Moved FBO support from osgfbo example into core osg.
This commit is contained in:
Robert Osfield
346
src/osg/FrameBufferObject.cpp
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346
src/osg/FrameBufferObject.cpp
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@@ -0,0 +1,346 @@
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#include <osg/FrameBufferObject>
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#include <osg/State>
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#include <osg/GLExtensions>
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#include <osg/Texture1D>
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#include <osg/Texture2D>
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#include <osg/Texture3D>
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#include <osg/TextureCubeMap>
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#include <osg/TextureRectangle>
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#include <osg/Notify>
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using namespace osg;
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/**************************************************************************
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* FBOExtensions
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**************************************************************************/
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#define LOAD_FBO_EXT(name) name = (T##name *)getGLExtensionFuncPtr(#name);
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FBOExtensions::FBOExtensions(unsigned int contextID)
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: _supported(false)
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{
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if (!isGLExtensionSupported(contextID, "GL_EXT_framebuffer_object"))
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return;
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LOAD_FBO_EXT(glBindRenderbufferEXT);
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LOAD_FBO_EXT(glGenRenderbuffersEXT);
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LOAD_FBO_EXT(glRenderbufferStorageEXT);
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LOAD_FBO_EXT(glBindFramebufferEXT);
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LOAD_FBO_EXT(glGenFramebuffersEXT);
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LOAD_FBO_EXT(glCheckFramebufferStatusEXT);
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LOAD_FBO_EXT(glFramebufferTexture1DEXT);
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LOAD_FBO_EXT(glFramebufferTexture2DEXT);
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LOAD_FBO_EXT(glFramebufferTexture3DEXT);
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LOAD_FBO_EXT(glFramebufferRenderbufferEXT);
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LOAD_FBO_EXT(glGenerateMipmapEXT);
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_supported =
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glBindRenderbufferEXT != 0 &&
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glGenRenderbuffersEXT != 0 &&
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glRenderbufferStorageEXT != 0 &&
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glBindFramebufferEXT != 0 &&
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glGenFramebuffersEXT != 0 &&
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glCheckFramebufferStatusEXT != 0 &&
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glFramebufferTexture1DEXT != 0 &&
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glFramebufferTexture2DEXT != 0 &&
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glFramebufferTexture3DEXT != 0 &&
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glFramebufferRenderbufferEXT != 0 &&
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glGenerateMipmapEXT != 0;
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}
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/**************************************************************************
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* RenderBuffer
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**************************************************************************/
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RenderBuffer::RenderBuffer()
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: Object(),
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_internalFormat(GL_DEPTH_COMPONENT24),
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_width(512),
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_height(512)
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{
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}
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RenderBuffer::RenderBuffer(int width, int height, GLenum internalFormat)
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: Object(),
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_internalFormat(internalFormat),
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_width(width),
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_height(height)
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{
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}
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RenderBuffer::RenderBuffer(const RenderBuffer ©, const CopyOp ©op)
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: Object(copy, copyop),
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_internalFormat(copy._internalFormat),
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_width(copy._width),
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_height(copy._height)
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{
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}
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GLuint RenderBuffer::getObjectID(unsigned int contextID, const FBOExtensions *ext) const
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{
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GLuint &objectID = _objectID[contextID];
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int &dirty = _dirty[contextID];
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if (objectID == 0)
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{
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ext->glGenRenderbuffersEXT(1, &objectID);
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if (objectID == 0)
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return 0;
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dirty = 1;
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}
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if (dirty)
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{
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// bind and configure
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ext->glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, objectID);
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ext->glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, _internalFormat, _width, _height);
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dirty = 0;
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}
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return objectID;
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}
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/**************************************************************************
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* FrameBufferAttachement
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**************************************************************************/
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#ifndef GL_TEXTURE_CUBE_MAP_POSITIVE_X
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_X 0x8515
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#endif
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struct FrameBufferAttachment::Pimpl
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{
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enum TargetType
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{
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RENDERBUFFER,
