126 lines
4.4 KiB
C++
126 lines
4.4 KiB
C++
// Filename: glGraphicsBuffer_src.h
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// Created by: jyelon (15Jan06)
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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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#include "pandabase.h"
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#include "graphicsBuffer.h"
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////////////////////////////////////////////////////////////////////
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// Class : glGraphicsBuffer
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// Description : An offscreen render buffer.
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//
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// The glGraphicsBuffer is based on the OpenGL
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// EXT_framebuffer_object and ARB_draw_buffers extensions.
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// This design has significant advantages over the
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// older wglGraphicsBuffer and glxGraphicsBuffer:
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//
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// * Can export depth and stencil.
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// * Supports auxiliary bitplanes.
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// * Supports non-power-of-two padding.
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// * Supports tracking of host window size.
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// * Supports cumulative render-to-texture.
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// * Faster than pbuffers.
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// * Can render onto a texture without clearing it first.
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//
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// Some of these deserve a little explanation.
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// Auxiliary bitplanes are additional bitplanes above
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// and beyond the normal depth,stencil,color. One can
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// use them to render out multiple textures in a single
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// pass. Cumulative render-to-texture means that if
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// don't clear the buffer, then the contents of the
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// buffer will be equal to the texture's previous
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// contents. This alo means you can meaningfully
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// share a bitplane between two buffers by binding
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// the same texture to both buffers.
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//
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// If either of the necessary OpenGL extensions is not
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// available, then the glGraphicsBuffer will not be
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// available (although it may still be possible to
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// create a wglGraphicsBuffer or glxGraphicsBuffer).
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//
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////////////////////////////////////////////////////////////////////
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class EXPCL_GL CLP(GraphicsBuffer) : public GraphicsBuffer {
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public:
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CLP(GraphicsBuffer)(GraphicsEngine *engine, GraphicsPipe *pipe,
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const string &name,
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const FrameBufferProperties &fb_prop,
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const WindowProperties &win_prop,
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int flags,
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GraphicsStateGuardian *gsg,
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GraphicsOutput *host);
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virtual ~CLP(GraphicsBuffer)();
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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 void select_cube_map(int cube_map_index);
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virtual bool share_depth_buffer(GraphicsOutput *graphics_output);
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virtual void unshare_depth_buffer();
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void register_shared_depth_buffer(GraphicsOutput *graphics_output);
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void unregister_shared_depth_buffer(GraphicsOutput *graphics_output);
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protected:
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virtual void close_buffer();
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virtual bool open_buffer();
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void check_host_valid();
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void report_my_errors(int line, const char *file);
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private:
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void bind_slot(bool rb_resize, Texture **attach,
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RenderTexturePlane plane, GLenum attachpoint);
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bool check_fbo();
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void generate_mipmaps();
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void rebuild_bitplanes();
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GLuint _fbo;
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int _rb_size_x;
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int _rb_size_y;
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int _cube_face_active;
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PT(Texture) _tex[RTP_COUNT];
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GLuint _rb[RTP_COUNT];
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GLenum _attach_point[RTP_COUNT];
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GLuint _cubemap_fbo [6];
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CLP(GraphicsBuffer) *_shared_depth_buffer;
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list <CLP(GraphicsBuffer) *> _shared_depth_buffer_list;
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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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GraphicsBuffer::init_type();
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register_type(_type_handle, CLASSPREFIX_QUOTED "GraphicsBuffer",
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GraphicsBuffer::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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friend class CLP(GraphicsStateGuardian);
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};
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#include "glGraphicsBuffer_src.I"
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