gpu_vertex_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) 2016 by Mike Erwin.
 * All rights reserved.
 */
 
#pragma once
 
#include "GPU_vertex_buffer.h"
 
namespace blender::gpu {
 
class VertBuf {
 public:
  static size_t memory_usage;
 
  GPUVertFormat format = {};
  uint vertex_len = 0;
  uint vertex_alloc = 0;
  GPUVertBufStatus flag = GPU_VERTBUF_INVALID;
  uchar *data = NULL;
 
 protected:
  GPUUsageType usage_ = GPU_USAGE_STATIC;
 
 private:
  int handle_refcount_ = 1;
 
 public:
  VertBuf();
  virtual ~VertBuf();
 
  void init(const GPUVertFormat *format, GPUUsageType usage);
  void clear(void);
 
  /* Data management. */
  void allocate(uint vert_len);
  void resize(uint vert_len);
  void upload(void);
 
  VertBuf *duplicate(void);
 
  /* Size of the data allocated. */
  size_t size_alloc_get(void) const
  {
    BLI_assert(format.packed);
    return vertex_alloc * format.stride;
  }
  /* Size of the data uploaded to the GPU. */
  size_t size_used_get(void) const
  {
    BLI_assert(format.packed);
    return vertex_len * format.stride;
  }
 
  void reference_add(void)
  {
    handle_refcount_++;
  }
  void reference_remove(void)
  {
    BLI_assert(handle_refcount_ > 0);
    handle_refcount_--;
    if (handle_refcount_ == 0) {
      delete this;
    }
  }
 
  virtual void update_sub(uint start, uint len, void *data) = 0;
 
 protected:
  virtual void acquire_data(void) = 0;
  virtual void resize_data(void) = 0;
  virtual void release_data(void) = 0;
  virtual void upload_data(void) = 0;
  virtual void duplicate_data(VertBuf *dst) = 0;
};
 
/* Syntactic sugar. */
static inline GPUVertBuf *wrap(VertBuf *vert)
{
  return reinterpret_cast<GPUVertBuf *>(vert);
}
static inline VertBuf *unwrap(GPUVertBuf *vert)
{
  return reinterpret_cast<VertBuf *>(vert);
}
static inline const VertBuf *unwrap(const GPUVertBuf *vert)
{
  return reinterpret_cast<const VertBuf *>(vert);
}
 
}  // namespace blender::gpu