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https://git.do.srb2.org/STJr/SRB2.git
synced 2025-01-18 07:22:28 +00:00
Make papersprite projection completely correct in software
I heard properpaper had some weird crashes? I couldn't reproduce them no matter how hard I tried, but I added some bounds checking to this version too just in case. Gotta get other people's help to try to reproduce those.
This commit is contained in:
fickleheart
parent
0fbc459243
commit
c0380a3052
2 changed files with 47 additions and 62 deletions
106
src/r_things.c
106
src/r_things.c
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@ -743,7 +743,8 @@ void R_DrawFlippedMaskedColumn(column_t *column, INT32 texheight)
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static void R_DrawVisSprite(vissprite_t *vis)
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{
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column_t *column;
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#ifdef RANGECHECK
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//#ifdef RANGECHECK
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#if 1
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INT32 texturecolumn;
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#endif
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fixed_t frac;
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@ -895,21 +896,34 @@ static void R_DrawVisSprite(vissprite_t *vis)
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for (dc_x = vis->x1; dc_x <= vis->x2; dc_x++, frac += vis->xiscale)
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{
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#ifdef RANGECHECK
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texturecolumn = frac>>FRACBITS;
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if (texturecolumn < 0 || texturecolumn >= SHORT(patch->width))
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I_Error("R_DrawSpriteRange: bad texturecolumn at %d from end", vis->x2 - dc_x);
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column = (column_t *)((UINT8 *)patch + LONG(patch->columnofs[texturecolumn]));
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#else
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column = (column_t *)((UINT8 *)patch + LONG(patch->columnofs[frac>>FRACBITS]));
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#endif
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if (vis->scalestep)
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{
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angle_t angle = ((vis->centerangle + xtoviewangle[dc_x]) >> ANGLETOFINESHIFT) & 0xFFF;
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texturecolumn = (vis->paperoffset - FixedMul(FINETANGENT(angle), vis->paperdistance)) >> FRACBITS;
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if (texturecolumn < 0 || texturecolumn >= SHORT(patch->width))
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{
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spryscale += vis->scalestep;
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continue;
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}
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if (vis->xiscale < 0)
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texturecolumn = SHORT(patch->width) - 1 - texturecolumn;
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sprtopscreen = (centeryfrac - FixedMul(dc_texturemid, spryscale));
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dc_iscale = (0xffffffffu / (unsigned)spryscale);
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}
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else
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{
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texturecolumn = frac>>FRACBITS;
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#ifdef RANGECHECK
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if (texturecolumn < 0 || texturecolumn >= SHORT(patch->width))
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I_Error("R_DrawSpriteRange: bad texturecolumn at %d from end", vis->x2 - dc_x);
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#endif
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}
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column = (column_t *)((UINT8 *)patch + LONG(patch->columnofs[texturecolumn]));
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if (vis->cut & SC_VFLIP)
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R_DrawFlippedMaskedColumn(column, patch->height);
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else
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@ -1073,8 +1087,6 @@ static void R_SplitSprite(vissprite_t *sprite)
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}
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}
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//#define PROPERPAPER // This was reverted less than 7 hours before 2.2's release because of very strange, frequent crashes.
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//
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// R_ProjectSprite
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// Generates a vissprite for a thing
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@ -1111,7 +1123,9 @@ static void R_ProjectSprite(mobj_t *thing)
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fixed_t iscale;
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fixed_t scalestep;
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fixed_t offset, offset2;
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boolean papersprite = !!(thing->frame & FF_PAPERSPRITE);
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fixed_t paperoffset = 0, paperdistance = 0; angle_t centerangle = 0;
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INT32 dispoffset = thing->info->dispoffset;
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@ -1130,10 +1144,6 @@ static void R_ProjectSprite(mobj_t *thing)
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UINT32 rollangle = AngleFixed(arollangle)>>FRACBITS;
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#endif
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#ifndef PROPERPAPER
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fixed_t ang_scale = FRACUNIT;
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#endif
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// transform the origin point
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tr_x = thing->x - viewx;
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tr_y = thing->y - viewy;
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@ -1216,13 +1226,7 @@ static void R_ProjectSprite(mobj_t *thing)
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#endif
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if (sprframe->rotate != SRF_SINGLE || papersprite)
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{
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ang = R_PointToAngle (thing->x, thing->y) - (thing->player ? thing->player->drawangle : thing->angle);
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#ifndef PROPERPAPER
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if (papersprite)
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ang_scale = abs(FINESINE(ang>>ANGLETOFINESHIFT));
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#endif
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}
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if (sprframe->rotate == SRF_SINGLE)
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{
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@ -1283,31 +1287,11 @@ static void R_ProjectSprite(mobj_t *thing)
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else
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offset = -spr_offset;
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offset = FixedMul(offset, this_scale);
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#ifndef PROPERPAPER
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tx += FixedMul(offset, ang_scale);
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x1 = (centerxfrac + FixedMul (tx,xscale)) >>FRACBITS;
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// off the right side?
