Changeset 9448 for code/branches/shaders/src/orxonox/graphics/LensFlare.cc

Timestamp:

Nov 14, 2012, 9:16:18 PM (11 years ago)

Author:

davidsa

Message:

Added Hardware Occlusion Query Capabilities for use in dynamic flare effects, this is still a pretty static implemenation, meaning it will fail with mutltiple HOQ objects on screen, also needs some tidying up and documentation at a later point

File:

• code/branches/shaders/src/orxonox/graphics/LensFlare.cc (modified) (5 diffs)

code/branches/shaders/src/orxonox/graphics/LensFlare.cc

@@ -38 +38 @@
 #include "graphics/Billboard.h"
 #include "CameraManager.h"
+#include "RenderQueueListener.h"
+
+#include <OgreSphere.h>
+#include <OgreRenderWindow.h>
 
 namespace orxonox
@@ -43 +47 @@
     CreateFactory(LensFlare);
     
-    LensFlare::LensFlare(BaseObject* creator) : StaticEntity(creator)
+    LensFlare::LensFlare(BaseObject* creator) : StaticEntity(creator), scale_(1.0f)
     {
         RegisterObject(LensFlare);
@@ -59 +63 @@
     {
         SUPER(LensFlare, XMLPort, xmlelement, mode);
+        XMLPortParam(LensFlare, "scale", setScale, getScale, xmlelement, mode).defaultValues(1.0f);
     }
     
     void LensFlare::registerVariables()
     {
-      
+        registerVariable(this->scale_, VariableDirection::ToClient, new NetworkCallback<LensFlare>(this, &LensFlare::updateBillboardPositions));
     }
     
     void LensFlare::createBillboards()
     {
+        this->occlusionBillboard_ = new Billboard(this);
+        this->occlusionBillboard_->setMaterial("lensflare/hoq");
+        this->occlusionBillboard_->setPosition(this->getPosition());
+        this->occlusionBillboard_->setVisible(false);
+        this->occlusionBillboard_->setRenderQueueGroup(RENDER_QUEUE_HOQ);
+        this->attach(this->occlusionBillboard_);
+        
         Billboard* burst = new Billboard(this);
         burst->setMaterial("lensflare/burst");
@@ -79 +91 @@
         Ogre::Camera* camera=CameraManager::getInstance().getActiveCamera()->getOgreCamera(); //get active Ogre Camera Instance, so we can check whether the light source is visible
         bool lightIsVisible=camera->isVisible(this->getPosition()); //is the light source visible from our point of view?
-        int scale=camera->getPosition().distance(this->getPosition());
+        this->cameraDistance_=camera->getPosition().distance(this->getPosition());
+        unsigned int dimension=this->cameraDistance_*this->scale_;
         
-        Billboard* burst=static_cast<Billboard*>(getAttachedObject(0));
+        this->occlusionBillboard_->setPosition(this->getPosition());
+        this->occlusionBillboard_->setVisible(lightIsVisible);
+        this->occlusionBillboard_->setDefaultDimensions(dimension,dimension);
+        
+        Billboard* burst=static_cast<Billboard*>(getAttachedObject(1));
         burst->setPosition(this->getPosition());
         burst->setVisible(lightIsVisible);
-        burst->setDefaultDimensions(scale,scale);
+        burst->setDefaultDimensions(dimension,dimension);
     }
 
@@ -92 +109 @@
         {
             updateBillboardPositions();
+            if(this->occlusionBillboard_->isVisible()) {
+                unsigned int dimension=this->cameraDistance_*this->scale_;
+                Ogre::Sphere* sphere=new Ogre::Sphere(this->getPosition(),dimension*0.25);
+                Ogre::Camera* camera=CameraManager::getInstance().getActiveCamera()->getOgreCamera();
+                float left, right, top, bottom;
+                camera->projectSphere(*sphere,&left,&top,&right,&bottom);//approximate maximum pixel count of billboard with a sphere
+                delete sphere;
+                
+                Ogre::RenderWindow* window = GraphicsManager::getInstance().getRenderWindow();
+                float maxCount=(right-left)*(top-bottom)*window->getWidth()*window->getHeight()*0.25;
+                float pixelCount=this->getScene()->getRenderQueueListener()->getPixelCount();//get pixel count
+                float ratio=pixelCount/maxCount;
+                //orxout() << "maxCount: " << maxCount << " HOQ: " << pixelCount << " ratio: " << ratio << std::endl;
+                ColourValue* colour = new ColourValue(1.0f,1.0f,1.0f,ratio); //adjust alpha of billboard
+                
+                Billboard* burst=static_cast<Billboard*>(getAttachedObject(1));
+                burst->setColour(*colour);
+                delete colour;
+            }
         }
     }