C++ Mat4x4::BuildRotationX方法代码示例

//
// D3DSkyNode11::VOnRestore						- Chapter 16, page 556
//
HRESULT D3DSkyNode11::VOnRestore(Scene *pScene)
{
	HRESULT hr;

	V_RETURN(SceneNode::VOnRestore(pScene) );

	m_camera = pScene->GetCamera();

	SAFE_RELEASE(m_pVertexBuffer);
	SAFE_RELEASE(m_pIndexBuffer);

	V_RETURN (m_VertexShader.OnRestore(pScene) );
	V_RETURN (m_PixelShader.OnRestore(pScene) );

	m_numVerts = 20;

    // Fill the vertex buffer. We are setting the tu and tv texture
    // coordinates, which range from 0.0 to 1.0
    D3D11Vertex_UnlitTextured *pVertices = GCC_NEW D3D11Vertex_UnlitTextured[m_numVerts];
	GCC_ASSERT(pVertices && "Out of memory in D3DSkyNode11::VOnRestore()");
	if (!pVertices)
		return E_FAIL;

	// Loop through the grid squares and calc the values
	// of each index. Each grid square has two triangles:
	//
	//		A - B
	//		| / |
	//		C - D

	D3D11Vertex_UnlitTextured skyVerts[4];
	D3DCOLOR skyVertColor = 0xffffffff;
	float dim = 50.0f;

	skyVerts[0].Pos = Vec3( dim, dim, dim ); skyVerts[0].Uv = Vec2(1.0f, 0.0f); 
	skyVerts[1].Pos = Vec3(-dim, dim, dim ); skyVerts[1].Uv = Vec2(0.0f, 0.0f);
	skyVerts[2].Pos = Vec3( dim,-dim, dim ); skyVerts[2].Uv = Vec2(1.0f, 1.0f);  
	skyVerts[3].Pos = Vec3(-dim,-dim, dim ); skyVerts[3].Uv = Vec2(0.0f, 1.0f);

	Vec3 triangle[3];
	triangle[0] = Vec3(0.f,0.f,0.f);
	triangle[1] = Vec3(5.f,0.f,0.f);
	triangle[2] = Vec3(5.f,5.f,0.f);

	Vec3 edge1 = triangle[1]-triangle[0];
	Vec3 edge2 = triangle[2]-triangle[0];

	Vec3 normal;
	normal = edge1.Cross(edge2);
	normal.Normalize();

	Mat4x4 rotY;
	rotY.BuildRotationY(GCC_PI/2.0f);
	Mat4x4 rotX;
	rotX.BuildRotationX(-GCC_PI/2.0f);
	
	m_sides = 5;

	for (DWORD side = 0; side < m_sides; side++)
	{
		for (DWORD v = 0; v < 4; v++)
		{
			Vec4 temp;
			if (side < m_sides-1)
			{
				temp = rotY.Xform(Vec3(skyVerts[v].Pos));
			}
			else
			{
				skyVerts[0].Uv = Vec2(1.0f, 1.0f); 
				skyVerts[1].Uv = Vec2(1.0f, 1.0f);
				skyVerts[2].Uv = Vec2(1.0f, 1.0f); 
				skyVerts[3].Uv = Vec2(1.0f, 1.0f);

				temp = rotX.Xform(Vec3(skyVerts[v].Pos));
			}
			skyVerts[v].Pos = Vec3(temp.x, temp.y, temp.z);
		}
		memcpy(&pVertices[side*4], skyVerts, sizeof(skyVerts));
	}

    D3D11_BUFFER_DESC bd;
	ZeroMemory( &bd, sizeof(bd) );
    bd.Usage = D3D11_USAGE_DEFAULT;
    bd.ByteWidth = sizeof( D3D11Vertex_UnlitTextured ) * m_numVerts;
    bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
	bd.CPUAccessFlags = 0;
    D3D11_SUBRESOURCE_DATA InitData;
	ZeroMemory( &InitData, sizeof(InitData) );
    InitData.pSysMem = pVertices;
    hr = DXUTGetD3D11Device()->CreateBuffer( &bd, &InitData, &m_pVertexBuffer );
	SAFE_DELETE(pVertices);
    if( FAILED( hr ) )
        return hr;


	// Loop through the grid squares and calc the values
//.........这里部分代码省略.........

