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Classic rotatesprite: add assertion failing with DNF mod, comment another.

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Among other things, rotatesprite doesn't cope well with large zoom values.
Two assertions are added that guard qinterpolatedown16short() calls: in
the failing case, they would write outside the destination arrays.
Another (existing) assertion is commented a little and like for the first,
instructions are given how to reproduce its failure.

git-svn-id: https://svn.eduke32.com/eduke32@3754 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2013-05-12 18:51:30 +00:00
parent f0ae68f061
commit 9defc473c1
1 changed files with 18 additions and 3 deletions
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21
polymer/eduke32/build/src/engine.c
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@ -7186,7 +7186,11 @@ static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t
int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2,
int32_t uniqid)
{
int32_t cosang, sinang, v, nextv, dax1, dax2, oy, bx, by;
// NOTE: if these are made unsigned (for safety), angled tiles may draw
// incorrectly, showing vertical seams at intervals.
int32_t bx, by;
int32_t cosang, sinang, v, nextv, dax1, dax2, oy;
int32_t i, x, y, x1, y1, x2, y2, gx1, gy1;
intptr_t p, bufplc, palookupoffs;
int32_t xsiz, ysiz, xoff, yoff, npoints, yplc, yinc, lx, rx;
@ -7291,12 +7295,18 @@ static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t
if (dax2 > dax1)
{
yplc = y1 + mulscale16((dax1<<16)+65535-x1,yinc);
qinterpolatedown16short((intptr_t)(&uplc[dax1]),dax2-dax1,yplc,yinc);
// Assertion fails with DNF mod: in mapster32,
// set dt_t 3864 (bike HUD, 700x220)
// set dt_a 100
// set dt_z 1280000 <- CRASH!
Bassert((unsigned)dax1 < MAXXDIM && (unsigned)dax2 < MAXXDIM+1);
qinterpolatedown16short((intptr_t)&uplc[dax1], dax2-dax1, yplc, yinc);
}
else
{
yplc = y2 + mulscale16((dax2<<16)+65535-x2,yinc);
qinterpolatedown16short((intptr_t)(&dplc[dax2]),dax1-dax2,yplc,yinc);
Bassert((unsigned)dax2 < MAXXDIM && (unsigned)dax1 < MAXXDIM+1);
qinterpolatedown16short((intptr_t)&dplc[dax2], dax1-dax2, yplc, yinc);
}
}
nextv = v;
@ -7397,6 +7407,11 @@ static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t
by += (uint32_t)yv*(y1-oy); oy = y1;
// Assertion fails with DNF mod: in mapster32,
// set dt_t 3864 (bike HUD, 700x220)
// set dt_z 16777216
// <Increase yxaspect by pressing [9]> <-- CRASH!
// (It also fails when wrecking the bike in-game by driving into a wall.)
Bassert(bx >= 0);
bufplce[xx] = (bx>>16)*ysiz+bufplc;