos_id, &pos_step);
const MPoly *mp;
int i;
if (BKE_mesh_runtime_looptri_ensure(me)) {
const MLoopTri *mlt = BKE_mesh_runtime_looptri_ensure(me);
for (mp = polys, i = 0; i < mpoly_len; i++, mp++) {
if (facemap_data[i] == facemap) {
for (int j = 2; j < mp->totloop; j++) {
copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[loops[mlt->tri[0]].v].co);
copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[loops[mlt->tri[1]].v].co);
copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[loops[mlt->tri[2]].v].co);
vbo_len_used += 3;
mlt++;
}
}
else {
mlt += mp->totloop - 2;
}
}
}
else {
/* No tessellation data, fan-fill. */
for (mp = polys, i = 0; i < mpoly_len; i++, mp++) {
if (facemap_data[i] == facemap) {
const MLoop *ml_start = &loops[mp->loopstart];
const MLoop *ml_a = ml_start + 1;
const MLoop *ml_b = ml_start + 2;
for (int j = 2; j < mp->totloop; j++) {
copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[ml_start->v].co);
copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[ml_a->v].co);
copy_v3_v3(GPU_vertbuf_raw_step(&pos_step), verts[ml_b->v].co);
vbo_len_used += 3;
ml_a++;
ml_b++;
}
}
}
}
if (vbo_len_capacity != vbo_len_used) {
GPU_vertbuf_data_resize(vbo_pos, vbo_len_used);
}
GPUBatch *draw_batch = GPU_batch_create(GPU_PRIM_TRIS, vbo_pos, NULL);
GPU_batch_program_set_builtin(draw_batch, GPU_SHADER_3D_UNIFORM_COLOR);
GPU_batch_uniform_4fv(draw_batch, "color", col);
GPU_batch_draw(draw_batch);
GPU_batch_discard(draw_batch);
GPU_vertbuf_discard(vbo_pos);
GPU_blend(GPU_BLEND_NONE);
}
}
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