[osg-submissions] Bug in MRT and FBO

[Art Tevs]

Hi folks,

current implementation of MRT is not correct. The issue comes whenever one tries to attach more than one render target to a FBO using the setAttachment(GLenum,...) method. For example something like this:
fbo->setAttachment(GL_COLOR_ATTACHMENT0_EXT, ..)
fbo->setAttachment(GL_COLOR_ATTACHMENT1_EXT, ..)
fbo->setAttachment(GL_COLOR_ATTACHMENT2_EXT, ..)
fbo->setAttachment(GL_COLOR_ATTACHMENT3_EXT, ..)

The conversion of glenum to Camera::BufferComponent is correct however in the FrameBufferObject::updateDrawBuffers the attachments are only added if attachment point is >= Camera::COLOR_BUFFER0 && <= Camera::COLOR_BUFFER15
However Camera::COLOR_BUFFER and Camera::COLOR_BUFFER0 are not equal, hence the first attachment is never attached.

The patch do just change the definition in Camera class adding COLOR_BUFFER=COLOR_BUFFER0. This is actually also the intuitive meaning of that values ;)


NOTE: 
- "Camera.cpp" goes into src/osgPlugins/osg/
- "Camera" goes to include/osg/

Best regards,
Art



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