void FrameRenderer::render( Camera& cam, Node& root, const Viewport& vp ) const
{
/* Start time measurement.
*/
Stopwatch stopwatch;
/* Check for errors.
*/
REPORT_GL_ERROR;
/* Reshape render stages' buffers.
*/
for( std::size_t rsIdx = 0; rsIdx < stages(); ++rsIdx )
{
RenderStage& rs = stageAt( rsIdx );
/* Ensure buffers are properly sized.
*/
if( pimpl->reshaped || !rs.isInitialized() )
{
/* This 'const_cast' is okay, because 'RenderStage' objects are clearly
* stated to be components of a 'FrameRenderer', thus "it runs in the
* family" as long as an immutable 'RenderStage' reference not induces a
* mutable 'FrameRenderer' reference.
*/
FrameRenderer& fr = const_cast< FrameRenderer& >( *this );
rs.reshape( fr, pimpl->viewport->width(), pimpl->viewport->height() );
}
/* Notify stages of beginning frame.
*/
rs.prepareFrame( root );
}
/* Mark that all buffer sizes have been established.
*/
pimpl->reshaped = false;
/* Clear buffers.
*/
glClearColor
( pimpl->backgroundColor[ 0 ]
, pimpl->backgroundColor[ 1 ]
, pimpl->backgroundColor[ 2 ]
, pimpl->backgroundColor[ 3 ] );
/* Render frame.
*/
RenderTask task( *this, cam.projection(), cam.viewTransform() );
task.render( vp, GLContext::COLOR_BUFFER_BIT | GLContext::DEPTH_BUFFER_BIT );
/* Check for errors.
*/
REPORT_GL_ERROR;
/* Stop and evaluate time measurement.
*/
const double time = stopwatch.result();
const double fps = 1 / time;
pimpl->fpsData.push( fps );
pimpl->fpsStatistics = math::Statistics< double >( pimpl->fpsData.size(),
[&]( std::size_t idx )->double
{
return pimpl->fpsData[ idx ];
}
);
}
