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/*
* 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) 2020 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup gpu
*/
#pragma once
#include "BLI_assert.h"
#include "GPU_index_buffer.h"
#define GPU_TRACK_INDEX_RANGE 1
namespace blender::gpu {
typedef enum {
GPU_INDEX_U16,
GPU_INDEX_U32,
} GPUIndexBufType;
static inline size_t to_bytesize(GPUIndexBufType type)
{
return (type == GPU_INDEX_U32) ? sizeof(uint32_t) : sizeof(uint16_t);
}
/**
* Base class which is then specialized for each implementation (GL, VK, ...).
*
* \note #IndexBuf does not hold any #GPUPrimType.
* This is because it can be interpreted differently by multiple batches.
*/
class IndexBuf {
protected:
/** Type of indices used inside this buffer. */
GPUIndexBufType index_type_ = GPU_INDEX_U32;
/** Offset in this buffer to the first index to render. Is 0 if not a subrange. */
uint32_t index_start_ = 0;
/** Number of indices to render. */
uint32_t index_len_ = 0;
/** Base index: Added to all indices after fetching. Allows index compression. */
uint32_t index_base_ = 0;
/** Bookkeeping. */
bool is_init_ = false;
/** Is this object only a reference to a subrange of another IndexBuf. */
bool is_subrange_ = false;
union {
/** Mapped buffer data. non-NULL indicates not yet sent to VRAM. */
void *data_ = nullptr;
/** If is_subrange is true, this is the source index buffer. */
IndexBuf *src_;
};
public:
IndexBuf(){};
virtual ~IndexBuf();
void init(uint indices_len, uint32_t *indices);
void init_subrange(IndexBuf *elem_src, uint start, uint length);
uint32_t index_len_get(void) const
{
return index_len_;
}
/* Return size in byte of the drawable data buffer range. Actual buffer size might be bigger. */
size_t size_get(void)
{
return index_len_ * to_bytesize(index_type_);
};
bool is_init(void) const
{
return is_init_;
};
private:
inline void squeeze_indices_short(uint min_idx, uint max_idx);
inline uint index_range(uint *r_min, uint *r_max);
};
/* Syntactic sugar. */
static inline GPUIndexBuf *wrap(IndexBuf *indexbuf)
{
return reinterpret_cast<GPUIndexBuf *>(indexbuf);
}
static inline IndexBuf *unwrap(GPUIndexBuf *indexbuf)
{
return reinterpret_cast<IndexBuf *>(indexbuf);
}
static inline int indices_per_primitive(GPUPrimType prim_type)
{
switch (prim_type) {
case GPU_PRIM_POINTS:
return 1;
case GPU_PRIM_LINES:
return 2;
case GPU_PRIM_TRIS:
return 3;
case GPU_PRIM_LINES_ADJ:
return 4;
default:
return -1;
}
}
} // namespace blender::gpu
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