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// Gawain element list (AKA index buffer)
//
// This code is part of the Gawain library, with modifications
// specific to integration with Blender.
//
// Copyright 2016 Mike Erwin
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
#pragma once
#include "gwn_primitive.h"
#define GWN_TRACK_INDEX_RANGE 1
typedef enum {
GWN_INDEX_U8, // GL has this, Vulkan does not
GWN_INDEX_U16,
GWN_INDEX_U32
} Gwn_IndexBufType;
typedef struct Gwn_IndexBuf {
unsigned index_ct;
#if GWN_TRACK_INDEX_RANGE
Gwn_IndexBufType index_type;
GLenum gl_index_type;
unsigned min_index;
unsigned max_index;
unsigned base_index;
#endif
void* data; // NULL indicates data in VRAM (unmapped) or not yet allocated
GLuint vbo_id; // 0 indicates not yet sent to VRAM
} Gwn_IndexBuf;
void GWN_indexbuf_use(Gwn_IndexBuf*);
unsigned GWN_indexbuf_size_get(const Gwn_IndexBuf*);
typedef struct Gwn_IndexBufBuilder {
unsigned max_allowed_index;
unsigned max_index_ct;
unsigned index_ct;
Gwn_PrimType prim_type;
unsigned* data;
} Gwn_IndexBufBuilder;
// supported primitives:
// GWN_PRIM_POINTS
// GWN_PRIM_LINES
// GWN_PRIM_TRIS
void GWN_indexbuf_init(Gwn_IndexBufBuilder*, Gwn_PrimType, unsigned prim_ct, unsigned vertex_ct);
//void GWN_indexbuf_init_custom(Gwn_IndexBufBuilder*, Gwn_PrimType, unsigned index_ct, unsigned vertex_ct);
void GWN_indexbuf_add_generic_vert(Gwn_IndexBufBuilder*, unsigned v);
void GWN_indexbuf_add_point_vert(Gwn_IndexBufBuilder*, unsigned v);
void GWN_indexbuf_add_line_verts(Gwn_IndexBufBuilder*, unsigned v1, unsigned v2);
void GWN_indexbuf_add_tri_verts(Gwn_IndexBufBuilder*, unsigned v1, unsigned v2, unsigned v3);
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)
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