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upgrade the renderer to use 32-bit integer math (#43)

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* upgrade renderer to use 32-bit integer math

* extensive commenting
This commit is contained in:
Fabian Greffrath 2020-01-20 10:31:17 +01:00 committed by GitHub
parent 4d3826b6f0
commit 5f957facd1
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 33 additions and 29 deletions
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13
Source/r_defs.h
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@ -303,7 +303,7 @@ typedef struct drawseg_s
// Pointers to lists for sprite clipping,
// all three adjusted so [x1] is first value.
short *sprtopclip, *sprbottomclip, *maskedtexturecol;
int *sprtopclip, *sprbottomclip, *maskedtexturecol; // [FG] 32-bit integer math
} drawseg_t;
//
@ -401,11 +401,12 @@ typedef struct visplane
int picnum, lightlevel, minx, maxx;
fixed_t height;
fixed_t xoffs, yoffs; // killough 2/28/98: Support scrolling flats
unsigned short pad1; // leave pads for [minx-1]/[maxx+1]
unsigned short top[MAX_SCREENWIDTH];
unsigned short pad2, pad3; // killough 2/8/98, 4/25/98
unsigned short bottom[MAX_SCREENWIDTH];
unsigned short pad4;
// [FG] 32-bit integer math
unsigned int pad1; // leave pads for [minx-1]/[maxx+1]
unsigned int top[MAX_SCREENWIDTH];
unsigned int pad2, pad3; // killough 2/8/98, 4/25/98
unsigned int bottom[MAX_SCREENWIDTH];
unsigned int pad4;
} visplane_t;
#endif

12
Source/r_plane.c
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@ -66,13 +66,13 @@ visplane_t *floorplane, *ceilingplane;
// killough 8/1/98: set static number of openings to be large enough
// (a static limit is okay in this case and avoids difficulties in r_segs.c)
#define MAXOPENINGS (MAX_SCREENWIDTH*MAX_SCREENHEIGHT)
short openings[MAXOPENINGS],*lastopening;
int openings[MAXOPENINGS],*lastopening; // [FG] 32-bit integer math
// Clip values are the solid pixel bounding the range.
// floorclip starts out SCREENHEIGHT
// ceilingclip starts out -1
short floorclip[MAX_SCREENWIDTH], ceilingclip[MAX_SCREENWIDTH];
int floorclip[MAX_SCREENWIDTH], ceilingclip[MAX_SCREENWIDTH]; // [FG] 32-bit integer math
// spanstart holds the start of a plane span; initialized to 0 at start
@ -269,7 +269,7 @@ visplane_t *R_CheckPlane(visplane_t *pl, int start, int stop)
else
unionh = pl->maxx, intrh = stop;
for (x=intrl ; x <= intrh && pl->top[x] == 0xffff; x++)
for (x=intrl ; x <= intrh && pl->top[x] == 0xffffffffu; x++) // [FG] 32-bit integer math
;
if (x > intrh)
@ -297,7 +297,7 @@ visplane_t *R_CheckPlane(visplane_t *pl, int start, int stop)
// R_MakeSpans
//
static void R_MakeSpans(int x, int t1, int b1, int t2, int b2)
static void R_MakeSpans(int x, unsigned int t1, unsigned int b1, unsigned int t2, unsigned int b2) // [FG] 32-bit integer math
{
for (; t1 < t2 && t1 <= b1; t1++)
R_MapPlane(t1, spanstart[t1], x-1);
@ -378,7 +378,7 @@ static void do_draw_plane(visplane_t *pl)
// killough 10/98: Use sky scrolling offset, and possibly flip picture
for (x = pl->minx; (dc_x = x) <= pl->maxx; x++)
if ((dc_yl = pl->top[x]) <= (dc_yh = pl->bottom[x]))
if ((unsigned)(dc_yl = pl->top[x]) <= (dc_yh = pl->bottom[x])) // [FG] 32-bit integer math
{
dc_source = R_GetColumn(texture, ((an + xtoviewangle[x])^flip) >>
ANGLETOSKYSHIFT);
@ -405,7 +405,7 @@ static void do_draw_plane(visplane_t *pl)
stop = pl->maxx + 1;
planezlight = zlight[light];
pl->top[pl->minx-1] = pl->top[stop] = 0xffff;
pl->top[pl->minx-1] = pl->top[stop] = 0xffffffffu; // [FG] 32-bit integer math
for (x = pl->minx ; x <= stop ; x++)
R_MakeSpans(x,pl->top[x-1],pl->bottom[x-1],pl->top[x],pl->bottom[x]);

4
Source/r_plane.h
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@ -35,9 +35,9 @@
#define PL_SKYFLAT (0x80000000)
// Visplane related.
extern short *lastopening;
extern int *lastopening; // [FG] 32-bit integer math
extern short floorclip[], ceilingclip[];
extern int floorclip[], ceilingclip[]; // [FG] 32-bit integer math
extern fixed_t yslope[], distscale[];
void R_InitPlanes(void);

