/*
===================
R_ProjectPointsToFarPlane
make a projected copy of the even verts into the odd spots
that is on the far light clip plane
===================
*/
static void R_ProjectPointsToFarPlane( const idRenderEntityLocal *ent, const idRenderLightLocal *light,
const idPlane &lightPlaneLocal,
int firstShadowVert, int numShadowVerts ) {
idVec3 lv;
idVec4 mat[4];
int i;
idVec4 *in;
R_GlobalPointToLocal( ent->modelMatrix, light->globalLightOrigin, lv );
R_LightProjectionMatrix( lv, lightPlaneLocal, mat );
#if 1
// make a projected copy of the even verts into the odd spots
in = &shadowVerts[firstShadowVert];
for ( i = firstShadowVert ; i < numShadowVerts ; i+= 2, in += 2 ) {
float w, oow;
in[0].w = 1;
w = in->ToVec3() * mat[3].ToVec3() + mat[3][3];
if ( w == 0 ) {
in[1] = in[0];
continue;
}
oow = 1.0 / w;
in[1].x = ( in->ToVec3() * mat[0].ToVec3() + mat[0][3] ) * oow;
in[1].y = ( in->ToVec3() * mat[1].ToVec3() + mat[1][3] ) * oow;
in[1].z = ( in->ToVec3() * mat[2].ToVec3() + mat[2][3] ) * oow;
in[1].w = 1;
}
#else
// messing with W seems to cause some depth precision problems
// make a projected copy of the even verts into the odd spots
in = &shadowVerts[firstShadowVert];
for ( i = firstShadowVert ; i < numShadowVerts ; i+= 2, in += 2 ) {
in[0].w = 1;
in[1].x = *in * mat[0].ToVec3() + mat[0][3];
in[1].y = *in * mat[1].ToVec3() + mat[1][3];
in[1].z = *in * mat[2].ToVec3() + mat[2][3];
in[1].w = *in * mat[3].ToVec3() + mat[3][3];
}
#endif
}
/*
===================
R_ProjectPointsToFarPlane
make a projected copy of the even verts into the odd spots
that is on the far light clip plane
===================
*/
static void R_ProjectPointsToFarPlane(stencilRef_t *st, const idRenderEntityLocal *ent, const idRenderLightLocal *light, const idPlane &lightPlaneLocal, int firstShadowVert, int numShadowVerts) {
idVec3 lv;
idVec4 mat[4];
int i;
idVec4 *in;
R_GlobalPointToLocal(ent->modelMatrix, light->globalLightOrigin, lv);
R_LightProjectionMatrix(lv, lightPlaneLocal, mat);
// make a projected copy of the even verts into the odd spots
in = &st->shadowVerts[firstShadowVert];
for (i = firstShadowVert; i < numShadowVerts; i += 2, in += 2) {
float w, oow;
in[0].w = 1.0f;
w = in->ToVec3() * mat[3].ToVec3() + mat[3][3];
if (w == 0) {
in[1] = in[0];
continue;
}
oow = 1.0f / w;
in[1].x = (in->ToVec3() * mat[0].ToVec3() + mat[0][3]) * oow;
in[1].y = (in->ToVec3() * mat[1].ToVec3() + mat[1][3]) * oow;
in[1].z = (in->ToVec3() * mat[2].ToVec3() + mat[2][3]) * oow;
in[1].w = 1;
}
}
