gl_vertex_buffer.hh

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/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "MEM_guardedalloc.h"
 
#include "GPU_texture.hh"
 
#include "GPU_vertex_buffer.hh"
 
namespace blender {
namespace gpu {
 
class GLVertBuf : public VertBuf {
  friend class GLTexture;    /* For buffer texture. */
  friend class GLShader;     /* For transform feedback. */
  friend class GLStorageBuf; /* For sub copy. */
 
 private:
  GLuint vbo_id_ = 0;
  ::GPUTexture *buffer_texture_ = nullptr;
  bool is_wrapper_ = false;
  size_t vbo_size_ = 0;
 
 public:
  void bind();
 
  void update_sub(uint start, uint len, const void *data) override;
 
  void read(void *data) const override;
 
  void wrap_handle(uint64_t handle) override;
 
 protected:
  void acquire_data() override;
  void resize_data() override;
  void release_data() override;
  void upload_data() override;
  void duplicate_data(VertBuf *dst) override;
  void bind_as_ssbo(uint binding) override;
  void bind_as_texture(uint binding) override;
 
 private:
  bool is_active() const;
 
  MEM_CXX_CLASS_ALLOC_FUNCS("GLVertBuf");
};
 
static inline GLenum to_gl(GPUUsageType type)
{
  switch (type) {
    case GPU_USAGE_STREAM:
      return GL_STREAM_DRAW;
    case GPU_USAGE_DYNAMIC:
      return GL_DYNAMIC_DRAW;
    case GPU_USAGE_STATIC:
    case GPU_USAGE_DEVICE_ONLY:
      return GL_STATIC_DRAW;
    default:
      BLI_assert(0);
      return GL_STATIC_DRAW;
  }
}
 
static inline GLenum to_gl(GPUVertCompType type)
{
  switch (type) {
    case GPU_COMP_I8:
      return GL_BYTE;
    case GPU_COMP_U8:
      return GL_UNSIGNED_BYTE;
    case GPU_COMP_I16:
      return GL_SHORT;
    case GPU_COMP_U16:
      return GL_UNSIGNED_SHORT;
    case GPU_COMP_I32:
      return GL_INT;
    case GPU_COMP_U32:
      return GL_UNSIGNED_INT;
    case GPU_COMP_F32:
      return GL_FLOAT;
    case GPU_COMP_I10:
      return GL_INT_2_10_10_10_REV;
    default:
      BLI_assert(0);
      return GL_FLOAT;
  }
}
 
}  // namespace gpu
}  // namespace blender