qzdoom/src/hwrenderer/utility/hw_vrmodes.h

#pragma once

#include "r_data/matrix.h"

class DFrameBuffer;

enum
{
	VR_MONO = 0,
	VR_GREENMAGENTA = 1,
	VR_REDCYAN = 2,
	VR_SIDEBYSIDEFULL = 3,
	VR_SIDEBYSIDESQUISHED = 4,
	VR_LEFTEYEVIEW = 5,
	VR_RIGHTEYEVIEW = 6,
	VR_QUADSTEREO = 7,
	VR_AMBERBLUE = 9,
	VR_TOPBOTTOM = 11,
	VR_ROWINTERLEAVED = 12,
	VR_COLUMNINTERLEAVED = 13,
	VR_CHECKERINTERLEAVED = 14
};

struct VREyeInfo
{
	float mShiftFactor;
	float mScaleFactor;

	VSMatrix GetProjection(float fov, float aspectRatio, float fovRatio) const;
	DVector3 GetViewShift(float yaw) const;
private:
	float getShift() const;

};

struct VRMode
{
	int mEyeCount;
	float mHorizontalViewportScale;
	float mVerticalViewportScale;
	float mWeaponProjectionScale;
	VREyeInfo mEyes[2];

	static const VRMode *GetVRMode(bool toscreen = true);
	void AdjustViewport(DFrameBuffer *fb) const;
	VSMatrix GetHUDSpriteProjection() const;
};