D3D9 effect研究及学习

一、程序部分

1、几个全局变量的定义：

ID3DXEffect*                g_pEffect = NULL;D3DXMATRIXA16               g_mCenterWorld;D3DXHANDLE                  g_hWorld = NULL;D3DXHANDLE                  g_hWorldViewProjection = NULL;D3DXHANDLE                  g_hTechniqueRenderScene = NULL;

2、设备检查

bool IsDeviceAcceptable(D3DCAPS9* pCaps,D3DFORMAT AdapterFormat,D3DFORMAT BackBufferFormat,bool bWindowed,void* pUserContext){    if( pCaps->PixelShaderVersion < D3DPS_VERSION( 2, 0 ) )  //检查像素着色器        return false;

                                                //通常要检查相关的纹理，深度，模版是否被支持

IDirect3D9* pD3D = DXUTGetD3D9Object(); if( FAILED( pD3D->CheckDeviceFormat( pCaps->AdapterOrdinal, pCaps->DeviceType, AdapterFormat, D3DUSAGE_QUERY_POSTPIXELSHADER_BLENDING, D3DRTYPE_TEXTURE, BackBufferFormat ) ) ) return false; return true;

}

3、效果文件创建载入

HRESULT D3DXCreateEffectFromFile(  _In_   LPDIRECT3DDEVICE9 pDevice,    //D3D设备  _In_   LPCTSTR pSrcFile,             //待载入的文件名或路径  _In_   const D3DXMACRO *pDefines,  _In_   LPD3DXINCLUDE pInclude,  _In_   DWORD Flags,  _In_   LPD3DXEFFECTPOOL pPool,  _Out_  LPD3DXEFFECT *ppEffect,  _Out_  LPD3DXBUFFER *ppCompilationErrors);

typedef struct D3DXMACRO {  LPCSTR Name;  LPCSTR Definition;} D3DXMACRO, *LPD3DXMACRO;

HRESULT OnCreateLoadFile(IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,void* pUserContext ){    DXUTFindDXSDKMediaFileCch( str, MAX_PATH, TEXT( "CompiledEffect.fxo" ) );  //查找文件路径    V_RETURN( D3DXCreateEffectFromFile( pd3dDevice, str, NULL, NULL, D3DXFX_NOT_CLONEABLE, NULL, &g_pEffect, NULL ) );    return S_OK;}

4、获得效果文件中的变量句柄

HRESULT GetEffectParameterHandle( IDirect3DDevice9* pd3dDevice,                                const D3DSURFACE_DESC* pBackBufferSurfaceDesc, void* pUserContext ){    D3DXCOLOR colorMtrlDiffuse( 1.0f, 1.0f, 1.0f, 1.0f );    D3DXCOLOR colorMtrlAmbient( 0.35f, 0.35f, 0.35f, 0 );

    g_pEffect->SetVector( "g_MaterialAmbientColor", ( D3DXVECTOR4* )&colorMtrlAmbient );  //设置全局变量    g_pEffect->SetVector( "g_MaterialDiffuseColor", ( D3DXVECTOR4* )&colorMtrlDiffuse );    g_hTechniqueRenderScene = g_pEffect->GetTechniqueByName( "RenderScene" );              //获得效果    g_hTime = g_pEffect->GetParameterByName( NULL, "g_fTime" );    g_hWorld = g_pEffect->GetParameterByName( NULL, "g_mWorld" );    g_hWorldViewProjection = g_pEffect->GetParameterByName( NULL, "g_mWorldViewProjection" );    g_hMeshTexture = g_pEffect->GetParameterByName( NULL, "g_MeshTexture" );    return S_OK;}

5、设置数据

void SetEffectParater(double fTime, float fElapsedTime, void* pUserContext){    D3DXMATRIXA16 mWorld;    D3DXMATRIXA16 mView;    D3DXMATRIXA16 mProj;    D3DXMATRIXA16 mWorldViewProjection;    mWorld = g_mCenterWorld * *g_Camera.GetWorldMatrix();    mProj = *g_Camera.GetProjMatrix();    mView = *g_Camera.GetViewMatrix();    mWorldViewProjection = mWorld * mView * mProj;    g_pEffect->SetMatrix( g_hWorldViewProjection, &mWorldViewProjection );    g_pEffect->SetMatrix( g_hWorld, &mWorld );    g_pEffect->SetFloat( g_hTime, ( float )fTime );}

6、渲染

void RenderEffect(IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext){    pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB( 0, 45, 50, 70 ), 1.0f, 0 );    pd3dDevice->BeginScene()

        UINT iPass, cPasses;                           //效果渲染        g_pEffect->Begin( &cPasses, 0);        for( iPass = 0; iPass < cPasses; iPass++ )        {            g_pEffect->BeginPass( iPass );

                          //其他事务渲染

            g_pEffect->EndPass();

        }        g_pEffect->End();

     pd3dDevice->EndScene();}

7、释放相关资源

void OnLostDevice(){    if( g_pEffect )        g_pEffect->OnLostDevice();}void OnDestroyDevice(){    SAFE_RELEASE( g_pEffect );}

二、fx文件部分

//全局变量

float4 g_MaterialAmbientColor;float4 g_MaterialDiffuseColor;float3 g_LightDir = normalize(float3(1.0f, 1.0f, -1.0f));float4 g_LightAmbient = { 0.2f, 0.2f, 0.2f, 0.2f };float4 g_LightDiffuse = { 1.0f, 1.0f, 1.0f, 1.0f };texture g_RenderTargetTexture;//全屏渲染目标纹理float g_fTime;float4x4 g_mWorld;float4x4 g_mWorldViewProjection;sampler RenderTargetSampler = sampler_state{    Texture = <g_RenderTargetTexture>;    MinFilter = POINT;      MagFilter = POINT;    MipFilter = NONE;    AddressU = Clamp;    AddressV = Clamp;};struct VS_OUTPUT{    float4 Position   : POSITION;    float4 Diffuse    : COLOR0;     float2 TextureUV  : TEXCOORD0;};VS_OUTPUT RenderSceneVS( float4 vPos : POSITION,                          float3 vNormal : NORMAL,                         float2 vTexCoord0 : TEXCOORD0 ){    VS_OUTPUT Output;    float3 vNormalWorldSpace;      float4 vAnimatedPos = vPos;    vAnimatedPos.x *= (1.0 + cos(g_fTime)/10);    vAnimatedPos.y *= (1.0 + sin(g_fTime)/10);    vAnimatedPos.z *= (1.0 + cos(g_fTime)/10);        Output.Position = mul(vAnimatedPos, g_mWorldViewProjection);    vNormalWorldSpace = normalize(mul(vNormal, (float3x3)g_mWorld));    Output.Diffuse.rgb = g_MaterialDiffuseColor * g_LightDiffuse * max(0,dot(vNormalWorldSpace, g_LightDir)) +                          g_MaterialAmbientColor * g_LightAmbient;       Output.Diffuse.a = 1.0f;     Output.TextureUV = vTexCoord0;     return Output;    }struct PS_OUTPUT{    float4 RGBColor : COLOR0;};PS_OUTPUT RenderScenePS( VS_OUTPUT In ) {     PS_OUTPUT Output;    Output.RGBColor = tex2D(MeshTextureSampler, In.TextureUV) * In.Diffuse;    return Output;}technique RenderScene{    pass P0    {          ZENABLE = true;                                          //Z-buffer        VertexShader = compile vs_2_0 RenderSceneVS();        PixelShader  = compile ps_2_0 RenderScenePS();    }}