// Assemble lists of the valid buffer configurations, along with the
// possibilities for multisample coverage antialiasing, if any.
void getPossibleConfigs(GraphicsContext* gc, BufferConfigList& colorConfigs,
BufferConfigList& depthConfigs,
vector<int>& coverageConfigs)
{
int maxSamples = 0;
int coverageSampleConfigs = 0;
unsigned contextID = gc->getState()->getContextID();
colorConfigs.push_back(BufferConfig("RGBA8", GL_RGBA8, 8));
depthConfigs.push_back(BufferConfig("D24", GL_DEPTH_COMPONENT24, 24));
FBOExtensions* fboe = FBOExtensions::instance(contextID, true);
if (!fboe->isSupported())
return;
if (fboe->isMultisampleSupported())
glGetIntegerv(GL_MAX_SAMPLES_EXT, &maxSamples);
// isMultisampleCoverageSupported
if (isGLExtensionSupported(contextID,
"GL_NV_framebuffer_multisample_coverage"))
{
glGetIntegerv(GL_MAX_MULTISAMPLE_COVERAGE_MODES_NV,
&coverageSampleConfigs);
coverageConfigs.resize(coverageSampleConfigs * 2 + 4);
glGetIntegerv(GL_MULTISAMPLE_COVERAGE_MODES_NV, &coverageConfigs[0]);
}
if (isGLExtensionSupported(contextID, "GL_ARB_depth_buffer_float"))
depthConfigs.push_back(BufferConfig("D32F", GL_DEPTH_COMPONENT32F, 32));
else if (isGLExtensionSupported(contextID, "GL_NV_depth_buffer_float"))
depthConfigs.push_back(BufferConfig("D32F", GL_DEPTH_COMPONENT32F_NV,
32));
}
bool checkFramebufferStatus(GraphicsContext* gc, bool silent = false)
{
State& state = *gc->getState();
unsigned contextID = state.getContextID();
FBOExtensions* fboe = FBOExtensions::instance(contextID, true);
switch(fboe->glCheckFramebufferStatus(GL_FRAMEBUFFER_EXT)) {
case GL_FRAMEBUFFER_COMPLETE_EXT:
break;
case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
if (!silent)
cout << "Unsupported framebuffer format\n";
return false;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
if (!silent)
cout << "Framebuffer incomplete, missing attachment\n";
return false;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
if (!silent)
cout << "Framebuffer incomplete, duplicate attachment\n";
return false;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
if (!silent)
cout << "Framebuffer incomplete, attached images must have same dimensions\n";
return false;
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
if (!silent)
cout << "Framebuffer incomplete, attached images must have same format\n";
return false;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
if (!silent)
cout << "Framebuffer incomplete, missing draw buffer\n";
return false;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
if (!silent)
cout << "Framebuffer incomplete, missing read buffer\n";
return false;
default:
return false;
}
return true;
}
// Standard OSG code for initializing osgViewer::Viewer with explicit
// creation of own graphics context. This is also a good time to test
// for valid frame buffer configurations; we have a valid graphics
// context, but multithreading hasn't started, etc.
GraphicsContext* setupGC(osgViewer::Viewer& viewer, ArgumentParser& arguments)
{
int x = -1, y = -1, width = -1, height = -1;
while (arguments.read("--window",x,y,width,height)) {}
GraphicsContext::WindowingSystemInterface* wsi =
GraphicsContext::getWindowingSystemInterface();
if (!wsi)
{
OSG_NOTIFY(NOTICE)<<"View::setUpViewOnSingleScreen() : Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
return 0;
}
DisplaySettings* ds = viewer.getDisplaySettings() ? viewer.getDisplaySettings() : DisplaySettings::instance().get();
GraphicsContext::ScreenIdentifier si;
si.readDISPLAY();
// displayNum has not been set so reset it to 0.
