Hi,
In the "apply" method of osg::FrameBufferObject, the draw buffers are always
enabled, even if the target is only "READ_FRAMEBUFFER".
This can lead to inconsistency if you bind a framebuffer with multiple
attachments in DRAW mode and then a framebuffer with different attachment count
in READ mode (for example to manually "blit" from a FBo to another).
On some ATI cards (at least RADEON HD) this also leads to an "incomplete " FBO
status
I've added a test to enable drawbuffers only if target is "DRAW" or
"READ_DRAW", this solves my problems on ATI cards.
I've also added a "glCheckFramebufferStatus" call (this is how I discovered the
origin of my problem), but I'm not sure if this is realy a great idea because
it may lead to a complete OpenGL pipeline stall to check the FBO status.
Cheers,
Aurelien
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=57396#57396
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
// initial FBO support written by Marco Jez, June 2005.
#include <osg/FrameBufferObject>
#include <osg/State>
#include <osg/GLExtensions>
#include <osg/Texture1D>
#include <osg/Texture2D>
#include <osg/Texture2DMultisample>
#include <osg/Texture3D>
#include <osg/Texture2DArray>
#include <osg/TextureCubeMap>
#include <osg/TextureRectangle>
#include <osg/Notify>
#include <osg/Timer>
using namespace osg;
static buffered_object< ref_ptr<FBOExtensions> > s_extensions;
FBOExtensions* FBOExtensions::instance(unsigned contextID, bool
createIfNotInitalized)
{
if (!s_extensions[contextID] && createIfNotInitalized)
s_extensions[contextID] = new FBOExtensions(contextID);
return s_extensions[contextID].get();
}
/**************************************************************************
* FBOExtensions
**************************************************************************/
#if defined(OSG_GLES1_AVAILABLE) || defined(OSG_GLES2_AVAILABLE)
#if defined(OSG_GLES1_AVAILABLE)
#define LOAD_FBO_EXT(name) setGLExtensionFuncPtr(name, (#name),
(std::string(#name)+std::string("OES") ).c_str() )
#else
#define LOAD_FBO_EXT(name) setGLExtensionFuncPtr(name, (#name),
std::string(#name).c_str() )
#endif
#else
#define LOAD_FBO_EXT(name) setGLExtensionFuncPtr(name, (#name),
(std::string(#name)+std::string("EXT") ).c_str() )
#endif
FBOExtensions::FBOExtensions(unsigned int contextID)
: glBindRenderbuffer(0),
glGenRenderbuffers(0),
glDeleteRenderbuffers(0),
glRenderbufferStorage(0),
glRenderbufferStorageMultisample(0),
glRenderbufferStorageMultisampleCoverageNV(0),
glBindFramebuffer(0),
glDeleteFramebuffers(0),
glGenFramebuffers(0),
glCheckFramebufferStatus(0),
glFramebufferTexture1D(0),
glFramebufferTexture2D(0),
glFramebufferTexture3D(0),
glFramebufferTexture(0),
glFramebufferTextureLayer(0),
glFramebufferRenderbuffer(0),
glGenerateMipmap(0),
glBlitFramebuffer(0),
_supported(false),
_packed_depth_stencil_supported(false)
{
LOAD_FBO_EXT(glBindRenderbuffer);
LOAD_FBO_EXT(glGenRenderbuffers);
LOAD_FBO_EXT(glDeleteRenderbuffers);
LOAD_FBO_EXT(glRenderbufferStorage);
LOAD_FBO_EXT(glBindFramebuffer);
LOAD_FBO_EXT(glDeleteFramebuffers);
LOAD_FBO_EXT(glGenFramebuffers);
LOAD_FBO_EXT(glCheckFramebufferStatus);
LOAD_FBO_EXT(glFramebufferTexture1D);
LOAD_FBO_EXT(glFramebufferTexture2D);
LOAD_FBO_EXT(glFramebufferTexture3D);
LOAD_FBO_EXT(glFramebufferTexture);
LOAD_FBO_EXT(glFramebufferTextureLayer);
LOAD_FBO_EXT(glFramebufferRenderbuffer);
LOAD_FBO_EXT(glGenerateMipmap);
LOAD_FBO_EXT(glGetRenderbufferParameteriv);
_supported =
glBindRenderbuffer != 0 &&
glDeleteRenderbuffers != 0 &&
glGenRenderbuffers != 0 &&
glRenderbufferStorage != 0 &&
glBindFramebuffer != 0 &&
glDeleteFramebuffers != 0 &&
glGenFramebuffers != 0 &&
glCheckFramebufferStatus != 0 &&
glFramebufferTexture2D != 0 &&
glFramebufferRenderbuffer != 0 &&
glGenerateMipmap != 0 &&
glGetRenderbufferParameteriv != 0;
#if !defined(OSG_GLES1_AVAILABLE) && !defined(OSG_GLES2_AVAILABLE)
_supported = _supported &&
glFramebufferTexture1D != 0 &&
glFramebufferTexture3D != 0 &&
