source: OGRE/trunk/src/OgreSolidHalfBoundingBox.cpp @ 117

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

#include "OgreSimpleRenderable.h"
#include "OgreHardwareBufferManager.h"
#include "OgreCamera.h"
#include "OgreMaterialManager.h"


namespace Ogre {

#define POSITION_BINDING 0
//-----------------------------------------------------------------------
SolidHalfBoundingBox::SolidHalfBoundingBox()
{
        SetOcclusionQueryMaterial();
        
        mRenderOp.vertexData->vertexCount = 8;
    mRenderOp.operationType = RenderOperation::OT_TRIANGLE_FAN; 
}
//-----------------------------------------------------------------------
void SolidHalfBoundingBox::SetupBoundingBoxVertices(const AxisAlignedBox& aab, 
                                                                                                        const bool isFirstHalf) 
{
        const Vector3& min = aab.getMinimum();
    const Vector3& max = aab.getMaximum();

        // fill 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 (isFirstHalf)
        {
                *pPos++ = min.x; *pPos++ = max.y; *pPos++ = max.z; //011
                *pPos++ = min.x; *pPos++ = min.y; *pPos++ = max.z; //001
                *pPos++ = max.x; *pPos++ = min.y; *pPos++ = max.z; //101
                *pPos++ = max.x; *pPos++ = max.y; *pPos++ = max.z; //111
                
                *pPos++ = max.x; *pPos++ = max.y; *pPos++ = min.z; //110
                *pPos++ = min.x; *pPos++ = max.y; *pPos++ = min.z; //010
                *pPos++ = min.x; *pPos++ = min.y; *pPos++ = min.z; //000
                *pPos++ = min.x; *pPos++ = min.y; *pPos++ = max.z; //001
        }
        else
        // fan 2
        {
                *pPos++ = max.x; *pPos++ = min.y; *pPos++ = min.z; //100
                *pPos++ = min.x; *pPos++ = min.y; *pPos++ = min.z; //000                                        
                *pPos++ = min.x; *pPos++ = max.y; *pPos++ = min.z; //010
                *pPos++ = max.x; *pPos++ = max.y; *pPos++ = min.z; //110

                *pPos++ = max.x; *pPos++ = max.y; *pPos++ = max.z; //111
                *pPos++ = max.x; *pPos++ = min.y; *pPos++ = max.z; //101
                *pPos++ = min.x; *pPos++ = min.y; *pPos++ = max.z; //001
                *pPos++ = min.x; *pPos++ = min.y; *pPos++ = min.z; //000
        }

    vbuf->unlock();
}
//-----------------------------------------------------------------------
void SolidHalfBoundingBox::SetupBoundingBox(const AxisAlignedBox& aab, 
                                                                                        const bool isFirstHalf) 
{
        // init the vertices to the aabb
        SetupBoundingBoxVertices(aab, isFirstHalf);

        Real sqLen = std::max(aab.getMaximum().squaredLength(), 
                                                  aab.getMinimum().squaredLength());
    mRadius = Math::Sqrt(sqLen);

    // setup the bounding box of this SimpleRenderable
        setBoundingBox(aab);
}
//-----------------------------------------------------------------------
void SolidHalfBoundingBox::SetOcclusionQueryMaterial( void )
{
        m_pMaterial = MaterialManager::getSingleton().getByName("Visibility/QueryMaterial");

        if (m_pMaterial.isNull())
        {
                m_pMaterial = MaterialManager::getSingleton().
                        create("Visibility/QueryMaterial", ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
        }

        m_pMaterial->setColourWriteEnabled(false);
        m_pMaterial->setDepthWriteEnabled(false);
        m_pMaterial->setLightingEnabled(false);

        setMaterial("Visibility/QueryMaterial");
}

} // namespace Ogre