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DRW: Culling: Expose & Add culling functions to engines.

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This way engines can do preemptive culling by themselves.
This commit is contained in:
Clément Foucault
2018-03-08 17:54:14 +01:00
parent 4402633e33
commit 7c31edb385
4 changed files with 45 additions and 10 deletions
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36
source/blender/draw/intern/draw_manager_exec.c
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@@ -530,11 +530,15 @@ static void draw_clipping_setup_from_view(void)
/* Transform to world space. */
mul_m4_v3(viewinv, bsphere->center);
}
DST.clipping.updated = true;
}
/* Return True if the given BoundSphere intersect the current view frustum */
static bool draw_culling_sphere_test(BoundSphere *bsphere)
bool DRW_culling_sphere_test(BoundSphere *bsphere)
{
draw_clipping_setup_from_view();
/* Bypass test if radius is negative. */
if (bsphere->radius < 0.0f)
return true;
@@ -556,6 +560,32 @@ static bool draw_culling_sphere_test(BoundSphere *bsphere)
return true;
}
/* Return True if the given BoundBox intersect the current view frustum.
* bbox must be in world space. */
bool DRW_culling_box_test(BoundBox *bbox)
{
draw_clipping_setup_from_view();
/* 6 view frustum planes */
for (int p = 0; p < 6; p++) {
/* 8 box vertices. */
for (int v = 0; v < 8 ; v++) {
float dist = plane_point_side_v3(DST.clipping.frustum_planes[p], bbox->vec[v]);
if (dist > 0.0f) {
/* At least one point in front of this plane.
* Go to next plane. */
break;
}
else if (v == 7) {
/* 8 points behind this plane. */
return false;
}
}
}
return true;
}
/** \} */
/* -------------------------------------------------------------------- */
@@ -572,7 +602,7 @@ static void draw_matrices_model_prepare(DRWCallState *st)
st->cache_id = DST.state_cache_id;
}
if (draw_culling_sphere_test(&st->bsphere)) {
if (DRW_culling_sphere_test(&st->bsphere)) {
st->flag &= ~DRW_CALL_CULLED;
}
else {
@@ -934,8 +964,6 @@ static void drw_draw_pass_ex(DRWPass *pass, DRWShadingGroup *start_group, DRWSha
}
}
DST.clipping.updated = false;
/* TODO dispatch threads to compute matrices/culling */
}