10
Source/r_segs.c
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@ -81,7 +81,7 @@ static fixed_t topfrac;
static fixed_t topstep;
static fixed_t bottomfrac;
static fixed_t bottomstep;
static short *maskedtexturecol;
static int *maskedtexturecol; // [FG] 32-bit integer math
//
// R_RenderMaskedSegRange
@ -158,7 +158,7 @@ void R_RenderMaskedSegRange(drawseg_t *ds, int x1, int x2)
// draw the columns
for (dc_x = x1 ; dc_x <= x2 ; dc_x++, spryscale += rw_scalestep)
if (maskedtexturecol[dc_x] != D_MAXSHORT)
if (maskedtexturecol[dc_x] != D_MAXINT) // [FG] 32-bit integer math
{
if (!fixedcolormap) // calculate lighting
{ // killough 11/98:
@ -203,7 +203,7 @@ void R_RenderMaskedSegRange(drawseg_t *ds, int x1, int x2)
col = (column_t *)((byte *)
R_GetColumn(texnum,maskedtexturecol[dc_x]) - 3);
R_DrawMaskedColumn (col);
maskedtexturecol[dc_x] = D_MAXSHORT;
maskedtexturecol[dc_x] = D_MAXINT; // [FG] 32-bit integer math
}
// Except for main_tranmap, mark others purgable at this point
@ -729,13 +729,13 @@ void R_StoreWallRange(const int start, const int stop)
// save sprite clipping info
if ((ds_p->silhouette & SIL_TOP || maskedtexture) && !ds_p->sprtopclip)
{
memcpy (lastopening, ceilingclip+start, 2*(rw_stopx-start));
memcpy (lastopening, ceilingclip+start, sizeof(*lastopening)*(rw_stopx-start)); // [FG] 32-bit integer math
ds_p->sprtopclip = lastopening - start;
lastopening += rw_stopx - start;
}
if ((ds_p->silhouette & SIL_BOTTOM || maskedtexture) && !ds_p->sprbottomclip)
{
memcpy (lastopening, floorclip+start, 2*(rw_stopx-start));
memcpy (lastopening, floorclip+start, sizeof(*lastopening)*(rw_stopx-start)); // [FG] 32-bit integer math
ds_p->sprbottomclip = lastopening - start;
lastopening += rw_stopx - start;
}

14
Source/r_things.c
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@ -63,8 +63,9 @@ static lighttable_t **spritelights; // killough 1/25/98 made static
// constant arrays
// used for psprite clipping and initializing clipping
short negonearray[MAX_SCREENWIDTH]; // killough 2/8/98:
short screenheightarray[MAX_SCREENWIDTH]; // change to MAX_*
// [FG] 32-bit integer math
int negonearray[MAX_SCREENWIDTH]; // killough 2/8/98:
int screenheightarray[MAX_SCREENWIDTH]; // change to MAX_*
//
// INITIALIZATION FUNCTIONS
@ -303,8 +304,8 @@ vissprite_t *R_NewVisSprite(void)
// in posts/runs of opaque pixels.
//
short *mfloorclip;
short *mceilingclip;
int *mfloorclip; // [FG] 32-bit integer math
int *mceilingclip; // [FG] 32-bit integer math
fixed_t spryscale;
fixed_t sprtopscreen;
@ -819,8 +820,9 @@ void R_SortVisSprites (void)
void R_DrawSprite (vissprite_t* spr)
{
drawseg_t *ds;
short clipbot[MAX_SCREENWIDTH]; // killough 2/8/98:
short cliptop[MAX_SCREENWIDTH]; // change to MAX_*
// [FG] 32-bit integer math
int clipbot[MAX_SCREENWIDTH]; // killough 2/8/98:
int cliptop[MAX_SCREENWIDTH]; // change to MAX_*
int x;
int r1;
int r2;

9
Source/r_things.h
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@ -35,13 +35,14 @@
// Constant arrays used for psprite clipping and initializing clipping.
extern short negonearray[MAX_SCREENWIDTH]; // killough 2/8/98:
extern short screenheightarray[MAX_SCREENWIDTH]; // change to MAX_*
// [FG] 32-bit integer math
extern int negonearray[MAX_SCREENWIDTH]; // killough 2/8/98:
extern int screenheightarray[MAX_SCREENWIDTH]; // change to MAX_*
// Vars for R_DrawMaskedColumn
extern short *mfloorclip;
extern short *mceilingclip;
extern int *mfloorclip; // [FG] 32-bit integer math
extern int *mceilingclip; // [FG] 32-bit integer math
extern fixed_t spryscale;
extern fixed_t sprtopscreen;
extern fixed_t pspritescale;