isGLExtensionOrVersionSupported(contextID,
"GL_EXT_framebuffer_object",3.0f);
#endif
LOAD_FBO_EXT(glBlitFramebuffer);
LOAD_FBO_EXT(glRenderbufferStorageMultisample);
LOAD_FBO_EXT(glRenderbufferStorageMultisampleCoverageNV);
_packed_depth_stencil_supported = OSG_GL3_FEATURES ||
(isGLExtensionSupported(contextID, "GL_EXT_packed_depth_stencil")) ||
(isGLExtensionSupported(contextID, "GL_OES_packed_depth_stencil"));
}
/**************************************************************************
* RenderBuffer
**************************************************************************/
///////////////////////////////////////////////////////////////////////////
// static cache of glRenderbuffers flagged for deletion, which will actually
// be deleted in the correct GL context.
typedef std::list<GLuint> RenderBufferHandleList;
typedef osg::buffered_object<RenderBufferHandleList> DeletedRenderBufferCache;
static OpenThreads::Mutex s_mutex_deletedRenderBufferCache;
static DeletedRenderBufferCache s_deletedRenderBufferCache;
void RenderBuffer::deleteRenderBuffer(unsigned int contextID, GLuint rb)
{
if( rb )
{
OpenThreads::ScopedLock<OpenThreads::Mutex>
lock(s_mutex_deletedRenderBufferCache);
// add glProgram to the cache for the appropriate context.
s_deletedRenderBufferCache[contextID].push_back(rb);
}
}
void RenderBuffer::flushDeletedRenderBuffers(unsigned int contextID,double
/*currentTime*/, double& availableTime)
{
// if no time available don't try to flush objects.
if (availableTime<=0.0) return;
const FBOExtensions* extensions = FBOExtensions::instance(contextID,true);
if(!extensions || !extensions->isSupported() ) return;
const osg::Timer& timer = *osg::Timer::instance();
osg::Timer_t start_tick = timer.tick();
double elapsedTime = 0.0;
{
OpenThreads::ScopedLock<OpenThreads::Mutex>
lock(s_mutex_deletedRenderBufferCache);
RenderBufferHandleList& pList = s_deletedRenderBufferCache[contextID];
for(RenderBufferHandleList::iterator titr=pList.begin();
titr!=pList.end() && elapsedTime<availableTime;
)
{
extensions->glDeleteRenderbuffers(1, &(*titr) );
titr = pList.erase( titr );
elapsedTime = timer.delta_s(start_tick,timer.tick());
}
}
availableTime -= elapsedTime;
}
void RenderBuffer::discardDeletedRenderBuffers(unsigned int contextID)
{
OpenThreads::ScopedLock<OpenThreads::Mutex>
lock(s_mutex_deletedRenderBufferCache);
RenderBufferHandleList& pList = s_deletedRenderBufferCache[contextID];
pList.clear();
}
RenderBuffer::RenderBuffer()
: Object(),
_internalFormat(GL_DEPTH_COMPONENT24),
_width(512),
_height(512),
_samples(0),
_colorSamples(0)
{
}
RenderBuffer::RenderBuffer(int width, int height, GLenum internalFormat, int
samples, int colorSamples)
: Object(),
_internalFormat(internalFormat),
_width(width),
_height(height),
_samples(samples),
_colorSamples(colorSamples)
{
}
RenderBuffer::RenderBuffer(const RenderBuffer ©, const CopyOp ©op)
: Object(copy, copyop),
_internalFormat(copy._internalFormat),
_width(copy._width),
_height(copy._height),
_samples(copy._samples),
_colorSamples(copy._colorSamples)
{
}
RenderBuffer::~RenderBuffer()
{
for(unsigned i=0; i<_objectID.size(); ++i)
{
if (_objectID[i]) deleteRenderBuffer(i, _objectID[i]);
}
}
int RenderBuffer::getMaxSamples(unsigned int contextID, const FBOExtensions
*ext)
{
static osg::buffered_value<GLint> maxSamplesList;
GLint& maxSamples = maxSamplesList[contextID];
if (!maxSamples && ext->isMultisampleSupported())
{
glGetIntegerv(GL_MAX_SAMPLES_EXT, &maxSamples);
}
return maxSamples;
}
GLuint RenderBuffer::getObjectID(unsigned int contextID, const FBOExtensions
*ext) const
{
GLuint &objectID = _objectID[contextID];
int &dirty = _dirty[contextID];
if (objectID == 0)
{
ext->glGenRenderbuffers(1, &objectID);
if (objectID == 0)
return 0;
dirty = 1;
}
if (dirty)
{
// bind and configure
ext->glBindRenderbuffer(GL_RENDERBUFFER_EXT, objectID);
// framebuffer_multisample_coverage specification requires that coverage
// samples must be >= color samples.
