mirror of
https://github.com/id-Software/Quake-2.git
synced 2026-03-20 00:49:31 +01:00
The original Quake 2 sources as originally released under the GPL license on December 21, 2001.
This commit is contained in:
Travis Bradshaw
729
ref_gl/gl_light.c
Normal file
729
ref_gl/gl_light.c
Normal file
@@ -0,0 +1,729 @@
|
||||
/*
|
||||
Copyright (C) 1997-2001 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.
|
||||
|
||||
*/
|
||||
// r_light.c
|
||||
|
||||
#include "gl_local.h"
|
||||
|
||||
int r_dlightframecount;
|
||||
|
||||
#define DLIGHT_CUTOFF 64
|
||||
|
||||
/*
|
||||
=============================================================================
|
||||
|
||||
DYNAMIC LIGHTS BLEND RENDERING
|
||||
|
||||
=============================================================================
|
||||
*/
|
||||
|
||||
void R_RenderDlight (dlight_t *light)
|
||||
{
|
||||
int i, j;
|
||||
float a;
|
||||
vec3_t v;
|
||||
float rad;
|
||||
|
||||
rad = light->intensity * 0.35;
|
||||
|
||||
VectorSubtract (light->origin, r_origin, v);
|
||||
#if 0
|
||||
// FIXME?
|
||||
if (VectorLength (v) < rad)
|
||||
{ // view is inside the dlight
|
||||
V_AddBlend (light->color[0], light->color[1], light->color[2], light->intensity * 0.0003, v_blend);
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
|
||||
qglBegin (GL_TRIANGLE_FAN);
|
||||
qglColor3f (light->color[0]*0.2, light->color[1]*0.2, light->color[2]*0.2);
|
||||
for (i=0 ; i<3 ; i++)
|
||||
v[i] = light->origin[i] - vpn[i]*rad;
|
||||
qglVertex3fv (v);
|
||||
qglColor3f (0,0,0);
|
||||
for (i=16 ; i>=0 ; i--)
|
||||
{
|
||||
a = i/16.0 * M_PI*2;
|
||||
for (j=0 ; j<3 ; j++)
|
||||
v[j] = light->origin[j] + vright[j]*cos(a)*rad
|
||||
+ vup[j]*sin(a)*rad;
|
||||
qglVertex3fv (v);
|
||||
}
|
||||
qglEnd ();
|
||||
}
|
||||
|
||||
/*
|
||||
=============
|
||||
R_RenderDlights
|
||||
=============
|
||||
*/
|
||||
void R_RenderDlights (void)
|
||||
{
|
||||
int i;
|
||||
dlight_t *l;
|
||||
|
||||
if (!gl_flashblend->value)
|
||||
return;
|
||||
|
||||
r_dlightframecount = r_framecount + 1; // because the count hasn't
|
||||
// advanced yet for this frame
|
||||
qglDepthMask (0);
|
||||
qglDisable (GL_TEXTURE_2D);
|
||||
qglShadeModel (GL_SMOOTH);
|
||||
qglEnable (GL_BLEND);
|
||||
qglBlendFunc (GL_ONE, GL_ONE);
|
||||
|
||||
l = r_newrefdef.dlights;
|
||||
for (i=0 ; i<r_newrefdef.num_dlights ; i++, l++)
|
||||
R_RenderDlight (l);
|
||||
|
||||
qglColor3f (1,1,1);
|
||||
qglDisable (GL_BLEND);
|
||||
qglEnable (GL_TEXTURE_2D);
|
||||
qglBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
|
||||
qglDepthMask (1);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
=============================================================================
|
||||
|
||||
DYNAMIC LIGHTS
|
||||
|
||||
=============================================================================
|
||||
*/
|
||||
|
||||
/*
|
||||
=============
|
||||
R_MarkLights
|
||||
=============
|
||||
*/
|
||||
void R_MarkLights (dlight_t *light, int bit, mnode_t *node)
|
||||
{
|
||||
cplane_t *splitplane;
|
||||
float dist;
|
||||
msurface_t *surf;
|
||||
int i;
|
||||
|
||||
if (node->contents != -1)
|
||||
return;
|
||||
|
||||
splitplane = node->plane;
|
||||
dist = DotProduct (light->origin, splitplane->normal) - splitplane->dist;
|
||||
|
||||
if (dist > light->intensity-DLIGHT_CUTOFF)
|
||||
{
|
||||
