/* SPDX-FileCopyrightText: 2022 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup gpu
 */

#include "vk_uniform_buffer.hh"
#include "vk_context.hh"
#include "vk_shader.hh"
#include "vk_shader_interface.hh"
#include "vk_staging_buffer.hh"
#include "vk_state_manager.hh"

namespace blender::gpu {

void VKUniformBuffer::update(const void *data)
{
  if (!buffer_.is_allocated()) {
    allocate();
  }

  /* TODO: when buffer is mapped and newly created we should use `buffer_.update_immediately`. */
  void *data_copy = MEM_mallocN(size_in_bytes_, __func__);
  memcpy(data_copy, data, size_in_bytes_);
  VKContext &context = *VKContext::get();
  buffer_.update_render_graph(context, data_copy);
}

void VKUniformBuffer::allocate()
{
  buffer_.create(size_in_bytes_,
                 GPU_USAGE_STATIC,
                 VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT |
                     VK_BUFFER_USAGE_TRANSFER_DST_BIT,
                 false);
  debug::object_label(buffer_.vk_handle(), name_);
}

void VKUniformBuffer::clear_to_zero()
{
  if (!buffer_.is_allocated()) {
    allocate();
  }
  VKContext &context = *VKContext::get();
  buffer_.clear(context, 0);
}

void VKUniformBuffer::ensure_updated()
{
  if (!buffer_.is_allocated()) {
    allocate();
  }

  /* Upload attached data, during bind time. */
  if (data_) {
    /* TODO: when buffer is mapped and newly created we should use `buffer_.update_immediately`. */
    VKContext &context = *VKContext::get();
    buffer_.update_render_graph(context, std::move(data_));
    data_ = nullptr;
  }
}

void VKUniformBuffer::bind(int slot)
{
  VKContext &context = *VKContext::get();
  context.state_manager_get().uniform_buffer_bind(this, slot);
}

void VKUniformBuffer::bind_as_ssbo(int slot)
{
  VKContext &context = *VKContext::get();
  context.state_manager_get().storage_buffer_bind(
      BindSpaceStorageBuffers::Type::UniformBuffer, this, slot);
}

void VKUniformBuffer::unbind()
{
  const VKContext *context = VKContext::get();
  if (context != nullptr) {
    VKStateManager &state_manager = context->state_manager_get();
    state_manager.uniform_buffer_unbind(this);
    state_manager.storage_buffer_unbind(this);
  }
}

}  // namespace blender::gpu