150 lines
4.3 KiB
C++
150 lines
4.3 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 vertex buffer
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*/
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#ifndef __GPU_VERTEX_BUFFER_H__
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#define __GPU_VERTEX_BUFFER_H__
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#include "GPU_vertex_format.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define VRAM_USAGE 1
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/**
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* How to create a #GPUVertBuf:
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* 1) verts = GPU_vertbuf_create() or GPU_vertbuf_init(verts)
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* 2) GPU_vertformat_attr_add(verts->format, ...)
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* 3) GPU_vertbuf_data_alloc(verts, vertex_len) <-- finalizes/packs vertex format
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* 4) GPU_vertbuf_attr_fill(verts, pos, application_pos_buffer)
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*/
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/* Is GPUVertBuf always used as part of a GPUBatch? */
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typedef enum {
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/* can be extended to support more types */
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GPU_USAGE_STREAM,
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GPU_USAGE_STATIC, /* do not keep data in memory */
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GPU_USAGE_DYNAMIC,
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} GPUUsageType;
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typedef struct GPUVertBuf {
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GPUVertFormat format;
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/** Number of verts we want to draw. */
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uint vertex_len;
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/** Number of verts data. */
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uint vertex_alloc;
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/** 0 indicates not yet allocated. */
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uint32_t vbo_id;
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/** Usage hint for GL optimisation. */
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uint usage : 2;
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/** Data has been touched and need to be reuploaded to GPU. */
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uint dirty : 1;
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unsigned char *data; /* NULL indicates data in VRAM (unmapped) */
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} GPUVertBuf;
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GPUVertBuf *GPU_vertbuf_create(GPUUsageType);
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GPUVertBuf *GPU_vertbuf_create_with_format_ex(const GPUVertFormat *, GPUUsageType);
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#define GPU_vertbuf_create_with_format(format) \
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GPU_vertbuf_create_with_format_ex(format, GPU_USAGE_STATIC)
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void GPU_vertbuf_clear(GPUVertBuf *verts);
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void GPU_vertbuf_discard(GPUVertBuf *);
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void GPU_vertbuf_init(GPUVertBuf *, GPUUsageType);
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void GPU_vertbuf_init_with_format_ex(GPUVertBuf *, const GPUVertFormat *, GPUUsageType);
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#define GPU_vertbuf_init_with_format(verts, format) \
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GPU_vertbuf_init_with_format_ex(verts, format, GPU_USAGE_STATIC)
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uint GPU_vertbuf_size_get(const GPUVertBuf *);
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void GPU_vertbuf_data_alloc(GPUVertBuf *, uint v_len);
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void GPU_vertbuf_data_resize(GPUVertBuf *, uint v_len);
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void GPU_vertbuf_data_len_set(GPUVertBuf *, uint v_len);
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/* The most important #set_attr variant is the untyped one. Get it right first.
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* It takes a void* so the app developer is responsible for matching their app data types
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* to the vertex attribute's type and component count. They're in control of both, so this
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* should not be a problem. */
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void GPU_vertbuf_attr_set(GPUVertBuf *, uint a_idx, uint v_idx, const void *data);
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void GPU_vertbuf_vert_set(GPUVertBuf *verts, uint v_idx, const void *data);
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/* Tightly packed, non interleaved input data. */
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void GPU_vertbuf_attr_fill(GPUVertBuf *, uint a_idx, const void *data);
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void GPU_vertbuf_attr_fill_stride(GPUVertBuf *, uint a_idx, uint stride, const void *data);
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/* For low level access only */
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typedef struct GPUVertBufRaw {
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uint size;
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uint stride;
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unsigned char *data;
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unsigned char *data_init;
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#if TRUST_NO_ONE
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/* Only for overflow check */
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unsigned char *_data_end;
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#endif
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} GPUVertBufRaw;
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GPU_INLINE void *GPU_vertbuf_raw_step(GPUVertBufRaw *a)
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{
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unsigned char *data = a->data;
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a->data += a->stride;
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#if TRUST_NO_ONE
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assert(data < a->_data_end);
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#endif
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return (void *)data;
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}
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GPU_INLINE uint GPU_vertbuf_raw_used(GPUVertBufRaw *a)
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{
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return ((a->data - a->data_init) / a->stride);
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}
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void GPU_vertbuf_attr_get_raw_data(GPUVertBuf *, uint a_idx, GPUVertBufRaw *access);
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void GPU_vertbuf_use(GPUVertBuf *);
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/* Metrics */
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uint GPU_vertbuf_get_memory_usage(void);
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/* Macros */
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#define GPU_VERTBUF_DISCARD_SAFE(verts) \
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do { \
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if (verts != NULL) { \
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GPU_vertbuf_discard(verts); \
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verts = 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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#endif /* __GPU_VERTEX_BUFFER_H__ */
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