in doom_py/src/vizdoom/src/r_things.cpp [659:1066]
void R_ProjectSprite (AActor *thing, int fakeside, F3DFloor *fakefloor, F3DFloor *fakeceiling)
{
fixed_t fx, fy, fz;
fixed_t tr_x;
fixed_t tr_y;
fixed_t gzt; // killough 3/27/98
fixed_t gzb; // [RH] use bottom of sprite, not actor
fixed_t tx, tx2;
fixed_t tz;
fixed_t xscale = FRACUNIT, yscale = FRACUNIT;
int x1;
int x2;
FTextureID picnum;
FTexture *tex;
FVoxelDef *voxel;
vissprite_t* vis;
fixed_t iscale;
sector_t* heightsec; // killough 3/27/98
// Don't waste time projecting sprites that are definitely not visible.
if (thing == NULL ||
(thing->renderflags & RF_INVISIBLE) ||
!thing->RenderStyle.IsVisible(thing->alpha) ||
!thing->IsVisibleToPlayer())
{
return;
}
// [RH] Interpolate the sprite's position to make it look smooth
fixedvec3 pos = thing->InterpolatedPosition(r_TicFrac);
fx = pos.x;
fy = pos.y;
fz = pos.z + thing->GetBobOffset(r_TicFrac);
tex = NULL;
voxel = NULL;
int spritenum = thing->sprite;
fixed_t spritescaleX = thing->scaleX;
fixed_t spritescaleY = thing->scaleY;
int renderflags = thing->renderflags;
if (spritescaleY < 0)
{
spritescaleY = -spritescaleY;
renderflags ^= RF_YFLIP;
}
if (thing->player != NULL)
{
P_CheckPlayerSprite(thing, spritenum, spritescaleX, spritescaleY);
}
if (thing->picnum.isValid())
{
picnum = thing->picnum;
tex = TexMan(picnum);
if (tex->UseType == FTexture::TEX_Null)
{
return;
}
if (tex->Rotations != 0xFFFF)
{
// choose a different rotation based on player view
spriteframe_t *sprframe = &SpriteFrames[tex->Rotations];
angle_t ang = R_PointToAngle (fx, fy);
angle_t rot;
if (sprframe->Texture[0] == sprframe->Texture[1])
{
rot = (ang - thing->angle + (angle_t)(ANGLE_45/2)*9) >> 28;
}
else
{
rot = (ang - thing->angle + (angle_t)(ANGLE_45/2)*9-(angle_t)(ANGLE_180/16)) >> 28;
}
picnum = sprframe->Texture[rot];
if (sprframe->Flip & (1 << rot))
{
renderflags ^= RF_XFLIP;
}
tex = TexMan[picnum]; // Do not animate the rotation
}
}
else
{
// decide which texture to use for the sprite
#ifdef RANGECHECK
if (spritenum >= (signed)sprites.Size () || spritenum < 0)
{
DPrintf ("R_ProjectSprite: invalid sprite number %u\n", spritenum);
return;
}
#endif
spritedef_t *sprdef = &sprites[spritenum];
if (thing->frame >= sprdef->numframes)
{
// If there are no frames at all for this sprite, don't draw it.
return;
}
else
{
//picnum = SpriteFrames[sprdef->spriteframes + thing->frame].Texture[0];
// choose a different rotation based on player view
spriteframe_t *sprframe = &SpriteFrames[sprdef->spriteframes + thing->frame];
angle_t ang = R_PointToAngle (fx, fy);
angle_t rot;
if (sprframe->Texture[0] == sprframe->Texture[1])
{
rot = (ang - thing->angle + (angle_t)(ANGLE_45/2)*9) >> 28;
}
else
{
rot = (ang - thing->angle + (angle_t)(ANGLE_45/2)*9-(angle_t)(ANGLE_180/16)) >> 28;
}
picnum = sprframe->Texture[rot];
if (sprframe->Flip & (1 << rot))
{
renderflags ^= RF_XFLIP;
}
tex = TexMan[picnum]; // Do not animate the rotation
if (r_drawvoxels)
{
voxel = sprframe->Voxel;
}
}
}
if (spritescaleX < 0)
{
spritescaleX = -spritescaleX;
renderflags ^= RF_XFLIP;
}
if (voxel == NULL && (tex == NULL || tex->UseType == FTexture::TEX_Null))
{
return;
}
if ((renderflags & RF_SPRITETYPEMASK) == RF_WALLSPRITE)
{
R_ProjectWallSprite(thing, fx, fy, fz, picnum, spritescaleX, spritescaleY, renderflags);
return;
}
// transform the origin point
tr_x = fx - viewx;
tr_y = fy - viewy;
tz = DMulScale20 (tr_x, viewtancos, tr_y, viewtansin);
// thing is behind view plane?
if (voxel == NULL && tz < MINZ)
return;
tx = DMulScale16 (tr_x, viewsin, -tr_y, viewcos);
// [RH] Flip for mirrors
if (MirrorFlags & RF_XFLIP)
{
tx = -tx;
}
tx2 = tx >> 4;
// too far off the side?
