FGFS-4.1/OpenSceneGraph
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Futher work on FBO support

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This commit is contained in:
Robert Osfield
2005-06-15 20:06:10 +00:00
parent bc76fbf60d
commit 77a4cef9d6
3 changed files with 102 additions and 28 deletions
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84
examples/osgfbo/osgfbo.cpp
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@@ -27,7 +27,7 @@ public:
ClearBuffer() {}
ClearBuffer(const ClearBuffer &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY): osg::Drawable(copy, copyop) {}
META_Object(example, ClearBuffer);
void drawImplementation(osg::State &state) const
void drawImplementation(osg::State&) const
{
glPushAttrib(GL_COLOR_BUFFER_BIT);
glClearColor(0.5f, 0.1f, 0.1f, 1.0f);
@@ -64,25 +64,6 @@ osg::Node *build_quad(osg::Texture2D *tex)
return geode;
}
// This class is provided because osg::Texture classes
// don't apply texture parameters when the image pointer
// is null. When performing render-to-texture, texture
// data must be applied as usual but a null pointer must
// be specified as pixel data.
// This is another trick: it would be better to allow
// null image pointers in osg::Texture classes.
struct MySubload: public osg::Texture2D::SubloadCallback
{
void load(const osg::Texture2D &texture, osg::State &state) const
{
glTexImage2D(GL_TEXTURE_2D, 0, texture.getInternalFormat(), texture.getTextureWidth(), texture.getTextureHeight(), texture.getBorderWidth(), GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
void subload(const osg::Texture2D &texture, osg::State &state) const
{
}
};
void build_world(osg::Group *root)
{
int width = 512;
@@ -97,7 +78,6 @@ void build_world(osg::Group *root)
tex->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
tex->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
tex->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
tex->setSubloadCallback(new MySubload);
// create and configure a framebuffer object.
// We attach the texture to the first color buffer,
@@ -107,6 +87,67 @@ void build_world(osg::Group *root)
fbo->setAttachment(GL_COLOR_ATTACHMENT0_EXT, osg::FramebufferAttachment(tex.get()));
fbo->setAttachment(GL_DEPTH_ATTACHMENT_EXT, osg::FramebufferAttachment(new osg::Renderbuffer(width, height, GL_DEPTH_COMPONENT24)));
#if 0
osg::ref_ptr<osg::Node> subgraph = osgDB::readNodeFile("cow.osg");
if (!subgraph) return;
const osg::BoundingSphere& bs = subgraph->getBound();
if (!bs.valid())
{
return;
}
osg::ref_ptr<osg::CameraNode> camera = new osg::CameraNode;
camera->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setViewport(0, 0, width, height);
camera->getOrCreateStateSet()->setAttribute(camera->getViewport());
// set the camera to render before the main camera.
camera->setRenderOrder(osg::CameraNode::PRE_RENDER);
float znear = 1.0f*bs.radius();
float zfar = 3.0f*bs.radius();
// 2:1 aspect ratio as per flag geomtry below.
float proj_top = 0.5f*znear;
float proj_right = 0.5f*znear;
znear *= 0.9f;
zfar *= 1.1f;
// set up projection.
camera->setProjectionMatrixAsFrustum(-proj_right,proj_right,-proj_top,proj_top,znear,zfar);
// set view
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setViewMatrixAsLookAt(bs.center()+osg::Vec3(0.0f,2.0f,0.0f)*bs.radius(),bs.center(),osg::Vec3(0.0f,0.0f,1.0f));
#if 1
// add a ClearBuffer drawable to the offscreen subgraph
// in order to clear the color and depth buffers
osg::ref_ptr<osg::Geode> cbuf = new osg::Geode;
cbuf->addDrawable(new ClearBuffer);
cbuf->getOrCreateStateSet()->setRenderBinDetails(-2, "RenderBin");
camera->addChild(cbuf.get());
// attach the FBO.
camera->getOrCreateStateSet()->setAttribute(fbo.get());
#else
// use glCopyTexSubImage
camera->attach(osg::CameraNode::COLOR_BUFFER,tex.get());
#endif
// attach the subgraph
camera->addChild(subgraph.get());
root->addChild(camera.get());
#else
// create a subgraph that will be rendered to texture.
// We apply the previously created FBO and a Viewport
// attribute to this subgraph.
@@ -127,6 +168,7 @@ void build_world(osg::Group *root)
// add our beloved cow the offscreen subgraph
offscreen->addChild(osgDB::readNodeFile("cow.osg"));
#endif
// now create a simple quad that will be rendered
// in the main framebuffers. The quad's texture