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218 lines
8.3 KiB
C++
218 lines
8.3 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 OpenGl_FrameBuffer;
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DEFINE_STANDARD_HANDLE(OpenGl_FrameBuffer, OpenGl_Resource)
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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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static const GLuint NO_RENDERBUFFER = 0;
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public:
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//! Empty constructor
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Standard_EXPORT OpenGl_FrameBuffer();
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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) Standard_OVERRIDE;
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//! Number of multisampling samples.
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GLsizei NbSamples() const
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{
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return myNbSamples;
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}
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//! Return true if FBO has been created with color attachment.
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bool HasColor() const
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{
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return myColorFormat != 0;
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}
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//! Return true if FBO has been created with depth attachment.
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bool HasDepth() const
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{
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return myDepthFormat != 0;
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}
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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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//! Initialize FBO for rendering into textures.
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//! @param theGlCtx currently bound OpenGL context
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//! @param theSizeX texture width
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//! @param theSizeY texture height
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//! @param theColorFormat color texture sized format (0 means no color attachment), e.g. GL_RGBA8
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//! @param theDepthFormat depth-stencil texture sized format (0 means no depth attachment), e.g. GL_DEPTH24_STENCIL8
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//! @param theNbSamples MSAA number of samples (0 means normal texture)
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//! @return true on success
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Standard_EXPORT Standard_Boolean Init (const Handle(OpenGl_Context)& theGlCtx,
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const GLsizei theSizeX,
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const GLsizei theSizeY,
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const GLint theColorFormat,
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const GLint theDepthFormat,
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const GLsizei theNbSamples = 0);
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//! (Re-)initialize FBO with specified dimensions.
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Standard_EXPORT Standard_Boolean InitLazy (const Handle(OpenGl_Context)& theGlCtx,
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const GLsizei theViewportSizeX,
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const GLsizei theViewportSizeY,
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const GLint theColorFormat,
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const GLint theDepthFormat,
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const GLsizei theNbSamples = 0);
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//! (Re-)initialize FBO with properties taken from another FBO.
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Standard_Boolean InitLazy (const Handle(OpenGl_Context)& theGlCtx,
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const OpenGl_FrameBuffer& theFbo)
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{
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return InitLazy (theGlCtx, theFbo.myVPSizeX, theFbo.myVPSizeY, theFbo.myColorFormat, theFbo.myDepthFormat, theFbo.myNbSamples);
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}
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//! (Re-)initialize FBO with specified dimensions.
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//! The Render Buffer Objects will be used for Color, Depth and Stencil attachments (as opposite to textures).
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//! @param theGlCtx currently bound OpenGL context
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//! @param theSizeX render buffer width
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//! @param theSizeY render buffer height
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//! @param theColorFormat color render buffer sized format, e.g. GL_RGBA8
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//! @param theDepthFormat depth-stencil render buffer sized format, e.g. GL_DEPTH24_STENCIL8
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//! @param theColorRBufferFromWindow when specified - should be ID of already initialized RB object, which will be released within this class
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Standard_EXPORT Standard_Boolean InitWithRB (const Handle(OpenGl_Context)& theGlCtx,
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const GLsizei theSizeX,
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const GLsizei theSizeY,
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const GLint theColorFormat,
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const GLint theDepthFormat,
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const GLuint theColorRBufferFromWindow = 0);
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//! Initialize class from currently bound FBO.
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//! Retrieved OpenGL objects will not be destroyed on Release.
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Standard_EXPORT Standard_Boolean InitWrapper (const Handle(OpenGl_Context)& theGlCtx);
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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 for drawing and reading (to render into the texture).
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Standard_EXPORT virtual void BindBuffer (const Handle(OpenGl_Context)& theGlCtx);
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//! Bind frame buffer for drawing GL_DRAW_FRAMEBUFFER (to render into the texture).
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Standard_EXPORT virtual void BindDrawBuffer (const Handle(OpenGl_Context)& theGlCtx);
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//! Bind frame buffer for reading GL_READ_FRAMEBUFFER
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Standard_EXPORT virtual void BindReadBuffer (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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//! Returns the color Render Buffer.
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GLuint ColorRenderBuffer() const
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{
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return myGlColorRBufferId;
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}
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//! Returns the depth Render Buffer.
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GLuint DepthStencilRenderBuffer() const
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{
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return myGlDepthRBufferId;
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}
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protected:
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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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GLsizei myNbSamples; //!< number of MSAA samples
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GLint myColorFormat; //!< sized format for color texture, GL_RGBA8 by default
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GLint myDepthFormat; //!< sized format for depth-stencil texture, GL_DEPTH24_STENCIL8 by default
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GLuint myGlFBufferId; //!< FBO object ID
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GLuint myGlColorRBufferId; //!< color Render Buffer object (alternative to myColorTexture)
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GLuint myGlDepthRBufferId; //!< depth-stencil Render Buffer object (alternative to myDepthStencilTexture)
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bool myIsOwnBuffer; //!< flag indicating that FBO should be deallocated by this class
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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_RTTIEXT(OpenGl_FrameBuffer,OpenGl_Resource) // Type definition
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};
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#endif // OPENGL_FRAME_BUFFER_H
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