Thanks for your help, I'll check into the Camera callback. I've dissected the
the osgfpdepth example already ... that's where I learned to do the floating
point depth buffer and the anti-aliasing setup for a frame buffer object. I'll
look into it again to see if I've missed something ...
I'm fairly certain that I'm approaching it the correct way as RenderStage calls
glBlitFramebuffer(...) to blit from a buffer to a texture according to a buffer
attachment map owned by its resolve FBO :
Code:
GLbitfield blitMask = 0;
//find which buffer types should be copied
for (FrameBufferObject::AttachmentMap::const_iterator
it = _resolveFbo->getAttachmentMap().begin(),
end =_resolveFbo->getAttachmentMap().end(); it != end; ++it)
{
switch (it->first)
{
case Camera::DEPTH_BUFFER:
blitMask |= GL_DEPTH_BUFFER_BIT;
break;
case Camera::STENCIL_BUFFER:
blitMask |= GL_STENCIL_BUFFER_BIT;
break;
case Camera::PACKED_DEPTH_STENCIL_BUFFER:
blitMask |= GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT;
break;
case Camera::COLOR_BUFFER:
blitMask |= GL_COLOR_BUFFER_BIT;
break;
default: ...
}
}
// Bind the resolve framebuffer to blit into.
_fbo->apply(state, FrameBufferObject::READ_FRAMEBUFFER);
_resolveFbo->apply(state, FrameBufferObject::DRAW_FRAMEBUFFER);
if (blitMask)
{
// Blit to the resolve framebuffer.
fbo_ext->glBlitFramebuffer(
0, 0, static_cast<GLint>(_viewport->width()),
static_cast<GLint>(_viewport->height()),
0, 0, static_cast<GLint>(_viewport->width()),
static_cast<GLint>(_viewport->height()),
blitMask, GL_NEAREST);
}
[/code]
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=48145#48145
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