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 335 of file blit_command_gles.cc.

                                      {
  if (source->GetTextureDescriptor().format != PixelFormat::kR8G8B8A8UNormInt) {
    VALIDATION_LOG << "Only textures with pixel format RGBA are supported yet.";
    return false;
  }
 
  const auto& gl = reactor.GetProcTable();
  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, coord_system,
                         rows = source->GetSize().height](uint8_t* data,
 
                                                          size_t length) {
        gl.ReadPixels(source_region.GetX(), source_region.GetY(),
                      source_region.GetWidth(), source_region.GetHeight(),
                      GL_RGBA, GL_UNSIGNED_BYTE, 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(), 4);
        }
      });
 
  return true;
};

References impeller::BackendCast< DeviceBufferGLES, DeviceBuffer >::Cast(), impeller::ConfigureFBO(), data, impeller::DeleteFBO(), impeller::BlitCopyTextureToBufferCommand::destination, impeller::ReactorGLES::GetProcTable(), impeller::kR8G8B8A8UNormInt, impeller::BlitCopyTextureToBufferCommand::source, 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 331 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