R_MarkLights (light, bit, node->children[0]);
|
||||
return;
|
||||
}
|
||||
if (dist < -light->intensity+DLIGHT_CUTOFF)
|
||||
{
|
||||
R_MarkLights (light, bit, node->children[1]);
|
||||
return;
|
||||
}
|
||||
|
||||
// mark the polygons
|
||||
surf = r_worldmodel->surfaces + node->firstsurface;
|
||||
for (i=0 ; i<node->numsurfaces ; i++, surf++)
|
||||
{
|
||||
if (surf->dlightframe != r_dlightframecount)
|
||||
{
|
||||
surf->dlightbits = 0;
|
||||
surf->dlightframe = r_dlightframecount;
|
||||
}
|
||||
surf->dlightbits |= bit;
|
||||
}
|
||||
|
||||
R_MarkLights (light, bit, node->children[0]);
|
||||
R_MarkLights (light, bit, node->children[1]);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
=============
|
||||
R_PushDlights
|
||||
=============
|
||||
*/
|
||||
void R_PushDlights (void)
|
||||
{
|
||||
int i;
|
||||
dlight_t *l;
|
||||
|
||||
if (gl_flashblend->value)
|
||||
return;
|
||||
|
||||
r_dlightframecount = r_framecount + 1; // because the count hasn't
|
||||
// advanced yet for this frame
|
||||
l = r_newrefdef.dlights;
|
||||
for (i=0 ; i<r_newrefdef.num_dlights ; i++, l++)
|
||||
R_MarkLights ( l, 1<<i, r_worldmodel->nodes );
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
=============================================================================
|
||||
|
||||
LIGHT SAMPLING
|
||||
|
||||
=============================================================================
|
||||
*/
|
||||
|
||||
vec3_t pointcolor;
|
||||
cplane_t *lightplane; // used as shadow plane
|
||||
vec3_t lightspot;
|
||||
|
||||
int RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
|
||||
{
|
||||
float front, back, frac;
|
||||
int side;
|
||||
cplane_t *plane;
|
||||
vec3_t mid;
|
||||
msurface_t *surf;
|
||||
int s, t, ds, dt;
|
||||
int i;
|
||||
mtexinfo_t *tex;
|
||||
byte *lightmap;
|
||||
int maps;
|
||||
int r;
|
||||
|
||||
if (node->contents != -1)
|
||||
return -1; // didn't hit anything
|
||||
|
||||
// calculate mid point
|
||||
|
||||
// FIXME: optimize for axial
|
||||
plane = node->plane;
|
||||
front = DotProduct (start, plane->normal) - plane->dist;
|
||||
back = DotProduct (end, plane->normal) - plane->dist;
|
||||
side = front < 0;
|
||||
|
||||
if ( (back < 0) == side)
|
||||
return RecursiveLightPoint (node->children[side], start, end);
|
||||
|
||||
frac = front / (front-back);
|
||||
mid[0] = start[0] + (end[0] - start[0])*frac;
|
||||
mid[1] = start[1] + (end[1] - start[1])*frac;
|
||||
mid[2] = start[2] + (end[2] - start[2])*frac;
|
||||
|
||||
// go down front side
|
||||
r = RecursiveLightPoint (node->children[side], start, mid);
|
||||
if (r >= 0)
|
||||
return r; // hit something
|
||||
|
||||
if ( (back < 0) == side )
|
||||
return -1; // didn't hit anuthing
|
||||
|
||||
// check for impact on this node
|
||||
VectorCopy (mid, lightspot);
|
||||
lightplane = plane;
|
||||
|
||||
surf = r_worldmodel->surfaces + node->firstsurface;
|
||||
for (i=0 ; i<node->numsurfaces ; i++, surf++)
|
||||
{
|
||||
if (surf->flags&(SURF_DRAWTURB|SURF_DRAWSKY))
|
||||
continue; // no lightmaps
|
||||
|
||||
tex = surf->texinfo;
|
||||
|
||||
s = DotProduct (mid, tex->vecs[0]) + tex->vecs[0][3];
|
||||
t = DotProduct (mid, tex->vecs[1]) + tex->vecs[1][3];;
|
||||
|
||||
if (s < surf->texturemins[0] ||
|
||||
t < surf->texturemins[1])
|
||||
continue;
|
||||
|
||||
ds = s - surf->texturemins[0];
|
||||
dt = t - surf->texturemins[1];
