static void ProjectDecalOntoWinding( decalProjector_t *dp, int numPoints, vec3_t points[ 2 ][ MAX_DECAL_VERTS ], bspSurface_t *surf,
bspModel_t *bmodel )
{
int i, pingPong, count, axis;
float pd, d, d2, alpha = 1.f;
vec4_t plane;
vec3_t absNormal;
decal_t *decal, *oldest;
polyVert_t *vert;
/* make a plane from the winding */
if ( !PlaneFromPoints( plane, points[ 0 ][ 0 ], points[ 0 ][ 1 ], points[ 0 ][ 2 ] ) )
{
return;
}
/* omnidirectional projectors need plane type */
if ( dp->omnidirectional )
{
/* compiler warnings be gone */
pd = 1.0f;
/* fade by distance from plane */
d = DotProduct( dp->center, plane ) - plane[ 3 ];
alpha = 1.0f - ( fabs( d ) / dp->radius );
if ( alpha < 0.0f )
{
return;
}
if ( alpha > 1.0f )
{
alpha = 1.0f;
}
/* set projection axis */
absNormal[ 0 ] = fabs( plane[ 0 ] );
absNormal[ 1 ] = fabs( plane[ 1 ] );
absNormal[ 2 ] = fabs( plane[ 2 ] );
if ( absNormal[ 2 ] >= absNormal[ 0 ] && absNormal[ 2 ] >= absNormal[ 1 ] )
{
axis = 2;
}
else if ( absNormal[ 0 ] >= absNormal[ 1 ] && absNormal[ 0 ] >= absNormal[ 2 ] )
{
axis = 0;
}
else
{
axis = 1;
}
}
else
{
/* backface check */
pd = DotProduct( dp->planes[ 0 ], plane );
if ( pd < -0.0001f )
{
return;
}
/* directional decals use first texture matrix */
axis = 0;
}
/* chop the winding by all the projector planes */
pingPong = 0;
for ( i = 0; i < dp->numPlanes; i++ ) //% dp->numPlanes
{
ChopWindingBehindPlane( numPoints, points[ pingPong ], &numPoints, points[ !pingPong ], dp->planes[ i ], 0.0f );
pingPong ^= 1;
if ( numPoints < 3 )
{
return;
}
if ( numPoints == MAX_DECAL_VERTS )
{
break;
}
}
/* find first free decal (fixme: optimize this) */
count = ( bmodel == tr.world->models ? MAX_WORLD_DECALS : MAX_ENTITY_DECALS );
oldest = &bmodel->decals[ 0 ];
decal = bmodel->decals;
for ( i = 0; i < count; i++, decal++ )
{
/* try to find an empty decal slot */
if ( decal->shader == NULL )
{
break;
}
/* find oldest decal */
if ( decal->fadeEndTime < oldest->fadeEndTime )
{
oldest = decal;
}
}
/* guess we have to use the oldest decal */
if ( i >= count )
{
decal = oldest;
}
/* r_speeds useful info */
tr.pc.c_decalSurfacesCreated++;
/* set it up (fixme: get the shader before this happens) */
decal->parent = surf;
decal->shader = dp->shader;
decal->fadeStartTime = dp->fadeStartTime;
decal->fadeEndTime = dp->fadeEndTime;
decal->fogIndex = surf->fogIndex;
/* add points */
decal->numVerts = numPoints;
vert = decal->verts;
for ( i = 0; i < numPoints; i++, vert++ )
{
/* set xyz */
VectorCopy( points[ pingPong ][ i ], vert->xyz );
/* set st */
vert->st[ 0 ] = DotProduct( vert->xyz, dp->texMat[ axis ][ 0 ] ) + dp->texMat[ axis ][ 0 ][ 3 ];
vert->st[ 1 ] = DotProduct( vert->xyz, dp->texMat[ axis ][ 1 ] ) + dp->texMat[ axis ][ 1 ][ 3 ];
/* unidirectional decals fade by half distance from front->back planes */
if ( !dp->omnidirectional )
{
/* set alpha */
d = DotProduct( vert->xyz, dp->planes[ 0 ] ) - dp->planes[ 0 ][ 3 ];
d2 = DotProduct( vert->xyz, dp->planes[ 1 ] ) - dp->planes[ 1 ][ 3 ];
alpha = 2.0f * d2 / ( d + d2 );
if ( alpha > 1.0f )
{
alpha = 1.0f;
}
else if ( alpha < 0.0f )
{
alpha = 0.0f;
}
}
/* set color */
vert->modulate[ 0 ] = Q_ftol( pd * alpha * dp->color[ 0 ] );
vert->modulate[ 1 ] = Q_ftol( pd * alpha * dp->color[ 1 ] );
vert->modulate[ 2 ] = Q_ftol( pd * alpha * dp->color[ 2 ] );
vert->modulate[ 3 ] = Q_ftol( alpha * dp->color[ 3 ] );