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if (x1 > viewwidth)
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return;
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#endif
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offset2 = FixedMul(spr_width, this_scale);
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#ifndef PROPERPAPER
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tx += FixedMul(offset2, ang_scale);
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x2 = ((centerxfrac + FixedMul (tx,xscale)) >> FRACBITS) - (papersprite ? 2 : 1);
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// off the left side
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if (x2 < 0)
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return;
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#endif
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if (papersprite)
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{
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fixed_t
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#ifdef PROPERPAPER
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xscale2,
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#endif
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yscale2, cosmul, sinmul, tz2;
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fixed_t xscale2, yscale2, cosmul, sinmul, tz2;
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INT32 range;
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if (ang >= ANGLE_180)
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@ -1327,7 +1311,6 @@ static void R_ProjectSprite(mobj_t *thing)
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yscale = FixedDiv(projectiony, tz);
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if (yscale < 64) return; // Fix some funky visuals
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#ifdef PROPERPAPER
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gxt = -FixedMul(tr_x, viewsin);
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gyt = FixedMul(tr_y, viewcos);
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tx = -(gyt + gxt);
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@ -1337,7 +1320,16 @@ static void R_ProjectSprite(mobj_t *thing)
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// off the right side?
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if (x1 > viewwidth)
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return;
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#endif
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// Get paperoffset (offset) and paperoffset (distance)
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paperoffset = -FixedMul(tr_x, cosmul) - FixedMul(tr_y, sinmul);
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paperdistance = -FixedMul(tr_x, sinmul) + FixedMul(tr_y, cosmul);
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if (paperdistance < 0)
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{
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paperoffset = -paperoffset;
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paperdistance = -paperdistance;
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}
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centerangle = viewangle - thing->angle;
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tr_x += FixedMul(offset2, cosmul);
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tr_y += FixedMul(offset2, sinmul);
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@ -1347,36 +1339,25 @@ static void R_ProjectSprite(mobj_t *thing)
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yscale2 = FixedDiv(projectiony, tz2);
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if (yscale2 < 64) return; // ditto
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#ifdef PROPERPAPER
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gxt = -FixedMul(tr_x, viewsin);
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gyt = FixedMul(tr_y, viewcos);
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tx = -(gyt + gxt);
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xscale2 = FixedDiv(projection, tz2);
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x2 = (centerxfrac + FixedMul(tx,xscale2))>>FRACBITS; x2--;
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x2 = ((centerxfrac + FixedMul(tx,xscale2))>>FRACBITS);
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// off the left side
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if (x2 < 0)
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return;
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#endif
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if (max(tz, tz2) < FixedMul(MINZ, this_scale)) // non-papersprite clipping is handled earlier
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return;
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if ((range = x2 - x1) <= 0)
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return;
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#ifdef PROPERPAPER
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range++; // fencepost problem
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#endif
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scalestep = (yscale2 - yscale)/range;
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xscale =
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#ifdef PROPERPAPER
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FixedDiv(range<<FRACBITS, abs(offset2))+1
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#else
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FixedMul(xscale, ang_scale)
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#endif
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;
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scalestep = ((yscale2 - yscale)/range) ?: 1;
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xscale = FixedDiv(range<<FRACBITS, abs(offset2));
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// The following two are alternate sorting methods which might be more applicable in some circumstances. TODO - maybe enable via MF2?
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// sortscale = max(yscale, yscale2);
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@ -1386,7 +1367,6 @@ static void R_ProjectSprite(mobj_t *thing)
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{
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scalestep = 0;
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yscale = sortscale;
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#ifdef PROPERPAPER
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tx += offset;
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x1 = (centerxfrac + FixedMul(tx,xscale))>>FRACBITS;
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@ -1400,7 +1380,6 @@ static void R_ProjectSprite(mobj_t *thing)
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// off the left side
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if (x2 < 0)
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return;
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#endif
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}
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if ((thing->flags2 & MF2_LINKDRAW) && thing->tracer) // toast 16/09/16 (SYMMETRY)
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@ -1521,6 +1500,9 @@ static void R_ProjectSprite(mobj_t *thing)
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vis->pzt = vis->pz + vis->thingheight;
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vis->texturemid = vis->gzt - viewz;
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vis->scalestep = scalestep;
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vis->paperoffset = paperoffset;
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vis->paperdistance = paperdistance;
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vis->centerangle = centerangle;
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vis->mobj = thing; // Easy access! Tails 06-07-2002
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@ -181,8 +181,11 @@ typedef struct vissprite_s
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fixed_t startfrac; // horizontal position of x1
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fixed_t scale, sortscale; // sortscale only differs from scale for paper sprites and MF2_LINKDRAW
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fixed_t scalestep; // only for paper sprites, 0 otherwise
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fixed_t paperoffset, paperdistance; // for paper sprites, offset/dist relative to the angle
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fixed_t xiscale; // negative if flipped
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angle_t centerangle; // for paper sprites
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fixed_t texturemid;
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patch_t *patch;
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