/*
ProjectDecalOntoGrid()
projects a decal onto a grid (patch) surface
*/
static void ProjectDecalOntoGrid(decalProjector_t *dp, msurface_t *surf, bmodel_t *bmodel)
{
vec3_t points[2][MAX_DECAL_VERTS];
int x, y;
drawVert_t *dv;
srfGridMesh_t *srf = (srfGridMesh_t *) surf->data; // get surface
// walk mesh rows
for (y = 0; y < (srf->height - 1); y++)
{
// walk mesh cols
for (x = 0; x < (srf->width - 1); x++)
{
// get vertex
dv = srf->verts + y * srf->width + x;
// first triangle
VectorCopy(dv[0].xyz, points[0][0]);
VectorCopy(dv[srf->width].xyz, points[0][1]);
VectorCopy(dv[1].xyz, points[0][2]);
ProjectDecalOntoWinding(dp, 3, points, surf, bmodel);
// second triangle
VectorCopy(dv[1].xyz, points[0][0]);
VectorCopy(dv[srf->width].xyz, points[0][1]);
VectorCopy(dv[srf->width + 1].xyz, points[0][2]);
ProjectDecalOntoWinding(dp, 3, points, surf, bmodel);
}
}
}
static void ProjectDecalOntoGrid( decalProjector_t *dp, bspSurface_t *surf, bspModel_t *bmodel )
{
int x, y;
srfGridMesh_t *srf;
srfVert_t *dv;
vec3_t points[ 2 ][ MAX_DECAL_VERTS ];
/* get surface */
srf = ( srfGridMesh_t * ) surf->data;
/* walk mesh rows */
for ( y = 0; y < ( srf->height - 1 ); y++ )
{
/* walk mesh cols */
for ( x = 0; x < ( srf->width - 1 ); x++ )
{
/* get vertex */
dv = srf->verts + y * srf->width + x;
/* first triangle */
VectorCopy( dv[ 0 ].xyz, points[ 0 ][ 0 ] );
VectorCopy( dv[ srf->width ].xyz, points[ 0 ][ 1 ] );
VectorCopy( dv[ 1 ].xyz, points[ 0 ][ 2 ] );
ProjectDecalOntoWinding( dp, 3, points, surf, bmodel );
/* second triangle */
VectorCopy( dv[ 1 ].xyz, points[ 0 ][ 0 ] );
VectorCopy( dv[ srf->width ].xyz, points[ 0 ][ 1 ] );
VectorCopy( dv[ srf->width + 1 ].xyz, points[ 0 ][ 2 ] );
ProjectDecalOntoWinding( dp, 3, points, surf, bmodel );
}
}
}
static void ProjectDecalOntoTriangles( decalProjector_t *dp, mapDrawSurface_t *ds )
{
int i;
vec4_t plane;
float d;
winding_t *w;
/* triangle surfaces without shaders don't get marks by default */
if( ds->type == SURFACE_TRIANGLES && ds->shaderInfo->shaderText == NULL )
return;
/* backface check */
if( ds->planar )
{
VectorCopy( mapplanes[ ds->planeNum ].normal, plane );
plane[ 3 ] = mapplanes[ ds->planeNum ].dist + DotProduct( plane, entityOrigin );
d = DotProduct( dp->planes[ 0 ], plane );
if( d < -0.0001f )
return;
}
/* iterate through triangles */
for( i = 0; i < ds->numIndexes; i += 3 )
{
/* generate decal */
w = AllocWinding( 3 );
w->numpoints = 3;
VectorCopy( ds->verts[ ds->indexes[ i ] ].xyz, w->p[ 0 ] );
VectorCopy( ds->verts[ ds->indexes[ i + 1 ] ].xyz, w->p[ 1 ] );
VectorCopy( ds->verts[ ds->indexes[ i + 2 ] ].xyz, w->p[ 2 ] );
ProjectDecalOntoWinding( dp, ds, w );
}
}
static void ProjectDecalOntoFace( decalProjector_t *dp, mapDrawSurface_t *ds )
{
vec4_t plane;
float d;
winding_t *w;
/* dummy check */
if( ds->sideRef == NULL || ds->sideRef->side == NULL )
return;
/* backface check */
if( ds->planar )
{
VectorCopy( mapplanes[ ds->planeNum ].normal, plane );
plane[ 3 ] = mapplanes[ ds->planeNum ].dist + DotProduct( plane, entityOrigin );
d = DotProduct( dp->planes[ 0 ], plane );
if( d < -0.0001f )
return;
}
/* generate decal */
w = WindingFromDrawSurf( ds );
ProjectDecalOntoWinding( dp, ds, w );
}
static void ProjectDecalOntoTriangles( decalProjector_t *dp, bspSurface_t *surf, bspModel_t *bmodel )
{
int i;
srfTriangle_t *tri;
vec3_t points[ 2 ][ MAX_DECAL_VERTS ];
if ( *surf->data == SF_FACE )
{
/* get surface */
srfSurfaceFace_t *srf = ( srfSurfaceFace_t * ) surf->data;