}
}
// projects decal onto a polygon
void ProjectDecalOntoWinding( decalProjector_t* dp, int numPoints, vec3_t points[ 2 ][ MAX_DECAL_VERTS ],
const idWorldSurface* surf, mbrush46_model_t* bmodel ) {
// make a plane from the winding
vec4_t plane;
if ( !PlaneFromPoints( plane, points[ 0 ][ 0 ], points[ 0 ][ 1 ], points[ 0 ][ 2 ] ) ) {
return;
}
// omnidirectional projectors need plane type
float pd;
int axis;
float alpha = 1.f;
if ( dp->omnidirectional ) {
pd = 1.0f;
// fade by distance from plane
float d = DotProduct( dp->center, plane ) - plane[ 3 ];
alpha = 1.0f - ( fabs( d ) / dp->radius );
if ( alpha < 0.0f ) {
return;
}
if ( alpha > 1.0f ) {
alpha = 1.0f;
}
// set projection axis
vec3_t absNormal;
absNormal[ 0 ] = fabs( plane[ 0 ] );
absNormal[ 1 ] = fabs( plane[ 1 ] );
absNormal[ 2 ] = fabs( plane[ 2 ] );
if ( absNormal[ 2 ] >= absNormal[ 0 ] && absNormal[ 2 ] >= absNormal[ 1 ] ) {
axis = 2;
} else if ( absNormal[ 0 ] >= absNormal[ 1 ] && absNormal[ 0 ] >= absNormal[ 2 ] ) {
axis = 0;
} else {
axis = 1;
}
} else {
// backface check
pd = DotProduct( dp->planes[ 0 ], plane );
if ( pd < -0.0001f ) {
return;
}
// directional decals use first texture matrix
axis = 0;
}
// chop the winding by all the projector planes
int pingPong = 0;
for ( int i = 0; i < dp->numPlanes; i++ ) {
ChopWindingBehindPlane( numPoints, points[ pingPong ], &numPoints, points[ !pingPong ], dp->planes[ i ], 0.0f );
pingPong ^= 1;
if ( numPoints < 3 ) {
return;
}
if ( numPoints == MAX_DECAL_VERTS ) {
break;
}
}
// find first free decal (fixme: optimize this)
int count = ( bmodel == tr.world->bmodels ? MAX_WORLD_DECALS : MAX_ENTITY_DECALS );
mbrush46_decal_t* oldest = &bmodel->decals[ 0 ];
mbrush46_decal_t* decal = bmodel->decals;
int i;
for ( i = 0; i < count; i++, decal++ ) {
// try to find an empty decal slot
if ( decal->shader == NULL ) {
break;
}
// find oldest decal
if ( decal->fadeEndTime < oldest->fadeEndTime ) {
oldest = decal;
}
}
// guess we have to use the oldest decal
if ( i >= count ) {
decal = oldest;
}
// r_speeds useful info
tr.pc.c_decalSurfacesCreated++;
// set it up (fixme: get the shader before this happens)
decal->parent = surf;
decal->shader = dp->shader;
decal->fadeStartTime = dp->fadeStartTime;
decal->fadeEndTime = dp->fadeEndTime;
decal->fogIndex = surf->fogIndex;
// add points
decal->numVerts = numPoints;
polyVert_t* vert = decal->verts;
for ( i = 0; i < numPoints; i++, vert++ ) {
// set xyz
VectorCopy( points[ pingPong ][ i ], vert->xyz );
// set st
vert->st[ 0 ] = DotProduct( vert->xyz, dp->texMat[ axis ][ 0 ] ) + dp->texMat[ axis ][ 0 ][ 3 ];
vert->st[ 1 ] = DotProduct( vert->xyz, dp->texMat[ axis ][ 1 ] ) + dp->texMat[ axis ][ 1 ][ 3 ];
// unidirectional decals fade by half distance from front->back planes
if ( !dp->omnidirectional ) {
// set alpha
float d = DotProduct( vert->xyz, dp->planes[ 0 ] ) - dp->planes[ 0 ][ 3 ];
float d2 = DotProduct( vert->xyz, dp->planes[ 1 ] ) - dp->planes[ 1 ][ 3 ];
alpha = 2.0f * d2 / ( d + d2 );
if ( alpha > 1.0f ) {
alpha = 1.0f;
} else if ( alpha < 0.0f ) {
alpha = 0.0f;
}
}
// set color
vert->modulate[ 0 ] = idMath::FtoiFast( pd * alpha * dp->color[ 0 ] );
vert->modulate[ 1 ] = idMath::FtoiFast( pd * alpha * dp->color[ 1 ] );
vert->modulate[ 2 ] = idMath::FtoiFast( pd * alpha * dp->color[ 2 ] );
vert->modulate[ 3 ] = idMath::FtoiFast( alpha * dp->color[ 3 ] );
}
}