ref: 8723be0d01ab4150ed6ca63649a6ec1ddcc06efb
dir: /d_edge.c/
/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// d_edge.c
#include "quakedef.h"
#include "d_local.h"
static int miplevel;
float scale_for_mip;
int screenwidth;
int ubasestep, errorterm, erroradjustup, erroradjustdown;
int vstartscan;
// FIXME: should go away
extern void R_RotateBmodel (void);
extern void R_TransformFrustum (void);
vec3_t transformed_modelorg;
/*
==============
D_DrawPoly
==============
*/
void D_DrawPoly (void)
{
// this driver takes spans, not polygons
}
/*
=============
D_MipLevelForScale
=============
*/
int D_MipLevelForScale (float scale)
{
int lmiplevel;
if (scale >= d_scalemip[0] )
lmiplevel = 0;
else if (scale >= d_scalemip[1] )
lmiplevel = 1;
else if (scale >= d_scalemip[2] )
lmiplevel = 2;
else
lmiplevel = 3;
if (lmiplevel < d_minmip)
lmiplevel = d_minmip;
return lmiplevel;
}
/*
==============
D_DrawSolidSurface
==============
*/
// FIXME: clean this up
void D_DrawSolidSurface (surf_t *surf, int color)
{
espan_t *span;
byte *pdest;
int u, u2, pix;
pix = (color<<24) | (color<<16) | (color<<8) | color;
for (span=surf->spans ; span ; span=span->pnext)
{
pdest = (byte *)d_viewbuffer + screenwidth*span->v;
u = span->u;
u2 = span->u + span->count - 1;
((byte *)pdest)[u] = pix;
if (u2 - u < 8)
{
for (u++ ; u <= u2 ; u++)
((byte *)pdest)[u] = pix;
}
else
{
for (u++ ; u & 3 ; u++)
((byte *)pdest)[u] = pix;
u2 -= 4;
for ( ; u <= u2 ; u+=4)
*(int *)((byte *)pdest + u) = pix;
u2 += 4;
for ( ; u <= u2 ; u++)
((byte *)pdest)[u] = pix;
}
}
}
/*
==============
D_CalcGradients
==============
*/
void D_CalcGradients (msurface_t *pface)
{
mplane_t *pplane;
float mipscale;
vec3_t p_temp1;
vec3_t p_saxis, p_taxis;
float t;
pplane = pface->plane;
mipscale = 1.0 / (float)(1 << miplevel);
TransformVector (pface->texinfo->vecs[0], p_saxis);
TransformVector (pface->texinfo->vecs[1], p_taxis);
t = xscaleinv * mipscale;
d_sdivzstepu = p_saxis[0] * t;
d_tdivzstepu = p_taxis[0] * t;
t = yscaleinv * mipscale;
d_sdivzstepv = -p_saxis[1] * t;
d_tdivzstepv = -p_taxis[1] * t;
d_sdivzorigin = p_saxis[2] * mipscale - xcenter * d_sdivzstepu -
ycenter * d_sdivzstepv;
d_tdivzorigin = p_taxis[2] * mipscale - xcenter * d_tdivzstepu -
ycenter * d_tdivzstepv;
VectorScale (transformed_modelorg, mipscale, p_temp1);
t = 0x10000*mipscale;
sadjust = ((fixed16_t)(DotProduct (p_temp1, p_saxis) * 0x10000 + 0.5)) -
((pface->texturemins[0] << 16) >> miplevel)
+ pface->texinfo->vecs[0][3]*t;
tadjust = ((fixed16_t)(DotProduct (p_temp1, p_taxis) * 0x10000 + 0.5)) -
((pface->texturemins[1] << 16) >> miplevel)
+ pface->texinfo->vecs[1][3]*t;
//
// -1 (-epsilon) so we never wander off the edge of the texture
//
bbextents = ((pface->extents[0] << 16) >> miplevel) - 1;
bbextentt = ((pface->extents[1] << 16) >> miplevel) - 1;
}
/*
==============
D_DrawSurfaces
==============
*/
void D_DrawSurfaces (void)
{
surf_t *s;
msurface_t *pface;
surfcache_t *pcurrentcache;
vec3_t world_transformed_modelorg;
vec3_t local_modelorg;
currententity = &cl_entities[0];
TransformVector (modelorg, transformed_modelorg);
