/* 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"

#include "CLG_log.h"

static CLG_LogRef LOG = {"gpu.vulkan"};

namespace blender::gpu {

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

  if (data) {
    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);
    data_uploaded_ = true;
  }
}

void VKUniformBuffer::allocate()
{
  buffer_.create(size_in_bytes_,
                 VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT |
                     VK_BUFFER_USAGE_TRANSFER_DST_BIT,
                 VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
                 VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT,
                 VmaAllocationCreateFlags(0));
  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);
  data_uploaded_ = true;
}

void VKUniformBuffer::ensure_updated()
{
  if (!buffer_.is_allocated()) {
    allocate();
    if (!buffer_.is_allocated()) {
      CLOG_ERROR(&LOG,
                 "Unable to allocate uniform buffer [%s]. Most likely an out of memory issue.",
                 name_);
      return;
    }
  }

  /* Upload attached data, during bind time. */
  if (data_) {
    if (!data_uploaded_ && buffer_.is_mapped()) {
      buffer_.update_immediately(data_);
      MEM_freeN(data_);
      data_ = nullptr;
    }
    else {
      VKContext &context = *VKContext::get();
      buffer_.update_render_graph(context, std::move(data_));
      data_ = nullptr;
    }
    data_uploaded_ = true;
  }
}

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