- make FieldOfView a real angle and remove all uses of finetangent.

src/r_main.cpp

@@ -179,7 +179,7 @@ static inline int viewangletox(int i)
 
 	// Don't waste time calculating the tangent of values outside the valid range.
 	// Checking the index where tan(i) becomes too large is a lot faster
-	if (i <= 604)	// 604 is the highest index with finetangent < -2*FRACUNIT
+	if (i <= 604)	// 604 is the highest index with tan < -2
 	{
 		return viewwidth + 1;
 	}
@@ -207,7 +207,7 @@ void R_InitTextureMapping ()
 	FocalLengthY = FocalLengthX * YaspectMul;
 
 	// This is 1/FocalTangent before the widescreen extension of FOV.
-	viewingrangerecip = DivScale32(1, finetangent[FINEANGLES/4+(FieldOfView/2)]);
+	viewingrangerecip = FLOAT2FIXED(1. / tan(FieldOfView.Radians() / 2));
 
 	// [RH] Do not generate viewangletox, because texture mapping is no
 	// longer done with trig, so it's not needed.

src/r_sky.cpp

@@ -115,8 +115,8 @@ void R_InitSkyMap ()
 		skyiscale = float(r_Yaspect / freelookviewheight);
 		skyscale = freelookviewheight / r_Yaspect;
 
-		skyiscale *= FieldOfView / 2048.f;
-		skyscale *= 2048.0 / FieldOfView;
+		skyiscale *= float(FieldOfView.Degrees / 90.);
+		skyscale *= float(90. / FieldOfView.Degrees);
 	}
 
 	if (skystretch)

src/r_state.h

@@ -82,7 +82,7 @@ extern AActor*			camera;		// [RH] camera instead of viewplayer
 extern sector_t*		viewsector;	// [RH] keep track of sector viewing from
 
 extern angle_t			xtoviewangle[MAXWIDTH+1];
-extern int				FieldOfView;
+extern DAngle			FieldOfView;
 
 int R_FindSkin (const char *name, int pclass);	// [RH] Find a skin
 

src/r_swrenderer.cpp

@@ -50,8 +50,6 @@ void R_SetupColormap(player_t *);
 void R_SetupFreelook();
 void R_InitRenderer();
 
-extern float LastFOV;
-
 //==========================================================================
 //
 // DCanvas :: Init
@@ -272,8 +270,8 @@ void FSoftwareRenderer::RenderTextureView (FCanvasTexture *tex, AActor *viewpoin
 	unsigned char *savecolormap = fixedcolormap;
 	FSpecialColormap *savecm = realfixedcolormap;
 
-	float savedfov = LastFOV;
-	R_SetFOV ((float)fov);
+	DAngle savedfov = FieldOfView;
+	R_SetFOV ((double)fov);
 	R_RenderViewToCanvas (viewpoint, Canvas, 0, 0, tex->GetWidth(), tex->GetHeight(), tex->bFirstUpdate);
 	R_SetFOV (savedfov);
 	if (Pixels == Canvas->GetBuffer())

src/r_utility.cpp

@@ -138,7 +138,6 @@ angle_t			LocalViewAngle;
 int				LocalViewPitch;
 bool			LocalKeyboardTurner;
 
-float			LastFOV;
 int				WidescreenRatio;
 int				setblocks;
 int				extralight;
@@ -147,7 +146,7 @@ double			FocalTangent;
 
 unsigned int	R_OldBlend = ~0;
 int 			validcount = 1; 	// increment every time a check is made
-int				FieldOfView = 2048;		// Fineangles in the SCREENWIDTH wide window
+DAngle			FieldOfView = 90.;		// Angles in the SCREENWIDTH wide window
 
 FCanvasTextureInfo *FCanvasTextureInfo::List;
 
@@ -169,13 +168,6 @@ void R_InitTables (void)
 	int i;
 	const double pimul = M_PI*2/FINEANGLES;
 
-	// viewangle tangent table
-	finetangent[0] = (fixed_t)(FRACUNIT*g_tan ((0.5-FINEANGLES/4)*pimul)+0.5);
-	for (i = 1; i < FINEANGLES/2; i++)
-	{
-		finetangent[i] = (fixed_t)(FRACUNIT*g_tan ((i-FINEANGLES/4)*pimul)+0.5);
-	}
-	
 	// finesine table
 	for (i = 0; i < FINEANGLES/4; i++)
 	{
@@ -202,33 +194,18 @@ void R_InitTables (void)
 //
 //==========================================================================
 
