/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2022 Olive Team
  Modifications Copyright (C) 2025 mikesolar

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "scopebase.h"

#include "config/config.h"
#include "render/job/colortransformjob.h"

namespace olive
{

#define super ManagedDisplayWidget

ScopeBase::ScopeBase(QWidget *parent)
	: super(parent)
	, texture_(nullptr)
	, managed_tex_up_to_date_(false)
{
	EnableDefaultContextMenu();
}

void ScopeBase::SetBuffer(TexturePtr frame)
{
	texture_ = frame;
	managed_tex_up_to_date_ = false;
	update();
}

void ScopeBase::showEvent(QShowEvent *e)
{
	super::showEvent(e);
}

void ScopeBase::DrawScope(TexturePtr managed_tex, QVariant pipeline)
{
	ShaderJob job;

	job.Insert(QStringLiteral("ove_maintex"),
			   NodeValue(NodeValue::kTexture,
						 QVariant::fromValue(managed_tex)));

	renderer()->Blit(pipeline, job, GetViewportParams());
}

void ScopeBase::OnInit()
{
	super::OnInit();

	pipeline_ = renderer()->CreateNativeShader(GenerateShaderCode());
}

void ScopeBase::OnPaint()
{
	if (IsBackendNeutral()) {
		// TODO: implement backend-neutral scope display
		return;
	}

	// Clear display surface
	renderer()->ClearDestination();

	if (texture_) {
		// Convert reference frame to display space
		if (!managed_tex_ || !managed_tex_up_to_date_ ||
			managed_tex_->params() != texture_->params()) {
			managed_tex_ = renderer()->CreateTexture(texture_->params());

			ColorTransformJob job;
			job.SetColorProcessor(color_service());
			job.SetInputTexture(texture_);
			job.SetInputAlphaAssociation(kAlphaNone);

			renderer()->BlitColorManaged(job, managed_tex_.get());
		}

		DrawScope(managed_tex_, pipeline_);
	}
}

void ScopeBase::OnDestroy()
{
	managed_tex_ = nullptr;
	texture_ = nullptr;
	pipeline_.clear();

	super::OnDestroy();
}

}