C++ VMatrix::Identity方法代码示例

void MatrixBuildPerspective( VMatrix &dst, float fovX, float fovY, float zNear, float zFar )
{
	// FIXME: collapse all of this into one matrix after we figure out what all should be in here.
	float width = 2 * zNear * tan( fovX * ( M_PI/180.0f ) * 0.5f );
	float height = 2 * zNear * tan( fovY * ( M_PI/180.0f ) * 0.5f );

	memset( dst.Base(), 0, sizeof( dst ) );
	dst[0][0]  = 2.0F * zNear / width;
	dst[1][1]  = 2.0F * zNear / height;
	dst[2][2] = -zFar / ( zNear - zFar );
	dst[3][2] = 1.0f;
	dst[2][3] = zNear * zFar / ( zNear - zFar );

	// negate X and Y so that X points right, and Y points up.
	VMatrix negateXY;
	negateXY.Identity();
	negateXY[0][0] = -1.0f;
	negateXY[1][1] = -1.0f;
	MatrixMultiply( negateXY, dst, dst );
	
	VMatrix addW;
	addW.Identity();
	addW[0][3] = 1.0f;
	addW[1][3] = 1.0f;
	addW[2][3] = 0.0f;
	MatrixMultiply( addW, dst, dst );
	
	VMatrix scaleHalf;
	scaleHalf.Identity();
	scaleHalf[0][0] = 0.5f;
	scaleHalf[1][1] = 0.5f;
	MatrixMultiply( scaleHalf, dst, dst );
}

//-----------------------------------------------------------------------------
// Purpose: Generates a view matrix based on our current yaw, pitch, and roll.
//			The view matrix does not consider FOV or clip plane distances.
//-----------------------------------------------------------------------------
void CCamera::BuildViewMatrix()
{
	// The camera transformation is produced by multiplying roll * yaw * pitch.
	// This will transform a point from world space into quake camera space, 
	// which is exactly what we want for our view matrix. However, quake
	// camera space isn't the same as material system camera space, so
	// we're going to have to apply a transformation that goes from quake
	// camera space to material system camera space.
	
	CameraIdentityMatrix( m_ViewMatrix );

	RotateAroundAxis(m_ViewMatrix, m_fPitch, 0 );
	RotateAroundAxis(m_ViewMatrix, m_fRoll, 1);
	RotateAroundAxis(m_ViewMatrix, m_fYaw, 2);

	// Translate the viewpoint to the world origin.
	VMatrix TempMatrix;
	TempMatrix.Identity();
	TempMatrix.SetTranslation( -m_ViewPoint );

	m_ViewMatrix = m_ViewMatrix * TempMatrix;

	m_ViewProjMatrix = m_ProjMatrix * m_ViewMatrix;
	m_ViewProjMatrix.InverseGeneral( m_InvViewProjMatrix );
}

//.........这里部分代码省略.........
		{
			// is our target a player?
			C_BaseEntity *pTargetEnt = pLocalPlayer->GetObserverTarget();
			if ( pTargetEnt && pTargetEnt->IsPlayer() )
			{
				// does our target have the flag and are they carrying the flag we're currently drawing?
				C_TFPlayer *pTarget = static_cast< C_TFPlayer* >( pTargetEnt );
				if ( pTarget->HasTheFlag() && ( pTarget->GetItem() == pEnt ) )
				{
					pMaterial = m_BlueMaterialNoArrow;
				}
			}
		}
	}
	else if (pEnt->GetTeamNumber() == TF_TEAM_GREEN)
	{
		pMaterial = m_GreenMaterial;

		if (pLocalPlayer && (pLocalPlayer->GetObserverMode() == OBS_MODE_IN_EYE))
		{
			// is our target a player?
			C_BaseEntity *pTargetEnt = pLocalPlayer->GetObserverTarget();
			if (pTargetEnt && pTargetEnt->IsPlayer())
			{
				// does our target have the flag and are they carrying the flag we're currently drawing?
				C_TFPlayer *pTarget = static_cast< C_TFPlayer* >(pTargetEnt);
				if (pTarget->HasTheFlag() && (pTarget->GetItem() == pEnt))
				{
					pMaterial = m_GreenMaterialNoArrow;
				}
			}
		}
	}
	else if (pEnt->GetTeamNumber() == TF_TEAM_YELLOW)
	{
		pMaterial = m_YellowMaterial;

		if (pLocalPlayer && (pLocalPlayer->GetObserverMode() == OBS_MODE_IN_EYE))
		{
			// is our target a player?
			C_BaseEntity *pTargetEnt = pLocalPlayer->GetObserverTarget();
			if (pTargetEnt && pTargetEnt->IsPlayer())
			{
				// does our target have the flag and are they carrying the flag we're currently drawing?
				C_TFPlayer *pTarget = static_cast< C_TFPlayer* >(pTargetEnt);
				if (pTarget->HasTheFlag() && (pTarget->GetItem() == pEnt))
				{
					pMaterial = m_YellowMaterialNoArrow;
				}
			}
		}
	}

	int x = 0;
	int y = 0;
	ipanel()->GetAbsPos( GetVPanel(), x, y );
	int nWidth = GetWide();
	int nHeight = GetTall();

	CMatRenderContextPtr pRenderContext( materials );
	pRenderContext->MatrixMode( MATERIAL_MODEL );
	pRenderContext->PushMatrix(); 

	VMatrix panelRotation;
	panelRotation.Identity();
	MatrixBuildRotationAboutAxis( panelRotation, Vector( 0, 0, 1 ), GetAngleRotation() );
//	MatrixRotate( panelRotation, Vector( 1, 0, 0 ), 5 );
	panelRotation.SetTranslation( Vector( x + nWidth/2, y + nHeight/2, 0 ) );
	pRenderContext->LoadMatrix( panelRotation );

