#include "externals.hh"
#include "demo.hh"


T_Demo::T_Demo( __rd__ const uint32_t width ,
		__rd__ const uint32_t height )
	: width( width ) , height( height )
{ }


bool T_Demo::initialise( )
{
	raymarcher = std::make_unique< T_Raymarcher >(
			width , height );
	dof = std::make_unique< T_DoFPass >(
			raymarcher->output( ) , raymarcher->depth( ) );
	bloom = std::make_unique< T_BloomPass >(
			raymarcher->output( ) );
	combine = std::make_unique< T_CombinePass >(
			dof->output( ) , bloom->output( ) );
	fxaa = std::make_unique< T_FXAAPass >(
			combine->output( ) );
	return true;
}

void T_Demo::makeUI( )
{
	auto const& dspSize( ImGui::GetIO( ).DisplaySize );
	ImGui::SetNextWindowSize( ImVec2( 300 , dspSize.y - 300 ) ,
			ImGuiSetCond_Once );
	ImGui::SetNextWindowPos( ImVec2( 0 , 150 ) ,
			ImGuiSetCond_Once );
	ImGui::Begin( "Demo controls" );

	raymarcher->makeUI( );
	dof->makeUI( );
	bloom->makeUI( );
	combine->makeUI( );
	fxaa->makeUI( );

	ImGui::End( );
}

void T_Demo::render( )
{
	if ( playing ) {
		const float time = SDL_GetTicks( ) * 1e-3;
		if ( playingPrevious ) {
			const float adv = time - lastFrame;
			position = std::min( adv + position , sync.duration( ) );
			if ( position >= sync.duration( ) ) {
				playing = false;
			}
		}
		lastFrame = time;
	}
	playingPrevious = playing;

	raymarcher->render( );
	dof->render( position , sync );
	bloom->render( );
	combine->render( );
	fxaa->render( );
}

void T_Demo::handleDND(
		__rd__	ImVec2 const& move ,
		__rd__	const bool hasCtrl ,
		__rd__	const bool hasShift ,
		__rd__	const bool lmb		// Left mouse button
	)
{
	raymarcher->camera( ).handleDND( move , hasCtrl , hasShift , lmb );
}

void T_Demo::handleWheel(
		__rd__	const float wheel ,
		__rd__	const bool hasCtrl ,
		__rd__	const bool hasShift
	)
{
	raymarcher->camera( ).handleWheel( wheel , hasCtrl , hasShift );
}