FGFS-4.1/OpenSceneGraph
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Added GL2Extensions::isDrawBuffersSupported() and usage of this in FrameBufferObject.cpp to prevent crash under GLES2 when users attempt to use MRT when it's not supported

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This commit is contained in:
Robert Osfield 2013-07-24 13:02:32 +00:00
parent 9b733baf02
commit 75fd039dba
2 changed files with 8 additions and 2 deletions
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2
include/osg/GL2Extensions
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@ -530,6 +530,8 @@ class OSG_EXPORT GL2Extensions : public osg::Referenced
void setShaderAtomicCounterSupported(bool flag) { _isShaderAtomicCountersSupported = flag; }
bool isShaderAtomicCounterSupported() const {return _isShaderAtomicCountersSupported; }
bool isDrawBuffersSupported() const { return _glDrawBuffers!=0; }
/** Function to call to get the extension of a specified context.
* If the Exentsion object for that context has not yet been created then
* and the 'createIfNotInitalized' flag been set to false then returns NULL.

8
src/osg/FrameBufferObject.cpp
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@ -916,10 +916,14 @@ void FrameBufferObject::apply(State &state, BindTarget target) const
if (_drawBuffers.size() > 0)
{
GL2Extensions *gl2e = GL2Extensions::Get(state.getContextID(), true );
if (gl2e)
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)
@ -939,7 +943,7 @@ void FrameBufferObject::apply(State &state, BindTarget target) const
{
OSG_WARN <<
"Warning: FrameBufferObject: could not attach PACKED_DEPTH_STENCIL_BUFFER, "
"EXT_packed_depth_stencil is not supported !" << std::endl;
"EXT_packed_depth_stencil is not supported!" << std::endl;
}
break;