// if it's a voxel, it can be further off the side
if ((voxel == NULL && (abs(tx) >> 6) > abs(tz)) ||
(voxel != NULL && (abs(tx) >> 7) > abs(tz)))
{
return;
}
if (voxel == NULL)
{
// [RH] Added scaling
int scaled_to = tex->GetScaledTopOffset();
int scaled_bo = scaled_to - tex->GetScaledHeight();
gzt = fz + spritescaleY * scaled_to;
gzb = fz + spritescaleY * scaled_bo;
}
else
{
xscale = FixedMul(spritescaleX, voxel->Scale);
yscale = FixedMul(spritescaleY, voxel->Scale);
gzt = fz + MulScale8(yscale, voxel->Voxel->Mips[0].PivotZ) - thing->floorclip;
gzb = fz + MulScale8(yscale, voxel->Voxel->Mips[0].PivotZ - (voxel->Voxel->Mips[0].SizeZ << 8));
if (gzt <= gzb)
return;
}
// killough 3/27/98: exclude things totally separated
// from the viewer, by either water or fake ceilings
// killough 4/11/98: improve sprite clipping for underwater/fake ceilings
heightsec = thing->Sector->GetHeightSec();
if (heightsec != NULL) // only clip things which are in special sectors
{
if (fakeside == FAKED_AboveCeiling)
{
if (gzt < heightsec->ceilingplane.ZatPoint (fx, fy))
return;
}
else if (fakeside == FAKED_BelowFloor)
{
if (gzb >= heightsec->floorplane.ZatPoint (fx, fy))
return;
}
else
{
if (gzt < heightsec->floorplane.ZatPoint (fx, fy))
return;
if (!(heightsec->MoreFlags & SECF_FAKEFLOORONLY) && gzb >= heightsec->ceilingplane.ZatPoint (fx, fy))
return;
}
}
if (voxel == NULL)
{
xscale = DivScale12 (centerxfrac, tz);
// [RH] Reject sprites that are off the top or bottom of the screen
if (MulScale12 (globaluclip, tz) > viewz - gzb ||
MulScale12 (globaldclip, tz) < viewz - gzt)
{
return;
}
// [RH] Flip for mirrors
renderflags ^= MirrorFlags & RF_XFLIP;
// calculate edges of the shape
const fixed_t thingxscalemul = DivScale16(spritescaleX, tex->xScale);
tx -= ((renderflags & RF_XFLIP) ? (tex->GetWidth() - tex->LeftOffset - 1) : tex->LeftOffset) * thingxscalemul;
x1 = centerx + MulScale32 (tx, xscale);
// off the right side?
if (x1 >= WindowRight)
return;
tx += tex->GetWidth() * thingxscalemul;
x2 = centerx + MulScale32 (tx, xscale);
// off the left side or too small?
