#include <blit_command_vk.h>

Inheritance diagram for impeller::BlitGenerateMipmapCommandVK:

Public Member Functions
	~BlitGenerateMipmapCommandVK () 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::BlitGenerateMipmapCommand
std::shared_ptr< Texture >	texture

Public Attributes inherited from impeller::BlitCommand
std::string	label

Detailed Description

Definition at line 55 of file blit_command_vk.h.

Constructor & Destructor Documentation

◆ ~BlitGenerateMipmapCommandVK()

impeller::BlitGenerateMipmapCommandVK::~BlitGenerateMipmapCommandVK ( )

overridedefault

BlitGenerateMipmapCommandVK

Member Function Documentation

◆ Encode()

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

overridevirtual

Implements impeller::BlitEncodeVK.

Definition at line 246 of file blit_command_vk.cc.

                                                                         {
   auto& src = TextureVK::Cast(*texture);
  
   const auto size = src.GetTextureDescriptor().size;
   uint32_t mip_count = src.GetTextureDescriptor().mip_count;
  
   if (mip_count < 2u) {
     return true;
   }
  
   const auto& image = src.GetImage();
   const auto& cmd = encoder.GetCommandBuffer();
  
   if (!encoder.Track(texture)) {
     return false;
   }
  
   // Transition the base mip level to transfer-src layout so we can read from
   // it and transition the rest to dst-optimal since they are going to be
   // written to.
   InsertImageMemoryBarrier(
       cmd,                                   // command buffer
       image,                                 // image
       vk::AccessFlagBits::eTransferWrite,    // src access mask
       vk::AccessFlagBits::eTransferRead,     // dst access mask
       src.GetLayout(),                       // old layout
       vk::ImageLayout::eTransferSrcOptimal,  // new layout
       vk::PipelineStageFlagBits::eTransfer,  // src stage
       vk::PipelineStageFlagBits::eTransfer,  // dst stage
       0u                                     // mip level
   );
   InsertImageMemoryBarrier(
       cmd,                                   // command buffer
       image,                                 // image
       {},                                    // src access mask
       vk::AccessFlagBits::eTransferWrite,    // dst access mask
       vk::ImageLayout::eUndefined,           // old layout
       vk::ImageLayout::eTransferDstOptimal,  // new layout
       vk::PipelineStageFlagBits::eTransfer,  // src stage
       vk::PipelineStageFlagBits::eTransfer,  // dst stage
       1u,                                    // mip level
       mip_count - 1                          // mip level count
   );
  
   // Blit from the base mip level to all other levels.
   for (size_t mip_level = 1u; mip_level < mip_count; mip_level++) {
     vk::ImageBlit blit;
  
     blit.srcSubresource.aspectMask = vk::ImageAspectFlagBits::eColor;
     blit.srcSubresource.baseArrayLayer = 0u;
     blit.srcSubresource.layerCount = 1u;
     blit.srcSubresource.mipLevel = 0u;
  
     blit.dstSubresource.aspectMask = vk::ImageAspectFlagBits::eColor;
     blit.dstSubresource.baseArrayLayer = 0u;
     blit.dstSubresource.layerCount = 1u;
     blit.dstSubresource.mipLevel = mip_level;
  
     // offsets[0] is origin.
     blit.srcOffsets[1].x = size.width;
     blit.srcOffsets[1].y = size.height;
     blit.srcOffsets[1].z = 1u;
  
     // offsets[0] is origin.
     blit.dstOffsets[1].x = std::max<int32_t>(size.width >> mip_level, 1u);
     blit.dstOffsets[1].y = std::max<int32_t>(size.height >> mip_level, 1u);
     blit.dstOffsets[1].z = 1u;
  
     cmd.blitImage(image,                                 // src image
                   vk::ImageLayout::eTransferSrcOptimal,  // src layout
                   image,                                 // dst image
                   vk::ImageLayout::eTransferDstOptimal,  // dst layout
                   1u,                                    // region count
                   &blit,                                 // regions
                   vk::Filter::eLinear                    // filter
     );
   }
  
   // Transition all mip levels to shader read. The base mip level has a
   // different "old" layout than the rest now.
   InsertImageMemoryBarrier(
       cmd,                                         // command buffer
       image,                                       // image
       vk::AccessFlagBits::eTransferWrite,          // src access mask
       vk::AccessFlagBits::eShaderRead,             // dst access mask
       vk::ImageLayout::eTransferSrcOptimal,        // old layout
       vk::ImageLayout::eShaderReadOnlyOptimal,     // new layout
       vk::PipelineStageFlagBits::eTransfer,        // src stage
       vk::PipelineStageFlagBits::eFragmentShader,  // dst stage
       0u                                           // mip level
   );
   InsertImageMemoryBarrier(
       cmd,                                         // command buffer
       image,                                       // image
       vk::AccessFlagBits::eTransferWrite,          // src access mask
       vk::AccessFlagBits::eShaderRead,             // dst access mask
       vk::ImageLayout::eTransferDstOptimal,        // old layout
       vk::ImageLayout::eShaderReadOnlyOptimal,     // new layout
       vk::PipelineStageFlagBits::eTransfer,        // src stage
       vk::PipelineStageFlagBits::eFragmentShader,  // dst stage
       1u,                                          // mip level
       mip_count - 1                                // mip level count
   );
  
   // We modified the layouts of this image from underneath it. Tell it its new
   // state so it doesn't try to perform redundant transitions under the hood.
   src.SetLayoutWithoutEncoding(vk::ImageLayout::eShaderReadOnlyOptimal);
  
   return true;
 }

References impeller::BackendCast< TextureVK, Texture >::Cast(), impeller::CommandEncoderVK::GetCommandBuffer(), impeller::InsertImageMemoryBarrier(), impeller::BlitGenerateMipmapCommand::texture, and impeller::CommandEncoderVK::Track().

Referenced by impeller::testing::TEST().

◆ GetLabel()

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

overridevirtual

Implements impeller::BlitEncodeVK.

Definition at line 211 of file blit_command_vk.cc.

                                                       {
   return label;
 }

References impeller::BlitCommand::label.

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