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Move calculation of rotated patch dimensions into its own function

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Simplify rotation code when the pivot isn't in the center
This commit is contained in:
Jaime Passos 2020-10-11 03:39:31 -03:00
parent 6145442a34
commit b808b3ef41
2 changed files with 102 additions and 78 deletions
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4
src/r_patch.c
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@ -47,11 +47,11 @@ patch_t *Patch_Create(softwarepatch_t *source, size_t srcsize, void *dest)
}
if (!srcsize)
I_Error("R_CreatePatch: no source size!");
I_Error("Patch_Create: no source size!");
colsize = (INT32)(srcsize) - (INT32)offs;
if (colsize <= 0)
I_Error("R_CreatePatch: no column data!");
I_Error("Patch_Create: no column data!");
patch->columns = Z_Calloc(colsize, PU_PATCH_DATA, NULL);
M_Memcpy(patch->columns, ((UINT8 *)source + LONG(source->columnofs[0])), colsize);

176
src/r_patchrotation.c
View file

@ -82,6 +82,9 @@ patch_t *Patch_GetRotatedSprite(spriteframe_t *sprite, size_t frame, size_t spri
}
RotatedPatch_DoRotation(rotsprite, patch, rotationangle, xpivot, ypivot, flip);
//BP: we cannot use special tric in hardware mode because feet in ground caused by z-buffer
((patch_t *)rotsprite->patches[idx])->topoffset += FEETADJUST>>FRACBITS;
}
return rotsprite->patches[idx];
@ -102,10 +105,32 @@ rotsprite_t *RotatedPatch_Create(INT32 numangles)
return rotsprite;
}
static void RotatedPatch_CalculateDimensions(
INT32 width, INT32 height,
fixed_t ca, fixed_t sa,
INT32 *newwidth, INT32 *newheight)
{
fixed_t fixedwidth = (width * FRACUNIT);
fixed_t fixedheight = (height * FRACUNIT);
fixed_t w1 = abs(FixedMul(fixedwidth, ca) - FixedMul(fixedheight, sa));
fixed_t w2 = abs(FixedMul(-fixedwidth, ca) - FixedMul(fixedheight, sa));
fixed_t h1 = abs(FixedMul(fixedwidth, sa) + FixedMul(fixedheight, ca));
fixed_t h2 = abs(FixedMul(-fixedwidth, sa) + FixedMul(fixedheight, ca));
w1 = FixedInt(FixedCeil(w1 + (FRACUNIT/2)));
w2 = FixedInt(FixedCeil(w2 + (FRACUNIT/2)));
h1 = FixedInt(FixedCeil(h1 + (FRACUNIT/2)));
h2 = FixedInt(FixedCeil(h2 + (FRACUNIT/2)));
*newwidth = max(width, max(w1, w2));
*newheight = max(height, max(h1, h2));
}
void RotatedPatch_DoRotation(rotsprite_t *rotsprite, patch_t *patch, INT32 angle, INT32 xpivot, INT32 ypivot, boolean flip)
{
patch_t *rotated;
UINT16 *rawdst;
UINT16 *rawdst, *rawconv;
size_t size;
pictureflags_t bflip = (flip) ? PICFLAGS_XFLIP : 0;
@ -114,18 +139,20 @@ void RotatedPatch_DoRotation(rotsprite_t *rotsprite, patch_t *patch, INT32 angle
INT32 leftoffset = patch->leftoffset;
INT32 newwidth, newheight;
INT32 dx, dy;
fixed_t ca = rollcosang[angle];
fixed_t sa = rollsinang[angle];
fixed_t xcenter, ycenter;
INT32 idx = angle;
INT32 x, y;
INT32 sx, sy;
INT32 dx, dy;
INT32 ox, oy;
INT32 minx, miny, maxx, maxy;
// Don't cache angle = 0
if (angle < 1 || angle >= ROTANGLES)
return;
#define ROTSPRITE_XCENTER (newwidth / 2)
#define ROTSPRITE_YCENTER (newheight / 2)
if (flip)
{
idx += rotsprite->angles;
@ -137,63 +164,21 @@ void RotatedPatch_DoRotation(rotsprite_t *rotsprite, patch_t *patch, INT32 angle
return;
// Find the dimensions of the rotated patch.
