120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2016 by Mike Erwin.
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* All rights reserved.
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*/
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/** \file
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* \ingroup gpu
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*
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* GPU element list (AKA index buffer)
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*/
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#pragma once
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#include "GPU_primitive.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define GPU_TRACK_INDEX_RANGE 1
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typedef enum {
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GPU_INDEX_U16,
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GPU_INDEX_U32,
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} GPUIndexBufType;
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typedef struct GPUIndexBuf {
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uint index_start;
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uint index_len;
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bool is_subrange;
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#if GPU_TRACK_INDEX_RANGE
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GPUIndexBufType index_type;
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uint32_t gl_index_type;
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uint base_index;
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#endif
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uint32_t ibo_id; /* 0 indicates not yet sent to VRAM */
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union {
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void *data; /* non-NULL indicates not yet sent to VRAM */
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struct GPUIndexBuf *src; /* if is_subrange is true, this is the source buffer. */
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};
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} GPUIndexBuf;
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GPUIndexBuf *GPU_indexbuf_calloc(void);
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void GPU_indexbuf_use(GPUIndexBuf *);
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uint GPU_indexbuf_size_get(const GPUIndexBuf *);
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typedef struct GPUIndexBufBuilder {
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uint max_allowed_index;
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uint max_index_len;
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uint index_len;
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GPUPrimType prim_type;
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uint *data;
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} GPUIndexBufBuilder;
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/* supports all primitive types. */
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void GPU_indexbuf_init_ex(GPUIndexBufBuilder *, GPUPrimType, uint index_len, uint vertex_len);
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/* supports only GPU_PRIM_POINTS, GPU_PRIM_LINES and GPU_PRIM_TRIS. */
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void GPU_indexbuf_init(GPUIndexBufBuilder *, GPUPrimType, uint prim_len, uint vertex_len);
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void GPU_indexbuf_add_generic_vert(GPUIndexBufBuilder *, uint v);
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void GPU_indexbuf_add_primitive_restart(GPUIndexBufBuilder *);
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void GPU_indexbuf_add_point_vert(GPUIndexBufBuilder *, uint v);
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void GPU_indexbuf_add_line_verts(GPUIndexBufBuilder *, uint v1, uint v2);
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void GPU_indexbuf_add_tri_verts(GPUIndexBufBuilder *, uint v1, uint v2, uint v3);
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void GPU_indexbuf_add_line_adj_verts(GPUIndexBufBuilder *, uint v1, uint v2, uint v3, uint v4);
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void GPU_indexbuf_set_point_vert(GPUIndexBufBuilder *builder, uint elem, uint v1);
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void GPU_indexbuf_set_line_verts(GPUIndexBufBuilder *builder, uint elem, uint v1, uint v2);
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void GPU_indexbuf_set_tri_verts(GPUIndexBufBuilder *builder, uint elem, uint v1, uint v2, uint v3);
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/* Skip primitive rendering at the given index. */
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void GPU_indexbuf_set_point_restart(GPUIndexBufBuilder *builder, uint elem);
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void GPU_indexbuf_set_line_restart(GPUIndexBufBuilder *builder, uint elem);
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void GPU_indexbuf_set_tri_restart(GPUIndexBufBuilder *builder, uint elem);
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GPUIndexBuf *GPU_indexbuf_build(GPUIndexBufBuilder *);
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void GPU_indexbuf_build_in_place(GPUIndexBufBuilder *, GPUIndexBuf *);
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/* Create a subrange of an existing indexbuffer. */
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GPUIndexBuf *GPU_indexbuf_create_subrange(GPUIndexBuf *ibo, uint start, uint length);
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void GPU_indexbuf_create_subrange_in_place(GPUIndexBuf *r_ibo,
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GPUIndexBuf *ibo,
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uint start,
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uint length);
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void GPU_indexbuf_discard(GPUIndexBuf *);
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int GPU_indexbuf_primitive_len(GPUPrimType prim_type);
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/* Macros */
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#define GPU_INDEXBUF_DISCARD_SAFE(elem) \
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do { \
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if (elem != NULL) { \
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GPU_indexbuf_discard(elem); \
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elem = NULL; \
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} \
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} while (0)
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#ifdef __cplusplus
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}
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#endif
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