ref: 2772ba4f6025cd091184c15675e29211c355b3a7
dir: /r_surf.c/
#include "quakedef.h"
drawsurf_t r_drawsurf;
static int sourcetstep;
static int surfrowbytes; // used by ASM files
static int r_stepback;
static int r_numhblocks, r_numvblocks;
static pixel_t *r_source, *r_sourcemax;
static unsigned *r_lightptr[3];
static int r_lightwidth;
static pixel_t *pbasesource;
static void *prowdestbase;
static void R_DrawSurfaceBlock8(int mip);
static unsigned blocklights[3][18*18];
/*
===============
R_AddDynamicLights
===============
*/
void R_AddDynamicLights (void)
{
msurface_t *surf;
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;
surf = r_drawsurf.surf;
smax = (surf->extents[0]>>4)+1;
tmax = (surf->extents[1]>>4)+1;
tex = surf->texinfo;
for (lnum=0 ; lnum<MAX_DLIGHTS ; lnum++)
{
if ( !(surf->dlightbits & (1<<lnum) ) )
continue; // not lit by this light
rad = cl_dlights[lnum].radius;
VectorSubtract(cl_dlights[lnum].origin, currententity->origin, entorigin);
dist = DotProduct (entorigin, surf->plane->normal) -
surf->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] -
surf->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] -= surf->texturemins[0];
local[1] -= surf->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){
blocklights[0][t*smax + s] += (rad - dist)*256;
blocklights[1][t*smax + s] += (rad - dist)*256;
blocklights[2][t*smax + s] += (rad - dist)*256;
}
}
}
}
}
/*
===============
R_BuildLightMap
Combine and scale multiple lightmaps into the 8.8 format in blocklights
===============
*/
void R_BuildLightMap (void)
{
int smax, tmax;
int t;
int i, size;
byte *lightmap;
unsigned scale;
int maps;
msurface_t *surf;
surf = r_drawsurf.surf;
smax = (surf->extents[0]>>4)+1;
tmax = (surf->extents[1]>>4)+1;
size = smax*tmax;
lightmap = surf->samples;
if (r_fullbright.value || !cl.worldmodel->lightdata)
{
memset(blocklights, 0, sizeof(blocklights));
return;
}
// clear to ambient
for (i=0 ; i<size ; i++){
blocklights[0][i] = r_refdef.ambientlight[0]<<8;
blocklights[1][i] = r_refdef.ambientlight[1]<<8;
blocklights[2][i] = r_refdef.ambientlight[2]<<8;
}
// add all the lightmaps
if (lightmap)
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
maps++)
{
scale = r_drawsurf.lightadj[maps]; // 8.8 fraction
for (i=0 ; i<size ; i++){
blocklights[0][i] += lightmap[i*3+0] * scale;
blocklights[1][i] += lightmap[i*3+1] * scale;
blocklights[2][i] += lightmap[i*3+2] * scale;
}
lightmap += size * 3; // skip to next lightmap
}
// add all the dynamic lights
if (surf->dlightframe == r_framecount)
R_AddDynamicLights ();
// bound, invert, and shift
for (i=0 ; i<size ; i++)
{
t = (255*256 - (int)blocklights[0][i]) >> (8 - VID_CBITS);
blocklights[0][i] = max(t, (1<<6));
t = (255*256 - (int)blocklights[1][i]) >> (8 - VID_CBITS);
blocklights[1][i] = max(t, (1<<6));
t = (255*256 - (int)blocklights[2][i]) >> (8 - VID_CBITS);
blocklights[2][i] = max(t, (1<<6));
}
}
/*
===============
R_TextureAnimation
Returns the proper texture for a given time and base texture
===============
*/
texture_t *R_TextureAnimation (texture_t *base)
{
int reletive;
int count;
if (currententity->frame)
{
if (base->alternate_anims)
base = base->alternate_anims;
}
if (!base->anim_total)
return base;
reletive = (int)(cl.time*10) % base->anim_total;
count = 0;
while (base->anim_min > reletive || base->anim_max <= reletive)
{
base = base->anim_next;
if (!base)
fatal ("R_TextureAnimation: broken cycle");
