// 
//---------------------------------------------------------------------------
//
// Copyright(C) 2015 Christopher Bruns
// All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see http://www.gnu.org/licenses/
//
//--------------------------------------------------------------------------
//
/*
** gl_stereo3d.cpp
** Stereoscopic 3D API
**
*/

#include "gl/system/gl_system.h"
#include "gl/stereo3d/gl_stereo3d.h"
#include "gl/renderer/gl_renderer.h"
#include "vectors.h" // RAD2DEG
#include "doomtype.h" // M_PI

namespace s3d {


/* virtual */
VSMatrix EyePose::GetProjection(float fov, float aspectRatio, float fovRatio) const
{
	VSMatrix result;

	// Lifted from gl_scene.cpp FGLRenderer::SetProjection()
	float fovy = (float)(2 * RAD2DEG(atan(tan(DEG2RAD(fov) / 2) / fovRatio)));
	result.perspective(fovy, aspectRatio, FGLRenderer::GetZNear(), FGLRenderer::GetZFar());

	return result;
}

/* virtual */
Viewport EyePose::GetViewport(const Viewport& fullViewport) const 
{
	return fullViewport;
}


/* virtual */
void EyePose::GetViewShift(float yaw, float outViewShift[3]) const
{
	// pass-through for Mono view
	outViewShift[0] = 0;
	outViewShift[1] = 0;
	outViewShift[2] = 0;
}


Stereo3DMode::Stereo3DMode()
{
}

Stereo3DMode::~Stereo3DMode()
{
}

// Avoid static initialization order fiasco by declaring first Mode type (Mono) here in the
// same source file as Stereo3DMode::getCurrentMode()
// https://isocpp.org/wiki/faq/ctors#static-init-order

/* static */
const MonoView& MonoView::getInstance() 
{
	static MonoView instance;
	return instance;
}

} /* namespace s3d */