ref: 781eeead92f56bd399624c6f3edc0568935cf9b1
dir: /d_edge.c/
#include "quakedef.h"
static int miplevel;
float scale_for_mip;
// FIXME: should go away
extern void R_RotateBmodel (void);
extern void R_TransformFrustum (void);
static 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;
return max(d_minmip, lmiplevel);
}
// FIXME: clean this up
static void
D_DrawSolidSurface(surf_t *surf, pixel_t color)
{
espan_t *span;
pixel_t *pdest;
int u, u2;
for(span = surf->spans; span; span=span->pnext){
pdest = d_viewbuffer + screenwidth*span->v;
u2 = span->u + span->count - 1;
for(u = span->u; u <= u2; u++)
pdest[u] = color;
}
}
static void
D_CalcGradients(msurface_t *pface, vec3_t transformed_modelorg)
{
float mipscale;
vec3_t p_temp1, p_saxis, p_taxis;
float t;
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;
}
void
D_DrawSurfaces (void)
{
surf_t *s;
msurface_t *pface;
surfcache_t *pcurrentcache;
vec3_t world_transformed_modelorg, local_modelorg, transformed_modelorg;
byte alpha;
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
for(s = &surfaces[1]; s < surface_p; s++){
if (!s->spans)
continue;
if((surfdrawflags(s->flags) | entdrawflags(s->entity)) ^ r_drawflags)
continue;
alpha = 255;
if(enthasalpha(s->entity) && s->entity->alpha != 255)
alpha = s->entity->alpha;
else if(s->flags & SURF_TRANS)
alpha *= alphafor(s->flags);
if(alpha < 1)
alpha = 255;
d_zistepu = s->d_zistepu;
d_zistepv = s->d_zistepv;
d_ziorigin = s->d_ziorigin;
if(s->flags & SURF_DRAWSKY){
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, q1pal[(int)r_clearcolor.value & 0xFF]);
D_DrawZSpans(s->spans);
}else if(s->flags & SURF_DRAWTURB){
pface = s->data;
miplevel = 0;
cacheblock = pface->texinfo->texture->pixels + 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, transformed_modelorg);
Turbulent8 (s->spans, alpha);
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;
if(s->flags & SURF_FENCE)
miplevel = 0;
else
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 = pcurrentcache->pixels;
cachewidth = pcurrentcache->width;
D_CalcGradients(pface, transformed_modelorg);
D_DrawSpans16(s->spans, s->flags & SURF_FENCE, alpha);
if((r_drawflags & DRAW_BLEND) == 0)
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();
}
}
}
}