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+// Filename: scissorEffect.cxx
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+// Created by: drose (30Jul08)
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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) Carnegie Mellon University. All rights reserved.
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+//
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+// All use of this software is subject to the terms of the revised BSD
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+// license. You should have received a copy of this license along
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+// with this source code in a file named "LICENSE."
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+//
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+////////////////////////////////////////////////////////////////////
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+
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+#include "scissorEffect.h"
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+#include "scissorAttrib.h"
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+#include "cullTraverser.h"
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+#include "cullTraverserData.h"
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+#include "nodePath.h"
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+#include "bamReader.h"
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+#include "bamWriter.h"
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+#include "datagram.h"
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+#include "datagramIterator.h"
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+#include "boundingHexahedron.h"
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+
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+TypeHandle ScissorEffect::_type_handle;
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::Constructor
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+// Access: Private
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+// Description: Use ScissorEffect::make() to construct a new
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+// ScissorEffect object.
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+////////////////////////////////////////////////////////////////////
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+ScissorEffect::
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+ScissorEffect(bool screen, const LVecBase4f &frame,
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+ const LPoint3f *points, int num_points, bool clip) :
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+ _screen(screen), _frame(frame), _clip(clip)
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+{
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+ _points.reserve(num_points);
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+ for (int i = 0; i < num_points; ++i) {
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+ _points.push_back(points[i]);
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+ }
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::make_screen
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+// Access: Published, Static
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+// Description: Constructs a new screen-relative ScissorEffect. The
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+// frame defines a left, right, bottom, top region,
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+// relative to the DisplayRegion. See ScissorAttrib.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderEffect) ScissorEffect::
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+make_screen(const LVecBase4f &frame, bool clip) {
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+ ScissorEffect *effect = new ScissorEffect(true, frame, NULL, 0, clip);
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+ return return_new(effect);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::make_node
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+// Access: Published, Static
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+// Description: Constructs a new node-relative ScissorEffect. The
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+// two points are understood to be relative to the
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+// current node, and determine the diagonally opposite
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+// corners of the scissor region.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderEffect) ScissorEffect::
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+make_node(const LPoint3f &a, const LPoint3f &b, bool clip) {
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+ LPoint3f points[2];
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+ points[0] = a;
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+ points[1] = b;
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+ ScissorEffect *effect = new ScissorEffect(false, LVecBase4f::zero(), points, 2, clip);
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+ return return_new(effect);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::make_node
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+// Access: Published, Static
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+// Description: Constructs a new node-relative ScissorEffect. The
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+// four points are understood to be relative to the
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+// current node, and determine four points surrounding
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+// the scissor region.
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+////////////////////////////////////////////////////////////////////
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+CPT(RenderEffect) ScissorEffect::
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+make_node(const LPoint3f &a, const LPoint3f &b, const LPoint3f &c, const LPoint3f &d, bool clip) {
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+ LPoint3f points[4];
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+ points[0] = a;
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+ points[1] = b;
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+ points[2] = c;
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+ points[3] = d;
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+ ScissorEffect *effect = new ScissorEffect(false, LVecBase4f::zero(), points, 4, clip);
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+ return return_new(effect);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::safe_to_transform
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+// Access: Public, Virtual
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+// Description: Returns true if it is generally safe to transform
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+// this particular kind of RenderEffect by calling the
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+// xform() method, false otherwise.
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+////////////////////////////////////////////////////////////////////
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+bool ScissorEffect::
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+safe_to_transform() const {
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+ return false;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::output
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+// Access: Public, Virtual
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+void ScissorEffect::
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+output(ostream &out) const {
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+ out << get_type() << ":";
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+ if (is_screen()) {
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+ out << "screen [" << _frame << "]";
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+ } else {
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+ out << "node";
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+ Points::const_iterator pi;
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+ for (pi = _points.begin(); pi != _points.end(); ++pi) {
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+ out << " [" << (*pi) << "]";
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+ }
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+ }
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+ if (!get_clip()) {
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+ out << " !clip";
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+ }
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::has_cull_callback
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+// Access: Public, Virtual
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+// Description: Should be overridden by derived classes to return
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+// true if cull_callback() has been defined. Otherwise,
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+// returns false to indicate cull_callback() does not
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+// need to be called for this effect during the cull
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+// traversal.
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+////////////////////////////////////////////////////////////////////
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+bool ScissorEffect::
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+has_cull_callback() const {
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+ return true;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::cull_callback
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+// Access: Public, Virtual
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+// Description: If has_cull_callback() returns true, this function
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+// will be called during the cull traversal to perform
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+// any additional operations that should be performed at
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+// cull time. This may include additional manipulation
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+// of render state or additional visible/invisible
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+// decisions, or any other arbitrary operation.
