impeller::BlitCopyTextureToBufferCommandGLES Struct Reference

#include <blit_command_gles.h>

Inheritance diagram for impeller::BlitCopyTextureToBufferCommandGLES:

Public Member Functions
	~BlitCopyTextureToBufferCommandGLES () override
std::string	GetLabel () const override
bool	Encode (const ReactorGLES &reactor) const override
Public Member Functions inherited from impeller::BlitEncodeGLES
virtual	~BlitEncodeGLES ()

Additional Inherited Members
Static Public Member Functions inherited from impeller::BackendCast< BlitEncodeGLES, BlitCommand >
static BlitEncodeGLES &	Cast (BlitCommand &base)
static const BlitEncodeGLES &	Cast (const BlitCommand &base)
static BlitEncodeGLES *	Cast (BlitCommand *base)
static const BlitEncodeGLES *	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 43 of file blit_command_gles.h.

Constructor & Destructor Documentation

~BlitCopyTextureToBufferCommandGLES()

impeller::BlitCopyTextureToBufferCommandGLES::~BlitCopyTextureToBufferCommandGLES ( )

overridedefault

Member Function Documentation

Encode()

bool impeller::BlitCopyTextureToBufferCommandGLES::Encode ( const ReactorGLES &  reactor ) const

overridevirtual

Implements impeller::BlitEncodeGLES.

Definition at line 265 of file blit_command_gles.cc.

                                      {
  const auto& gl = reactor.GetProcTable();
 
  PixelFormat source_format = source->GetTextureDescriptor().format;
  std::optional<PixelFormatGLES> gles_format =
      ToPixelFormatGLES(source_format,
                        /*supports_bgra=*/
                        reactor.GetProcTable().GetDescription()->HasExtension(
                            "GL_EXT_texture_format_BGRA8888"));
 
  if (!gles_format.has_value()) {
    VALIDATION_LOG << "Texture has unsupported pixel format.";
    return false;
  }
 
  TextureCoordinateSystem coord_system = source->GetCoordinateSystem();
 
  GLuint read_fbo = GL_NONE;
  fml::ScopedCleanupClosure delete_fbos(
      [&gl, &read_fbo]() { DeleteFBO(gl, read_fbo, GL_FRAMEBUFFER); });
 
  {
    auto read = ConfigureFBO(gl, source, GL_FRAMEBUFFER);
    if (!read.has_value()) {
      return false;
    }
    read_fbo = read.value();
  }
 
  DeviceBufferGLES::Cast(*destination)
      .UpdateBufferData(
          [&gl,                                                          //
           this,                                                         //
           format = gles_format->external_format,                        //
           type = gles_format->type,                                     //
           coord_system,                                                 //
           bytes_per_pixel = BytesPerPixelForPixelFormat(source_format)  //
  ](uint8_t* data, size_t length) {
            gl.ReadPixels(source_region.GetX(), source_region.GetY(),
                          source_region.GetWidth(), source_region.GetHeight(),
                          format, type, data + destination_offset);
            switch (coord_system) {
              case TextureCoordinateSystem::kUploadFromHost:
                break;
              case TextureCoordinateSystem::kRenderToTexture:
                // The texture is upside down, and must be inverted when copying
                // byte data out.
                FlipImage(data + destination_offset, source_region.GetWidth(),
                          source_region.GetHeight(), bytes_per_pixel);
            }
          });
 
  return true;
};

References impeller::BytesPerPixelForPixelFormat(), impeller::BackendCast< DeviceBufferGLES, DeviceBuffer >::Cast(), impeller::ConfigureFBO(), impeller::DeleteFBO(), impeller::BlitCopyTextureToBufferCommand::destination, impeller::BlitCopyTextureToBufferCommand::destination_offset, impeller::ProcTableGLES::GetDescription(), impeller::TRect< T >::GetHeight(), impeller::ReactorGLES::GetProcTable(), impeller::TRect< T >::GetWidth(), impeller::TRect< T >::GetX(), impeller::TRect< T >::GetY(), impeller::DescriptionGLES::HasExtension(), impeller::kRenderToTexture, impeller::kUploadFromHost, impeller::BlitCopyTextureToBufferCommand::source, impeller::BlitCopyTextureToBufferCommand::source_region, impeller::ToPixelFormatGLES(), impeller::DeviceBufferGLES::UpdateBufferData(), and VALIDATION_LOG.

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

GetLabel()

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

overridevirtual

Implements impeller::BlitEncodeGLES.

Definition at line 261 of file blit_command_gles.cc.

                                                             {
  return label;
}

References impeller::BlitCommand::label.

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

• impeller/renderer/backend/gles/blit_command_gles.h
• impeller/renderer/backend/gles/blit_command_gles.cc