impeller::BlitResizeTextureCommandGLES Struct Reference

#include <blit_command_gles.h>

Inheritance diagram for impeller::BlitResizeTextureCommandGLES:

Public Member Functions
	~BlitResizeTextureCommandGLES () 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::BlitResizeTextureCommand
std::shared_ptr< Texture >	source
std::shared_ptr< Texture >	destination
Public Attributes inherited from impeller::BlitCommand
std::string	label

Detailed Description

Definition at line 62 of file blit_command_gles.h.

Constructor & Destructor Documentation

~BlitResizeTextureCommandGLES()

impeller::BlitResizeTextureCommandGLES::~BlitResizeTextureCommandGLES ( )

overridedefault

Member Function Documentation

Encode()

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

overridevirtual

Implements impeller::BlitEncodeGLES.

Definition at line 401 of file blit_command_gles.cc.

                                                                          {
  const auto& gl = reactor.GetProcTable();
 
  // glBlitFramebuffer is a GLES3 proc. Since we target GLES2, we need to
  // emulate the blit when it's not available in the driver.
  if (!gl.BlitFramebuffer.IsAvailable()) {
    // TODO(157064): Emulate the blit using a raster draw call here.
    VALIDATION_LOG << "Texture blit fallback not implemented yet for GLES2.";
    return false;
  }
 
  destination->SetCoordinateSystem(source->GetCoordinateSystem());
 
  GLuint read_fbo = GL_NONE;
  GLuint draw_fbo = GL_NONE;
  fml::ScopedCleanupClosure delete_fbos([&gl, &read_fbo, &draw_fbo]() {
    DeleteFBO(gl, read_fbo, GL_READ_FRAMEBUFFER);
    DeleteFBO(gl, draw_fbo, GL_DRAW_FRAMEBUFFER);
  });
 
  {
    auto read = ConfigureFBO(gl, source, GL_READ_FRAMEBUFFER);
    if (!read.has_value()) {
      return false;
    }
    read_fbo = read.value();
  }
 
  {
    auto draw = ConfigureFBO(gl, destination, GL_DRAW_FRAMEBUFFER);
    if (!draw.has_value()) {
      return false;
    }
    draw_fbo = draw.value();
  }
 
  gl.Disable(GL_SCISSOR_TEST);
  gl.Disable(GL_DEPTH_TEST);
  gl.Disable(GL_STENCIL_TEST);
 
  const IRect source_region = IRect::MakeSize(source->GetSize());
  const IRect destination_region = IRect::MakeSize(destination->GetSize());
 
  gl.BlitFramebuffer(source_region.GetX(),            // srcX0
                     source_region.GetY(),            // srcY0
                     source_region.GetWidth(),        // srcX1
                     source_region.GetHeight(),       // srcY1
                     destination_region.GetX(),       // dstX0
                     destination_region.GetY(),       // dstY0
                     destination_region.GetWidth(),   // dstX1
                     destination_region.GetHeight(),  // dstY1
                     GL_COLOR_BUFFER_BIT,             // mask
                     GL_LINEAR                        // filter
  );
 
  return true;
}

References impeller::ConfigureFBO(), impeller::DeleteFBO(), impeller::TRect< T >::GetHeight(), impeller::ReactorGLES::GetProcTable(), impeller::TRect< T >::GetWidth(), impeller::TRect< T >::GetX(), impeller::TRect< T >::GetY(), and VALIDATION_LOG.

GetLabel()

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

overridevirtual

Implements impeller::BlitEncodeGLES.

Definition at line 397 of file blit_command_gles.cc.

                                                       {
  return "Resize Texture";
}

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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