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panda/src/glstuff/glOcclusionQueryContext_src.I

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+// Filename: glOcclusionQueryContext_src.I
+// Created by:  drose (27Mar06)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
+//
+// All use of this software is subject to the terms of the Panda 3d
+// Software license.  You should have received a copy of this license
+// along with this source code; you will also find a current copy of
+// the license at http://etc.cmu.edu/panda3d/docs/license/ .
+//
+// To contact the maintainers of this program write to
+// panda3d-general@lists.sourceforge.net .
+//
+////////////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////////////
+//     Function: CLP(OcclusionQueryContext)::Constructor
+//       Access: Public
+//  Description:
+////////////////////////////////////////////////////////////////////
+INLINE CLP(OcclusionQueryContext)::
+CLP(OcclusionQueryContext)(GraphicsStateGuardian *gsg) {
+  _index = 0;
+  _gsg = gsg;
+}

panda/src/glstuff/glOcclusionQueryContext_src.cxx

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+// Filename: glOcclusionQueryContext_src.cxx
+// Created by:  drose (27Mar06)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
+//
+// All use of this software is subject to the terms of the Panda 3d
+// Software license.  You should have received a copy of this license
+// along with this source code; you will also find a current copy of
+// the license at http://etc.cmu.edu/panda3d/docs/license/ .
+//
+// To contact the maintainers of this program write to
+// panda3d-general@lists.sourceforge.net .
+//
+////////////////////////////////////////////////////////////////////
+
+#include "pnotify.h"
+#include "dcast.h"
+#include "mutexHolder.h"
+
+TypeHandle CLP(OcclusionQueryContext)::_type_handle;
+
+////////////////////////////////////////////////////////////////////
+//     Function: GLOcclusionQueryContext::Destructor
+//       Access: Public, Virtual
+//  Description:
+////////////////////////////////////////////////////////////////////
+CLP(OcclusionQueryContext)::
+~CLP(OcclusionQueryContext)() {
+  if (_index != 0) {
+    // Tell the GSG to recycle this index when it gets around to it.
+    CLP(GraphicsStateGuardian) *glgsg;
+    DCAST_INTO_V(glgsg, _gsg);
+    MutexHolder holder(glgsg->_lock);
+    glgsg->_deleted_queries.push_back(_index);
+
+    _index = 0;
+  }
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: GLOcclusionQueryContext::is_answer_ready
+//       Access: Public, Virtual
+//  Description: Returns true if the query's answer is ready, false
+//               otherwise.  If this returns false, the application
+//               must continue to poll until it returns true.
+//
+//               It is only valid to call this from the draw thread.
+////////////////////////////////////////////////////////////////////
+bool CLP(OcclusionQueryContext)::
+is_answer_ready() const {
+  CLP(GraphicsStateGuardian) *glgsg;
+  DCAST_INTO_R(glgsg, _gsg, false);
+  GLuint result;
+  glgsg->_glGetQueryObjectuiv(_index, GL_QUERY_RESULT_AVAILABLE, &result);
+  return (result != 0);
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: GLOcclusionQueryContext::waiting_for_answer
+//       Access: Public, Virtual
+//  Description: Requests the graphics engine to expedite the pending
+//               answer--the application is now waiting until the
+//               answer is ready.
+//
+//               It is only valid to call this from the draw thread.
+////////////////////////////////////////////////////////////////////
+void CLP(OcclusionQueryContext)::
+waiting_for_answer() {
+  GLP(Flush)();
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: GLOcclusionQueryContext::get_num_fragments
+//       Access: Public, Virtual
+//  Description: Returns the number of fragments (pixels) of the
+//               specified geometry that passed the depth test.
+//               If is_answer_ready() did not return true, this
+//               function may block before it returns.
+//
+//               It is only valid to call this from the draw thread.
+////////////////////////////////////////////////////////////////////
+int CLP(OcclusionQueryContext)::
+get_num_fragments() const {
+  CLP(GraphicsStateGuardian) *glgsg;
+  DCAST_INTO_R(glgsg, _gsg, 0);
+  GLuint result;
+  glgsg->_glGetQueryObjectuiv(_index, GL_QUERY_RESULT, &result);
+  return result;
+}

panda/src/glstuff/glOcclusionQueryContext_src.h

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+// Filename: glOcclusionQueryContext_src.h
+// Created by:  drose (27Mar06)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
+//
+// All use of this software is subject to the terms of the Panda 3d
+// Software license.  You should have received a copy of this license
+// along with this source code; you will also find a current copy of
+// the license at http://etc.cmu.edu/panda3d/docs/license/ .
+//
+// To contact the maintainers of this program write to
+// panda3d-general@lists.sourceforge.net .
+//
+////////////////////////////////////////////////////////////////////
+
+#include "pandabase.h"
+#include "occlusionQueryContext.h"
+
+class GraphicsStateGuardian;
+
+////////////////////////////////////////////////////////////////////
+//       Class : GLOcclusionQueryContext
+// Description :
+////////////////////////////////////////////////////////////////////
+class EXPCL_GL CLP(OcclusionQueryContext) : public OcclusionQueryContext {
+public:
+  INLINE CLP(OcclusionQueryContext)(GraphicsStateGuardian *gsg);
+  virtual ~CLP(OcclusionQueryContext)();
+
+  virtual bool is_answer_ready() const;
+  virtual void waiting_for_answer();
+  virtual int get_num_fragments() const;
+
+  GLuint _index;
+  GraphicsStateGuardian *_gsg;
+
+public:
+  static TypeHandle get_class_type() {
+    return _type_handle;
+  }
+  static void init_type() {
+    OcclusionQueryContext::init_type();
+    register_type(_type_handle, CLASSPREFIX_QUOTED "OcclusionQueryContext",
+                  OcclusionQueryContext::get_class_type());
+  }
+  virtual TypeHandle get_type() const {
+    return get_class_type();
+  }
+  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
+
+private:
+  static TypeHandle _type_handle;
+};
+
+#include "glOcclusionQueryContext_src.I"
+