test2/source/blender/gpu/vulkan/vk_immediate.cc

/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup gpu
 *
 * Mimics old style OpenGL immediate mode drawing.
 */

#include "vk_immediate.hh"
#include "vk_backend.hh"
#include "vk_context.hh"
#include "vk_data_conversion.hh"
#include "vk_framebuffer.hh"
#include "vk_state_manager.hh"

#include "CLG_log.h"

namespace blender::gpu {

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

VKImmediate::VKImmediate() {}
VKImmediate::~VKImmediate()
{
  BLI_assert_msg(recycling_buffers_.is_empty(),
                 "VKImmediate::deinit must be called before destruction.");
  BLI_assert_msg(active_buffers_.is_empty(),
                 "VKImmediate::deinit must be called before destruction");
}

void VKImmediate::deinit(VKDevice &device)
{
  while (!recycling_buffers_.is_empty()) {
    std::unique_ptr<VKBuffer> buffer = recycling_buffers_.pop_last();
    buffer->free_immediately(device);
    buffer.release();
  }
  while (!active_buffers_.is_empty()) {
    std::unique_ptr<VKBuffer> buffer = active_buffers_.pop_last();
    buffer->free_immediately(device);
    buffer.release();
  }
}

uchar *VKImmediate::begin()
{
  const VKWorkarounds &workarounds = VKBackend::get().device.workarounds_get();
  vertex_format_converter.init(&vertex_format, workarounds);
  const size_t bytes_needed = vertex_buffer_size(&vertex_format_converter.device_format_get(),
                                                 vertex_len);
  VKBuffer &buffer = ensure_space(bytes_needed);
  current_subbuffer_len_ = bytes_needed;

  uchar *data = static_cast<uchar *>(buffer.mapped_memory_get());
  return data + buffer_offset_;
}

void VKImmediate::end()
{
  BLI_assert_msg(prim_type != GPU_PRIM_NONE, "Illegal state: not between an immBegin/End pair.");
  if (vertex_idx == 0) {
    return;
  }

  if (vertex_format_converter.needs_conversion()) {
    /* Determine the start of the subbuffer. The `vertex_data` attribute changes when new vertices
     * are loaded.
     */
    uchar *data = static_cast<uchar *>(active_buffers_.last()->mapped_memory_get()) +
                  buffer_offset_;
    vertex_format_converter.convert(data, data, vertex_idx);
  }

  VKContext &context = *VKContext::get();
  BLI_assert(context.shader == unwrap(shader));
  render_graph::VKResourceAccessInfo &resource_access_info = context.reset_and_get_access_info();
  vertex_attributes_.update_bindings(*this);
  context.active_framebuffer_get()->rendering_ensure(context);

  render_graph::VKDrawNode::CreateInfo draw(resource_access_info);
  draw.node_data.vertex_count = vertex_idx;
  draw.node_data.instance_count = 1;
  draw.node_data.first_vertex = 0;
  draw.node_data.first_instance = 0;
  vertex_attributes_.bind(draw.node_data.vertex_buffers);
  context.update_pipeline_data(prim_type, vertex_attributes_, draw.node_data.pipeline_data);

  context.render_graph.add_node(draw);

  buffer_offset_ += current_subbuffer_len_;
  current_subbuffer_len_ = 0;
  vertex_format_converter.reset();
}

VKBufferWithOffset VKImmediate::active_buffer() const
{
  VKBufferWithOffset result = {active_buffers_.last()->vk_handle(), buffer_offset_};
  return result;
}

VkDeviceSize VKImmediate::buffer_bytes_free()
{
  return active_buffers_.last()->size_in_bytes() - buffer_offset_;
}

static VkDeviceSize new_buffer_size(size_t sub_buffer_size)
{
  return max_ulul(sub_buffer_size, DEFAULT_INTERNAL_BUFFER_SIZE);
}

VKBuffer &VKImmediate::ensure_space(size_t bytes_needed)
{
  /* Last used buffer still has space. */
  if (!active_buffers_.is_empty() && buffer_bytes_free() >= bytes_needed) {
    return *active_buffers_.last();
  }

  /* Recycle a previous buffer. */
  if (!recycling_buffers_.is_empty() && recycling_buffers_.last()->size_in_bytes() >= bytes_needed)
  {
    CLOG_INFO(&LOG, 2, "Activating recycled buffer");
    buffer_offset_ = 0;
    active_buffers_.append(recycling_buffers_.pop_last());
    return *active_buffers_.last();
  }

  size_t alloc_size = new_buffer_size(bytes_needed);
  CLOG_INFO(&LOG, 2, "Allocate buffer (size=%d)", int(alloc_size));
  buffer_offset_ = 0;
  active_buffers_.append(std::make_unique<VKBuffer>());
  VKBuffer &result = *active_buffers_.last();
  result.create(new_buffer_size(bytes_needed),
                GPU_USAGE_DYNAMIC,
                VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT);
  debug::object_label(result.vk_handle(), "Immediate");

  return result;
}

void VKImmediate::reset()
{
  if (!recycling_buffers_.is_empty()) {
    CLOG_INFO(&LOG, 2, "Discarding %d unused buffers", int(recycling_buffers_.size()));
  }
  recycling_buffers_.clear();
  recycling_buffers_ = std::move(active_buffers_);
}

}  // namespace blender::gpu