|
||||
|
||||
if ( ds > surf->extents[0] || dt > surf->extents[1] )
|
||||
continue;
|
||||
|
||||
if (!surf->samples)
|
||||
return 0;
|
||||
|
||||
ds >>= 4;
|
||||
dt >>= 4;
|
||||
|
||||
lightmap = surf->samples;
|
||||
VectorCopy (vec3_origin, pointcolor);
|
||||
if (lightmap)
|
||||
{
|
||||
vec3_t scale;
|
||||
|
||||
lightmap += 3*(dt * ((surf->extents[0]>>4)+1) + ds);
|
||||
|
||||
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
|
||||
maps++)
|
||||
{
|
||||
for (i=0 ; i<3 ; i++)
|
||||
scale[i] = gl_modulate->value*r_newrefdef.lightstyles[surf->styles[maps]].rgb[i];
|
||||
|
||||
pointcolor[0] += lightmap[0] * scale[0] * (1.0/255);
|
||||
pointcolor[1] += lightmap[1] * scale[1] * (1.0/255);
|
||||
pointcolor[2] += lightmap[2] * scale[2] * (1.0/255);
|
||||
lightmap += 3*((surf->extents[0]>>4)+1) *
|
||||
((surf->extents[1]>>4)+1);
|
||||
}
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
// go down back side
|
||||
return RecursiveLightPoint (node->children[!side], mid, end);
|
||||
}
|
||||
|
||||
/*
|
||||
===============
|
||||
R_LightPoint
|
||||
===============
|
||||
*/
|
||||
void R_LightPoint (vec3_t p, vec3_t color)
|
||||
{
|
||||
vec3_t end;
|
||||
float r;
|
||||
int lnum;
|
||||
dlight_t *dl;
|
||||
float light;
|
||||
vec3_t dist;
|
||||
float add;
|
||||
|
||||
if (!r_worldmodel->lightdata)
|
||||
{
|
||||
color[0] = color[1] = color[2] = 1.0;
|
||||
return;
|
||||
}
|
||||
|
||||
end[0] = p[0];
|
||||
end[1] = p[1];
|
||||
end[2] = p[2] - 2048;
|
||||
|
||||
r = RecursiveLightPoint (r_worldmodel->nodes, p, end);
|
||||
|
||||
if (r == -1)
|
||||
{
|
||||
VectorCopy (vec3_origin, color);
|
||||
}
|
||||
else
|
||||
{
|
||||
VectorCopy (pointcolor, color);
|
||||
}
|
||||
|
||||
//
|
||||
// add dynamic lights
|
||||
//
|
||||
light = 0;
|
||||
dl = r_newrefdef.dlights;
|
||||
for (lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++, dl++)
|
||||
{
|
||||
VectorSubtract (currententity->origin,
|
||||
dl->origin,
|
||||
dist);
|
||||
add = dl->intensity - VectorLength(dist);
|
||||
add *= (1.0/256);
|
||||
if (add > 0)
|
||||
{
|
||||
VectorMA (color, add, dl->color, color);
|
||||
}
|
||||
}
|
||||
|
||||
VectorScale (color, gl_modulate->value, color);
|
||||
}
|
||||
|
||||
|
||||
//===================================================================
|
||||
|
||||
static float s_blocklights[34*34*3];
|
||||
/*
|
||||
===============
|
||||
R_AddDynamicLights
|
||||
===============
|
||||
*/
|
||||
void R_AddDynamicLights (msurface_t *surf)
|
||||
{
|
||||
int lnum;
|
||||
int sd, td;
|
||||
float fdist, frad, fminlight;
|
||||
vec3_t impact, local;
|
||||
int s, t;
|
||||
int i;
|
||||
int smax, tmax;
|
||||
mtexinfo_t *tex;
|
||||
dlight_t *dl;
|
||||
float *pfBL;
|
||||
float fsacc, ftacc;
|
||||
|
||||
smax = (surf->extents[0]>>4)+1;
|
||||
tmax = (surf->extents[1]>>4)+1;
|
||||
tex = surf->texinfo;
|
||||
|
||||
for (lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++)
|
||||
{
|
||||
if ( !(surf->dlightbits & (1<<lnum) ) )
|
||||
continue; // not lit by this light
|
||||
|
||||
dl = &r_newrefdef.dlights[lnum];
|
||||
frad = dl->intensity;
|
||||
fdist = DotProduct (dl->origin, surf->plane->normal) -
|
||||
surf->plane->dist;
|
||||
frad -= fabs(fdist);
|
||||
// rad is now the highest intensity on the plane
|
||||
|
||||
fminlight = DLIGHT_CUTOFF; // FIXME: make configurable?
