From 87a7fd85bf97d6724c73810ff07fa098d5af9c54 Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Wed, 20 Apr 2005 23:43:43 +0000
Subject: [PATCH] qpgeom supports collide-with-geom

---
 panda/src/collide/collisionTraverser.cxx | 65 +++++++++++++++++++-----
 1 file changed, 51 insertions(+), 14 deletions(-)

diff --git a/panda/src/collide/collisionTraverser.cxx b/panda/src/collide/collisionTraverser.cxx
index 9c797595eb..38eb3eee44 100644
--- a/panda/src/collide/collisionTraverser.cxx
+++ b/panda/src/collide/collisionTraverser.cxx
@@ -27,6 +27,9 @@
 #include "transformState.h"
 #include "geomNode.h"
 #include "geom.h"
+#include "qpgeom.h"
+#include "qpgeomTriangles.h"
+#include "qpgeomVertexReader.h"
 #include "lodNode.h"
 #include "nodePath.h"
 #include "pStatTimer.h"
@@ -738,21 +741,55 @@ compare_collider_to_geom(CollisionEntry &entry, const Geom *geom,
     ci = _colliders.find(entry.get_from_node_path());
     nassertv(ci != _colliders.end());
 
-    PTA_Vertexf coords;
-    PTA_ushort vindex;
-    geom->get_coords(coords, vindex);
-    PTA_ushort tris = geom->get_tris();
+    if (geom->is_of_type(qpGeom::get_class_type())) {
+      const qpGeom *qpgeom = DCAST(qpGeom, geom);
+      if (qpgeom->get_primitive_type() == qpGeom::PT_polygons) {
+        const qpGeomVertexData *data =qpgeom->get_vertex_data();
+        qpGeomVertexReader vertex(data, InternalName::get_vertex());
 
-    for (int i = 0; i < (int)tris.size(); i += 3) {
-      if (CollisionPolygon::verify_points(coords[tris[i]],
-                                          coords[tris[i + 1]],
-                                          coords[tris[i + 2]])) {
-        // Generate a temporary CollisionPolygon on the fly for each
-        // triangle in the Geom.
-        entry._into =
-          new CollisionPolygon(coords[tris[i]], coords[tris[i + 1]],
-                               coords[tris[i + 2]]);
-        entry.test_intersection((*ci).second, this);
+        int num_primitives = qpgeom->get_num_primitives();
+        for (int i = 0; i < num_primitives; ++i) {
+          const qpGeomPrimitive *primitive = qpgeom->get_primitive(i);
+          CPT(qpGeomPrimitive) tris = primitive->decompose();
+          nassertv(tris->is_of_type(qpGeomTriangles::get_class_type()));
+          int num_vertices = tris->get_num_vertices();
+          nassertv((num_vertices % 3) == 0);
+
+          for (int vi = 0; vi < num_vertices; vi += 3) {
+            vertex.set_row(tris->get_vertex(vi));
+            Vertexf v0 = vertex.get_data3f();
+            vertex.set_row(tris->get_vertex(vi + 1));
+            Vertexf v1 = vertex.get_data3f();
+            vertex.set_row(tris->get_vertex(vi + 2));
+            Vertexf v2 = vertex.get_data3f();
+
+            // Generate a temporary CollisionPolygon on the fly for
+            // each triangle in the Geom.
+            if (CollisionPolygon::verify_points(v0, v1, v2)) {
+              entry._into = new CollisionPolygon(v0, v1, v2);
+              entry.test_intersection((*ci).second, this);
+            }
+          }
+        }
+      }
+
+    } else {
+      PTA_Vertexf coords;
+      PTA_ushort vindex;
+      geom->get_coords(coords, vindex);
+      PTA_ushort tris = geom->get_tris();
+      
+      for (int i = 0; i < (int)tris.size(); i += 3) {
+        if (CollisionPolygon::verify_points(coords[tris[i]],
+                                            coords[tris[i + 1]],
+                                            coords[tris[i + 2]])) {
+          // Generate a temporary CollisionPolygon on the fly for each
+          // triangle in the Geom.
+          entry._into =
+            new CollisionPolygon(coords[tris[i]], coords[tris[i + 1]],
+                                 coords[tris[i + 2]]);
+          entry.test_intersection((*ci).second, this);
+        }
       }
     }
   }