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

43
include/osg/CameraNode
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@@ -191,6 +191,29 @@ class OSG_EXPORT CameraNode : public Transform, public CullSettings
void setRenderTargetImplmentation(RenderTargetImplementation impl) { _renderTargetImplementation = impl; }
RenderTargetImplementation getRenderTargetImplmentation() const { return _renderTargetImplementation; }
/** Set the draw buffer for a given fragment output position to specified draw buffer. */
void setDrawBuffer(unsigned int pos, GLenum buffer);
/** Get the draw buffer for a given fragment output position. */
GLenum getDrawBuffer(unsigned int pos);
typedef std::vector<GLenum> DrawBufferList;
/** Get the list which draw buffer are active. */
DrawBufferList& getDrawBufferList() { return _drawBufferList; }
/** Get the const list which draw buffer are active. */
const DrawBufferList& getDrawBufferList() const { return _drawBufferList; }
/** Set the read buffer for any required copy operations to use. */
void setReadBuffer(GLenum buffer) { _readBuffer = buffer; }
/** Get the read buffer for any required copy operations to use. */
GLenum getReadBuffer() const { return _readBuffer; }
enum BufferComponent
{
COLOR_BUFFER,
@@ -200,7 +223,7 @@ class OSG_EXPORT CameraNode : public Transform, public CullSettings
void attach(BufferComponent buffer, GLenum internalFormat);
void attach(BufferComponent buffer, osg::Texture* texture, unsigned int face=0);
void attach(BufferComponent buffer, osg::Texture* texture, unsigned int level = 0, unsigned int face=0);
void attach(BufferComponent buffer, osg::Image* image);
@@ -208,10 +231,16 @@ class OSG_EXPORT CameraNode : public Transform, public CullSettings
struct Attachment
{
GLenum _internalFormat;
ref_ptr<Image> _image;
ref_ptr<Texture> _texture;
unsigned int _face;
Attachment():
_internalFormat(GL_NONE),
_level(0),
_face(0) {}
GLenum _internalFormat;
ref_ptr<Image> _image;
ref_ptr<Texture> _texture;
unsigned int _level;
unsigned int _face;
};
typedef std::map< BufferComponent, Attachment> BufferAttachmentMap;
@@ -219,7 +248,6 @@ class OSG_EXPORT CameraNode : public Transform, public CullSettings
BufferAttachmentMap& getBufferAttachmentMap() { return _bufferAttachmentMap; }
const BufferAttachmentMap& getBufferAttachmentMap() const { return _bufferAttachmentMap; }
public:
@@ -243,6 +271,9 @@ class OSG_EXPORT CameraNode : public Transform, public CullSettings
RenderOrder _renderOrder;
DrawBufferList _drawBufferList;
GLenum _readBuffer;
RenderTargetImplementation _renderTargetImplementation;
BufferAttachmentMap _bufferAttachmentMap;

3
src/osg/CameraNode.cpp
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@@ -124,9 +124,10 @@ void CameraNode::attach(BufferComponent buffer, GLenum internalFormat)
_bufferAttachmentMap[buffer]._internalFormat = internalFormat;
}
void CameraNode::attach(BufferComponent buffer, osg::Texture* texture, unsigned int face)
void CameraNode::attach(BufferComponent buffer, osg::Texture* texture, unsigned int level, unsigned int face)
{
_bufferAttachmentMap[buffer]._texture = texture;
_bufferAttachmentMap[buffer]._level = level;
_bufferAttachmentMap[buffer]._face = face;
}