if (++count > 100)
fatal ("R_TextureAnimation: infinite cycle");
}
return base;
}
/*
===============
R_DrawSurface
===============
*/
void R_DrawSurface (void)
{
pixel_t *basetptr;
int smax, tmax, twidth;
int u, blockdivshift, blocksize;
int soffset, basetoffset, texwidth;
int horzblockstep;
pixel_t *pcolumndest;
texture_t *mt;
// calculate the lightings
R_BuildLightMap ();
surfrowbytes = r_drawsurf.rowbytes;
mt = r_drawsurf.texture;
r_source = mt->pixels + mt->offsets[r_drawsurf.surfmip];
// the fractional light values should range from 0 to (VID_GRADES - 1) << 16
// from a source range of 0 - 255
texwidth = mt->width >> r_drawsurf.surfmip;
blocksize = 16 >> r_drawsurf.surfmip;
blockdivshift = 4 - r_drawsurf.surfmip;
r_lightwidth = (r_drawsurf.surf->extents[0]>>4)+1;
r_numhblocks = r_drawsurf.surfwidth >> blockdivshift;
r_numvblocks = r_drawsurf.surfheight >> blockdivshift;
// TODO: only needs to be set when there is a display settings change
horzblockstep = blocksize;
smax = mt->width >> r_drawsurf.surfmip;
twidth = texwidth;
tmax = mt->height >> r_drawsurf.surfmip;
sourcetstep = texwidth;
r_stepback = tmax * twidth;
r_sourcemax = r_source + (tmax * smax);
soffset = r_drawsurf.surf->texturemins[0];
basetoffset = r_drawsurf.surf->texturemins[1];
// << 16 components are to guarantee positive values for %
soffset = ((soffset >> r_drawsurf.surfmip) + (smax << 16)) % smax;
basetptr = &r_source[((((basetoffset >> r_drawsurf.surfmip)
+ (tmax << 16)) % tmax) * twidth)];
pcolumndest = r_drawsurf.surfdat;
for (u=0 ; u<r_numhblocks; u++)
{
r_lightptr[0] = blocklights[0] + u;
r_lightptr[1] = blocklights[1] + u;
r_lightptr[2] = blocklights[2] + u;
prowdestbase = pcolumndest;
pbasesource = basetptr + soffset;
R_DrawSurfaceBlock8(r_drawsurf.surfmip);
soffset = soffset + blocksize;
if (soffset >= smax)
soffset = 0;
pcolumndest += horzblockstep;
}
}
//=============================================================================
pixel_t
addlight(pixel_t x, int lr, int lg, int lb)
{
int r, g, b, y[3];
r = (x>>16) & 0xff;
g = (x>>8) & 0xff;
b = (x>>0) & 0xff;
y[0] = (lr & 0xff00) >> 8;
y[1] = (lg & 0xff00) >> 8;
y[2] = (lb & 0xff00) >> 8;
r = (r * (63-y[0])+16) >> 5; r = min(r, 255);
g = (g * (63-y[1])+16) >> 5; g = min(g, 255);
b = (b * (63-y[2])+16) >> 5; b = min(b, 255);
x = (x & ~0xffffff) | r<<16 | g<<8 | b<<0;
return x;
}
static void
R_DrawSurfaceBlock8(int mip)
{
int b, v, i, j, lightstep[3], light[3], lightleft[3], lightright[3];
int lightleftstep[3], lightrightstep[3];
pixel_t *psource, *prowdest;
psource = pbasesource;
prowdest = prowdestbase;
for (v=0 ; v<r_numvblocks ; v++)
{
for(j = 0; j < 3; j++){
lightleft[j] = r_lightptr[j][0];
lightright[j] = r_lightptr[j][1];
r_lightptr[j] += r_lightwidth;
lightleftstep[j] = (r_lightptr[j][0] - lightleft[j]) >> (4-mip);
lightrightstep[j] = (r_lightptr[j][1] - lightright[j]) >> (4-mip);
}
for (i=0 ; i<16>>mip ; i++)
{
for(j = 0; j < 3; j++){
lightstep[j] = (lightleft[j] - lightright[j]) >> (4-mip);
light[j] = lightright[j];
}
for(b = (16>>mip)-1; b >= 0; b--){
prowdest[b] = addlight(psource[b], light[0], light[1], light[2]);
light[0] += lightstep[0];
light[1] += lightstep[1];
light[2] += lightstep[2];
}
psource += sourcetstep;
prowdest += surfrowbytes;
for(j = 0; j < 3; j++){
lightright[j] += lightrightstep[j];
lightleft[j] += lightleftstep[j];
}
}
if (psource >= r_sourcemax)
psource -= r_stepback;
}
}