RotatedPatch_CalculateDimensions(width, height, ca, sa, &newwidth, &newheight);
xcenter = (xpivot * FRACUNIT);
ycenter = (ypivot * FRACUNIT);
if (xpivot != width / 2 || ypivot != height / 2)
{
INT32 w1 = abs(FixedMul(width << FRACBITS, ca) - FixedMul(height << FRACBITS, sa));
INT32 w2 = abs(FixedMul(-(width << FRACBITS), ca) - FixedMul(height << FRACBITS, sa));
INT32 h1 = abs(FixedMul(width << FRACBITS, sa) + FixedMul(height << FRACBITS, ca));
INT32 h2 = abs(FixedMul(-(width << FRACBITS), sa) + FixedMul(height << FRACBITS, ca));
w1 = FixedInt(FixedCeil(w1 + (FRACUNIT/2)));
w2 = FixedInt(FixedCeil(w2 + (FRACUNIT/2)));
h1 = FixedInt(FixedCeil(h1 + (FRACUNIT/2)));
h2 = FixedInt(FixedCeil(h2 + (FRACUNIT/2)));
newwidth = max(width, max(w1, w2));
newheight = max(height, max(h1, h2));
newwidth *= 2;
newheight *= 2;
}
// check boundaries
{
fixed_t top[2][2];
fixed_t bottom[2][2];
top[0][0] = FixedMul((-ROTSPRITE_XCENTER) << FRACBITS, ca) + FixedMul((-ROTSPRITE_YCENTER) << FRACBITS, sa) + (xpivot << FRACBITS);
top[0][1] = FixedMul((-ROTSPRITE_XCENTER) << FRACBITS, sa) + FixedMul((-ROTSPRITE_YCENTER) << FRACBITS, ca) + (ypivot << FRACBITS);
top[1][0] = FixedMul((newwidth-ROTSPRITE_XCENTER) << FRACBITS, ca) + FixedMul((-ROTSPRITE_YCENTER) << FRACBITS, sa) + (xpivot << FRACBITS);
top[1][1] = FixedMul((newwidth-ROTSPRITE_XCENTER) << FRACBITS, sa) + FixedMul((-ROTSPRITE_YCENTER) << FRACBITS, ca) + (ypivot << FRACBITS);
bottom[0][0] = FixedMul((-ROTSPRITE_XCENTER) << FRACBITS, ca) + FixedMul((newheight-ROTSPRITE_YCENTER) << FRACBITS, sa) + (xpivot << FRACBITS);
bottom[0][1] = -FixedMul((-ROTSPRITE_XCENTER) << FRACBITS, sa) + FixedMul((newheight-ROTSPRITE_YCENTER) << FRACBITS, ca) + (ypivot << FRACBITS);
bottom[1][0] = FixedMul((newwidth-ROTSPRITE_XCENTER) << FRACBITS, ca) + FixedMul((newheight-ROTSPRITE_YCENTER) << FRACBITS, sa) + (xpivot << FRACBITS);
bottom[1][1] = -FixedMul((newwidth-ROTSPRITE_XCENTER) << FRACBITS, sa) + FixedMul((newheight-ROTSPRITE_YCENTER) << FRACBITS, ca) + (ypivot << FRACBITS);
top[0][0] >>= FRACBITS;
top[0][1] >>= FRACBITS;
top[1][0] >>= FRACBITS;
top[1][1] >>= FRACBITS;
bottom[0][0] >>= FRACBITS;
bottom[0][1] >>= FRACBITS;
bottom[1][0] >>= FRACBITS;
bottom[1][1] >>= FRACBITS;
#define BOUNDARYWCHECK(b) (b[0] < 0 || b[0] >= width)
#define BOUNDARYHCHECK(b) (b[1] < 0 || b[1] >= height)
#define BOUNDARYADJUST(x) x *= 2
// top left/right
if (BOUNDARYWCHECK(top[0]) || BOUNDARYWCHECK(top[1]))
BOUNDARYADJUST(newwidth);
// bottom left/right
else if (BOUNDARYWCHECK(bottom[0]) || BOUNDARYWCHECK(bottom[1]))
BOUNDARYADJUST(newwidth);
// top left/right
if (BOUNDARYHCHECK(top[0]) || BOUNDARYHCHECK(top[1]))
BOUNDARYADJUST(newheight);
// bottom left/right
else if (BOUNDARYHCHECK(bottom[0]) || BOUNDARYHCHECK(bottom[1]))
BOUNDARYADJUST(newheight);
#undef BOUNDARYWCHECK
#undef BOUNDARYHCHECK
#undef BOUNDARYADJUST
}
minx = newwidth;
miny = newheight;
maxx = 0;
maxy = 0;
// Draw the rotated sprite to a temporary buffer.
