#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

	
	if (isFirstHalf) // fan 1
	{
		*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