|
||||
if (frad < fminlight)
|
||||
continue;
|
||||
fminlight = frad - fminlight;
|
||||
|
||||
for (i=0 ; i<3 ; i++)
|
||||
{
|
||||
impact[i] = dl->origin[i] -
|
||||
surf->plane->normal[i]*fdist;
|
||||
}
|
||||
|
||||
local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3] - surf->texturemins[0];
|
||||
local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3] - surf->texturemins[1];
|
||||
|
||||
pfBL = s_blocklights;
|
||||
for (t = 0, ftacc = 0 ; t<tmax ; t++, ftacc += 16)
|
||||
{
|
||||
td = local[1] - ftacc;
|
||||
if ( td < 0 )
|
||||
td = -td;
|
||||
|
||||
for ( s=0, fsacc = 0 ; s<smax ; s++, fsacc += 16, pfBL += 3)
|
||||
{
|
||||
sd = Q_ftol( local[0] - fsacc );
|
||||
|
||||
if ( sd < 0 )
|
||||
sd = -sd;
|
||||
|
||||
if (sd > td)
|
||||
fdist = sd + (td>>1);
|
||||
else
|
||||
fdist = td + (sd>>1);
|
||||
|
||||
if ( fdist < fminlight )
|
||||
{
|
||||
pfBL[0] += ( frad - fdist ) * dl->color[0];
|
||||
pfBL[1] += ( frad - fdist ) * dl->color[1];
|
||||
pfBL[2] += ( frad - fdist ) * dl->color[2];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** R_SetCacheState
|
||||
*/
|
||||
void R_SetCacheState( msurface_t *surf )
|
||||
{
|
||||
int maps;
|
||||
|
||||
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
|
||||
maps++)
|
||||
{
|
||||
surf->cached_light[maps] = r_newrefdef.lightstyles[surf->styles[maps]].white;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
===============
|
||||
R_BuildLightMap
|
||||
|
||||
Combine and scale multiple lightmaps into the floating format in blocklights
|
||||
===============
|
||||
*/
|
||||
void R_BuildLightMap (msurface_t *surf, byte *dest, int stride)
|
||||
{
|
||||
int smax, tmax;
|
||||
int r, g, b, a, max;
|
||||
int i, j, size;
|
||||
byte *lightmap;
|
||||
float scale[4];
|
||||
int nummaps;
|
||||
float *bl;
|
||||
lightstyle_t *style;
|
||||
int monolightmap;
|
||||
|
||||
if ( surf->texinfo->flags & (SURF_SKY|SURF_TRANS33|SURF_TRANS66|SURF_WARP) )
|
||||
ri.Sys_Error (ERR_DROP, "R_BuildLightMap called for non-lit surface");
|
||||
|
||||
smax = (surf->extents[0]>>4)+1;
|
||||
tmax = (surf->extents[1]>>4)+1;
|
||||
size = smax*tmax;
|
||||
if (size > (sizeof(s_blocklights)>>4) )
|
||||
ri.Sys_Error (ERR_DROP, "Bad s_blocklights size");
|
||||
|
||||
// set to full bright if no light data
|
||||
if (!surf->samples)
|
||||
{
|
||||
int maps;
|
||||
|
||||
for (i=0 ; i<size*3 ; i++)
|
||||
s_blocklights[i] = 255;
|
||||
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
|
||||
maps++)
|
||||
{
|
||||
style = &r_newrefdef.lightstyles[surf->styles[maps]];
|
||||
}
|
||||
goto store;
|
||||
}
|
||||
|
||||
// count the # of maps
|
||||
for ( nummaps = 0 ; nummaps < MAXLIGHTMAPS && surf->styles[nummaps] != 255 ;
