C++ Vector4D::AsVector3D方法代码示例

void Vector4DMultiplyPosition( const VMatrix& src1, Vector const& src2, Vector4D& dst )
{
	// Make sure it works if src2 == dst
	Vector tmp;
	Vector const&v = ( &src2 == &dst.AsVector3D() ) ? static_cast<const Vector>(tmp) : src2;

	if (&src2 == &dst.AsVector3D())
	{
		VectorCopy( src2, tmp );
	}

	dst[0] = src1[0][0] * v[0] + src1[0][1] * v[1] + src1[0][2] * v[2] + src1[0][3];
	dst[1] = src1[1][0] * v[0] + src1[1][1] * v[1] + src1[1][2] * v[2] + src1[1][3];
	dst[2] = src1[2][0] * v[0] + src1[2][1] * v[1] + src1[2][2] * v[2] + src1[2][3];
	dst[3] = src1[3][0] * v[0] + src1[3][1] * v[1] + src1[3][2] * v[2] + src1[3][3];
}

//-----------------------------------------------------------------------------
// Draw a sphere
//-----------------------------------------------------------------------------
void CVMTPreviewPanel::RenderSphere( const Vector &vCenter, float flRadius, int nTheta, int nPhi )
{
	int nVertices =  nTheta * nPhi;
	int nIndices = 2 * ( nTheta + 1 ) * ( nPhi - 1 );
	
	CMatRenderContextPtr pRenderContext( MaterialSystem() );

	IMesh* pMesh = pRenderContext->GetDynamicMesh();

	CMeshBuilder meshBuilder;
	meshBuilder.Begin( pMesh, MATERIAL_TRIANGLE_STRIP, nVertices, nIndices );

	bool bIsUsingLightmap = m_Material->GetPropertyFlag( MATERIAL_PROPERTY_NEEDS_LIGHTMAP );
	bool bIsUsingBumpedLightmap = m_Material->GetPropertyFlag( MATERIAL_PROPERTY_NEEDS_BUMPED_LIGHTMAPS );

	int nLightmapWidth = m_pLightmapTexture->GetActualWidth();
	float flHalfLuxel = 0.5f / nLightmapWidth;

	//
	// Build the index buffer.
	//
	int i, j;
	for ( i = 0; i < nPhi; ++i )
	{
		for ( j = 0; j < nTheta; ++j )
		{
			float u = j / ( float )(nTheta - 1);
			float v = i / ( float )(nPhi - 1);
			float theta = ( j != nTheta-1 ) ? 2.0f * M_PI * u : 0.0f;
			float phi = M_PI * v;

			Vector vecPos;
			vecPos.x = flRadius * sin(phi) * cos(theta);
			vecPos.y = flRadius * sin(phi) * sin(theta); 
			vecPos.z = flRadius * cos(phi);
			    
			Vector vecNormal = vecPos;
			VectorNormalize( vecNormal );

			Vector4D vecTangentS;
			Vector vecTangentT;
			vecTangentS.Init( vecPos.z, -vecPos.x, 0.0f, 1.0f );
			if ( VectorNormalize( vecTangentS.AsVector3D() ) == 0.0f )
			{
				vecTangentS.Init( 1.0f, 0.0f, 0.0f, 1.0f );
			}

			CrossProduct( vecNormal, vecTangentS.AsVector3D(), vecTangentT );

			unsigned char red = (int)( u * 255.0f );
			unsigned char green = (int)( v * 255.0f );
			unsigned char blue = (int)( v * 255.0f );
			unsigned char alpha = (int)( v * 255.0f );

			vecPos += vCenter;

			float u1, u2, v1, v2;
			u1 = u2 = u;
			v1 = v2 = v;

			if ( bIsUsingLightmap )
			{
				u1 = RemapVal( u1, 0.0f, 1.0f, flHalfLuxel, 0.25 - flHalfLuxel );

				if ( bIsUsingBumpedLightmap )
				{
					u2 = 0.25f;
					v2 = 0.0f;
				}
			}
					  
			meshBuilder.Position3fv( vecPos.Base() );
			meshBuilder.Normal3fv( vecNormal.Base() );
			meshBuilder.Color4ub( red, green, blue, alpha );
			meshBuilder.TexCoord2f( 0, 2.0f * u, v );
			meshBuilder.TexCoord2f( 1, u1, v1 );
			meshBuilder.TexCoord2f( 2, u2, v2 );
			meshBuilder.TangentS3fv( vecTangentS.Base() );
			meshBuilder.TangentT3fv( vecTangentT.Base() );
			meshBuilder.BoneWeight( 0, 1.0f );
			meshBuilder.BoneMatrix( 0, 0 );
			meshBuilder.UserData( vecTangentS.Base() );
			meshBuilder.AdvanceVertex();
		}
	}

	//
	// Emit the triangle strips.
	//
	int idx = 0;
	for ( i = 0; i < nPhi - 1; ++i )
	{
		for ( j = 0; j < nTheta; ++j )
		{
			idx = nTheta * i + j;

			meshBuilder.FastIndex( idx );
//.........这里部分代码省略.........

