ref: 955a62fe39dcc3c475e6a44d50e9f3f62a7b05aa
dir: /r_surf.c/
#include "quakedef.h"
/*
===============
R_AddDynamicLights
===============
*/
static void
R_AddDynamicLights(entity_t *e, drawsurf_t *ds)
{
msurface_t *ms;
int lnum;
int sd, td;
float dist, rad, minlight;
vec3_t impact, local, entorigin;
int s, t;
int i;
int smax, tmax;
mtexinfo_t *tex;
ms = ds->m;
smax = (ms->extents[0]>>4)+1;
tmax = (ms->extents[1]>>4)+1;
tex = ms->texinfo;
for(lnum = 0; lnum < MAX_DLIGHTS; lnum++){
if((ms->dlightbits & (1<<lnum)) == 0)
continue; // not lit by this light
rad = cl_dlights[lnum].radius;
VectorSubtract(cl_dlights[lnum].origin, e->origin, entorigin);
dist = DotProduct(entorigin, ms->plane->normal) - ms->plane->dist;
rad -= fabs(dist);
minlight = cl_dlights[lnum].minlight;
if(rad < minlight)
continue;
minlight = rad - minlight;
for(i = 0; i < 3; i++)
impact[i] = entorigin[i] - ms->plane->normal[i]*dist;
local[0] = DotProduct(impact, tex->vecs[0]) + tex->vecs[0][3];
local[1] = DotProduct(impact, tex->vecs[1]) + tex->vecs[1][3];
local[0] -= ms->texturemins[0];
local[1] -= ms->texturemins[1];
for(t = 0; t < tmax; t++){
td = local[1] - t*16;
if(td < 0)
td = -td;
for(s = 0; s < smax ; s++){
sd = local[0] - s*16;
if(sd < 0)
sd = -sd;
if(sd > td)
dist = sd + (td>>1);
else
dist = td + (sd>>1);
if(dist < minlight){
ds->blocklights[0][t*smax + s] += (rad - dist)*256;
ds->blocklights[1][t*smax + s] += (rad - dist)*256;
ds->blocklights[2][t*smax + s] += (rad - dist)*256;
}
}
}
}
}
/*
===============
R_BuildLightMap
Combine and scale multiple lightmaps into the 8.8 format in blocklights
===============
*/
static void
R_BuildLightMap(entity_t *e, drawsurf_t *ds)
{
int smax, tmax;
int t;
int i, size;
byte *lightmap;
unsigned scale;
int maps;
msurface_t *ms;
ms = ds->m;
smax = (ms->extents[0]>>4)+1;
tmax = (ms->extents[1]>>4)+1;
size = smax*tmax;
lightmap = ms->samples;
if(r_fullbright.value || !cl.worldmodel->lightdata){
memset(ds->blocklights, 0, sizeof(ds->blocklights));
return;
}
// clear to ambient
for(i = 0; i < size; i++){
ds->blocklights[0][i] = r_refdef.ambientlight[0]<<8;
ds->blocklights[1][i] = r_refdef.ambientlight[1]<<8;
ds->blocklights[2][i] = r_refdef.ambientlight[2]<<8;
}
// add all the lightmaps
if(lightmap){
for(maps = 0; maps < MAXLIGHTMAPS && ms->styles[maps] != 255; maps++){
scale = ds->lightadj[maps]; // 8.8 fraction
for(i = 0; i < size; i++){
ds->blocklights[0][i] += lightmap[i*3+0] * scale;
ds->blocklights[1][i] += lightmap[i*3+1] * scale;
ds->blocklights[2][i] += lightmap[i*3+2] * scale;
}
lightmap += size * 3; // skip to next lightmap
}
}
// add all the dynamic lights
if(ms->dlightframe == r_framecount)
R_AddDynamicLights(e, ds);
// bound, invert, and shift
for(i = 0; i < size; i++){
t = (255*256 - (int)ds->blocklights[0][i]) >> (8 - VID_CBITS);
ds->blocklights[0][i] = max(t, (1<<6));