VectorCopy (transformed_modelorg, world_transformed_modelorg);
// TODO: could preset a lot of this at mode set time
if (r_drawflat.value)
{
for (s = &surfaces[1] ; s<surface_p ; s++)
{
if (!s->spans)
continue;
d_zistepu = s->d_zistepu;
d_zistepv = s->d_zistepv;
d_ziorigin = s->d_ziorigin;
D_DrawSolidSurface (s, (int)s->data & 0xFF);
D_DrawZSpans (s->spans);
}
}
else
{
for (s = &surfaces[1] ; s<surface_p ; s++)
{
if (!s->spans)
continue;
r_drawnpolycount++;
d_zistepu = s->d_zistepu;
d_zistepv = s->d_zistepv;
d_ziorigin = s->d_ziorigin;
if (s->flags & SURF_DRAWSKY)
{
if (!r_skymade)
{
R_MakeSky ();
}
D_DrawSkyScans8 (s->spans);
D_DrawZSpans (s->spans);
}
else if (s->flags & SURF_DRAWBACKGROUND)
{
// set up a gradient for the background surface that places it
// effectively at infinity distance from the viewpoint
d_zistepu = 0;
d_zistepv = 0;
d_ziorigin = -0.9;
D_DrawSolidSurface (s, (int)r_clearcolor.value & 0xFF);
D_DrawZSpans (s->spans);
}
else if (s->flags & SURF_DRAWTURB)
{
pface = s->data;
miplevel = 0;
cacheblock = (pixel_t *)
((byte *)pface->texinfo->texture +
pface->texinfo->texture->offsets[0]);
cachewidth = 64;
if (s->insubmodel)
{
// FIXME: we don't want to do all this for every polygon!
// TODO: store once at start of frame
currententity = s->entity; //FIXME: make this passed in to
// R_RotateBmodel ()
VectorSubtract (r_origin, currententity->origin,
local_modelorg);
TransformVector (local_modelorg, transformed_modelorg);
R_RotateBmodel (); // FIXME: don't mess with the frustum,
// make entity passed in
}
D_CalcGradients (pface);
Turbulent8 (s->spans);
D_DrawZSpans (s->spans);
if (s->insubmodel)
{
//
// restore the old drawing state
// FIXME: we don't want to do this every time!
// TODO: speed up
//
currententity = &cl_entities[0];
VectorCopy (world_transformed_modelorg,
transformed_modelorg);
VectorCopy (base_vpn, vpn);
VectorCopy (base_vup, vup);
VectorCopy (base_vright, vright);
VectorCopy (base_modelorg, modelorg);
R_TransformFrustum ();
}
}
else
{
if (s->insubmodel)
{
// FIXME: we don't want to do all this for every polygon!
// TODO: store once at start of frame
currententity = s->entity; //FIXME: make this passed in to
// R_RotateBmodel ()
VectorSubtract (r_origin, currententity->origin, local_modelorg);
TransformVector (local_modelorg, transformed_modelorg);
R_RotateBmodel (); // FIXME: don't mess with the frustum,
// make entity passed in
}
pface = s->data;
miplevel = D_MipLevelForScale (s->nearzi * scale_for_mip
* pface->texinfo->mipadjust);
// FIXME: make this passed in to D_CacheSurface
pcurrentcache = D_CacheSurface (pface, miplevel);
cacheblock = (pixel_t *)pcurrentcache->data;
cachewidth = pcurrentcache->width;
D_CalcGradients (pface);
(*d_drawspans) (s->spans);
D_DrawZSpans (s->spans);
if (s->insubmodel)
{
//
// restore the old drawing state
// FIXME: we don't want to do this every time!
// TODO: speed up
//
currententity = &cl_entities[0];
VectorCopy (world_transformed_modelorg,
transformed_modelorg);
VectorCopy (base_vpn, vpn);
VectorCopy (base_vup, vup);
VectorCopy (base_vright, vright);
VectorCopy (base_modelorg, modelorg);
R_TransformFrustum ();
}
}
}
}
}