1 files changed, 160 insertions, 0 deletions

diff --git a/xbmc/utils/DumbBufferObject.cpp b/xbmc/utils/DumbBufferObject.cpp
new file mode 100644
index 0000000..84d28ea
--- /dev/null
+++ b/xbmc/utils/DumbBufferObject.cpp
@@ -0,0 +1,160 @@
+/*
+ *  Copyright (C) 2005-2020 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#include "DumbBufferObject.h"
+
+#include "ServiceBroker.h"
+#include "utils/BufferObjectFactory.h"
+#include "utils/log.h"
+#include "windowing/gbm/WinSystemGbm.h"
+#include "windowing/gbm/WinSystemGbmEGLContext.h"
+
+#include <drm_fourcc.h>
+#include <sys/mman.h>
+
+using namespace KODI::WINDOWING::GBM;
+
+std::unique_ptr<CBufferObject> CDumbBufferObject::Create()
+{
+  return std::make_unique<CDumbBufferObject>();
+}
+
+void CDumbBufferObject::Register()
+{
+  CBufferObjectFactory::RegisterBufferObject(CDumbBufferObject::Create);
+}
+
+CDumbBufferObject::CDumbBufferObject()
+{
+  auto winSystem = static_cast<CWinSystemGbmEGLContext*>(CServiceBroker::GetWinSystem());
+
+  m_device = winSystem->GetDrm()->GetFileDescriptor();
+}
+
+CDumbBufferObject::~CDumbBufferObject()
+{
+  ReleaseMemory();
+  DestroyBufferObject();
+}
+
+bool CDumbBufferObject::CreateBufferObject(uint32_t format, uint32_t width, uint32_t height)
+{
+  if (m_fd >= 0)
+    return true;
+
+  uint32_t bpp;
+
+  switch (format)
+  {
+    case DRM_FORMAT_ARGB1555:
+    case DRM_FORMAT_RGB565:
+      bpp = 16;
+      break;
+    case DRM_FORMAT_ARGB8888:
+      bpp = 32;
+      break;
+    default:
+      throw std::runtime_error("CDumbBufferObject: pixel format not implemented");
+  }
+
+  struct drm_mode_create_dumb create_dumb = {.height = height, .width = width, .bpp = bpp};
+
+  int ret = drmIoctl(m_device, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb);
+  if (ret < 0)
+  {
+    CLog::Log(LOGERROR, "CDumbBufferObject::{} - ioctl DRM_IOCTL_MODE_CREATE_DUMB failed, errno={}",
+              __FUNCTION__, strerror(errno));
+    return false;
+  }
+
+  m_size = create_dumb.size;
+  m_stride = create_dumb.pitch;
+
+  ret = drmPrimeHandleToFD(m_device, create_dumb.handle, 0, &m_fd);
+  if (ret < 0)
+  {
+    CLog::Log(LOGERROR, "CDumbBufferObject::{} - failed to get fd from prime handle, errno={}",
+              __FUNCTION__, strerror(errno));
+    return false;
+  }
+
+  return true;
+}
+
+void CDumbBufferObject::DestroyBufferObject()
+{
+  if (m_fd < 0)
+    return;
+
+  int ret = close(m_fd);
+  if (ret < 0)
+    CLog::Log(LOGERROR, "CDumbBufferObject::{} - close failed, errno={}", __FUNCTION__,
+              strerror(errno));
+
+  m_fd = -1;
+  m_stride = 0;
+  m_size = 0;
+}
+
+uint8_t* CDumbBufferObject::GetMemory()
+{
+  if (m_fd < 0)
+    return nullptr;
+
+  if (m_map)
+  {
+    CLog::Log(LOGDEBUG, "CDumbBufferObject::{} - already mapped fd={} map={}", __FUNCTION__, m_fd,
+              fmt::ptr(m_map));
+    return m_map;
+  }
+
+  uint32_t handle;
+  int ret = drmPrimeFDToHandle(m_device, m_fd, &handle);
+  if (ret < 0)
+  {
+    CLog::Log(LOGERROR, "CDumbBufferObject::{} - failed to get handle from prime fd, errno={}",
+              __FUNCTION__, strerror(errno));
+    return nullptr;
+  }
+
+  struct drm_mode_map_dumb map_dumb = {.handle = handle};
+
+  ret = drmIoctl(m_device, DRM_IOCTL_MODE_MAP_DUMB, &map_dumb);
+  if (ret < 0)
+  {
+    CLog::Log(LOGERROR, "CDumbBufferObject::{} - ioctl DRM_IOCTL_MODE_MAP_DUMB failed, errno={}",
+              __FUNCTION__, strerror(errno));
+    return nullptr;
+  }
+
+  m_offset = map_dumb.offset;
+
+  m_map = static_cast<uint8_t*>(mmap(nullptr, m_size, PROT_WRITE, MAP_SHARED, m_device, m_offset));
+  if (m_map == MAP_FAILED)
+  {
+    CLog::Log(LOGERROR, "CDumbBufferObject::{} - mmap failed, errno={}", __FUNCTION__,
+              strerror(errno));
+    return nullptr;
+  }
+
+  return m_map;
+}
+
+void CDumbBufferObject::ReleaseMemory()
+{
+  if (!m_map)
+    return;
+
+  int ret = munmap(m_map, m_size);
+  if (ret < 0)
+    CLog::Log(LOGERROR, "CDumbBufferObject::{} - munmap failed, errno={}", __FUNCTION__,
+              strerror(errno));
+
+  m_map = nullptr;
+  m_offset = 0;
+}