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+//
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+// At the time this function is called, the current
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+// node's transform and state have not yet been applied
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+// to the net_transform and net_state. This callback
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+// may modify the node_transform and node_state to apply
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+// an effective change to the render state at this
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+// level.
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+////////////////////////////////////////////////////////////////////
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+void ScissorEffect::
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+cull_callback(CullTraverser *trav, CullTraverserData &data,
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+ CPT(TransformState) &node_transform,
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+ CPT(RenderState) &node_state) const {
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+ LVecBase4f frame;
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+ const Lens *lens = trav->get_scene()->get_lens();
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+ CPT(TransformState) modelview_transform = data.get_modelview_transform(trav)->compose(node_transform);
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+ if (modelview_transform->is_singular()) {
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+ // If we're under a singular transform, never mind.
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+ return;
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+ }
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+
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+ if (is_screen()) {
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+ frame = _frame;
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+ } else {
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+ const LMatrix4f &proj_mat = lens->get_projection_mat();
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+ LMatrix4f net_mat = modelview_transform->get_mat() * proj_mat;
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+
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+ bool any_points = false;
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+
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+ Points::const_iterator pi;
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+ for (pi = _points.begin(); pi != _points.end(); ++pi) {
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+ const LPoint3f &p = (*pi);
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+ LVecBase4f pv(p[0], p[1], p[2], 1.0f);
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+ pv = pv * net_mat;
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+ if (pv[3] == 0) {
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+ continue;
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+ }
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+ LPoint3f pr(pv[0] / pv[3], pv[1] / pv[3], pv[2] / pv[3]);
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+ if (!any_points) {
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+ frame[0] = pr[0];
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+ frame[1] = pr[0];
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+ frame[2] = pr[1];
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+ frame[3] = pr[1];
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+ any_points = true;
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+ } else {
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+ frame[0] = min(frame[0], pr[0]);
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+ frame[1] = max(frame[1], pr[0]);
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+ frame[2] = min(frame[2], pr[1]);
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+ frame[3] = max(frame[3], pr[1]);
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+ }
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+ }
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+
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+ // Scale from -1..1 to 0..1.
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+ frame[0] = (frame[0] + 1.0f) * 0.5f;
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+ frame[1] = (frame[1] + 1.0f) * 0.5f;
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+ frame[2] = (frame[2] + 1.0f) * 0.5f;
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+ frame[3] = (frame[3] + 1.0f) * 0.5f;
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+ }
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+
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+ // Impose bounding volumes.
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+ frame[0] = max(min(frame[0], 1.0f), 0.0f);
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+ frame[1] = max(min(frame[1], 1.0f), frame[0]);
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+ frame[2] = max(min(frame[2], 1.0f), 0.0f);
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+ frame[3] = max(min(frame[3], 1.0f), frame[2]);
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+
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+ if (_clip) {
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+ CPT(RenderAttrib) scissor_attrib = ScissorAttrib::make(frame);
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+ CPT(RenderState) state = RenderState::make(scissor_attrib);
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+ node_state = node_state->compose(state);
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+ }
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+
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+ // Set up the culling. We do this by extruding the four corners of
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+ // the frame into the eight corners of the bounding frustum.
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+ PT(GeometricBoundingVolume) frustum = make_frustum(lens, frame);
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+ if (frustum != (GeometricBoundingVolume *)NULL) {
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+ frustum->xform(modelview_transform->get_inverse()->get_mat());
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+ data._view_frustum = frustum;
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+ }
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::compare_to_impl
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+// Access: Protected, Virtual
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+// Description: Intended to be overridden by derived ScissorEffect
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+// types to return a unique number indicating whether
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+// this ScissorEffect is equivalent to the other one.
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+//
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+// This should return 0 if the two ScissorEffect objects
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+// are equivalent, a number less than zero if this one
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+// should be sorted before the other one, and a number
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+// greater than zero otherwise.
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+//
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+// This will only be called with two ScissorEffect
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+// objects whose get_type() functions return the same.
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+////////////////////////////////////////////////////////////////////
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+int ScissorEffect::
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+compare_to_impl(const RenderEffect *other) const {
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+ const ScissorEffect *ta;
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+ DCAST_INTO_R(ta, other, 0);
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+
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+ if (_screen != ta->_screen) {
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+ return (int)_screen - (int)ta->_screen;
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+ }
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+ if (_clip != ta->_clip) {
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+ return (int)_clip - (int)ta->_clip;
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+ }
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+ if (_screen) {
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+ int compare = _frame.compare_to(ta->_frame);
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+ if (compare != 0) {
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+ return compare;
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+ }
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+ } else {
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+ int compare = (int)_points.size() - (int)ta->_points.size();
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+ if (compare != 0) {
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+ return compare;
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+ }
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+ for (size_t i = 0; i < _points.size(); ++i) {
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+ compare = _points[i].compare_to(ta->_points[i]);
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+ if (compare != 0) {
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+ return compare;
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+ }
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+ }
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+ }
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+ return 0;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::register_with_read_factory
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+// Access: Public, Static
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+// Description: Tells the BamReader how to create objects of type
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+// ScissorEffect.