if (_samples < _colorSamples)
{
OSG_WARN << "Coverage samples must be greater than or equal to
color samples."
" Setting coverage samples equal to color samples." <<
std::endl;
const_cast<RenderBuffer*>(this)->setSamples(_colorSamples);
}
if (_samples > 0 && ext->isMultisampleCoverageSupported())
{
int samples = minimum(_samples, getMaxSamples(contextID, ext));
int colorSamples = minimum(_colorSamples, samples);
ext->glRenderbufferStorageMultisampleCoverageNV(GL_RENDERBUFFER_EXT,
samples, colorSamples, _internalFormat, _width, _height);
}
else if (_samples > 0 && ext->isMultisampleSupported())
{
int samples = minimum(_samples, getMaxSamples(contextID, ext));
ext->glRenderbufferStorageMultisample(GL_RENDERBUFFER_EXT,
samples, _internalFormat, _width, _height);
}
else
{
ext->glRenderbufferStorage(GL_RENDERBUFFER_EXT, _internalFormat,
_width, _height);
}
dirty = 0;
}
return objectID;
}
void RenderBuffer::resizeGLObjectBuffers(unsigned int maxSize)
{
_objectID.resize(maxSize);
_dirty.resize(maxSize);
}
void RenderBuffer::releaseGLObjects(osg::State* state) const
{
if (state)
{
unsigned int contextID = state->getContextID();
if (_objectID[contextID])
{
deleteRenderBuffer(contextID, _objectID[contextID]);
_objectID[contextID] = 0;
}
}
else
{
for(unsigned i=0; i<_objectID.size(); ++i)
{
if (_objectID[i])
{
deleteRenderBuffer(i, _objectID[i]);
_objectID[i] = 0;
}
}
}
}
/**************************************************************************
* FrameBufferAttachment
**************************************************************************/
#ifndef GL_TEXTURE_CUBE_MAP_POSITIVE_X
#define GL_TEXTURE_CUBE_MAP_POSITIVE_X 0x8515
#endif
struct FrameBufferAttachment::Pimpl
{
enum TargetType
{
RENDERBUFFER,
TEXTURE1D,
TEXTURE2D,
TEXTURE3D,
TEXTURECUBE,
TEXTURERECT,
TEXTURE2DARRAY,
TEXTURE2DMULTISAMPLE
};
TargetType targetType;
ref_ptr<RenderBuffer> renderbufferTarget;
ref_ptr<Texture> textureTarget;
unsigned int cubeMapFace;
unsigned int level;
unsigned int zoffset;
explicit Pimpl(TargetType ttype = RENDERBUFFER, unsigned int lev = 0)
: targetType(ttype),
cubeMapFace(0),
level(lev),
zoffset(0)
{
}
Pimpl(const Pimpl ©)
: targetType(copy.targetType),
renderbufferTarget(copy.renderbufferTarget),
textureTarget(copy.textureTarget),
cubeMapFace(copy.cubeMapFace),
level(copy.level),
zoffset(copy.zoffset)
{
}
};
FrameBufferAttachment::FrameBufferAttachment()
{
_ximpl = new Pimpl;
}
FrameBufferAttachment::FrameBufferAttachment(const FrameBufferAttachment ©)
{
_ximpl = new Pimpl(*copy._ximpl);
}
FrameBufferAttachment::FrameBufferAttachment(RenderBuffer* target)
{
_ximpl = new Pimpl(Pimpl::RENDERBUFFER);
_ximpl->renderbufferTarget = target;
}
FrameBufferAttachment::FrameBufferAttachment(Texture1D* target, unsigned int
level)
{
_ximpl = new Pimpl(Pimpl::TEXTURE1D, level);
_ximpl->textureTarget = target;
}
FrameBufferAttachment::FrameBufferAttachment(Texture2D* target, unsigned int
level)
{
_ximpl = new Pimpl(Pimpl::TEXTURE2D, level);
_ximpl->textureTarget = target;
}
FrameBufferAttachment::FrameBufferAttachment(Texture2DMultisample* target,
unsigned int level)
{
