自学教程：C++ D3DXVECTOR4函数代码示例

bool ParticleSystemClass::UpdateBuffers(ID3D11DeviceContext* deviceContext)//is called every frame and rebuilds the entire dynamic vertexbuffer with the updated position of all the particles in the particle system{	int index, i;	HRESULT result;	D3D11_MAPPED_SUBRESOURCE mappedResource;	VertexType* verticesPtr;	//initialize vertex array to zeroes at first	memset(m_vertices, 0, (sizeof(VertexType) *m_vertexCount));	//build the vertex array from the particle list array. each particle is a quad of two tris	index = 0;	for(i=0; i<m_currentParticleCount; i++)	{		//bottom left		m_vertices[index].position = D3DXVECTOR3(m_particleList[i].positionX - m_particleSize, m_particleList[i].positionY - m_particleSize, m_particleList[i].positionZ);				m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(-m_particleList[i].positionX, -m_particleList[i].positionY, -m_particleList[i].positionZ));		D3DXVec3TransformCoord(			&m_vertices[index].position,			&m_vertices[index].position,				&RotateParticle(				D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ),				m_vertices[index].position,				m_particleList[i].m_rotationX,				m_particleList[i].m_rotationY,				m_particleList[i].m_rotationZ)				);		m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ));				m_vertices[index].texture = D3DXVECTOR2(0.0f, 1.0f);		m_vertices[index].color = D3DXVECTOR4(m_particleList[i].red, m_particleList[i].green, m_particleList[i].blue, 1.0f);		index++;		//top left		m_vertices[index].position = D3DXVECTOR3(m_particleList[i].positionX - m_particleSize, m_particleList[i].positionY + m_particleSize, m_particleList[i].positionZ);				m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(-m_particleList[i].positionX, -m_particleList[i].positionY, -m_particleList[i].positionZ));		D3DXVec3TransformCoord(			&m_vertices[index].position,			&m_vertices[index].position,			&RotateParticle(				D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ),				m_vertices[index].position,				m_particleList[i].m_rotationX,				m_particleList[i].m_rotationY,				m_particleList[i].m_rotationZ)				);		m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ));		m_vertices[index].texture = D3DXVECTOR2(0.0f, 0.0f);		m_vertices[index].color = D3DXVECTOR4(m_particleList[i].red, m_particleList[i].green, m_particleList[i].blue, 1.0f);		index++;		//bottom right		m_vertices[index].position = D3DXVECTOR3(m_particleList[i].positionX + m_particleSize, m_particleList[i].positionY - m_particleSize, m_particleList[i].positionZ);				m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(-m_particleList[i].positionX, -m_particleList[i].positionY, -m_particleList[i].positionZ));		D3DXVec3TransformCoord(			&m_vertices[index].position,			&m_vertices[index].position,			&RotateParticle(				D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ),				m_vertices[index].position,				m_particleList[i].m_rotationX,				m_particleList[i].m_rotationY,				m_particleList[i].m_rotationZ)				);		m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ));		m_vertices[index].texture = D3DXVECTOR2(1.0f, 1.0f);		m_vertices[index].color = D3DXVECTOR4(m_particleList[i].red, m_particleList[i].green, m_particleList[i].blue, 1.0f);		index++;		//bottom right		m_vertices[index].position = D3DXVECTOR3(m_particleList[i].positionX + m_particleSize, m_particleList[i].positionY - m_particleSize, m_particleList[i].positionZ);				m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(-m_particleList[i].positionX, -m_particleList[i].positionY, -m_particleList[i].positionZ));		D3DXVec3TransformCoord(			&m_vertices[index].position,			&m_vertices[index].position,			&RotateParticle(				D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ),				m_vertices[index].position,				m_particleList[i].m_rotationX,				m_particleList[i].m_rotationY,				m_particleList[i].m_rotationZ)				);		m_vertices[index].position = m_vertices[index].position.operator+(D3DXVECTOR3(m_particleList[i].positionX, m_particleList[i].positionY, m_particleList[i].positionZ));		m_vertices[index].texture = D3DXVECTOR2(1.0f, 1.0f);		m_vertices[index].color = D3DXVECTOR4(m_particleList[i].red, m_particleList[i].green, m_particleList[i].blue, 1.0f);//.........这里部分代码省略.........

void slides_render(float t){	Sleep(10);	if(slides_current_texture!=slides_texture)	{		if(slides_tex)		{			slides_tex->Release();			slides_tex=NULL;		}		slides_current_texture=slides_texture;		CreateThread(NULL, 0, slides_decode, NULL, 0, NULL);	}	g_pd3dDevice->BeginScene();	g_pd3dDevice->Clear( 0L, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER|D3DCLEAR_STENCIL, 0xff000000, 1.0f, 0L );    // Render the secondary color surface to the screen    struct VERTEX { D3DXVECTOR4 p; FLOAT tu, tv; 	};    VERTEX v[4];    v[0].p = D3DXVECTOR4( SX(  0) - 0.5f, SY( 48) - 0.5f, 0, 1 );  v[0].tu =   0; v[0].tv =   0;    v[1].p = D3DXVECTOR4( SX(640) - 0.5f, SY( 48) - 0.5f, 0, 1 );  v[1].tu = 1; v[1].tv =   0;    v[2].p = D3DXVECTOR4( SX(640) - 0.5f, SY(432) - 0.5f, 0, 1 );  v[2].tu = 1; v[2].tv =1;    v[3].p = D3DXVECTOR4( SX(  0) - 0.5f, SY(432) - 0.5f, 0, 1 );  v[3].tu =   0; v[3].tv = 1;	m_pd3dDevice->SetFVF( D3DFVF_XYZRHW|D3DFVF_TEX1);    m_pd3dDevice->SetTexture( 0, slides_tex );	m_pd3dDevice->SetTextureStageState( 0, D3DTSS_TEXCOORDINDEX, 0);	m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP,   D3DTOP_MODULATE );    m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE);    m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_TFACTOR);	m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_TFACTOR );	m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP,   D3DTOP_SELECTARG1 );    m_pd3dDevice->SetSamplerState( 0, D3DSAMP_ADDRESSU,  D3DTADDRESS_CLAMP );    m_pd3dDevice->SetSamplerState( 0, D3DSAMP_ADDRESSV,  D3DTADDRESS_CLAMP );	g_pd3dDevice->SetSamplerState( 0, D3DSAMP_MINFILTER , D3DTEXF_LINEAR);	g_pd3dDevice->SetSamplerState( 0, D3DSAMP_MAGFILTER , D3DTEXF_LINEAR);	int color=CLAMP(fade)*255;	m_pd3dDevice->SetRenderState( D3DRS_TEXTUREFACTOR, 0xff<<24|(0x010101*color));	m_pd3dDevice->SetRenderState( D3DRS_ZENABLE,   FALSE );    m_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, FALSE );	g_pd3dDevice->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA );	g_pd3dDevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_ZERO );    m_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, FALSE);	if(slides_tex)	    WRAP(m_pd3dDevice->DrawPrimitiveUP( D3DPT_TRIANGLEFAN, 2, v, 6*sizeof(FLOAT) ));    m_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, FALSE);    m_pd3dDevice->SetTexture( 0, NULL );	g_pd3dDevice->EndScene();	//   g_pd3dDevice->Present( NULL, NULL, NULL, NULL );}

//-------------------------------------------------------------// Name: Render()// Desc: 
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