|
||||
nummaps++)
|
||||
;
|
||||
|
||||
lightmap = surf->samples;
|
||||
|
||||
// add all the lightmaps
|
||||
if ( nummaps == 1 )
|
||||
{
|
||||
int maps;
|
||||
|
||||
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
|
||||
maps++)
|
||||
{
|
||||
bl = s_blocklights;
|
||||
|
||||
for (i=0 ; i<3 ; i++)
|
||||
scale[i] = gl_modulate->value*r_newrefdef.lightstyles[surf->styles[maps]].rgb[i];
|
||||
|
||||
if ( scale[0] == 1.0F &&
|
||||
scale[1] == 1.0F &&
|
||||
scale[2] == 1.0F )
|
||||
{
|
||||
for (i=0 ; i<size ; i++, bl+=3)
|
||||
{
|
||||
bl[0] = lightmap[i*3+0];
|
||||
bl[1] = lightmap[i*3+1];
|
||||
bl[2] = lightmap[i*3+2];
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i=0 ; i<size ; i++, bl+=3)
|
||||
{
|
||||
bl[0] = lightmap[i*3+0] * scale[0];
|
||||
bl[1] = lightmap[i*3+1] * scale[1];
|
||||
bl[2] = lightmap[i*3+2] * scale[2];
|
||||
}
|
||||
}
|
||||
lightmap += size*3; // skip to next lightmap
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
int maps;
|
||||
|
||||
memset( s_blocklights, 0, sizeof( s_blocklights[0] ) * size * 3 );
|
||||
|
||||
for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
|
||||
maps++)
|
||||
{
|
||||
bl = s_blocklights;
|
||||
|
||||
for (i=0 ; i<3 ; i++)
|
||||
scale[i] = gl_modulate->value*r_newrefdef.lightstyles[surf->styles[maps]].rgb[i];
|
||||
|
||||
if ( scale[0] == 1.0F &&
|
||||
scale[1] == 1.0F &&
|
||||
scale[2] == 1.0F )
|
||||
{
|
||||
for (i=0 ; i<size ; i++, bl+=3 )
|
||||
{
|
||||
bl[0] += lightmap[i*3+0];
|
||||
bl[1] += lightmap[i*3+1];
|
||||
bl[2] += lightmap[i*3+2];
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i=0 ; i<size ; i++, bl+=3)
|
||||
{
|
||||
bl[0] += lightmap[i*3+0] * scale[0];
|
||||
bl[1] += lightmap[i*3+1] * scale[1];
|
||||
bl[2] += lightmap[i*3+2] * scale[2];
|
||||
}
|
||||
}
|
||||
lightmap += size*3; // skip to next lightmap
|
||||
}
|
||||
}
|
||||
|
||||
// add all the dynamic lights
|
||||
if (surf->dlightframe == r_framecount)
|
||||
R_AddDynamicLights (surf);
|
||||
|
||||
// put into texture format
|
||||
store:
|
||||
stride -= (smax<<2);
|
||||
bl = s_blocklights;
|
||||
|
||||
monolightmap = gl_monolightmap->string[0];
|
||||
|
||||
if ( monolightmap == '0' )
|
||||
{
|
||||
for (i=0 ; i<tmax ; i++, dest += stride)
|
||||
{
|
||||
for (j=0 ; j<smax ; j++)
|
||||
{
|
||||
|
||||
r = Q_ftol( bl[0] );
|
||||
g = Q_ftol( bl[1] );
|
||||
b = Q_ftol( bl[2] );
|
||||
|
||||
// catch negative lights
|
||||
if (r < 0)
|
||||
r = 0;
|
||||
if (g < 0)
|
||||
g = 0;
|
||||
if (b < 0)
|
||||
b = 0;
|
||||
|
||||
/*
|
||||
** determine the brightest of the three color components
|
||||
*/
|
||||
if (r > g)
|
||||
max = r;
|
||||
else
|
||||
max = g;
|
||||
if (b > max)
|
||||
max = b;
