hip/graphics_interop.cpp

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#ifdef WITH_HIP
 
#  include "device/hip/graphics_interop.h"
 
#  include "device/hip/device_impl.h"
#  include "device/hip/util.h"
 
CCL_NAMESPACE_BEGIN
 
HIPDeviceGraphicsInterop::HIPDeviceGraphicsInterop(HIPDeviceQueue *queue)
    : queue_(queue), device_(static_cast<HIPDevice *>(queue->device))
{
}
 
HIPDeviceGraphicsInterop::~HIPDeviceGraphicsInterop()
{
  HIPContextScope scope(device_);
  free();
}
 
void HIPDeviceGraphicsInterop::set_buffer(GraphicsInteropBuffer &interop_buffer)
{
  HIPContextScope scope(device_);
 
  if (interop_buffer.is_empty()) {
    free();
    return;
  }
 
  need_zero_ |= interop_buffer.take_zero();
 
  if (!interop_buffer.has_new_handle()) {
    return;
  }
 
  free();
 
  switch (interop_buffer.get_type()) {
    case GraphicsInteropDevice::OPENGL: {
      const hipError_t result = hipGraphicsGLRegisterBuffer(
          &hip_graphics_resource_, interop_buffer.take_handle(), hipGraphicsRegisterFlagsNone);
 
      if (result != hipSuccess) {
        LOG_ERROR << "Error registering OpenGL buffer: " << hipewErrorString(result);
        break;
      }
 
      buffer_size_ = interop_buffer.get_size();
 
      break;
    }
    case GraphicsInteropDevice::VULKAN:
    case GraphicsInteropDevice::METAL:
    case GraphicsInteropDevice::NONE:
      /* TODO: implement vulkan support. */
      break;
  }
}
 
device_ptr HIPDeviceGraphicsInterop::map()
{
  hipDeviceptr_t hip_buffer = 0;
 
  if (hip_graphics_resource_) {
    HIPContextScope scope(device_);
    size_t bytes;
 
    hip_device_assert(device_,
                      hipGraphicsMapResources(1, &hip_graphics_resource_, queue_->stream()));
    hip_device_assert(
        device_, hipGraphicsResourceGetMappedPointer(&hip_buffer, &bytes, hip_graphics_resource_));
  }
  else {
    /* Vulkan buffer is always mapped. */
    hip_buffer = hip_external_memory_ptr_;
  }
 
  if (hip_buffer && need_zero_) {
    hip_device_assert(device_, hipMemsetD8Async(hip_buffer, 0, buffer_size_, queue_->stream()));
 
    need_zero_ = false;
  }
 
  return static_cast<device_ptr>(hip_buffer);
}
 
void HIPDeviceGraphicsInterop::unmap()
{
  if (hip_graphics_resource_) {
    HIPContextScope scope(device_);
 
    hip_device_assert(device_,
                      hipGraphicsUnmapResources(1, &hip_graphics_resource_, queue_->stream()));
  }
}
 
void HIPDeviceGraphicsInterop::free()
{
  if (hip_graphics_resource_) {
    hip_device_assert(device_, hipGraphicsUnregisterResource(hip_graphics_resource_));
    hip_graphics_resource_ = nullptr;
  }
 
  if (hip_external_memory_ptr_) {
    hip_device_assert(device_, hipFree(hip_external_memory_ptr_));
    hip_external_memory_ptr_ = 0;
  }
 
  buffer_size_ = 0;
 
  need_zero_ = false;
}
 
CCL_NAMESPACE_END
 
#endif