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improvements to vertical scrolling detection for sky textures (#2312)

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Fabian Greffrath 2025-07-11 11:06:05 +02:00 committed by GitHub
parent 1a5b3e4187
commit 89901e543c
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GPG Key ID: B5690EEEBB952194
3 changed files with 14 additions and 6 deletions
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14
src/r_plane.c
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@ -405,7 +405,6 @@ static void DrawSkyTex(visplane_t *pl, sky_t *sky, skytex_t *skytex)
{
const side_t * const side = sky->side;
const int texture = texturetranslation[skytex->texture];
boolean vertically_scrolling = false;
dc_texheight = textureheight[texture] >> FRACBITS;
dc_iscale = FixedMul(skyiscale, skytex->scaley);
@ -415,13 +414,11 @@ static void DrawSkyTex(visplane_t *pl, sky_t *sky, skytex_t *skytex)
deltay = LerpFixed(skytex->prevy, skytex->curry);
deltax = LerpFixed(skytex->prevx, skytex->currx) << (ANGLETOSKYSHIFT - FRACBITS);
dc_texturemid = skytex->mid + deltay;
vertically_scrolling = skytex->scrolly;
if (side)
{
deltax += LerpFixed(side->oldtextureoffset, side->basetextureoffset);
dc_texturemid += side->baserowoffset;
vertically_scrolling += (side->baserowoffset - side->oldrowoffset);
}
}
else
@ -429,13 +426,11 @@ static void DrawSkyTex(visplane_t *pl, sky_t *sky, skytex_t *skytex)
deltay = skytex->curry;
deltax = skytex->currx << (ANGLETOSKYSHIFT - FRACBITS);
dc_texturemid = skytex->mid + deltay;
vertically_scrolling = skytex->scrolly;
if (side)
{
deltax += side->textureoffset;
dc_texturemid += side->baserowoffset;
vertically_scrolling += (side->baserowoffset - side->oldrowoffset);
}
}
@ -448,7 +443,14 @@ static void DrawSkyTex(visplane_t *pl, sky_t *sky, skytex_t *skytex)
angle_t an = viewangle + deltax;
if (colfunc != R_DrawTLColumn && !vertically_scrolling && dc_texheight >= 128)
if (sky->texturemid_tic != gametic)
{
sky->vertically_scrolling = (sky->old_texturemid != dc_texturemid);
sky->old_texturemid = dc_texturemid;
sky->texturemid_tic = gametic;
}
if (colfunc != R_DrawTLColumn && !sky->vertically_scrolling && dc_texheight >= 128)
{
// Make sure the fade-to-color effect doesn't happen too early
fixed_t diff = dc_texturemid - SCREENHEIGHT / 2 * FRACUNIT;

2
src/r_sky.c
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@ -311,6 +311,8 @@ static skyindex_t AddLevelsky(int texture, side_t *side)
R_InitFireSky(&new_sky);
}
new_sky.texturemid_tic = -1;
const int skyheight = textureheight[new_sky.background.texture] >> FRACBITS;
new_sky.stretchable = true;

4
src/r_skydefs.h
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@ -60,6 +60,10 @@ typedef struct sky_s
// Plain levelskies, flatmap
boolean stretchable;
boolean vertically_scrolling;
int old_texturemid;
int texturemid_tic;
} sky_t;
typedef struct