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+// Filename: parasiteBuffer.h
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+// Created by: drose (27Feb04)
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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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+// [email protected] .
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+//
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+////////////////////////////////////////////////////////////////////
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+
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+#ifndef PARASITEBUFFER_H
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+#define PARASITEBUFFER_H
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+
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+#include "pandabase.h"
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+
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+#include "graphicsOutput.h"
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+#include "texture.h"
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+#include "pointerTo.h"
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+
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+////////////////////////////////////////////////////////////////////
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+// Class : ParasiteBuffer
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+// Description : This is a special GraphicsOutput type that acts a lot
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+// like a GraphicsBuffer, effectively allowing rendering
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+// to an offscreen buffer, except it does not create any
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+// framebuffer space for itself. Instead, it renders
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+// into the framebuffer owned by some other
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+// GraphicsOutput.
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+//
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+// The x_size and y_size must therefore fit within the
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+// bounds of the source GraphicsOutput.
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+//
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+// Since the framebuffer will be subsequently cleared
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+// when the actual owner draws in it later, this only
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+// makes sense if we are going to copy the contents of
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+// the framebuffer to a texture immediately after we
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+// draw it. Thus, has_texture() is implicitly true for
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+// a ParasiteBuffer.
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+//
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+// This class is useful to render offscreen to a texture
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+// while preventing the waste of framebuffer memory for
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+// API's that are unable to render directly into a
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+// texture (and must render into a separate framebuffer
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+// first and then copy to texture). It is also the only
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+// way to render to a texture on API's that do not
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+// support offscreen rendering.
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+////////////////////////////////////////////////////////////////////
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+class EXPCL_PANDA ParasiteBuffer : public GraphicsOutput {
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+public:
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+ ParasiteBuffer(GraphicsOutput *host, const string &name,
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+ int x_size, int y_size);
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+
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+PUBLISHED:
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+ virtual ~ParasiteBuffer();
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+
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+ virtual bool is_active() const;
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+
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+public:
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+ virtual void make_current();
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+
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+private:
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+ PT(GraphicsOutput) _host;
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+
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+public:
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+ static TypeHandle get_class_type() {
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+ return _type_handle;
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+ }
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+ static void init_type() {
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+ GraphicsOutput::init_type();
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+ register_type(_type_handle, "ParasiteBuffer",
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+ GraphicsOutput::get_class_type());
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+ }
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+ virtual TypeHandle get_type() const {
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+ return get_class_type();
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+ }
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+ virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
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+
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+private:
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+ static TypeHandle _type_handle;
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+};
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+
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+#include "parasiteBuffer.I"
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+
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+#endif
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David Rose