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Backported changes from devel branch.

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Marisa the Magician 2019-02-08 14:56:02 +01:00
commit 4e27e614a7
8 changed files with 60 additions and 18 deletions
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zscript/dt_coordutil.zsc Normal file
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/*
Coordinate Utility helper class.
(C)2018 Marisa Kirisame, UnSX Team.
Released under the GNU Lesser General Public License version 3 (or later).
See https://www.gnu.org/licenses/lgpl-3.0.txt for its terms.
*/
Class dt_CoordUtil
{
// projects a world point onto screen
// view matrix setup mostly pulled from gutawer's code
static Vector3 WorldToScreen( Vector3 vect, Vector3 eye, double pitch, double yaw, double roll, double vfov )
{
double ar = Screen.getWidth()/double(Screen.getHeight());
double fovr = (ar>=1.3)?1.333333:ar;
double fov = 2*atan(tan(clamp(vfov,5,170)*0.5)/fovr);
float pr = level.pixelstretch;
double angx = cos(pitch);
double angy = sin(pitch)*pr;
double alen = sqrt(angx*angx+angy*angy);
double apitch = asin(angy/alen);
double ayaw = yaw-90;
// rotations
dt_Matrix4 mRoll = dt_Matrix4.rotate((0,0,1),roll);
dt_Matrix4 mPitch = dt_Matrix4.rotate((1,0,0),apitch);
dt_Matrix4 mYaw = dt_Matrix4.rotate((0,-1,0),ayaw);
// scaling
dt_Matrix4 mScale = dt_Matrix4.identity();
mScale.set(1,1,pr);
// YZ swap
dt_Matrix4 mYZ = dt_Matrix4.create();
mYZ.set(0,0,1);
mYZ.set(2,1,1);
mYZ.set(1,2,-1);
mYZ.set(3,3,1);
// translation
dt_Matrix4 mMove = dt_Matrix4.identity();
mMove.set(3,0,-eye.x);
mMove.set(3,1,-eye.y);
mMove.set(3,2,-eye.z);
// perspective
dt_Matrix4 mPerspective = dt_Matrix4.perspective(fov,ar,5,65535);
// full matrix
dt_Matrix4 mView = mRoll.mul(mPitch);
mView = mView.mul(mYaw);
mView = mView.mul(mScale);
mView = mView.mul(mYZ);
mView = mView.mul(mMove);
dt_Matrix4 mWorldToScreen = mPerspective.mul(mView);
return mWorldToScreen.vmat(vect);
}
// converts a projected screen position to 2D canvas coords
// thanks once again to gutawer for making this thing screenblocks-aware
// [NEW] added second return value: true if the point has valid depth (i.e.: it's not behind view)
// [TODO] handle forced aspect ratio (e.g.: 320x200 scaling)
static Vector2, bool ToViewport( Vector3 screenpos, bool scrblocks = true )
{
if ( scrblocks )
{
int winx, winy, winw, winh;
[winx,winy,winw,winh] = Screen.getViewWindow();
int sh = Screen.getHeight();
int ht = sh;
int screenblocks = CVar.GetCVar("screenblocks",players[consoleplayer]).getInt();
if ( screenblocks < 10 ) ht = (screenblocks*sh/10)&~7;
int bt = sh-(ht+winy-((ht-winh)/2));
return (winx,sh-bt-ht)+((screenpos.x+1)*winw,(-screenpos.y+1)*ht)*0.5, (screenpos.z<=1.0);
}
else return ((screenpos.x+1)*Screen.getWidth(),(-screenpos.y+1)*Screen.getHeight())*0.5, (screenpos.z<=1.0);
}
}