/* walk triangle list */
for ( i = 0, tri = srf->triangles; i < srf->numTriangles; i++, tri++ )
{
/* make triangle */
VectorCopy( srf->verts[ tri->indexes[ 0 ] ].xyz, points[ 0 ][ 0 ] );
VectorCopy( srf->verts[ tri->indexes[ 1 ] ].xyz, points[ 0 ][ 1 ] );
VectorCopy( srf->verts[ tri->indexes[ 2 ] ].xyz, points[ 0 ][ 2 ] );
/* chop it */
ProjectDecalOntoWinding( dp, 3, points, surf, bmodel );
}
}
else if ( *surf->data == SF_TRIANGLES )
{
/* get surface */
srfTriangles_t *srf = ( srfTriangles_t * ) surf->data;
/* walk triangle list */
for ( i = 0, tri = srf->triangles; i < srf->numTriangles; i++, tri++ )
{
/* make triangle */
VectorCopy( srf->verts[ tri->indexes[ 0 ] ].xyz, points[ 0 ][ 0 ] );
VectorCopy( srf->verts[ tri->indexes[ 1 ] ].xyz, points[ 0 ][ 1 ] );
VectorCopy( srf->verts[ tri->indexes[ 2 ] ].xyz, points[ 0 ][ 2 ] );
/* chop it */
ProjectDecalOntoWinding( dp, 3, points, surf, bmodel );
}
}
}
/**
* @brief Projects a decal onto a triangle surface (brush faces, misc_models, metasurfaces)
* @param[in] dp
* @param[in] surf
* @param[in] bmodel
*/
static void ProjectDecalOntoTriangles(decalProjector_t *dp, msurface_t *surf, bmodel_t *bmodel)
{
vec3_t points[2][MAX_DECAL_VERTS];
int i;
srfTriangles_t *srf = (srfTriangles_t *) surf->data; // get surface
// walk triangle list
for (i = 0; i < srf->numIndexes; i += 3)
{
// make triangle
VectorCopy(srf->verts[srf->indexes[i]].xyz, points[0][0]);
VectorCopy(srf->verts[srf->indexes[i + 1]].xyz, points[0][1]);
VectorCopy(srf->verts[srf->indexes[i + 2]].xyz, points[0][2]);
// chop it
ProjectDecalOntoWinding(dp, 3, points, surf, bmodel);
}
}
static void ProjectDecalOntoPatch( decalProjector_t *dp, mapDrawSurface_t *ds )
{
int x, y, pw[ 5 ], r, iterations;
vec4_t plane;
float d;
mesh_t src, *mesh, *subdivided;
winding_t *w;
/* backface check */
if( ds->planar )
{
VectorCopy( mapplanes[ ds->planeNum ].normal, plane );
plane[ 3 ] = mapplanes[ ds->planeNum ].dist + DotProduct( plane, entityOrigin );
d = DotProduct( dp->planes[ 0 ], plane );
if( d < -0.0001f )
return;
}
/* tesselate the patch */
src.width = ds->patchWidth;
src.height = ds->patchHeight;
src.verts = ds->verts;
iterations = IterationsForCurve( ds->longestCurve, patch_subdivide->integer );
subdivided = SubdivideMesh2( src, iterations );
/* fit it to the curve and remove colinear verts on rows/columns */
PutMeshOnCurve( *subdivided );
mesh = RemoveLinearMeshColumnsRows( subdivided );
FreeMesh( subdivided );
/* iterate through the mesh quads */
for( y = 0; y < (mesh->height - 1); y++ )
{
for( x = 0; x < (mesh->width - 1); x++ )
{
/* set indexes */
pw[ 0 ] = x + (y * mesh->width);
pw[ 1 ] = x + ((y + 1) * mesh->width);
pw[ 2 ] = x + 1 + ((y + 1) * mesh->width);
pw[ 3 ] = x + 1 + (y * mesh->width);
pw[ 4 ] = x + (y * mesh->width); /* same as pw[ 0 ] */
/* set radix */
r = (x + y) & 1;
/* generate decal for first triangle */
w = AllocWinding( 3 );
w->numpoints = 3;
VectorCopy( mesh->verts[ pw[ r + 0 ] ].xyz, w->p[ 0 ] );
VectorCopy( mesh->verts[ pw[ r + 1 ] ].xyz, w->p[ 1 ] );
VectorCopy( mesh->verts[ pw[ r + 2 ] ].xyz, w->p[ 2 ] );
ProjectDecalOntoWinding( dp, ds, w );
/* generate decal for second triangle */
w = AllocWinding( 3 );
w->numpoints = 3;
VectorCopy( mesh->verts[ pw[ r + 0 ] ].xyz, w->p[ 0 ] );
VectorCopy( mesh->verts[ pw[ r + 2 ] ].xyz, w->p[ 1 ] );
VectorCopy( mesh->verts[ pw[ r + 3 ] ].xyz, w->p[ 2 ] );
ProjectDecalOntoWinding( dp, ds, w );
}
}
/* clean up */
Mem_Free( mesh );
}