Trying to save viewport


#1

Hi,

I’m trying to save a image of the viewport. I’m using this code. The format of the screen would be RGBA. I think I have the right code but something is missing.

// Set to the active camera
Image * OutputImage(new Image(context_));
Texture2D * pRenderTexture(new Texture2D(context_));
Texture2D * pDepthTexture(new Texture2D(context_));

// Set width and height
const unsigned int outputHeight = 900;
const unsigned int outputWidth = 1440;

// Set Image
OutputImage->SetSize(outputWidth, outputHeight,  4);

// Create necessary texture
pRenderTexture->SetSize(outputHeight, outputWidth, m_textureFormat, TEXTURE_RENDERTARGET);
pDepthTexture->SetSize(outputHeight, outputWidth, Graphics::GetDepthStencilFormat(), TEXTURE_DEPTHSTENCIL);

// Set parameneters
pRenderTexture->SetFilterMode(FILTER_NEAREST);
pDepthTexture->SetFilterMode(FILTER_NEAREST);

RenderSurface * pRenderSurface = pRenderTexture->GetRenderSurface();

// Set Render Surface
pRenderSurface->SetViewport(0, m_pCameraViewport);
pRenderSurface->SetUpdateMode(SURFACE_UPDATEALWAYS);
pRenderSurface->SetLinkedDepthStencil(pDepthTexture->GetRenderSurface());

// Queue Update
pRenderSurface->QueueUpdate();

unsigned char* _ImageData = new unsigned char[outputWidth*outputHeight*4];
pRenderTexture->GetData(0, _ImageData);

OutputImage->SetData(_ImageData);

OutputImage->SaveTGA("snapshoot.tga");

pRenderTexture->SaveTGA("test.tga");

Vivienne


#2

Hi Viv,

Maybe try RenderSurface::GetParentTexture() ?

ProcSky gets it from a TextureCube face, but I assume it works similarly.

     Texture2D* faceTex(static_cast<Texture2D*>(texCube->GetRenderSurface((CubeMapFace)faceIndex)->GetParentTexture()));

General Texture2D save

bool App::SaveTexturePNG(Texture2D* texture, const String& filePath) const {
  SharedPtr<Image> image(new Image(context_));
  image->SetSize(texture->GetWidth(), texture->GetHeight(), texture->GetComponents());

  if (texture->GetData(0, image->GetData())) {
    if (image->SavePNG(filePath)) {
      URHO3D_LOGINFO("Save texture: " + filePath);
      return true;
    }
  } else {
    URHO3D_LOGERROR("Save texture: " + filePath + " : failed GetData().");
  }
  return false;
}

#3

It could also be that the render target hadn’t been written to by the time you fetch it’s data (I ran into that problem with some textures I only wanted for one frame - you could only read the data after the update during the next frame, but I also constructed everything in that scene solely for that one frame, I wasn’t saving an already present view port).


#4

Hmmm. That might be the problem.