_ximpl = new Pimpl(Pimpl::TEXTURE2DMULTISAMPLE, level);
_ximpl->textureTarget = target;
}
FrameBufferAttachment::FrameBufferAttachment(Texture3D* target, unsigned int
zoffset, unsigned int level)
{
_ximpl = new Pimpl(Pimpl::TEXTURE3D, level);
_ximpl->textureTarget = target;
_ximpl->zoffset = zoffset;
}
FrameBufferAttachment::FrameBufferAttachment(Texture2DArray* target, unsigned
int layer, unsigned int level)
{
_ximpl = new Pimpl(Pimpl::TEXTURE2DARRAY, level);
_ximpl->textureTarget = target;
_ximpl->zoffset = layer;
}
FrameBufferAttachment::FrameBufferAttachment(TextureCubeMap* target, unsigned
int face, unsigned int level)
{
_ximpl = new Pimpl(Pimpl::TEXTURECUBE, level);
_ximpl->textureTarget = target;
_ximpl->cubeMapFace = face;
}
FrameBufferAttachment::FrameBufferAttachment(TextureRectangle* target)
{
_ximpl = new Pimpl(Pimpl::TEXTURERECT);
_ximpl->textureTarget = target;
}
FrameBufferAttachment::FrameBufferAttachment(Camera::Attachment& attachment)
{
osg::Texture* texture = attachment._texture.get();
if (texture)
{
osg::Texture1D* texture1D = dynamic_cast<osg::Texture1D*>(texture);
if (texture1D)
{
_ximpl = new Pimpl(Pimpl::TEXTURE1D, attachment._level);
_ximpl->textureTarget = texture1D;
return;
}
osg::Texture2D* texture2D = dynamic_cast<osg::Texture2D*>(texture);
if (texture2D)
{
_ximpl = new Pimpl(Pimpl::TEXTURE2D, attachment._level);
_ximpl->textureTarget = texture2D;
return;
}
osg::Texture2DMultisample* texture2DMS =
dynamic_cast<osg::Texture2DMultisample*>(texture);
if (texture2DMS)
{
_ximpl = new Pimpl(Pimpl::TEXTURE2DMULTISAMPLE, attachment._level);
_ximpl->textureTarget = texture2DMS;
return;
}
osg::Texture3D* texture3D = dynamic_cast<osg::Texture3D*>(texture);
if (texture3D)
{
_ximpl = new Pimpl(Pimpl::TEXTURE3D, attachment._level);
_ximpl->textureTarget = texture3D;
_ximpl->zoffset = attachment._face;
return;
}
osg::Texture2DArray* texture2DArray =
dynamic_cast<osg::Texture2DArray*>(texture);
if (texture2DArray)
{
_ximpl = new Pimpl(Pimpl::TEXTURE2DARRAY, attachment._level);
_ximpl->textureTarget = texture2DArray;
_ximpl->zoffset = attachment._face;
return;
}
osg::TextureCubeMap* textureCubeMap =
dynamic_cast<osg::TextureCubeMap*>(texture);
if (textureCubeMap)
{
_ximpl = new Pimpl(Pimpl::TEXTURECUBE, attachment._level);
_ximpl->textureTarget = textureCubeMap;
_ximpl->cubeMapFace = attachment._face;
return;
}
osg::TextureRectangle* textureRectangle =
dynamic_cast<osg::TextureRectangle*>(texture);
if (textureRectangle)
{
_ximpl = new Pimpl(Pimpl::TEXTURERECT);
_ximpl->textureTarget = textureRectangle;
return;
}
}
osg::Image* image = attachment._image.get();
if (image)
{
if (image->s()>0 && image->t()>0)
{
GLenum format = attachment._image->getInternalTextureFormat();
if (format == 0)
format = attachment._internalFormat;
_ximpl = new Pimpl(Pimpl::RENDERBUFFER);
_ximpl->renderbufferTarget = new osg::RenderBuffer(image->s(),
image->t(), format);
return;
}
else
{
OSG_WARN<<"Error:
FrameBufferAttachment::FrameBufferAttachment(Camera::Attachment&) passed an
empty osg::Image, image must be allocated first."<<std::endl;
}
}
else
{
OSG_WARN<<"Error:
FrameBufferAttachment::FrameBufferAttachment(Camera::Attachment&) passed an
unrecognised Texture type."<<std::endl;
}
// provide all fallback
_ximpl = new Pimpl();
}
FrameBufferAttachment::~FrameBufferAttachment()
{
delete _ximpl;
}
FrameBufferAttachment &FrameBufferAttachment::operator = (const
FrameBufferAttachment ©)
{
delete _ximpl;
_ximpl = new Pimpl(*copy._ximpl);
return *this;
}
bool FrameBufferAttachment::isMultisample() const
{
if (_ximpl->renderbufferTarget.valid())
{
return _ximpl->renderbufferTarget->getSamples() > 0;
}
return false;
}
void FrameBufferAttachment::createRequiredTexturesAndApplyGenerateMipMap(State
&state, const FBOExtensions* ext) const
{
unsigned int contextID = state.getContextID();
// force compile texture if necessary
Texture::TextureObject *tobj = 0;
if (_ximpl->textureTarget.valid())
{
tobj = _ximpl->textureTarget->getTextureObject(contextID);
if (!tobj || tobj->id() == 0)
{
_ximpl->textureTarget->compileGLObjects(state);
tobj = _ximpl->textureTarget->getTextureObject(contextID);
}
if (!tobj || tobj->id() == 0)
return;
Texture::FilterMode minFilter =
_ximpl->textureTarget->getFilter(Texture::MIN_FILTER);
if (minFilter==Texture::LINEAR_MIPMAP_LINEAR ||
minFilter==Texture::LINEAR_MIPMAP_NEAREST ||
minFilter==Texture::NEAREST_MIPMAP_LINEAR ||
minFilter==Texture::NEAREST_MIPMAP_NEAREST)
{
state.setActiveTextureUnit(0);
state.applyTextureAttribute(0, _ximpl->textureTarget.get());
ext->glGenerateMipmap(_ximpl->textureTarget->getTextureTarget());
}
}
}
void FrameBufferAttachment::attach(State &state, GLenum target, GLenum
attachment_point, const FBOExtensions* ext) const
{
unsigned int contextID = state.getContextID();
Texture::TextureObject *tobj = 0;
if (_ximpl->textureTarget.valid())
{
tobj = _ximpl->textureTarget->getTextureObject(contextID);
if (!tobj || tobj->id() == 0)
{
_ximpl->textureTarget->compileGLObjects(state);
tobj = _ximpl->textureTarget->getTextureObject(contextID);
}
if (!tobj || tobj->id() == 0)
return;
}
switch (_ximpl->targetType)
{
default:
case Pimpl::RENDERBUFFER:
ext->glFramebufferRenderbuffer(target, attachment_point,
GL_RENDERBUFFER_EXT, _ximpl->renderbufferTarget->getObjectID(contextID, ext));
break;
case Pimpl::TEXTURE1D:
ext->glFramebufferTexture1D(target, attachment_point, GL_TEXTURE_1D,
tobj->id(), _ximpl->level);
break;
case Pimpl::TEXTURE2D:
ext->glFramebufferTexture2D(target, attachment_point, GL_TEXTURE_2D,
tobj->id(), _ximpl->level);
break;
case Pimpl::TEXTURE2DMULTISAMPLE:
ext->glFramebufferTexture2D(target, attachment_point,
GL_TEXTURE_2D_MULTISAMPLE, tobj->id(), _ximpl->level);
break;
case Pimpl::TEXTURE3D:
if (_ximpl->zoffset == Camera::FACE_CONTROLLED_BY_GEOMETRY_SHADER)
{
if (ext->glFramebufferTexture)
{
ext->glFramebufferTexture(target, attachment_point, tobj->id(),
_ximpl->level);
}
}
else
ext->glFramebufferTexture3D(target, attachment_point,
GL_TEXTURE_3D, tobj->id(), _ximpl->level, _ximpl->zoffset);
break;
case Pimpl::TEXTURE2DARRAY:
if (_ximpl->zoffset == Camera::FACE_CONTROLLED_BY_GEOMETRY_SHADER)
{
if (ext->glFramebufferTexture)
{
ext->glFramebufferTexture(target, attachment_point, tobj->id(),
_ximpl->level);
}
}
else