|
||||
|
||||
/*
|
||||
** alpha is ONLY used for the mono lightmap case. For this reason
|
||||
** we set it to the brightest of the color components so that
|
||||
** things don't get too dim.
|
||||
*/
|
||||
a = max;
|
||||
|
||||
/*
|
||||
** rescale all the color components if the intensity of the greatest
|
||||
** channel exceeds 1.0
|
||||
*/
|
||||
if (max > 255)
|
||||
{
|
||||
float t = 255.0F / max;
|
||||
|
||||
r = r*t;
|
||||
g = g*t;
|
||||
b = b*t;
|
||||
a = a*t;
|
||||
}
|
||||
|
||||
dest[0] = r;
|
||||
dest[1] = g;
|
||||
dest[2] = b;
|
||||
dest[3] = a;
|
||||
|
||||
bl += 3;
|
||||
dest += 4;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
for (i=0 ; i<tmax ; i++, dest += stride)
|
||||
{
|
||||
for (j=0 ; j<smax ; j++)
|
||||
{
|
||||
|
||||
r = Q_ftol( bl[0] );
|
||||
g = Q_ftol( bl[1] );
|
||||
b = Q_ftol( bl[2] );
|
||||
|
||||
// catch negative lights
|
||||
if (r < 0)
|
||||
r = 0;
|
||||
if (g < 0)
|
||||
g = 0;
|
||||
if (b < 0)
|
||||
b = 0;
|
||||
|
||||
/*
|
||||
** determine the brightest of the three color components
|
||||
*/
|
||||
if (r > g)
|
||||
max = r;
|
||||
else
|
||||
max = g;
|
||||
if (b > max)
|
||||
max = b;
|
||||
|
||||
/*
|
||||
** alpha is ONLY used for the mono lightmap case. For this reason
|
||||
** we set it to the brightest of the color components so that
|
||||
** things don't get too dim.
|
||||
*/
|
||||
a = max;
|
||||
|
||||
/*
|
||||
** rescale all the color components if the intensity of the greatest
|
||||
** channel exceeds 1.0
|
||||
*/
|
||||
if (max > 255)
|
||||
{
|
||||
float t = 255.0F / max;
|
||||
|
||||
r = r*t;
|
||||
g = g*t;
|
||||
b = b*t;
|
||||
a = a*t;
|
||||
}
|
||||
|
||||
/*
|
||||
** So if we are doing alpha lightmaps we need to set the R, G, and B
|
||||
** components to 0 and we need to set alpha to 1-alpha.
|
||||
*/
|
||||
switch ( monolightmap )
|
||||
{
|
||||
case 'L':
|
||||
case 'I':
|
||||
r = a;
|
||||
g = b = 0;
|
||||
break;
|
||||
case 'C':
|
||||
// try faking colored lighting
|
||||
a = 255 - ((r+g+b)/3);
|
||||
r *= a/255.0;
|
||||
g *= a/255.0;
|
||||
b *= a/255.0;
|
||||
break;
|
||||
case 'A':
|
||||
default:
|
||||
r = g = b = 0;
|
||||
a = 255 - a;
|
||||
break;
|
||||
}
|
||||
|
||||
dest[0] = r;
|
||||
dest[1] = g;
|
||||
dest[2] = b;
|
||||
dest[3] = a;
|
||||
|
||||
bl += 3;
|
||||
dest += 4;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user