	IMesh *pMesh = pRenderContext->GetDynamicMesh( true, NULL, NULL, pMaterial );

	CMeshBuilder meshBuilder;
	meshBuilder.Begin( pMesh, MATERIAL_QUADS, 1 );

	meshBuilder.TexCoord2f( 0, 0, 0 );
	meshBuilder.Position3f( -nWidth/2, -nHeight/2, 0 );
	meshBuilder.Color4ub( 255, 255, 255, 255 );
	meshBuilder.AdvanceVertex();

	meshBuilder.TexCoord2f( 0, 1, 0 );
	meshBuilder.Position3f( nWidth/2, -nHeight/2, 0 );
	meshBuilder.Color4ub( 255, 255, 255, 255 );
	meshBuilder.AdvanceVertex();

	meshBuilder.TexCoord2f( 0, 1, 1 );
	meshBuilder.Position3f( nWidth/2, nHeight/2, 0 );
	meshBuilder.Color4ub( 255, 255, 255, 255 );
	meshBuilder.AdvanceVertex();

	meshBuilder.TexCoord2f( 0, 0, 1 );
	meshBuilder.Position3f( -nWidth/2, nHeight/2, 0 );
	meshBuilder.Color4ub( 255, 255, 255, 255 );
	meshBuilder.AdvanceVertex();

	meshBuilder.End();

	pMesh->Draw();
	pRenderContext->PopMatrix();
}

void EmitClipPortalGeometry( node_t *pHeadNode, portal_t *pPortal, int iSrcArea, dareaportal_t *dp )
{
	// Build a list of all the points in portals from the same original face.
	CUtlVector<portal_t*> portals;
	FindPortalsLeadingToArea_R( 
		pHeadNode, 
		iSrcArea, 
		dp->otherarea, 
		&pPortal->plane,
		portals );

	CUtlVector<Vector> points;
	for( int iPortal=0; iPortal < portals.Size(); iPortal++ )
	{
		portal_t *pPointPortal = portals[iPortal];
		winding_t *pWinding = pPointPortal->winding;
		for( int i=0; i < pWinding->numpoints; i++ )
		{
			points.AddToTail( pWinding->p[i] );
		}
	}

	// Get the 2D convex hull.

	//// First transform them into a plane.
	QAngle vAngles;
	Vector vecs[3];

	VectorAngles( pPortal->plane.normal, vAngles );
	AngleVectors( vAngles, &vecs[0], &vecs[1], &vecs[2] );
	VMatrix mTransform;
	mTransform.Identity();
	mTransform.SetBasisVectors( vecs[0], vecs[1], vecs[2] );
	VMatrix mInvTransform = mTransform.Transpose();

	int i;
	CUtlVector<Vector2D> points2D;
	for( i=0; i < points.Size(); i++ )
	{
		Vector vTest = mTransform * points[i];
		points2D.AddToTail( Vector2D( vTest.y, vTest.z ) );
	}

	// Build the hull.
	int indices[512];
	int nIndices = Convex2D( points2D.Base(), points2D.Size(), indices, 512 );

	// Output the hull.
	dp->m_FirstClipPortalVert = g_nClipPortalVerts;
	dp->m_nClipPortalVerts = nIndices;

	if ( nIndices >= 32 )
	{
		Warning( "Warning: area portal has %d verts. Could be a vbsp bug.\n", nIndices );
	}

	if( dp->m_FirstClipPortalVert + dp->m_nClipPortalVerts >= MAX_MAP_PORTALVERTS )
	{
		Vector *p = pPortal->winding->p;
		Error( "MAX_MAP_PORTALVERTS (probably a broken areaportal near %.1f %.1f %.1f ", p->x, p->y, p->z );
	}
	
	for( i=0; i < nIndices; i++ )
	{
		g_ClipPortalVerts[g_nClipPortalVerts] = points[ indices[i] ];
		++g_nClipPortalVerts;
	}
}

				//ConMsg("Angle = %f\n", angle);
				pRenderContext->Rotate(angle, 0.0f, 0.0f, 1.0f);

				//VMatrix rotationMatrix2 = SetupMatrixAngles(view->GetViewSetup()->angles);
				//pRenderContext->MultMatrix(rotationMatrix2);
				//VMatrix rotationMatrix = rotationMatrix2.InverseTR(); //SetupMatrixAngles(-(view->GetViewSetup()->angles));

				rotationMatrix = SetupMatrixAxisRot(Vector(0.0f, 0.0f, 1.0f), -angle);
				invRotationMatrix = SetupMatrixAxisRot(Vector(0.0f, 0.0f, 1.0f), angle);
				Vector eye = view->GetViewSetup()->origin;
				transformedEye = (eye-center)*(1.0f/m_flRadius);
				transformedEye = rotationMatrix.ApplyRotation(transformedEye);
			}
			else
			{
				rotationMatrix.Identity();
				invRotationMatrix.Identity();
				transformedEye.Init();
				angle = 0.0f;
			}

			if(sv_surface_use_tiler.GetBool())
			{
				tiler->beginFrame(Point3D(0.0f, 0.0f, 0.0f), (void*)&pRenderContext, !(sv_surface_draw_margin.GetBool()));
			}
			else
			{
				sweepRenderer->beginFrame(!(sv_surface_draw_margin.GetBool()), (void*)&pRenderContext);
				sweepRenderer->setOffset(Point3D(0.0f, 0.0f, 0.0f));
				//sweepRenderer->beginTile();
			}