ext->glFramebufferTextureLayer(target, attachment_point,
tobj->id(), _ximpl->level, _ximpl->zoffset);
break;
case Pimpl::TEXTURERECT:
ext->glFramebufferTexture2D(target, attachment_point,
GL_TEXTURE_RECTANGLE, tobj->id(), 0);
break;
case Pimpl::TEXTURECUBE:
if (_ximpl->cubeMapFace == Camera::FACE_CONTROLLED_BY_GEOMETRY_SHADER)
{
if (ext->glFramebufferTexture)
{
ext->glFramebufferTexture(target, attachment_point, tobj->id(),
_ximpl->level);
}
}
else
ext->glFramebufferTexture2D(target, attachment_point,
GL_TEXTURE_CUBE_MAP_POSITIVE_X + _ximpl->cubeMapFace, tobj->id(),
_ximpl->level);
break;
}
}
int FrameBufferAttachment::compare(const FrameBufferAttachment &fa) const
{
if (&fa == this) return 0;
if (_ximpl->targetType < fa._ximpl->targetType) return -1;
if (_ximpl->targetType > fa._ximpl->targetType) return 1;
if (_ximpl->renderbufferTarget.get() < fa._ximpl->renderbufferTarget.get())
return -1;
if (_ximpl->renderbufferTarget.get() > fa._ximpl->renderbufferTarget.get())
return 1;
if (_ximpl->textureTarget.get() < fa._ximpl->textureTarget.get()) return -1;
if (_ximpl->textureTarget.get() > fa._ximpl->textureTarget.get()) return 1;
if (_ximpl->cubeMapFace < fa._ximpl->cubeMapFace) return -1;
if (_ximpl->cubeMapFace > fa._ximpl->cubeMapFace) return 1;
if (_ximpl->level < fa._ximpl->level) return -1;
if (_ximpl->level > fa._ximpl->level) return 1;
if (_ximpl->zoffset < fa._ximpl->zoffset) return -1;
if (_ximpl->zoffset > fa._ximpl->zoffset) return 1;
return 0;
}
RenderBuffer* FrameBufferAttachment::getRenderBuffer()
{
return _ximpl->renderbufferTarget.get();
}
Texture* FrameBufferAttachment::getTexture()
{
return _ximpl->textureTarget.get();
}
const RenderBuffer* FrameBufferAttachment::getRenderBuffer() const
{
return _ximpl->renderbufferTarget.get();
}
const Texture* FrameBufferAttachment::getTexture() const
{
return _ximpl->textureTarget.get();
}
unsigned int FrameBufferAttachment::getCubeMapFace() const
{
return _ximpl->cubeMapFace;
}
unsigned int FrameBufferAttachment::getTextureLevel() const
{
return _ximpl->level;
}
unsigned int FrameBufferAttachment::getTexture3DZOffset() const
{
return _ximpl->zoffset;
}
unsigned int FrameBufferAttachment::getTextureArrayLayer() const
{
return _ximpl->zoffset;
}
/**************************************************************************
* FrameBufferObject
**************************************************************************/
///////////////////////////////////////////////////////////////////////////
// static cache of glRenderbuffers flagged for deletion, which will actually
// be deleted in the correct GL context.
typedef std::list<GLuint> FrameBufferObjectHandleList;
typedef osg::buffered_object<FrameBufferObjectHandleList>
DeletedFrameBufferObjectCache;
static OpenThreads::Mutex s_mutex_deletedFrameBufferObjectCache;
static DeletedFrameBufferObjectCache s_deletedFrameBufferObjectCache;
void FrameBufferObject::deleteFrameBufferObject(unsigned int contextID, GLuint
rb)
{
if( rb )
{
OpenThreads::ScopedLock<OpenThreads::Mutex>
lock(s_mutex_deletedFrameBufferObjectCache);
// add glProgram to the cache for the appropriate context.
