D3D Shader实现的纹理模糊化处理 Demo

#include "Blur.h" CBlur::CBlur(LPDIRECT3DDEVICE9 device):m_pD3DDevice(device), m_pSourceTexture(NULL),m_pCMesh(NULL),m_pCShader(NULL),m_pPixelShader(NULL),m_pVertexShader(NULL) { m_pFrameBuffer[0] = NULL; m_pFrameBuffer[1] = NULL; m_pFrameSurface[0] = NULL; m_pFrameSurface[1] = NULL; } CBlur::~CBlur(void) { } void CBlur::Init(){ //load shader m_pCShader = new CShader(m_pD3DDevice); m_pVertexShader = m_pCShader->LoadVertexShader("Posteffect_blur.hlsl", "VS", "vs_2_0"); m_pPixelShader = m_pCShader->LoadPixelShader("Posteffect_blur.hlsl", "PS", "ps_2_0"); //load texture D3DXCreateTextureFromFile(m_pD3DDevice, "lena.tga",&m_pSourceTexture); UINT width = 512; UINT height = 512; //create texture m_pD3DDevice->CreateTexture(width, height, 1, D3DUSAGE_RENDERTARGET, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &m_pFrameBuffer[0], NULL); m_pD3DDevice->CreateTexture(width, height, 1, D3DUSAGE_RENDERTARGET, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &m_pFrameBuffer[1], NULL); //get surface m_pFrameBuffer[0]->GetSurfaceLevel(0, &m_pFrameSurface[0]); m_pFrameBuffer[1]->GetSurfaceLevel(0, &m_pFrameSurface[1]); } void CBlur::Render(float timeDelta){ Vertex_VT g_FullScreenQuad[4] = { {{-1.0f, -1.0f, 0.0f},{0.0f, 1.0f}}, {{ 1.0f, -1.0f, 0.0f},{1.0f, 1.0f}}, {{-1.0f, 1.0f, 0.0f},{0.0f, 0.0f}}, {{ 1.0f, 1.0f, 0.0f},{1.0f, 0.0f}} }; m_pD3DDevice->BeginScene(); m_pD3DDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0, 1.0f, 0); m_pD3DDevice->SetRenderState(D3DRS_LIGHTING, false); //pre render // 计算贴图像素的贴图坐标间距 float texW= 1.0f/512.0f; float texH = 1.0f/512.0f; const int num = 9; D3DXVECTOR4 vTexOffsetX[num], vTexOffsetY[num]; // 计算出邻近像素的贴图坐标间距 //旁边像素的权值 float weight_table[9] = {1.0f, 1.5f, 3.0f, 4.0f, 5.0f, 4.0f, 3.0f, 1.5f, 1.0f}; float sum = 0.0f; for (int i=0; i<num; i++ ) { sum += weight_table[i]; } for (int i=0; i<num; i++ ) { weight_table[i] /= sum; } //像素的位移值 float uv_offset_table[9] = {-4.0f,-3.0f, -2.0f, -1.0f, 0.0f, 1.0f, 2.0f, 3.0f, 4.0f}; for(int i=0; i != num; ++i){ vTexOffsetX[i] = D3DXVECTOR4(uv_offset_table[i] * texW, 0.0f, 0.0f, weight_table[i]); vTexOffsetY[i] = D3DXVECTOR4(0.0f, uv_offset_table[i] * texH, 0.0f, weight_table[i]); } // Direct3D9会偏移1个像素, 代入一个偏移值把它修正回来. D3DXVECTOR4 vTexOffset(texW * 0.5f, texH * 0.5f, 0.0f,1.0f); //获取当前的TARGET和SURFACE LPDIRECT3DSURFACE9 pRenderTargetBackup, pDepthStencilBackup; m_pD3DDevice->GetRenderTarget(0, &pRenderTargetBackup); m_pD3DDevice->GetDepthStencilSurface( &pDepthStencilBackup); // 使用模糊化Shader D3DXMATRIX trans; D3DXMatrixIdentity(&trans); //trans = CCamera::GetInstance()->GetViewMatrix() * CCamera::GetInstance()->GetProjMatrix(); m_pD3DDevice->SetVertexShaderConstantF(0, (float *)&trans, 4); m_pD3DDevice->SetVertexShaderConstantF(4, (float *)&vTexOffset, 1); m_pD3DDevice->SetPixelShader(m_pPixelShader); m_pD3DDevice->SetVertexShader(m_pVertexShader); // 设置顶点数据格式 m_pD3DDevice->SetFVF(D3DFVF_XYZ|D3DFVF_TEX1); //use texture m_pD3DDevice->SetTexture(0, m_pSourceTexture); m_pD3DDevice->SetDepthStencilSurface(NULL); //x_axis m_pD3DDevice->SetRenderTarget(0, m_pFrameSurface[0]); m_pD3DDevice->SetTexture(0, m_pSourceTexture); m_pD3DDevice->SetPixelShaderConstantF(0, (float *)vTexOffsetX, num); m_pD3DDevice->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, g_FullScreenQuad, sizeof(Vertex_VT)); //y-axis m_pD3DDevice->SetRenderTarget(0, m_pFrameSurface[1]); m_pD3DDevice->SetTexture(0, m_pFrameBuffer[0]); m_pD3DDevice->SetPixelShaderConstantF(0, (float*)vTexOffsetY, num); m_pD3DDevice->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, g_FullScreenQuad, sizeof(Vertex_VT)); //real render m_pD3DDevice->SetRenderTarget(0, pRenderTargetBackup); m_pD3DDevice->SetDepthStencilSurface(pDepthStencilBackup); m_pD3DDevice->SetPixelShader(NULL); m_pD3DDevice->SetVertexShader(NULL); m_pD3DDevice->SetTexture(0, m_pFrameBuffer[1]); m_pD3DDevice->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, g_FullScreenQuad, sizeof(Vertex_VT)); m_pD3DDevice->EndScene(); m_pD3DDevice->Present(0,0,0,0); }