impeller::BlitCopyTextureToBufferCommandVK Struct Reference

#include <blit_command_vk.h>

Inheritance diagram for impeller::BlitCopyTextureToBufferCommandVK:

Public Member Functions
	~BlitCopyTextureToBufferCommandVK () override
std::string	GetLabel () const override
bool	Encode (CommandEncoderVK &encoder) const override
Public Member Functions inherited from impeller::BlitEncodeVK
virtual	~BlitEncodeVK ()

Additional Inherited Members
Static Public Member Functions inherited from impeller::BackendCast< BlitEncodeVK, BlitCommand >
static BlitEncodeVK &	Cast (BlitCommand &base)
static const BlitEncodeVK &	Cast (const BlitCommand &base)
static BlitEncodeVK *	Cast (BlitCommand *base)
static const BlitEncodeVK *	Cast (const BlitCommand *base)
Public Attributes inherited from impeller::BlitCopyTextureToBufferCommand
std::shared_ptr< Texture >	source
std::shared_ptr< DeviceBuffer >	destination
IRect	source_region
size_t	destination_offset
Public Attributes inherited from impeller::BlitCommand
std::string	label

Detailed Description

Definition at line 38 of file blit_command_vk.h.

Constructor & Destructor Documentation

~BlitCopyTextureToBufferCommandVK()

impeller::BlitCopyTextureToBufferCommandVK::~BlitCopyTextureToBufferCommandVK ( )

overridedefault

BlitCopyTextureToBufferCommandVK

Member Function Documentation

Encode()

bool impeller::BlitCopyTextureToBufferCommandVK::Encode ( CommandEncoderVK &  encoder ) const

overridevirtual

Implements impeller::BlitEncodeVK.

Definition at line 150 of file blit_command_vk.cc.

                                                                             {
  const auto& cmd_buffer = encoder.GetCommandBuffer();
 
  // cast source and destination to TextureVK
  const auto& src = TextureVK::Cast(*source);
 
  if (!encoder.Track(source) || !encoder.Track(destination)) {
    return false;
  }
 
  BarrierVK barrier;
  barrier.cmd_buffer = cmd_buffer;
  barrier.new_layout = vk::ImageLayout::eTransferSrcOptimal;
  barrier.src_access = vk::AccessFlagBits::eShaderWrite |
                       vk::AccessFlagBits::eTransferWrite |
                       vk::AccessFlagBits::eColorAttachmentWrite;
  barrier.src_stage = vk::PipelineStageFlagBits::eFragmentShader |
                      vk::PipelineStageFlagBits::eTransfer |
                      vk::PipelineStageFlagBits::eColorAttachmentOutput;
  barrier.dst_access = vk::AccessFlagBits::eShaderRead;
  barrier.dst_stage = vk::PipelineStageFlagBits::eVertexShader |
                      vk::PipelineStageFlagBits::eFragmentShader;
 
  const auto& dst = DeviceBufferVK::Cast(*destination);
 
  vk::BufferImageCopy image_copy;
  image_copy.setBufferOffset(destination_offset);
  image_copy.setBufferRowLength(0);
  image_copy.setBufferImageHeight(0);
  image_copy.setImageSubresource(
      vk::ImageSubresourceLayers(vk::ImageAspectFlagBits::eColor, 0, 0, 1));
  image_copy.setImageOffset(
      vk::Offset3D(source_region.GetX(), source_region.GetY(), 0));
  image_copy.setImageExtent(
      vk::Extent3D(source_region.GetWidth(), source_region.GetHeight(), 1));
 
  if (!src.SetLayout(barrier)) {
    VALIDATION_LOG << "Could not encode layout transition.";
    return false;
  }
 
  cmd_buffer.copyImageToBuffer(src.GetImage(),      //
                               barrier.new_layout,  //
                               dst.GetBuffer(),     //
                               image_copy           //
  );
 
  // If the buffer is used for readback, then apply a transfer -> host memory
  // barrier.
  if (destination->GetDeviceBufferDescriptor().readback) {
    vk::MemoryBarrier barrier;
    barrier.srcAccessMask = vk::AccessFlagBits::eTransferWrite;
    barrier.dstAccessMask = vk::AccessFlagBits::eHostRead;
 
    cmd_buffer.pipelineBarrier(vk::PipelineStageFlagBits::eTransfer,
                               vk::PipelineStageFlagBits::eHost, {}, 1,
                               &barrier, 0, {}, 0, {});
  }
 
  return true;
}

GetLabel()

std::string impeller::BlitCopyTextureToBufferCommandVK::GetLabel ( ) const

overridevirtual

Implements impeller::BlitEncodeVK.

Definition at line 146 of file blit_command_vk.cc.

                                                           {
  return label;
}

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The documentation for this struct was generated from the following files:

• impeller/renderer/backend/vulkan/blit_command_vk.h
• impeller/renderer/backend/vulkan/blit_command_vk.cc