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https://git.dev.opencascade.org/repos/occt.git
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10b9c7dfc0
OpenGl_Element destruction and resource deallocation methods now accept a pointer to OpenGl_Context instead of a handle to avoid double deletion of the context.
141 lines
4.2 KiB
C++
141 lines
4.2 KiB
C++
// Created by: Kirill GAVRILOV
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// Copyright (c) 2011-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef OPENGL_FRAME_BUFFER_H
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#define OPENGL_FRAME_BUFFER_H
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#include <OpenGl_Context.hxx>
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#include <OpenGl_Resource.hxx>
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#include <OpenGl_Texture.hxx>
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#include <Standard_Boolean.hxx>
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#include <InterfaceGraphic.hxx>
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//! Class implements FrameBuffer Object (FBO) resource
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//! intended for off-screen rendering.
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class OpenGl_FrameBuffer : public OpenGl_Resource
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{
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public:
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//! Helpful constants
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static const GLuint NO_FRAMEBUFFER = 0;
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public:
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//! Empty constructor
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Standard_EXPORT OpenGl_FrameBuffer (GLint theTextureFormat = GL_RGBA8);
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//! Destructor
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Standard_EXPORT virtual ~OpenGl_FrameBuffer();
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//! Destroy object - will release GPU memory if any.
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Standard_EXPORT virtual void Release (OpenGl_Context* theGlCtx);
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//! Textures width.
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GLsizei GetSizeX() const
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{
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return myColorTexture->SizeX();
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}
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//! Textures height.
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GLsizei GetSizeY() const
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{
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return myColorTexture->SizeY();
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}
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//! Viewport width.
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GLsizei GetVPSizeX() const
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{
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return myVPSizeX;
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}
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//! Viewport height.
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GLsizei GetVPSizeY() const
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{
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return myVPSizeY;
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}
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//! Returns true if current object was initialized
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Standard_Boolean IsValid() const
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{
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return isValidFrameBuffer();
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}
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//! Notice! Obsolete hardware (GeForce FX etc)
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//! doesn't support rectangular textures!
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//! There are 3 possible results if you are trying
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//! to create non power-of-two FBO on these cards:
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//! 1) FBO creation will fail,
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//! current implementation will try to generate compatible FBO;
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//! 2) FBO rendering will be done in software mode (ForceWare 'hack');
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//! 3) FBO rendering will be incorrect (some obsolete Catalyst drivers).
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Standard_EXPORT Standard_Boolean Init (const Handle(OpenGl_Context)& theGlCtx,
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const GLsizei theViewportSizeX,
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const GLsizei theViewportSizeY);
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//! Setup viewport to render into FBO
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Standard_EXPORT void SetupViewport (const Handle(OpenGl_Context)& theGlCtx);
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//! Override viewport settings
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Standard_EXPORT void ChangeViewport (const GLsizei theVPSizeX,
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const GLsizei theVPSizeY);
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//! Bind frame buffer (to render into the texture).
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Standard_EXPORT virtual void BindBuffer (const Handle(OpenGl_Context)& theGlCtx);
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//! Unbind frame buffer.
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Standard_EXPORT virtual void UnbindBuffer (const Handle(OpenGl_Context)& theGlCtx);
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//! Returns the color texture.
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inline const Handle(OpenGl_Texture)& ColorTexture() const
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{
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return myColorTexture;
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}
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//! Returns the depth-stencil texture.
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inline const Handle(OpenGl_Texture)& DepthStencilTexture() const
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{
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return myDepthStencilTexture;
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}
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protected:
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//! Generate textures with undefined data
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Standard_Boolean initTrashTextures (const Handle(OpenGl_Context)& theGlContext);
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Standard_Boolean isValidFrameBuffer() const
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{
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return myGlFBufferId != NO_FRAMEBUFFER;
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}
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protected:
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GLsizei myVPSizeX; //!< viewport width (should be <= texture width)
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GLsizei myVPSizeY; //!< viewport height (should be <= texture height)
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GLint myTextFormat; //!< GL_RGB, GL_RGBA,...
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GLuint myGlFBufferId; //!< FBO object ID
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Handle(OpenGl_Texture) myColorTexture; //!< color texture object
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Handle(OpenGl_Texture) myDepthStencilTexture; //!< depth-stencil texture object
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public:
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DEFINE_STANDARD_RTTI(OpenGl_FrameBuffer) // Type definition
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};
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DEFINE_STANDARD_HANDLE(OpenGl_FrameBuffer, OpenGl_Resource)
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#endif // OPENGL_FRAME_BUFFER_H
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