if (si.displayNum<0) si.displayNum = 0;
bool decoration = true;
if (x < 0)
{
unsigned int w, h;
wsi->getScreenResolution(si, w, h);
x = 0;
y = 0;
width = w;
height = h;
decoration = false;
}
ref_ptr<GraphicsContext::Traits> traits
= new GraphicsContext::Traits(ds);
traits->hostName = si.hostName;
traits->displayNum = si.displayNum;
traits->screenNum = si.screenNum;
traits->x = x;
traits->y = y;
traits->width = width;
traits->height = height;
traits->windowDecoration = decoration;
traits->doubleBuffer = true;
traits->sharedContext = 0;
ref_ptr<GraphicsContext> gc
= GraphicsContext::createGraphicsContext(traits.get());
osgViewer::GraphicsWindow* gw
= dynamic_cast<osgViewer::GraphicsWindow*>(gc.get());
if (gw)
{
OSG_NOTIFY(INFO)<<"View::setUpViewOnSingleScreen - GraphicsWindow has been created successfully."<<std::endl;
gw->getEventQueue()->getCurrentEventState()
->setWindowRectangle(0, 0, width, height);
}
else
{
OSG_NOTIFY(NOTICE)<<" GraphicsWindow has not been created successfully."<<std::endl;
}
double fovy, aspectRatio, zNear, zFar;
viewer.getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio,
zNear, zFar);
double newAspectRatio = double(traits->width) / double(traits->height);
double aspectRatioChange = newAspectRatio / aspectRatio;
if (aspectRatioChange != 1.0)
{
viewer.getCamera()->getProjectionMatrix()
*= Matrix::scale(1.0/aspectRatioChange,1.0,1.0);
}
// Context has to be current to test for extensions
gc->realize();
gc->makeCurrent();
unsigned int contextID = gc->getState()->getContextID();
FBOExtensions* fboe = FBOExtensions::instance(contextID, true);
if (!fboe->isSupported())
{
OSG_NOTIFY(NOTICE) << "Frame buffer objects are not supported\n";
gc->releaseContext();
gc->close(true);
return 0;
}
if (isGLExtensionSupported(contextID, "GL_ARB_depth_buffer_float"))
depthTextureEnum = GL_DEPTH_COMPONENT32F;
else if (isGLExtensionSupported(contextID, "GL_NV_depth_buffer_float"))
depthTextureEnum = GL_DEPTH_COMPONENT32F_NV;
BufferConfigList colorConfigs;
BufferConfigList depthConfigs;
vector<int> coverageConfigs;
getPossibleConfigs(gc.get(), colorConfigs, depthConfigs, coverageConfigs);
int coverageSampleConfigs = (coverageConfigs.size() - 4) / 2;
cout << "color configs\nname\tbits\n";
for (BufferConfigList::const_iterator colorItr = colorConfigs.begin(),
colorEnd = colorConfigs.end();
colorItr != colorEnd;
++colorItr)
{
for (BufferConfigList::const_iterator depthItr = depthConfigs.begin(),
depthEnd = depthConfigs.end();
depthItr != depthEnd;
++depthItr)
{
string root = colorItr->name + " " + depthItr->name;
FboConfig config(root, colorItr->format, depthItr->format,
colorItr->bits, depthItr->bits);
FboData data;
if (createFBO(gc.get(), config, data))
validConfigs.push_back(config);
destroyFBO(gc.get(), data);
if (coverageConfigs.size() > 0)
{
//CSAA provides a list of all supported AA modes for
//quick enumeration
for (int kk = 0; kk < coverageSampleConfigs; kk++)
{
stringstream msText;
msText << root;
config.depthSamples = coverageConfigs[kk*2+1];
config.coverageSamples = coverageConfigs[kk*2];
if ( config.coverageSamples == config.depthSamples )
{
// Normal antialiasing
msText << " - " << config.depthSamples << " MSAA";
}
else
{
// coverage antialiasing
msText << " - " << config.coverageSamples << "/"
<< config.depthSamples << " CSAA";
}
config.name = msText.str();
if (createFBO(gc.get(), config, data)) {
validConfigs.push_back( config);
}
destroyFBO(gc.get(), data);
}
}
}
}
if (validConfigs.empty())
{
cout << "no valid frame buffer configurations!\n";
return 0;
}
cout << "valid frame buffer configurations:\n";
for (vector<FboConfig>::iterator itr = validConfigs.begin(),
end = validConfigs.end();
itr != end;
++itr)
cout << itr->name << "\n";
gc->releaseContext();
return gc.release();
}
// Attempt to create an FBO with a certain configuration. If the FBO
// is created with fewer bits in any of its parameters, the creation
// is deemed to have failed. Even though the result is a valid FBO,
// we're only interested in discrete, valid configurations.