-void R_SetFOV (float fov)
+void R_SetFOV (DAngle fov)
 {
-	if (fov < 5.f)
-		fov = 5.f;
-	else if (fov > 170.f)
-		fov = 170.f;
-	if (fov != LastFOV)
+
+	if (fov < 5.) fov = 5.;
+	else if (fov > 170.) fov = 170.;
+	if (fov != FieldOfView)
 	{
-		LastFOV = fov;
-		FieldOfView = (int)(fov * (float)FINEANGLES / 360.f);
+		FieldOfView = fov;
 		setsizeneeded = true;
 	}
 }
 
-//==========================================================================
-//
-// R_GetFOV
-//
-// Returns the current field of view in degrees
-//
-//==========================================================================
-
-float R_GetFOV ()
-{
-	return LastFOV;
-}
-
 //==========================================================================
 //
 // R_SetViewSize
@@ -292,18 +269,16 @@ void R_SetWindow (int windowSize, int fullWidth, int fullHeight, int stHeight)
 	}
 
 
-	int fov = FieldOfView;
+	DAngle fov = FieldOfView;
 
 	// For widescreen displays, increase the FOV so that the middle part of the
 	// screen that would be visible on a 4:3 display has the requested FOV.
 	if (centerxwide != centerx)
 	{ // centerxwide is what centerx would be if the display was not widescreen
-		fov = int(atan(double(centerx)*tan(double(fov)*M_PI/(FINEANGLES))/double(centerxwide))*(FINEANGLES)/M_PI);
-		if (fov > 170*FINEANGLES/360)
-			fov = 170*FINEANGLES/360;
+		fov = DAngle::ToDegrees(2 * atan(centerx * tan(fov.Radians()/2) / double(centerxwide)));
+		if (fov > 170.) fov = 170.;
 	}
-
-	FocalTangent = FIXED2FLOAT(finetangent[FINEANGLES/4+fov/2]);
+	FocalTangent = tan(fov.Radians() / 2);
 	Renderer->SetWindow(windowSize, fullWidth, fullHeight, stHeight, trueratio);
 }
 

src/r_utility.h

@@ -85,8 +85,7 @@ bool R_GetViewInterpolationStatus();
 void R_ClearInterpolationPath();
 void R_AddInterpolationPoint(const DVector3a &vec);
 void R_SetViewSize (int blocks);
-void R_SetFOV (float fov);
-float R_GetFOV ();
+void R_SetFOV (DAngle fov);
 void R_SetupFrame (AActor * camera);
 void R_SetViewAngle ();
 

src/tables.cpp

@@ -19,22 +19,14 @@
 //		Do not try to look them up :-).
 //		In the order of appearance: 
 //
-//		int finetangent[4096]	- Tangens LUT.
-//		 Should work with BAM fairly well (12 of 16bit,
-//		effectively, by shifting).
-//
 //		int finesine[10240] 			- Sine lookup.
 //		 Guess what, serves as cosine, too.
 //		 Remarkable thing is, how to use BAMs with this? 
 //		
-//		int tantoangle[2049]	- ArcTan LUT,
-//		  maps tan(angle) to angle fast. Gotta search.
-//		
 //	  
 //-----------------------------------------------------------------------------
 
 #include "tables.h"
 
-fixed_t finetangent[4096];
 fixed_t finesine[10240];
 

src/tables.h

@@ -19,10 +19,6 @@
 //		Do not try to look them up :-).
 //		In the order of appearance: 
 //
-//		int finetangent[4096]	- Tangens LUT.
-//		 Should work with BAM fairly well (12 of 16bit,
-//		effectively, by shifting).
-//
 //		int finesine[10240] 			- Sine lookup.
 //		 Remarkable thing is, how to use BAMs with this? 
 //
@@ -46,9 +42,6 @@
 // Effective size is 10240.
 extern	fixed_t 		finesine[5*FINEANGLES/4];
 
-// Effective size is 4096.
-extern fixed_t			finetangent[FINEANGLES/2];
-
 // Binary Angle Measument, BAM.
 #define ANGLE_90		(0x40000000)
 #define ANGLE_180		(0x80000000)