source: trunk/VUT/OcclusionCullingSceneManager/src/OgreSolidHalfBoundingBox.cpp @ 51

#include "OgreStableHeaders.h"
#include "OgreSolidHalfBoundingBox.h"

#include "OgreSimpleRenderable.h"
#include "OgreHardwareBufferManager.h"
#include "OgreCamera.h"
//#include <windows.h>

namespace Ogre {
    #define POSITION_BINDING 0
        //-----------------------------------------------------------------------
        SolidHalfBoundingBox::SolidHalfBoundingBox(bool isFirstHalf)
                :WireBoundingBox(), mIsFirstHalf(isFirstHalf)
    {
                mRenderOp.vertexData->vertexCount = 8;
        mRenderOp.operationType = RenderOperation::OT_TRIANGLE_FAN; 
        }
        //-----------------------------------------------------------------------
        void SolidHalfBoundingBox::setupBoundingBoxVertices(const AxisAlignedBox& aab) {

                Vector3 vmax = aab.getMaximum();
                Vector3 vmin = aab.getMinimum();
                
                
                Real sqLen = std::max(vmax.squaredLength(), vmin.squaredLength());
        mRadius = Math::Sqrt(sqLen);
                
                Real maxx = vmax.x;
                Real maxy = vmax.y;
                Real maxz = vmax.z;
                
                Real minx = vmin.x;
                Real miny = vmin.y;
                Real minz = vmin.z;
                
                // fill in the Vertex buffer: 12 lines with 2 endpoints each make up a box
        HardwareVertexBufferSharedPtr vbuf =
            mRenderOp.vertexData->vertexBufferBinding->getBuffer(POSITION_BINDING);     

        float* pPos = static_cast<float*>(
            vbuf->lock(HardwareBuffer::HBL_DISCARD));

                //     5+------+7
                //     /|     /|
                //    / |    / |
                //   / 1+---/--+3
                // 2+------+6 /    y   z
                //  | /    | /     |  /
                //  |/     |/      |/
                // 0+------+4      *---x

                // fan 1
                if(mIsFirstHalf)
                {
                        *pPos++ = minx; *pPos++ = maxy; *pPos++ = maxz; //011
                        *pPos++ = minx; *pPos++ = miny; *pPos++ = maxz; //001
                        *pPos++ = maxx; *pPos++ = miny; *pPos++ = maxz; //101
                        *pPos++ = maxx; *pPos++ = maxy; *pPos++ = maxz; //111
                        
                        *pPos++ = maxx; *pPos++ = maxy; *pPos++ = minz; //110
                        *pPos++ = minx; *pPos++ = maxy; *pPos++ = minz; //010
                        *pPos++ = minx; *pPos++ = miny; *pPos++ = minz; //000
                        *pPos++ = minx; *pPos++ = miny; *pPos++ = maxz; //001

                }
                else
                // fan 2
                {
                        *pPos++ = maxx; *pPos++ = miny; *pPos++ = minz; //100
                        *pPos++ = minx; *pPos++ = miny; *pPos++ = minz; //000                                   
                        *pPos++ = minx; *pPos++ = maxy; *pPos++ = minz; //010
                        *pPos++ = maxx; *pPos++ = maxy; *pPos++ = minz; //110

                        *pPos++ = maxx; *pPos++ = maxy; *pPos++ = maxz; //111
                        *pPos++ = maxx; *pPos++ = miny; *pPos++ = maxz; //101
                        *pPos++ = minx; *pPos++ = miny; *pPos++ = maxz; //001
                        *pPos++ = minx; *pPos++ = miny; *pPos++ = minz; //000
                }

        vbuf->unlock();
        }

        void SolidHalfBoundingBox::setupBoundingBox(const AxisAlignedBox& aabb) 
    {
                // init the vertices to the aabb
                SolidHalfBoundingBox::setupBoundingBoxVertices(aabb);

        // setup the bounding box of this SimpleRenderable
                setBoundingBox(aabb);
        }
        // Override this method to prevent parent transforms (rotation,translation,scale)
    void SolidHalfBoundingBox::getWorldTransforms( Matrix4* xform ) const
    {
                // return identity matrix to prevent parent transforms
        *xform = Matrix4::IDENTITY;
    }
}