if ((x2 < WindowLeft || x2 <= x1))
return;
xscale = FixedDiv(FixedMul(spritescaleX, xscale), tex->xScale);
iscale = (tex->GetWidth() << FRACBITS) / (x2 - x1);
fixed_t yscale = SafeDivScale16(spritescaleY, tex->yScale);
// store information in a vissprite
vis = R_NewVisSprite();
vis->xscale = xscale;
vis->yscale = Scale(InvZtoScale, yscale, tz << 4);
vis->idepth = (unsigned)DivScale32(1, tz) >> 1; // tz is 20.12, so idepth ought to be 12.20, but signed math makes it 13.19
vis->floorclip = FixedDiv (thing->floorclip, yscale);
vis->texturemid = (tex->TopOffset << FRACBITS) - FixedDiv (viewz - fz + thing->floorclip, yscale);
vis->x1 = x1 < WindowLeft ? WindowLeft : x1;
vis->x2 = x2 > WindowRight ? WindowRight : x2;
vis->angle = thing->angle;
if (renderflags & RF_XFLIP)
{
vis->startfrac = (tex->GetWidth() << FRACBITS) - 1;
vis->xiscale = -iscale;
}
else
{
vis->startfrac = 0;
vis->xiscale = iscale;
}
if (vis->x1 > x1)
vis->startfrac += vis->xiscale * (vis->x1 - x1);
}
else
{
vis = R_NewVisSprite();
vis->xscale = xscale;
vis->yscale = yscale;
vis->x1 = WindowLeft;
vis->x2 = WindowRight;
vis->idepth = (unsigned)DivScale32(1, MAX(tz, MINZ)) >> 1;
vis->floorclip = thing->floorclip;
fz -= thing->floorclip;
vis->angle = thing->angle + voxel->AngleOffset;
int voxelspin = (thing->flags & MF_DROPPED) ? voxel->DroppedSpin : voxel->PlacedSpin;
if (voxelspin != 0)
{
double ang = double(I_FPSTime()) * voxelspin / 1000;
vis->angle -= angle_t(ang * (4294967296.f / 360));
}
vis->vx = viewx;
vis->vy = viewy;
vis->vz = viewz;
vis->vang = viewangle;
}
// killough 3/27/98: save sector for special clipping later
vis->heightsec = heightsec;
vis->sector = thing->Sector;
vis->depth = tz;
vis->gx = fx;
vis->gy = fy;
vis->gz = fz;
vis->gzb = gzb; // [RH] use gzb, not thing->z
vis->gzt = gzt; // killough 3/27/98
vis->deltax = fx - viewx;
vis->deltay = fy - viewy;
vis->renderflags = renderflags;
if(thing->flags5 & MF5_BRIGHT) vis->renderflags |= RF_FULLBRIGHT; // kg3D
vis->Style.RenderStyle = thing->RenderStyle;
vis->FillColor = thing->fillcolor;
vis->Translation = thing->Translation; // [RH] thing translation table
vis->FakeFlatStat = fakeside;
vis->Style.alpha = thing->alpha;
vis->fakefloor = fakefloor;
vis->fakeceiling = fakeceiling;
vis->ColormapNum = 0;
vis->bInMirror = MirrorFlags & RF_XFLIP;
vis->bSplitSprite = false;
if (voxel != NULL)
{
vis->voxel = voxel->Voxel;
vis->bIsVoxel = true;
vis->bWallSprite = false;
DrewAVoxel = true;
}
else
{
vis->pic = tex;
vis->bIsVoxel = false;
vis->bWallSprite = false;
}
// The software renderer cannot invert the source without inverting the overlay
// too. That means if the source is inverted, we need to do the reverse of what
// the invert overlay flag says to do.
INTBOOL invertcolormap = (vis->Style.RenderStyle.Flags & STYLEF_InvertOverlay);
if (vis->Style.RenderStyle.Flags & STYLEF_InvertSource)
{
invertcolormap = !invertcolormap;
}
FDynamicColormap *mybasecolormap = basecolormap;
// Sprites that are added to the scene must fade to black.
if (vis->Style.RenderStyle == LegacyRenderStyles[STYLE_Add] && mybasecolormap->Fade != 0)
{
mybasecolormap = GetSpecialLights(mybasecolormap->Color, 0, mybasecolormap->Desaturate);
}
if (vis->Style.RenderStyle.Flags & STYLEF_FadeToBlack)
{
if (invertcolormap)
{ // Fade to white
mybasecolormap = GetSpecialLights(mybasecolormap->Color, MAKERGB(255,255,255), mybasecolormap->Desaturate);
invertcolormap = false;
}
else
{ // Fade to black
mybasecolormap = GetSpecialLights(mybasecolormap->Color, MAKERGB(0,0,0), mybasecolormap->Desaturate);
}
}
// get light level
if (fixedcolormap != NULL)
{ // fixed map
vis->Style.colormap = fixedcolormap;
}
else
{
if (invertcolormap)
{
mybasecolormap = GetSpecialLights(mybasecolormap->Color, mybasecolormap->Fade.InverseColor(), mybasecolormap->Desaturate);
}
if (fixedlightlev >= 0)
{
vis->Style.colormap = mybasecolormap->Maps + fixedlightlev;
}
else if (!foggy && ((renderflags & RF_FULLBRIGHT) || (thing->flags5 & MF5_BRIGHT)))
{ // full bright
vis->Style.colormap = mybasecolormap->Maps;
}
else
{ // diminished light
vis->ColormapNum = GETPALOOKUP(
(fixed_t)DivScale12 (r_SpriteVisibility, MAX(tz, MINZ)), spriteshade);
vis->Style.colormap = mybasecolormap->Maps + (vis->ColormapNum << COLORMAPSHIFT);
}
}
}