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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file draw_cache_impl_displist.c
* \ingroup draw
*
* \brief DispList API for render engines
*
* \note DispList may be removed soon! This is a utility for object types that use render.
*/
#include "MEM_guardedalloc.h"
#include "BLI_utildefines.h"
#include "BLI_math_vector.h"
#include "DNA_curve_types.h"
#include "BKE_displist.h"
#include "GPU_batch.h"
#include "draw_cache_impl.h" /* own include */
static int dl_vert_len(const DispList *dl)
{
switch (dl->type) {
case DL_INDEX3:
case DL_INDEX4:
return dl->nr;
case DL_SURF:
return dl->parts * dl->nr;
}
return 0;
}
static int dl_tri_len(const DispList *dl)
{
switch (dl->type) {
case DL_INDEX3:
return dl->parts;
case DL_INDEX4:
return dl->parts * 2;
case DL_SURF:
return dl->totindex * 2;
}
return 0;
}
/* see: displist_get_allverts */
static int curve_render_surface_vert_len_get(const ListBase *lb)
{
int vert_len = 0;
for (const DispList *dl = lb->first; dl; dl = dl->next) {
vert_len += dl_vert_len(dl);
}
return vert_len;
}
static int curve_render_surface_tri_len_get(const ListBase *lb)
{
int tri_len = 0;
for (const DispList *dl = lb->first; dl; dl = dl->next) {
tri_len += dl_tri_len(dl);
}
return tri_len;
}
Batch *BLI_displist_batch_calc_surface(ListBase *lb)
{
const int tri_len = curve_render_surface_tri_len_get(lb);
if (tri_len == 0) {
return NULL;
}
static VertexFormat format = { 0 };
static unsigned int pos_id, nor_id;
if (format.attrib_ct == 0) {
/* initialize vertex format */
pos_id = VertexFormat_add_attrib(&format, "pos", COMP_F32, 3, KEEP_FLOAT);
nor_id = VertexFormat_add_attrib(&format, "nor", COMP_F32, 3, KEEP_FLOAT);
}
const int vert_len = curve_render_surface_vert_len_get(lb);
VertexBuffer *vbo = VertexBuffer_create_with_format(&format);
{
const int vbo_len_capacity = vert_len;
int vbo_len_used = 0;
VertexBuffer_allocate_data(vbo, vbo_len_capacity);
BKE_displist_normals_add(lb);
for (const DispList *dl = lb->first; dl; dl = dl->next) {
const bool ndata_is_single = dl->type == DL_INDEX3;
if (ELEM(dl->type, DL_INDEX3, DL_INDEX4, DL_SURF)) {
const float *fp_co = dl->verts;
const float *fp_no = dl->nors;
const int vbo_end = vbo_len_used + dl_vert_len(dl);
while (vbo_len_used < vbo_end) {
VertexBuffer_set_attrib(vbo, pos_id, vbo_len_used, fp_co);
if (fp_no) {
VertexBuffer_set_attrib(vbo, nor_id, vbo_len_used, fp_no);
if (ndata_is_single == false) {
fp_no += 3;
}
}
fp_co += 3;
vbo_len_used += 1;
}
}
}
}
{
ElementListBuilder elb;
ElementListBuilder_init(&elb, PRIM_TRIANGLES, tri_len, vert_len);
int ofs = 0;
int tri_len_used = 0;
for (const DispList *dl = lb->first; dl; dl = dl->next) {
if (ELEM(dl->type, DL_INDEX3, DL_INDEX4, DL_SURF)) {
if (dl->type == DL_INDEX3) {
const int *idx = dl->index;
const int i_end = dl->parts;
for (int i = 0; i < i_end; i++) {
add_triangle_vertices(&elb, idx[0] + ofs, idx[1] + ofs, idx[2] + ofs);
tri_len_used += 1;
idx += 3;
}
}
else if (ELEM(dl->type, DL_INDEX4, DL_SURF)) {
const int *idx = dl->index;
const int i_end = dl->totindex;
for (int i = 0; i < i_end; i++) {
add_triangle_vertices(&elb, idx[0] + ofs, idx[1] + ofs, idx[2] + ofs);
tri_len_used += 1;
add_triangle_vertices(&elb, idx[0] + ofs, idx[2] + ofs, idx[3] + ofs);
tri_len_used += 1;
idx += 4;
}
}
ofs += dl_vert_len(dl);
}
}
return Batch_create(PRIM_TRIANGLES, vbo, ElementList_build(&elb));
}
}
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