t = (255*256 - (int)ds->blocklights[1][i]) >> (8 - VID_CBITS);
ds->blocklights[1][i] = max(t, (1<<6));
t = (255*256 - (int)ds->blocklights[2][i]) >> (8 - VID_CBITS);
ds->blocklights[2][i] = max(t, (1<<6));
}
}
/*
===============
R_TextureAnimation
Returns the proper texture for a given time and base texture
===============
*/
texture_t *
R_TextureAnimation(entity_t *e, texture_t *base)
{
int relative, count;
if(e->frame && base->alternate_anims)
base = base->alternate_anims;
if(!base->anim_total)
return base;
relative = (int)(cl.time*10) % base->anim_total;
count = 0;
while(base->anim_min > relative || base->anim_max <= relative){
base = base->anim_next;
if(!base)
fatal("R_TextureAnimation: broken cycle");
if(++count > 100)
fatal("R_TextureAnimation: infinite cycle");
}
return base;
}
#define fullbright 1
#define additive 1
#define addlight addlight_f1_a1
#define DrawSurfaceBlock_m0 DrawSurfaceBlock_f1_a1_m0
#define DrawSurfaceBlock_m1 DrawSurfaceBlock_f1_a1_m1
#define DrawSurfaceBlock_m2 DrawSurfaceBlock_f1_a1_m2
#define DrawSurfaceBlock_m3 DrawSurfaceBlock_f1_a1_m3
#include "r_surf_x.h"
#undef fullbright
#undef additive
#undef addlight
#undef DrawSurfaceBlock_m0
#undef DrawSurfaceBlock_m1
#undef DrawSurfaceBlock_m2
#undef DrawSurfaceBlock_m3
#define fullbright 0
#define additive 1
#define addlight addlight_f0_a1
#define DrawSurfaceBlock_m0 DrawSurfaceBlock_f0_a1_m0
#define DrawSurfaceBlock_m1 DrawSurfaceBlock_f0_a1_m1
#define DrawSurfaceBlock_m2 DrawSurfaceBlock_f0_a1_m2
#define DrawSurfaceBlock_m3 DrawSurfaceBlock_f0_a1_m3
#include "r_surf_x.h"
#undef fullbright
#undef additive
#undef addlight
#undef DrawSurfaceBlock_m0
#undef DrawSurfaceBlock_m1
#undef DrawSurfaceBlock_m2
#undef DrawSurfaceBlock_m3
#define fullbright 1
#define additive 0
#define addlight addlight_f1_a0
#define DrawSurfaceBlock_m0 DrawSurfaceBlock_f1_a0_m0
#define DrawSurfaceBlock_m1 DrawSurfaceBlock_f1_a0_m1
#define DrawSurfaceBlock_m2 DrawSurfaceBlock_f1_a0_m2
#define DrawSurfaceBlock_m3 DrawSurfaceBlock_f1_a0_m3
#include "r_surf_x.h"
#undef fullbright
#undef additive
#undef addlight
#undef DrawSurfaceBlock_m0
#undef DrawSurfaceBlock_m1
#undef DrawSurfaceBlock_m2
#undef DrawSurfaceBlock_m3
#define fullbright 0
#define additive 0
#define addlight addlight_f0_a0
#define DrawSurfaceBlock_m0 DrawSurfaceBlock_f0_a0_m0
#define DrawSurfaceBlock_m1 DrawSurfaceBlock_f0_a0_m1
#define DrawSurfaceBlock_m2 DrawSurfaceBlock_f0_a0_m2
#define DrawSurfaceBlock_m3 DrawSurfaceBlock_f0_a0_m3
#include "r_surf_x.h"
#undef fullbright
#undef additive
#undef addlight
#undef DrawSurfaceBlock_m0
#undef DrawSurfaceBlock_m1
#undef DrawSurfaceBlock_m2
#undef DrawSurfaceBlock_m3
typedef void (*drawfunc)(pixel_t *psource, pixel_t *prowdest, pixel_t *sourcemax, int deststep, int tstep, int stepback, unsigned *lp[4], unsigned lw, int nb);