//.........这里部分代码省略.........
			matrix3x4_t viewMatrix, viewMatrixInverse;
			AngleMatrix( angles, state.m_vecLightOrigin, viewMatrixInverse );
			MatrixInvert( viewMatrixInverse, viewMatrix );
			pShaderAPI->SetVertexShaderConstant( VERTEX_SHADER_SHADER_SPECIFIC_CONST_4, worldToTexture.Base(), 4 );
#endif
		}
#endif

		if ( bHasFoW )
		{
			pShader->BindTexture( SHADER_SAMPLER10, info.m_nFoW, -1 );

			float	vFoWSize[ 4 ];
			Vector	vMins = pShaderAPI->GetVectorRenderingParameter( VECTOR_RENDERPARM_GLOBAL_FOW_MINS );
			Vector	vMaxs = pShaderAPI->GetVectorRenderingParameter( VECTOR_RENDERPARM_GLOBAL_FOW_MAXS );
			vFoWSize[ 0 ] = vMins.x;
			vFoWSize[ 1 ] = vMins.y;
			vFoWSize[ 2 ] = vMaxs.x - vMins.x;
			vFoWSize[ 3 ] = vMaxs.y - vMins.y;
			pShaderAPI->SetVertexShaderConstant( 26, vFoWSize );
		}

		Vector4D	vRotations( DEG2RAD( params[ info.m_nRotation ]->GetFloatValue() ), DEG2RAD( params[ info.m_nRotation2 ]->GetFloatValue() ), 
								DEG2RAD( params[ info.m_nRotation3 ]->GetFloatValue() ), DEG2RAD( params[ info.m_nRotation4 ]->GetFloatValue() ) );
		pShaderAPI->SetVertexShaderConstant( 27, vRotations.Base() );

		Vector4D	vScales( params[ info.m_nScale ]->GetFloatValue() > 0.0f ? params[ info.m_nScale ]->GetFloatValue() : 1.0f, 
							 params[ info.m_nScale2 ]->GetFloatValue() > 0.0f ? params[ info.m_nScale2 ]->GetFloatValue() : 1.0f, 
							 params[ info.m_nScale3 ]->GetFloatValue() > 0.0f ? params[ info.m_nScale3 ]->GetFloatValue() : 1.0f, 
							 params[ info.m_nScale4 ]->GetFloatValue() > 0.0f ? params[ info.m_nScale4 ]->GetFloatValue() : 1.0f );
		pShaderAPI->SetVertexShaderConstant( 28, vScales.Base() );

		Vector4D vLightDir;
		vLightDir.AsVector3D() = pShaderAPI->GetVectorRenderingParameter( VECTOR_RENDERPARM_GLOBAL_LIGHT_DIRECTION );
		vLightDir.w = pShaderAPI->GetFloatRenderingParameter( FLOAT_RENDERPARM_SPECULAR_POWER );
		pShaderAPI->SetVertexShaderConstant( 29, vLightDir.Base() );


		LightState_t lightState;
		pShaderAPI->GetDX9LightState( &lightState );


#ifndef _X360
		if ( !g_pHardwareConfig->HasFastVertexTextures() )
#endif
		{
			DECLARE_DYNAMIC_VERTEX_SHADER( multiblend_vs20 );
			SET_DYNAMIC_VERTEX_SHADER_COMBO( SKINNING,      pShaderAPI->GetCurrentNumBones() > 0 );
			SET_DYNAMIC_VERTEX_SHADER( multiblend_vs20 );

			DECLARE_DYNAMIC_PIXEL_SHADER( multiblend_ps20b );
			SET_DYNAMIC_PIXEL_SHADER_COMBO( FLASHLIGHTSHADOWS, bFlashlightShadows );
			SET_DYNAMIC_PIXEL_SHADER( multiblend_ps20b );
		}
#ifndef _X360
		else
		{
			DECLARE_DYNAMIC_VERTEX_SHADER( multiblend_vs30 );
			SET_DYNAMIC_VERTEX_SHADER_COMBO( SKINNING,      pShaderAPI->GetCurrentNumBones() > 0 );
			SET_DYNAMIC_VERTEX_SHADER( multiblend_vs30 );

			DECLARE_DYNAMIC_PIXEL_SHADER( multiblend_ps30 );
			SET_DYNAMIC_PIXEL_SHADER( multiblend_ps30 );
		}
#endif