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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) 2016 by Mike Erwin.
* All rights reserved.
*
* Contributor(s): Blender Foundation
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/gpu/gwn_element.h
* \ingroup gpu
*
* Gawain element list (AKA index buffer)
*/
#ifndef __GWN_ELEMENT_H__
#define __GWN_ELEMENT_H__
#include "GPU_primitive.h"
#define GWN_TRACK_INDEX_RANGE 1
#define GWN_PRIM_RESTART 0xFFFFFFFF
typedef enum {
GWN_INDEX_U8, /* GL has this, Vulkan does not */
GWN_INDEX_U16,
GWN_INDEX_U32
} Gwn_IndexBufType;
typedef struct Gwn_IndexBuf {
uint index_len;
#if GWN_TRACK_INDEX_RANGE
Gwn_IndexBufType index_type;
uint32_t gl_index_type;
uint min_index;
uint max_index;
uint base_index;
#endif
uint32_t vbo_id; /* 0 indicates not yet sent to VRAM */
bool use_prim_restart;
} Gwn_IndexBuf;
void GWN_indexbuf_use(Gwn_IndexBuf*);
uint GWN_indexbuf_size_get(const Gwn_IndexBuf*);
typedef struct Gwn_IndexBufBuilder {
uint max_allowed_index;
uint max_index_len;
uint index_len;
Gwn_PrimType prim_type;
uint* data;
bool use_prim_restart;
} Gwn_IndexBufBuilder;
/* supports all primitive types. */
void GWN_indexbuf_init_ex(Gwn_IndexBufBuilder*, Gwn_PrimType, uint index_len, uint vertex_len, bool use_prim_restart);
/* supports only GWN_PRIM_POINTS, GWN_PRIM_LINES and GWN_PRIM_TRIS. */
void GWN_indexbuf_init(Gwn_IndexBufBuilder*, Gwn_PrimType, uint prim_len, uint vertex_len);
void GWN_indexbuf_add_generic_vert(Gwn_IndexBufBuilder*, uint v);
void GWN_indexbuf_add_primitive_restart(Gwn_IndexBufBuilder*);
void GWN_indexbuf_add_point_vert(Gwn_IndexBufBuilder*, uint v);
void GWN_indexbuf_add_line_verts(Gwn_IndexBufBuilder*, uint v1, uint v2);
void GWN_indexbuf_add_tri_verts(Gwn_IndexBufBuilder*, uint v1, uint v2, uint v3);
void GWN_indexbuf_add_line_adj_verts(Gwn_IndexBufBuilder*, uint v1, uint v2, uint v3, uint v4);
Gwn_IndexBuf* GWN_indexbuf_build(Gwn_IndexBufBuilder*);
void GWN_indexbuf_build_in_place(Gwn_IndexBufBuilder*, Gwn_IndexBuf*);
void GWN_indexbuf_discard(Gwn_IndexBuf*);
/* Macros */
#define GWN_INDEXBUF_DISCARD_SAFE(elem) do { \
if (elem != NULL) { \
GWN_indexbuf_discard(elem); \
elem = NULL; \
} \
} while (0)
#endif /* __GWN_ELEMENT_H__ */
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