s_deletedFrameBufferObjectCache[contextID].push_back(rb);
}
}
void FrameBufferObject::flushDeletedFrameBufferObjects(unsigned int
contextID,double /*currentTime*/, double& availableTime)
{
// if no time available don't try to flush objects.
if (availableTime<=0.0) return;
const FBOExtensions* extensions = FBOExtensions::instance(contextID,true);
if(!extensions || !extensions->isSupported() ) return;
const osg::Timer& timer = *osg::Timer::instance();
osg::Timer_t start_tick = timer.tick();
double elapsedTime = 0.0;
{
OpenThreads::ScopedLock<OpenThreads::Mutex>
lock(s_mutex_deletedFrameBufferObjectCache);
FrameBufferObjectHandleList& pList =
s_deletedFrameBufferObjectCache[contextID];
for(FrameBufferObjectHandleList::iterator titr=pList.begin();
titr!=pList.end() && elapsedTime<availableTime;
)
{
extensions->glDeleteFramebuffers(1, &(*titr) );
titr = pList.erase( titr );
elapsedTime = timer.delta_s(start_tick,timer.tick());
}
}
availableTime -= elapsedTime;
}
void FrameBufferObject::discardDeletedFrameBufferObjects(unsigned int contextID)
{
OpenThreads::ScopedLock<OpenThreads::Mutex>
lock(s_mutex_deletedFrameBufferObjectCache);
FrameBufferObjectHandleList& pList =
s_deletedFrameBufferObjectCache[contextID];
pList.clear();
}
FrameBufferObject::FrameBufferObject()
: StateAttribute()
{
}
FrameBufferObject::FrameBufferObject(const FrameBufferObject ©, const
CopyOp ©op)
: StateAttribute(copy, copyop),
_attachments(copy._attachments),
_drawBuffers(copy._drawBuffers)
{
}
FrameBufferObject::~FrameBufferObject()
{
for(unsigned i=0; i<_fboID.size(); ++i)
{
if (_fboID[i]) deleteFrameBufferObject(i, _fboID[i]);
}
}
void FrameBufferObject::resizeGLObjectBuffers(unsigned int maxSize)
{
_fboID.resize(maxSize);
_unsupported.resize(maxSize);
_fboID.resize(maxSize);
}
void FrameBufferObject::releaseGLObjects(osg::State* state) const
{
if (state)
{
unsigned int contextID = state->getContextID();
if (_fboID[contextID])
{
deleteFrameBufferObject(contextID, _fboID[contextID]);
_fboID[contextID] = 0;
}
}
else
{
for(unsigned int i=0; i<_fboID.size(); ++i)
{
if (_fboID[i])
{
deleteFrameBufferObject(i, _fboID[i]);
_fboID[i] = 0;
}
}
}
}
void FrameBufferObject::setAttachment(BufferComponent attachment_point, const
FrameBufferAttachment &attachment)
{
_attachments[attachment_point] = attachment;
updateDrawBuffers();
dirtyAll();
}
GLenum FrameBufferObject::convertBufferComponentToGLenum(BufferComponent
attachment_point) const
{
switch(attachment_point)
{
case(Camera::DEPTH_BUFFER): return GL_DEPTH_ATTACHMENT_EXT;
case(Camera::STENCIL_BUFFER): return GL_STENCIL_ATTACHMENT_EXT;
case(Camera::COLOR_BUFFER): return GL_COLOR_ATTACHMENT0_EXT;
default: return GLenum(GL_COLOR_ATTACHMENT0_EXT +
(attachment_point-Camera::COLOR_BUFFER0));
}
}
void FrameBufferObject::updateDrawBuffers()
{
_drawBuffers.clear();
// create textures and mipmaps before we bind the frame buffer object
for (AttachmentMap::const_iterator i=_attachments.begin();
i!=_attachments.end(); ++i)
{
// setup draw buffers based on the attachment definition
if (i->first >= Camera::COLOR_BUFFER0 && i->first <=
Camera::COLOR_BUFFER15)
_drawBuffers.push_back(convertBufferComponentToGLenum(i->first));
}
}
void FrameBufferObject::apply(State &state) const
{
apply(state, READ_DRAW_FRAMEBUFFER);
}
void FrameBufferObject::apply(State &state, BindTarget target) const
{
unsigned int contextID = state.getContextID();
if (_unsupported[contextID])
return;
FBOExtensions* ext = FBOExtensions::instance(contextID,true);
if (!ext->isSupported())
{
_unsupported[contextID] = 1;
OSG_WARN << "Warning: EXT_framebuffer_object is not supported" <<
std::endl;
return;
}
if (_attachments.empty())
{
ext->glBindFramebuffer(target, 0);
return;
}
int &dirtyAttachmentList = _dirtyAttachmentList[contextID];
GLuint &fboID = _fboID[contextID];
if (fboID == 0)
{
ext->glGenFramebuffers(1, &fboID);
if (fboID == 0)
{
OSG_WARN << "Warning: FrameBufferObject: could not create the FBO"
<< std::endl;
return;
}
dirtyAttachmentList = 1;
}
if (dirtyAttachmentList)
{
// the set of of attachments appears to be thread sensitive, it
shouldn't be because
// OpenGL FBO handles osg::FrameBufferObject has are multi-buffered...
