gpu_index_buffer_private.hh

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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.
 */
 
#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);
}
 
class IndexBuf {
 protected:
  GPUIndexBufType index_type_ = GPU_INDEX_U32;
  uint32_t index_start_ = 0;
  uint32_t index_len_ = 0;
  uint32_t index_base_ = 0;
  bool is_init_ = false;
  bool is_subrange_ = false;
 
  union {
    void *data_ = nullptr;
    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