97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
// 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) 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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#ifndef PARASITEBUFFER_H
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#define PARASITEBUFFER_H
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#include "pandabase.h"
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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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// 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_DISPLAY 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, int flags);
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PUBLISHED:
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virtual ~ParasiteBuffer();
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virtual bool is_active() const;
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void set_size(int x, int y);
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public:
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void set_size_and_recalc(int x, int y);
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virtual bool flip_ready() const;
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virtual void begin_flip();
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virtual void ready_flip();
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virtual void end_flip();
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virtual bool begin_frame(FrameMode mode, Thread *current_thread);
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virtual void end_frame(FrameMode mode, Thread *current_thread);
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virtual GraphicsOutput *get_host();
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private:
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int _creation_flags;
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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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private:
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static TypeHandle _type_handle;
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};
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#include "parasiteBuffer.I"
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#endif
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