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TEXTURE1D,
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TEXTURE2D,
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TEXTURE3D,
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TEXTURECUBE,
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TEXTURERECT
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};
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TargetType targetType;
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ref_ptr<RenderBuffer> renderbufferTarget;
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ref_ptr<Texture> textureTarget;
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int cubeMapFace;
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int level;
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int zoffset;
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explicit Pimpl(TargetType ttype = RENDERBUFFER, int lev = 0)
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: targetType(ttype),
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cubeMapFace(0),
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level(lev),
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zoffset(0)
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{
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}
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Pimpl(const Pimpl ©)
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: targetType(copy.targetType),
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renderbufferTarget(copy.renderbufferTarget),
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textureTarget(copy.textureTarget),
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cubeMapFace(copy.cubeMapFace),
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level(copy.level),
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zoffset(copy.zoffset)
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{
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}
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};
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FrameBufferAttachment::FrameBufferAttachment()
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{
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_ximpl = new Pimpl;
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}
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FrameBufferAttachment::FrameBufferAttachment(const FrameBufferAttachment ©)
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{
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_ximpl = new Pimpl(*copy._ximpl);
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}
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FrameBufferAttachment::FrameBufferAttachment(RenderBuffer* target)
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{
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_ximpl = new Pimpl(Pimpl::RENDERBUFFER);
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_ximpl->renderbufferTarget = target;
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}
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FrameBufferAttachment::FrameBufferAttachment(Texture1D* target, int level)
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{
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_ximpl = new Pimpl(Pimpl::TEXTURE1D, level);
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_ximpl->textureTarget = target;
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}
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FrameBufferAttachment::FrameBufferAttachment(Texture2D* target, int level)
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{
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_ximpl = new Pimpl(Pimpl::TEXTURE2D, level);
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_ximpl->textureTarget = target;
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}
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FrameBufferAttachment::FrameBufferAttachment(Texture3D* target, int level, int zoffset)
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{
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_ximpl = new Pimpl(Pimpl::TEXTURE3D, level);
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_ximpl->textureTarget = target;
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_ximpl->zoffset = zoffset;
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}
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FrameBufferAttachment::FrameBufferAttachment(TextureCubeMap* target, int face, int level)
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{
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_ximpl = new Pimpl(Pimpl::TEXTURECUBE, level);
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_ximpl->textureTarget = target;
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_ximpl->cubeMapFace = face;
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}
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FrameBufferAttachment::FrameBufferAttachment(TextureRectangle* target)
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{
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_ximpl = new Pimpl(Pimpl::TEXTURERECT);
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_ximpl->textureTarget = target;
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}
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FrameBufferAttachment::~FrameBufferAttachment()
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{
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delete _ximpl;
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}
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FrameBufferAttachment &FrameBufferAttachment::operator = (const FrameBufferAttachment ©)
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{
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delete _ximpl;
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_ximpl = new Pimpl(*copy._ximpl);
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return *this;
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}
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void FrameBufferAttachment::attach(State &state, GLenum attachment_point, const FBOExtensions* ext) const
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{
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unsigned int contextID = state.getContextID();
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// force compile texture if necessary
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Texture::TextureObject *tobj = 0;
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if (_ximpl->textureTarget.valid())
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{
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tobj = _ximpl->textureTarget->getTextureObject(contextID);
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if (!tobj || tobj->_id == 0)
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{
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_ximpl->textureTarget->compileGLObjects(state);
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tobj = _ximpl->textureTarget->getTextureObject(contextID);
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}
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if (!tobj || tobj->_id == 0)
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return;
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}
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switch (_ximpl->targetType)
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{
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default:
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case Pimpl::RENDERBUFFER:
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ext->glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_RENDERBUFFER_EXT, _ximpl->renderbufferTarget->getObjectID(contextID, ext));
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break;
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case Pimpl::TEXTURE1D:
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ext->glFramebufferTexture1DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_1D, tobj->_id, _ximpl->level);
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break;
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case Pimpl::TEXTURE2D:
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ext->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_2D, tobj->_id, _ximpl->level);
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break;
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case Pimpl::TEXTURE3D:
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ext->glFramebufferTexture3DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_3D, tobj->_id, _ximpl->level, _ximpl->zoffset);
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break;
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case Pimpl::TEXTURERECT:
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ext->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_RECTANGLE, tobj->_id, 0);
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break;
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case Pimpl::TEXTURECUBE:
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ext->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attachment_point, GL_TEXTURE_CUBE_MAP_POSITIVE_X + _ximpl->cubeMapFace, tobj->_id, _ximpl->level);
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break;
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}
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}
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int FrameBufferAttachment::compare(const FrameBufferAttachment &fa) const
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{
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if (&fa == this) return 0;
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if (_ximpl->targetType < fa._ximpl->targetType) return -1;
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if (_ximpl->targetType > fa._ximpl->targetType) return 1;
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if (_ximpl->renderbufferTarget.get() < fa._ximpl->renderbufferTarget.get()) return -1;
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if (_ximpl->renderbufferTarget.get() > fa._ximpl->renderbufferTarget.get()) return 1;
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if (_ximpl->textureTarget.get() < fa._ximpl->textureTarget.get()) return -1;
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if (_ximpl->textureTarget.get() > fa._ximpl->textureTarget.get()) return 1;
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if (_ximpl->cubeMapFace < fa._ximpl->cubeMapFace) return -1;
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if (_ximpl->cubeMapFace > fa._ximpl->cubeMapFace) return 1;
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if (_ximpl->level < fa._ximpl->level) return -1;
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if (_ximpl->level > fa._ximpl->level) return 1;
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if (_ximpl->zoffset < fa._ximpl->zoffset) return -1;
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if (_ximpl->zoffset > fa._ximpl->zoffset) return 1;
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return 0;
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}
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/**************************************************************************
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* FrameBufferObject
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**************************************************************************/
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FrameBufferObject::FrameBufferObject()
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: StateAttribute()
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{
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}
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FrameBufferObject::FrameBufferObject(const FrameBufferObject ©, const CopyOp ©op)
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: StateAttribute(copy, copyop),
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_attachments(copy._attachments)
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{
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}
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void FrameBufferObject::apply(State &state) const
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{
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unsigned int contextID = state.getContextID();
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if (_unsupported[contextID])
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return;
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FBOExtensions* ext = FBOExtensions::instance(contextID);
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if (!ext->isSupported())
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{
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_unsupported[contextID] = 1;
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notify(WARN) << "Warning: EXT_framebuffer_object is not supported" << std::endl;
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return;
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}
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if (_attachments.empty())
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{
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ext->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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return;
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}
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int &dirtyAttachmentList = _dirtyAttachmentList[contextID];
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GLuint &fboID = _fboID[contextID];
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if (fboID == 0)
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{
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ext->glGenFramebuffersEXT(1, &fboID);
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if (fboID == 0)
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{
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notify(WARN) << "Warning: FrameBufferObject: could not create the FBO" << std::endl;
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return;
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}
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dirtyAttachmentList = 1;
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}
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ext->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboID);
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if (dirtyAttachmentList)
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{
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for (AttachmentMap::const_iterator i=_attachments.begin(); i!=_attachments.end(); ++i)
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{
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const FrameBufferAttachment &fa = i->second;
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fa.attach(state, i->first, ext);
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}
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dirtyAttachmentList = 0;
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}
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}
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int FrameBufferObject::compare(const StateAttribute &sa) const
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{
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COMPARE_StateAttribute_Types(FrameBufferObject, sa);
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COMPARE_StateAttribute_Parameter(_attachments.size());
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AttachmentMap::const_iterator i = _attachments.begin();
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AttachmentMap::const_iterator j = rhs._attachments.begin();
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for (; i!=_attachments.end(); ++i, ++j)
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{
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int cmp = i->second.compare(j->second);
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if (cmp != 0) return cmp;
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}
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return 0;
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}
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