FGFS-4.1/OpenSceneGraph
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Implemented the beginings of the osgProducer::GraphicsContexImplementation.

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Added options into osgprerender for controlling how to do the pre rendering i.e.
--fbo, --pbuffer, --fb --window, and also added the option for controlling the
window size with --width and --height.
This commit is contained in:
Robert Osfield
2005-07-21 19:27:19 +00:00
parent 7776924407
commit 302c58fc93
10 changed files with 277 additions and 131 deletions
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232
examples/osgprerender/osgprerender.cpp
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@@ -107,136 +107,139 @@ class MyGeometryCallback :
};
osg::Node* createPreRenderSubGraph(osg::Node* subgraph)
osg::Node* createPreRenderSubGraph(osg::Node* subgraph, unsigned tex_width, unsigned tex_height, osg::CameraNode::RenderTargetImplementation renderImplementation)
{
if (!subgraph) return 0;
// create the quad to visualize.
osg::Geometry* polyGeom = new osg::Geometry();
polyGeom->setSupportsDisplayList(false);
osg::Vec3 origin(0.0f,0.0f,0.0f);
osg::Vec3 xAxis(1.0f,0.0f,0.0f);
osg::Vec3 yAxis(0.0f,0.0f,1.0f);
osg::Vec3 zAxis(0.0f,-1.0f,0.0f);
float height = 100.0f;
float width = 200.0f;
int noSteps = 20;
osg::Vec3Array* vertices = new osg::Vec3Array;
osg::Vec3 bottom = origin;
osg::Vec3 top = origin; top.z()+= height;
osg::Vec3 dv = xAxis*(width/((float)(noSteps-1)));
osg::Vec2Array* texcoords = new osg::Vec2Array;
osg::Vec2 bottom_texcoord(0.0f,0.0f);
osg::Vec2 top_texcoord(0.0f,1.0f);
osg::Vec2 dv_texcoord(1.0f/(float)(noSteps-1),0.0f);
for(int i=0;i<noSteps;++i)
{
vertices->push_back(top);
vertices->push_back(bottom);
top+=dv;
bottom+=dv;
texcoords->push_back(top_texcoord);
texcoords->push_back(bottom_texcoord);
top_texcoord+=dv_texcoord;
bottom_texcoord+=dv_texcoord;
}
// pass the created vertex array to the points geometry object.
polyGeom->setVertexArray(vertices);
polyGeom->setTexCoordArray(0,texcoords);
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
polyGeom->setColorArray(colors);
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,vertices->size()));
unsigned int tex_width = 2048;
unsigned int tex_height = 2048;
// new we need to add the texture to the Drawable, we do so by creating a
// StateSet to contain the Texture StateAttribute.
osg::StateSet* stateset = new osg::StateSet;
// create a group to contain the flag and the pre rendering camera.
osg::Group* parent = new osg::Group;
// texture to render to and to use for rendering of flag.
osg::Texture2D* texture = new osg::Texture2D;
texture->setTextureSize(tex_width, tex_height);
texture->setInternalFormat(GL_RGBA);
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
polyGeom->setStateSet(stateset);
// first create the geometry of the flag of which to view.
{
// create the to visualize.
osg::Geometry* polyGeom = new osg::Geometry();
polyGeom->setUpdateCallback(new MyGeometryCallback(origin,xAxis,yAxis,zAxis,1.0,1.0/width,0.2f));
polyGeom->setSupportsDisplayList(false);
osg::Geode* geode = new osg::Geode();
geode->addDrawable(polyGeom);
osg::Vec3 origin(0.0f,0.0f,0.0f);
osg::Vec3 xAxis(1.0f,0.0f,0.0f);
osg::Vec3 yAxis(0.0f,0.0f,1.0f);
osg::Vec3 zAxis(0.0f,-1.0f,0.0f);
float height = 100.0f;
float width = 200.0f;
int noSteps = 20;
osg::Vec3Array* vertices = new osg::Vec3Array;
osg::Vec3 bottom = origin;
osg::Vec3 top = origin; top.z()+= height;
osg::Vec3 dv = xAxis*(width/((float)(noSteps-1)));
osg::Vec2Array* texcoords = new osg::Vec2Array;
osg::Vec2 bottom_texcoord(0.0f,0.0f);
osg::Vec2 top_texcoord(0.0f,1.0f);
osg::Vec2 dv_texcoord(1.0f/(float)(noSteps-1),0.0f);
for(int i=0;i<noSteps;++i)
{
vertices->push_back(top);
vertices->push_back(bottom);
top+=dv;
bottom+=dv;
texcoords->push_back(top_texcoord);
texcoords->push_back(bottom_texcoord);
top_texcoord+=dv_texcoord;
bottom_texcoord+=dv_texcoord;
}
osg::CameraNode* camera = new osg::CameraNode;
// set up the background color and clear mask.