HRESULT D3DSkyNode9::OnRestore(Scene* pScene)
{
	// call base class restore
	SceneNode::OnRestore(pScene);

	m_Camera = pScene->GetCamera();
	m_NumVerts = 20;

	CB_COM_RELEASE(m_pVerts);
	if (FAILED(DXUTGetD3D9Device()->CreateVertexBuffer(
		m_NumVerts * sizeof(D3D9Vertex_ColoredTextured),
		D3DUSAGE_WRITEONLY, D3D9Vertex_ColoredTextured::FVF,
		D3DPOOL_MANAGED, &m_pVerts, NULL)))
	{
		return E_FAIL;
	}

	// fill the vertex buffer -- we're setting the tu and tv texture coordinates (0.0 - 1.0)
	// this binds the m_pVerts d3d buffer to pVertices
	D3D9Vertex_ColoredTextured* pVertices;
	if (FAILED(m_pVerts->Lock(0, 0, (void**)&pVertices, 0)))
	{
		return E_FAIL;
	}

	// loop through the grid squares and calculate the values
	// of each index. each grid has two triangles:
	//
	//	A - B
	//	| / |
	//	C - D
	
	D3D9Vertex_ColoredTextured skyVerts[4];
	D3DCOLOR skyVertColor = 0xffffffff;
	float dim = 50.0f;

	skyVerts[0].position = Vec3(dim, dim, dim);
	skyVerts[0].color = skyVertColor;
	skyVerts[0].tu = 1.0f; // top right texture coord
	skyVerts[0].tv = 0.0f;

	skyVerts[1].position = Vec3(-dim, dim, dim);
	skyVerts[1].color = skyVertColor;
	skyVerts[1].tu = 0.0f; // top left texture coord
	skyVerts[1].tv = 0.0f;

	skyVerts[2].position = Vec3(dim, -dim, dim);
	skyVerts[2].color = skyVertColor;
	skyVerts[2].tu = 1.0f; // bottom right texture coord
	skyVerts[2].tv = 1.0f;

	skyVerts[3].position = Vec3(-dim, -dim, dim);
	skyVerts[3].color = skyVertColor;
	skyVerts[3].tu = 0.0f; // bottom left texture coord
	skyVerts[3].tv = 1.0f;

	// triangle
	//	   2
	//	 / |
	//  0--1
	Vec3 triangle[3];
	triangle[0] = Vec3(0.0f, 0.0f, 0.0f);
	triangle[1] = Vec3(5.0f, 0.0f, 0.0f);
	triangle[2] = Vec3(5.0f, 5.0f, 0.0f);
	
	Vec3 edge1 = triangle[1] - triangle[0];
	Vec3 edge2 = triangle[2] - triangle[0];

	Vec3 normal;
	normal = edge1.Cross(edge2);
	normal.Normalize();

	Mat4x4 rotY;
	rotY.BuildRotationY(CB_PI / 2.0f);
	Mat4x4 rotX;
	rotX.BuildRotationX(-CB_PI / 2.0f);

	m_Sides = 5;

	// loop through all the sides of a sky box and set the texture coords
	for (DWORD side = 0; side < m_Sides; side++)
	{
		for (DWORD v = 0; v < 4; v++)
		{
			Vec4 temp;
			if (side < m_Sides - 1)
			{
				temp = rotY.Transform(Vec3(skyVerts[v].position));
			}
			else
			{
				skyVerts[0].tu = 1.0f; skyVerts[0].tv = 1.0f;
				skyVerts[1].tu = 1.0f; skyVerts[1].tv = 0.0f;
				skyVerts[2].tu = 0.0f; skyVerts[2].tv = 1.0f;
				skyVerts[3].tu = 0.0f; skyVerts[3].tv = 0.0f;

				temp = rotX.Transform(Vec3(skyVerts[v].position));
			}
			skyVerts[v].position = Vec3(temp.x, temp.y, temp.z);
		}
//.........这里部分代码省略.........