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+////////////////////////////////////////////////////////////////////
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+void ScissorEffect::
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+register_with_read_factory() {
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+ BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::write_datagram
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+// Access: Public, Virtual
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+// Description: Writes the contents of this object to the datagram
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+// for shipping out to a Bam file.
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+////////////////////////////////////////////////////////////////////
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+void ScissorEffect::
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+write_datagram(BamWriter *manager, Datagram &dg) {
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+ RenderEffect::write_datagram(manager, dg);
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+
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+ dg.add_bool(_screen);
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+ if (_screen) {
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+ _frame.write_datagram(dg);
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+ } else {
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+ dg.add_uint16(_points.size());
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+ Points::const_iterator pi;
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+ for (pi = _points.begin(); pi != _points.end(); ++pi) {
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+ (*pi).write_datagram(dg);
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+ }
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+ }
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+ dg.add_bool(_clip);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::make_from_bam
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+// Access: Protected, Static
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+// Description: This function is called by the BamReader's factory
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+// when a new object of type ScissorEffect is encountered
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+// in the Bam file. It should create the ScissorEffect
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+// and extract its information from the file.
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+////////////////////////////////////////////////////////////////////
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+TypedWritable *ScissorEffect::
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+make_from_bam(const FactoryParams ¶ms) {
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+ ScissorEffect *effect = new ScissorEffect(true, LVecBase4f::zero(), NULL, 0, false);
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+ DatagramIterator scan;
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+ BamReader *manager;
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+
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+ parse_params(params, scan, manager);
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+ effect->fillin(scan, manager);
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+
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+ return effect;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::fillin
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+// Access: Protected
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+// Description: This internal function is called by make_from_bam to
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+// read in all of the relevant data from the BamFile for
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+// the new ScissorEffect.
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+////////////////////////////////////////////////////////////////////
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+void ScissorEffect::
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+fillin(DatagramIterator &scan, BamReader *manager) {
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+ RenderEffect::fillin(scan, manager);
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+
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+ _screen = scan.get_bool();
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+ if (_screen) {
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+ _frame.read_datagram(scan);
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+ } else {
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+ int num_points = scan.get_uint16();
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+ _points.reserve(num_points);
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+ for (int i = 0; i < num_points; ++i) {
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+ LPoint3f p;
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+ p.read_datagram(scan);
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+ _points.push_back(p);
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+ }
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+ }
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+ _clip = scan.get_bool();
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: ScissorEffect::make_frustum
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+// Access: Private
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+// Description: Constructs a new bounding frustum from the lens
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+// properties, given the indicated scissor frame.
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+////////////////////////////////////////////////////////////////////
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+PT(GeometricBoundingVolume) ScissorEffect::
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+make_frustum(const Lens *lens, const LVecBase4f &frame) const{
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+ // Scale the frame from 0 .. 1 into -1 .. 1.
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+ LVecBase4f f2(frame[0] * 2.0f - 1.0f,
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+ frame[1] * 2.0f - 1.0f,
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+ frame[2] * 2.0f - 1.0f,
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+ frame[3] * 2.0f - 1.0f);
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+
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+ LPoint3f fll, flr, ful, fur;
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+ LPoint3f nll, nlr, nul, nur;
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+ LPoint2f corner;
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+
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+ corner[0] = f2[0]; corner[1] = f2[3];
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+
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+ // Upper left.
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+ if (!lens->extrude(corner, nul, ful)) {
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+ return (GeometricBoundingVolume *)NULL;
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+ }
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+
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+ corner[0] = f2[1]; corner[1] = f2[3];
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+
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+ // Upper right.
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+ if (!lens->extrude(corner, nur, fur)) {
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+ return (GeometricBoundingVolume *)NULL;
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+ }
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+
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+ corner[0] = f2[1]; corner[1] = f2[2];
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+
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+ // Lower right.
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+ if (!lens->extrude(corner, nlr, flr)) {
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+ return (GeometricBoundingVolume *)NULL;
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+ }
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+
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+ corner[0] = f2[0]; corner[1] = f2[2];
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+
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+ // Lower left.
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+ if (!lens->extrude(corner, nll, fll)) {
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+ return (GeometricBoundingVolume *)NULL;
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|
|
+ }
|
|
|
+
|
|
|
+ return new BoundingHexahedron(fll, flr, fur, ful, nll, nlr, nur, nul);
|
|
|
+}
|
David Rose