camera->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// pass the created vertex array to the points geometry object.
polyGeom->setVertexArray(vertices);
polyGeom->setTexCoordArray(0,texcoords);
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
polyGeom->setColorArray(colors);
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
polyGeom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,vertices->size()));
// new we need to add the texture to the Drawable, we do so by creating a
// StateSet to contain the Texture StateAttribute.
osg::StateSet* stateset = new osg::StateSet;
stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
polyGeom->setStateSet(stateset);
polyGeom->setUpdateCallback(new MyGeometryCallback(origin,xAxis,yAxis,zAxis,1.0,1.0/width,0.2f));
osg::Geode* geode = new osg::Geode();
geode->addDrawable(polyGeom);
parent->addChild(geode);
const osg::BoundingSphere& bs = subgraph->getBound();
if (!bs.valid())
{
return subgraph;
}
float znear = 1.0f*bs.radius();
float zfar = 3.0f*bs.radius();
// 2:1 aspect ratio as per flag geomtry below.
float proj_top = 0.25f*znear;
float proj_right = 0.5f*znear;
// then create the camera node to do the render to texture
{
osg::CameraNode* camera = new osg::CameraNode;
znear *= 0.9f;
zfar *= 1.1f;
// set up the background color and clear mask.
camera->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// set up projection.
camera->setProjectionMatrixAsFrustum(-proj_right,proj_right,-proj_top,proj_top,znear,zfar);
const osg::BoundingSphere& bs = subgraph->getBound();
if (!bs.valid())
{
return subgraph;
}
// 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));
float znear = 1.0f*bs.radius();
float zfar = 3.0f*bs.radius();
// set viewport
camera->setViewport(0,0,tex_width,tex_height);
// set the camera to render before the main camera.
camera->setRenderOrder(osg::CameraNode::PRE_RENDER);
// tell the camera to use OpenGL frame buffer object where supported.
camera->setRenderTargetImplmentation(osg::CameraNode::FRAME_BUFFER_OBJECT);
// attach the texture and use it as the color buffer.
camera->attach(osg::CameraNode::COLOR_BUFFER, texture);
// 2:1 aspect ratio as per flag geomtry below.
float proj_top = 0.25f*znear;
float proj_right = 0.5f*znear;
// add subgraph to render
camera->addChild(subgraph);
// create a group to contain the flag and the pre rendering camera.
osg::Group* parent = new osg::Group;
parent->addChild(camera);
parent->addChild(geode);
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));
// set viewport
camera->setViewport(0,0,tex_width,tex_height);
// set the camera to render before the main camera.
camera->setRenderOrder(osg::CameraNode::PRE_RENDER);
// tell the camera to use OpenGL frame buffer object where supported.
camera->setRenderTargetImplmentation(renderImplementation);
// attach the texture and use it as the color buffer.
camera->attach(osg::CameraNode::COLOR_BUFFER, texture);
// add subgraph to render
camera->addChild(subgraph);
parent->addChild(camera);
}
return parent;
}
@@ -267,6 +270,19 @@ int main( int argc, char **argv )
return 1;
}
unsigned tex_width = 1024;
unsigned tex_height = 512;
while (arguments.read("--width", tex_width)) {}
while (arguments.read("--height", tex_height)) {}
osg::CameraNode::RenderTargetImplementation renderImplementation = osg::CameraNode::FRAME_BUFFER_OBJECT;
while (arguments.read("--fbo")) { renderImplementation = osg::CameraNode::FRAME_BUFFER_OBJECT; }
while (arguments.read("--pbuffer")) { renderImplementation = osg::CameraNode::PIXEL_BUFFER; }
while (arguments.read("--fb")) { renderImplementation = osg::CameraNode::FRAME_BUFFER; }
while (arguments.read("--window")) { renderImplementation = osg::CameraNode::SEPERATE_WINDOW; }
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
@@ -288,7 +304,6 @@ int main( int argc, char **argv )
osg::Node* loadedModel = osgDB::readNodeFiles(arguments);
if (!loadedModel)
{
// write_usage(osg::notify(osg::NOTICE),argv[0]);
return 1;
}
@@ -300,8 +315,7 @@ int main( int argc, char **argv )
loadedModelTransform->setUpdateCallback(nc);
osg::Group* rootNode = new osg::Group();
// rootNode->addChild(loadedModelTransform);
rootNode->addChild(createPreRenderSubGraph(loadedModelTransform));
rootNode->addChild(createPreRenderSubGraph(loadedModelTransform,tex_width,tex_height, renderImplementation));
// add model to the viewer.