bool createFBO(GraphicsContext* gc, FboConfig &config, FboData &data)
{
bool result = true;
bool multisample = config.depthSamples > 0;
bool csaa = config.coverageSamples > config.depthSamples;
data.fb = new FrameBufferObject;
int texWidth = 512, texHeight = 512;
data.tex = new Texture2D;
data.tex->setTextureSize(texWidth, texHeight);
data.tex->setInternalFormat(config.colorFormat);
data.tex->setSourceFormat(GL_RGBA);
data.tex->setSourceType(GL_FLOAT);
data.tex->setFilter(Texture::MIN_FILTER, Texture::LINEAR_MIPMAP_LINEAR);
data.tex->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
data.tex->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
data.tex->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
RenderBuffer* colorRB = 0;
RenderBuffer* depthRB = 0;
if (multisample)
{
data.resolveFB = new FrameBufferObject;
data.resolveFB->setAttachment(Camera::COLOR_BUFFER,
FrameBufferAttachment(data.tex.get()));
colorRB = new RenderBuffer(texWidth, texHeight, config.colorFormat,
config.coverageSamples, config.depthSamples);
data.fb->setAttachment(Camera::COLOR_BUFFER,
FrameBufferAttachment(colorRB));
depthRB = new RenderBuffer(texWidth, texHeight, config.depthFormat,
config.coverageSamples, config.depthSamples);
data.fb->setAttachment(Camera::DEPTH_BUFFER,
FrameBufferAttachment(depthRB));
}
else
{
data.depthTex = makeDepthTexture(texWidth, texHeight,
config.depthFormat);
data.fb->setAttachment(Camera::COLOR_BUFFER,
FrameBufferAttachment(data.tex.get()));
data.fb->setAttachment(Camera::DEPTH_BUFFER,
FrameBufferAttachment(data.depthTex.get()));
}
State& state = *gc->getState();
unsigned int contextID = state.getContextID();
FBOExtensions* fboe = FBOExtensions::instance(contextID, true);
data.fb->apply(state);
result = checkFramebufferStatus(gc, true);
if (!result)
{
fboe->glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
return false;
}
int query;
if (multisample)
{
GLuint colorRBID = colorRB->getObjectID(contextID, fboe);
fboe->glBindRenderbuffer(GL_RENDERBUFFER_EXT, colorRBID);
if (csaa)
{
fboe->glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT,
GL_RENDERBUFFER_COVERAGE_SAMPLES_NV,
&query);
if (query < config.coverageSamples)
result = false;
else
config.coverageSamples = query;
fboe->glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT,
GL_RENDERBUFFER_COLOR_SAMPLES_NV,
&query);
if ( query < config.depthSamples)
result = false;
else
config.depthSamples = query; // report back the actual number
}
else
{
fboe->glGetRenderbufferParameteriv(GL_RENDERBUFFER_EXT,
GL_RENDERBUFFER_SAMPLES_EXT,
&query);
if (query < config.depthSamples)
result = false;
else
config.depthSamples = query;
}
}
glGetIntegerv( GL_RED_BITS, &query);
if (query != config.redbits)
result = false;
glGetIntegerv(GL_DEPTH_BITS, &query);
if ( query != config.depthBits)
result = false;
if (result && multisample && data.resolveFB.valid())
{
data.resolveFB->apply(state);
result = checkFramebufferStatus(gc, true);
if (result)
{
glGetIntegerv( GL_RED_BITS, &query);
if (query != config.redbits)
result = false;
}
}
fboe->glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
return result;
}
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;
notify(WARN) << "Warning: EXT_framebuffer_object is not supported" << std::endl;
return;
}
if (_attachments.empty())
{
ext->glBindFramebufferEXT(target, 0);
return;
}
int &dirtyAttachmentList = _dirtyAttachmentList[contextID];
GLuint &fboID = _fboID[contextID];
if (fboID == 0)
{
ext->glGenFramebuffersEXT(1, &fboID);
if (fboID == 0)
{
notify(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->glBindFramebufferEXT(target, fboID);
// enable drawing buffers to render the result to fbo
if (_drawBuffers.size() > 0)
{
GL2Extensions *gl2e = GL2Extensions::Get(state.getContextID(), true );
if (gl2e)
{
gl2e->glDrawBuffers(_drawBuffers.size(), &(_drawBuffers[0]));
}
}
if (dirtyAttachmentList)
{
for (AttachmentMap::const_iterator i=_attachments.begin(); i!=_attachments.end(); ++i)
{
const FrameBufferAttachment &fa = i->second;
fa.attach(state, target, convertBufferComponentToGLenum(i->first), ext);
}
dirtyAttachmentList = 0;
}
}