size = (newwidth * newheight);
@ -205,37 +190,76 @@ void RotatedPatch_DoRotation(rotsprite_t *rotsprite, patch_t *patch, INT32 angle
{
for (dx = 0; dx < newwidth; dx++)
{
INT32 x = (dx-ROTSPRITE_XCENTER) << FRACBITS;
INT32 y = (dy-ROTSPRITE_YCENTER) << FRACBITS;
INT32 sx = FixedMul(x, ca) + FixedMul(y, sa) + (xpivot << FRACBITS);
INT32 sy = -FixedMul(x, sa) + FixedMul(y, ca) + (ypivot << FRACBITS);
x = (dx - (newwidth / 2)) * FRACUNIT;
y = (dy - (newheight / 2)) * FRACUNIT;
sx = FixedMul(x, ca) + FixedMul(y, sa) + xcenter;
sy = -FixedMul(x, sa) + FixedMul(y, ca) + ycenter;
sx >>= FRACBITS;
sy >>= FRACBITS;
if (sx >= 0 && sy >= 0 && sx < width && sy < height)
{
void *input = Picture_GetPatchPixel(patch, PICFMT_PATCH, sx, sy, bflip);
if (input != NULL)
rawdst[(dy*newwidth)+dx] = (0xFF00 | (*(UINT8 *)input));
{
rawdst[(dy * newwidth) + dx] = (0xFF00 | (*(UINT8 *)input));
if (dx < minx)
minx = dx;
if (dy < miny)
miny = dy;
if (dx > maxx)
maxx = dx;
if (dy > maxy)
maxy = dy;
}
}
}
}
ox = (newwidth / 2) + (leftoffset - xpivot);
oy = (newheight / 2) + (patch->topoffset - ypivot);
width = (maxx - minx);
height = (maxy - miny);
if ((unsigned)(width * height) != size)
{
UINT16 *src, *dest;
size = (width * height);
rawconv = Z_Calloc(size * sizeof(UINT16), PU_STATIC, NULL);
src = &rawdst[(miny * newwidth) + minx];
dest = rawconv;
dy = height;
while (dy--)
{
M_Memcpy(dest, src, width * sizeof(UINT16));
dest += width;
src += newwidth;
}
ox -= minx;
oy -= miny;
Z_Free(rawdst);
}
else
{
rawconv = rawdst;
width = newwidth;
height = newheight;
}
// make patch
rotated = (patch_t *)Picture_Convert(PICFMT_FLAT16, rawdst, PICFMT_PATCH, 0, &size, newwidth, newheight, 0, 0, 0);
rotated = (patch_t *)Picture_Convert(PICFMT_FLAT16, rawconv, PICFMT_PATCH, 0, NULL, width, height, 0, 0, 0);
Z_ChangeTag(rotated, PU_PATCH_ROTATED);
Z_SetUser(rotated, (void **)(&rotsprite->patches[idx]));
Z_Free(rawconv);
rotated->leftoffset = (rotated->width / 2) + (leftoffset - xpivot);
rotated->topoffset = (rotated->height / 2) + (patch->topoffset - ypivot);
//BP: we cannot use special tric in hardware mode because feet in ground caused by z-buffer
rotated->topoffset += FEETADJUST>>FRACBITS;
// free rotated image data
Z_Free(rawdst);
#undef ROTSPRITE_XCENTER
#undef ROTSPRITE_YCENTER
rotated->leftoffset = ox;
rotated->topoffset = oy;
}
#endif