// so as a temporary fix will stick in a mutex to ensure that only one
thread passes through here
// at one time.
static OpenThreads::Mutex s_mutex;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_mutex);
// create textures and mipmaps before we bind the frame buffer object
for (AttachmentMap::const_iterator i=_attachments.begin();
i!=_attachments.end(); ++i)
{
const FrameBufferAttachment &fa = i->second;
fa.createRequiredTexturesAndApplyGenerateMipMap(state, ext);
}
}
ext->glBindFramebuffer(target, fboID);
// enable drawing buffers to render the result to fbo
if ( (target == READ_DRAW_FRAMEBUFFER) || (target == DRAW_FRAMEBUFFER) )
{
if (_drawBuffers.size() > 0)
{
GL2Extensions *gl2e = GL2Extensions::Get(state.getContextID(), true
);
if (gl2e && gl2e->isDrawBuffersSupported())
{
gl2e->glDrawBuffers(_drawBuffers.size(), &(_drawBuffers[0]));
}
else
{
OSG_WARN <<"Warning: FrameBufferObject: could not set draw
buffers, glDrawBuffers is not supported!" << std::endl;
}
}
}
if (dirtyAttachmentList)
{
for (AttachmentMap::const_iterator i=_attachments.begin();
i!=_attachments.end(); ++i)
{
const FrameBufferAttachment &fa = i->second;
switch(i->first)
{
case(Camera::PACKED_DEPTH_STENCIL_BUFFER):
if (ext->isPackedDepthStencilSupported())
{
fa.attach(state, target, GL_DEPTH_ATTACHMENT_EXT, ext);
fa.attach(state, target, GL_STENCIL_ATTACHMENT_EXT,
ext);
}
else
{
OSG_WARN <<
"Warning: FrameBufferObject: could not attach
PACKED_DEPTH_STENCIL_BUFFER, "
"EXT_packed_depth_stencil is not supported!" <<
std::endl;
}
break;
default:
fa.attach(state, target,
convertBufferComponentToGLenum(i->first), ext);
break;
}
}
dirtyAttachmentList = 0;
}
GLenum status = ext->glCheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
{
OSG_NOTICE<<"FrameBufferObject::apply(), FBO setup failed, FBO status=
0x"<<std::hex<<status<<std::dec<<std::endl;
}
}
bool FrameBufferObject::isMultisample() const
{
if (_attachments.size())
{
// If the FBO is correctly set up then all attachments will be either
// multisampled or single sampled. Therefore we can just return the
// result of the first attachment.
return _attachments.begin()->second.isMultisample();
}
return false;
}
int FrameBufferObject::compare(const StateAttribute &sa) const
{
COMPARE_StateAttribute_Types(FrameBufferObject, sa);
COMPARE_StateAttribute_Parameter(_attachments.size());
AttachmentMap::const_iterator i = _attachments.begin();
AttachmentMap::const_iterator j = rhs._attachments.begin();
for (; i!=_attachments.end(); ++i, ++j)
{
int cmp = i->second.compare(j->second);
if (cmp != 0) return cmp;
}
return 0;
}
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