static const drawfunc drawsurf[2/*fullbright*/][2/*additive*/][4/*mipmap*/] = {
{
{
DrawSurfaceBlock_f0_a0_m0, DrawSurfaceBlock_f0_a0_m1,
DrawSurfaceBlock_f0_a0_m2, DrawSurfaceBlock_f0_a0_m3,
},
{
DrawSurfaceBlock_f0_a1_m0, DrawSurfaceBlock_f0_a1_m1,
DrawSurfaceBlock_f0_a1_m2, DrawSurfaceBlock_f0_a1_m3,
},
},
{
{
DrawSurfaceBlock_f1_a0_m0, DrawSurfaceBlock_f1_a0_m1,
DrawSurfaceBlock_f1_a0_m2, DrawSurfaceBlock_f1_a0_m3,
},
{
DrawSurfaceBlock_f1_a1_m0, DrawSurfaceBlock_f1_a1_m1,
DrawSurfaceBlock_f1_a1_m2, DrawSurfaceBlock_f1_a1_m3,
},
},
};
/*
===============
R_DrawSurface
===============
*/
void
R_DrawSurface(entity_t *e, drawsurf_t *ds)
{
pixel_t *basetptr;
int smax, tmax, twidth, lightwidth;
int u, blockdivshift, blocksize;
int soffset, basetoffset, texwidth;
int horzblockstep;
int r_numhblocks, r_numvblocks;
pixel_t *pcolumndest;
texture_t *mt;
msurface_t *ms;
drawfunc draw;
unsigned *lp[3];
int sourcetstep, stepback;
pixel_t *source, *sourcemax;
// calculate the lightings
R_BuildLightMap(e, ds);
mt = ds->texture;
ms = ds->m;
draw = drawsurf[mt->drawsurf][e != nil && (e->effects & EF_ADDITIVE) != 0][ds->mip];
source = mt->pixels + mt->offsets[ds->mip];
// the fractional light values should range from 0 to (VID_GRADES - 1) << 16
// from a source range of 0 - 255
texwidth = mt->width >> ds->mip;
blocksize = 16 >> ds->mip;
blockdivshift = 4 - ds->mip;
lightwidth = (ms->extents[0]>>4)+1;
r_numhblocks = ds->width >> blockdivshift;
r_numvblocks = ds->height >> blockdivshift;
// TODO: only needs to be set when there is a display settings change
horzblockstep = blocksize;
smax = mt->width >> ds->mip;
twidth = texwidth;
tmax = mt->height >> ds->mip;
sourcetstep = texwidth;
stepback = tmax * twidth;
sourcemax = source + (tmax * smax);
soffset = ms->texturemins[0];
basetoffset = ms->texturemins[1];
// << 16 components are to guarantee positive values for %
soffset = ((soffset >> ds->mip) + (smax << 16)) % smax;
basetptr = &source[((((basetoffset >> ds->mip) + (tmax << 16)) % tmax) * twidth)];
for(u = 0, pcolumndest = ds->dat; u < r_numhblocks; u++, pcolumndest += horzblockstep){
lp[0] = ds->blocklights[0]+u;
lp[1] = ds->blocklights[1]+u;
lp[2] = ds->blocklights[2]+u;
draw(
pcolumndest,
basetptr+soffset, sourcemax,
ds->width, sourcetstep, stepback,
lp, lightwidth, r_numvblocks
);
soffset = soffset + blocksize;
if(soffset >= smax)
soffset = 0;
}
}
pixel_t
addlight(entity_t *e, pixel_t x, int lr, int lg, int lb)
{
int r, g, b;
if((x & 0xff000000U) == 0)
return x;
if(e != nil && (e->effects & EF_ADDITIVE) != 0)
return x;
r = (x>>16) & 0xff;
g = (x>>8) & 0xff;
b = (x>>0) & 0xff;
r = (r * ((64<<8)-(lr & 0xffff))) >> (8+VID_CBITS);
g = (g * ((64<<8)-(lg & 0xffff))) >> (8+VID_CBITS);
b = (b * ((64<<8)-(lb & 0xffff))) >> (8+VID_CBITS);
x = (x & 0xff000000) | r<<16 | g<<8 | b<<0;
return x;
}