188 lines
7.2 KiB
C++
188 lines
7.2 KiB
C++
// Filename: cullTraverserData.cxx
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// Created by: drose (06Mar02)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "cullTraverserData.h"
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#include "cullTraverser.h"
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#include "config_pgraph.h"
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#include "pandaNode.h"
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#include "colorAttrib.h"
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#include "textureAttrib.h"
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#include "renderModeAttrib.h"
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#include "billboardEffect.h"
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#include "compassEffect.h"
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#include "polylightEffect.h"
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#include "renderState.h"
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////////////////////////////////////////////////////////////////////
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// Function: CullTraverserData::apply_transform_and_state
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// Access: Public
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// Description: Applies the transform and state from the current
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// node onto the current data. This also evaluates
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// billboards, etc.
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////////////////////////////////////////////////////////////////////
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void CullTraverserData::
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apply_transform_and_state(CullTraverser *trav) {
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PandaNode *node = _node_path.node();
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CPT(RenderState) node_state = node->get_state();
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if (trav->has_tag_state_key() && node->has_tag(trav->get_tag_state_key())) {
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// Here's a node that has been tagged with the special key for our
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// current camera. This indicates some special state transition
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// for this node, which is unique to this camera.
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const Camera *camera = trav->get_scene()->get_camera_node();
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string tag_state = node->get_tag(trav->get_tag_state_key());
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node_state = node_state->compose(camera->get_tag_state(tag_state));
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}
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apply_transform_and_state(trav, node->get_transform(),
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node_state, node->get_effects());
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullTraverserData::apply_specific_transform
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// Access: Public
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// Description: Applies the indicated transform and state changes
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// (e.g. as extracted from a node) onto the current
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// data. This also evaluates billboards, etc.
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////////////////////////////////////////////////////////////////////
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void CullTraverserData::
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apply_transform_and_state(CullTraverser *trav,
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CPT(TransformState) node_transform,
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CPT(RenderState) node_state,
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CPT(RenderEffects) node_effects) {
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if (node_effects->has_cull_callback()) {
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node_effects->cull_callback(trav, *this, node_transform, node_state);
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}
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if (!node_transform->is_identity()) {
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_net_transform = _net_transform->compose(node_transform);
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_render_transform = _render_transform->compose(node_transform);
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if ((_view_frustum != (GeometricBoundingVolume *)NULL) ||
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(_guard_band != (GeometricBoundingVolume *)NULL)) {
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// We need to move the viewing frustums into the node's
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// coordinate space by applying the node's inverse transform.
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if (node_transform->is_singular()) {
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// But we can't invert a singular transform! Instead of
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// trying, we'll just give up on frustum culling from this
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// point down.
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_view_frustum = (GeometricBoundingVolume *)NULL;
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_guard_band = (GeometricBoundingVolume *)NULL;
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} else {
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CPT(TransformState) inv_transform =
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node_transform->invert_compose(TransformState::make_identity());
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// Copy the bounding volumes for the frustums so we can
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// transform them.
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if (_view_frustum != (GeometricBoundingVolume *)NULL) {
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_view_frustum = DCAST(GeometricBoundingVolume, _view_frustum->make_copy());
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_view_frustum->xform(inv_transform->get_mat());
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}
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if (_guard_band != (GeometricBoundingVolume *)NULL) {
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_guard_band = DCAST(GeometricBoundingVolume, _guard_band->make_copy());
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_guard_band->xform(inv_transform->get_mat());
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}
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}
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}
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}
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_state = _state->compose(node_state);
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullTraverserData::is_in_view_impl
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// Access: Private
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// Description: The private implementation of is_in_view().
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////////////////////////////////////////////////////////////////////
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bool CullTraverserData::
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is_in_view_impl() {
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// By the time we get here, we know we have a viewing frustum.
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nassertr(_view_frustum != (GeometricBoundingVolume *)NULL, true);
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const BoundingVolume &node_volume = node()->get_bound();
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nassertr(node_volume.is_of_type(GeometricBoundingVolume::get_class_type()), false);
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const GeometricBoundingVolume *node_gbv =
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DCAST(GeometricBoundingVolume, &node_volume);
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int result = _view_frustum->contains(node_gbv);
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if (pgraph_cat.is_spam()) {
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pgraph_cat.spam()
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<< _node_path << " cull result = " << hex << result << dec << "\n";
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}
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if (result == BoundingVolume::IF_no_intersection) {
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// No intersection at all. Cull.
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if (!fake_view_frustum_cull) {
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return false;
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}
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// If we have fake view-frustum culling enabled, instead of
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// actually culling an object we simply force it to be drawn in
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// red wireframe.
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_view_frustum = (GeometricBoundingVolume *)NULL;
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CPT(RenderState) fake_state = get_fake_view_frustum_cull_state();
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_state = _state->compose(fake_state);
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} else if ((result & BoundingVolume::IF_all) != 0) {
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// The node and its descendants are completely enclosed within
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// the frustum. No need to cull further.
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_view_frustum = (GeometricBoundingVolume *)NULL;
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} else {
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if (node()->is_final()) {
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// The bounding volume is partially, but not completely,
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// within the viewing frustum. Normally we'd keep testing
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// child bounding volumes as we continue down. But this node
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// has the "final" flag, so the user is claiming that there is
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// some important reason we should consider everything visible
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// at this point. So be it.
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_view_frustum = (GeometricBoundingVolume *)NULL;
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}
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}
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: CullTraverserData::get_fake_view_frustum_cull_state
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// Access: Private, Static
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// Description: Returns a RenderState for rendering stuff in red
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// wireframe, strictly for the fake_view_frustum_cull
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// effect.
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////////////////////////////////////////////////////////////////////
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CPT(RenderState) CullTraverserData::
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get_fake_view_frustum_cull_state() {
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// Once someone asks for this pointer, we hold its reference count
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// and never free it.
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static CPT(RenderState) state = (const RenderState *)NULL;
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if (state == (const RenderState *)NULL) {
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state = RenderState::make
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(ColorAttrib::make_flat(Colorf(1.0f, 0.0f, 0.0f, 1.0f)),
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TextureAttrib::make_all_off(),
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RenderModeAttrib::make(RenderModeAttrib::M_wireframe),
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RenderState::get_max_priority());
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}
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return state;
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}
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