IDirect3DDevice9::SetTextureStageState

IDirect3DDevice9::SetTextureStageState

Sets the state value for the currently assigned texture.

HRESULT SetTextureStageState(
  DWORD Stage,
  D3DTEXTURESTAGESTATETYPE Type,
  DWORD Value
);

 

中英结合

三个参数：

1.指定当前设置的纹理层序号（Or ID）。貌似只能是0-7

2.设置纹理的渲染状态，是枚举值。可以是这些东西：

typedef enum D3DTEXTURESTAGESTATETYPE
{
    D3DTSS_COLOROP = 1,
    D3DTSS_COLORARG1 = 2,
    D3DTSS_COLORARG2 = 3,
    D3DTSS_ALPHAOP = 4,
    D3DTSS_ALPHAARG1 = 5,
    D3DTSS_ALPHAARG2 = 6,
    D3DTSS_BUMPENVMAT00 = 7,
    D3DTSS_BUMPENVMAT01 = 8,
    D3DTSS_BUMPENVMAT10 = 9,
    D3DTSS_BUMPENVMAT11 = 10,
    D3DTSS_TEXCOORDINDEX = 11,
    D3DTSS_BUMPENVLSCALE = 22,
    D3DTSS_BUMPENVLOFFSET = 23,
    D3DTSS_TEXTURETRANSFORMFLAGS = 24,
    D3DTSS_COLORARG0 = 26,
    D3DTSS_ALPHAARG0 = 27,
    D3DTSS_RESULTARG = 28,
    D3DTSS_CONSTANT = 32,
    D3DTSS_FORCE_DWORD = 0x7fffffff,
} D3DTEXTURESTAGESTATETYPE, *LPD3DTEXTURESTAGESTATETYPE;

DX文档上面有详细的解释。

3.设置的状态值，根据第二个参数的不同，第三个参数具有不同的取值方法和含义。

下面来看DX的Demo-Textures:

        g_pd3dDevice->SetTexture( 0, g_pTexture );
         g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_MODULATE );
         g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
         g_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_DIFFUSE );
         g_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP, D3DTOP_DISABLE );

都什么意思呢？

这5句分别是：

1.设置g_pTexture这个纹理对象的ID撒。

2.D3DTSS_COLOROP是设置纹理颜色的混合方法，Value值属于D3DTEXTUREOP这个枚举的成员：

typedef enum D3DTEXTUREOP
{
    D3DTOP_DISABLE = 1,
    D3DTOP_SELECTARG1 = 2,
    D3DTOP_SELECTARG2 = 3,
    D3DTOP_MODULATE = 4,
    D3DTOP_MODULATE2X = 5,
    D3DTOP_MODULATE4X = 6,
    D3DTOP_ADD = 7,
    D3DTOP_ADDSIGNED = 8,
    D3DTOP_ADDSIGNED2X = 9,
    D3DTOP_SUBTRACT = 10,
    D3DTOP_ADDSMOOTH = 11,
    D3DTOP_BLENDDIFFUSEALPHA = 12,
    D3DTOP_BLENDTEXTUREALPHA = 13,
    D3DTOP_BLENDFACTORALPHA = 14,
    D3DTOP_BLENDTEXTUREALPHAPM = 15,
    D3DTOP_BLENDCURRENTALPHA = 16,
    D3DTOP_PREMODULATE = 17,
    D3DTOP_MODULATEALPHA_ADDCOLOR = 18,
    D3DTOP_MODULATECOLOR_ADDALPHA = 19,
    D3DTOP_MODULATEINVALPHA_ADDCOLOR = 20,
    D3DTOP_MODULATEINVCOLOR_ADDALPHA = 21,
    D3DTOP_BUMPENVMAP = 22,
    D3DTOP_BUMPENVMAPLUMINANCE = 23,
    D3DTOP_DOTPRODUCT3 = 24,
    D3DTOP_MULTIPLYADD = 25,
    D3DTOP_LERP = 26,
    D3DTOP_FORCE_DWORD = 0x7fffffff,
} D3DTEXTUREOP, *LPD3DTEXTUREOP;
D3DTOP_MODULATE把第一个和第二个颜色相乘输出。这个第一个(Arg1)和(Arg2)到底是什么东西呢？继续往下看撒~~
3.D3DTSS_COLORARG1 第一个颜色撒~~ 这里设置为纹理颜色
4.D3DTSS_COLORARG2 第二个颜色是定点的漫反色颜色。
5.禁用Alpha操作
 
然后咱们看看DX的BasicHLSL的Shader：
PS_OUTPUT RenderScenePS( VS_OUTPUT In,
                          uniform bool bTexture ) 
{ 
     PS_OUTPUT Output;
     // Lookup mesh texture and modulate it with diffuse
     if( bTexture )
        Output.RGBColor = tex2D(MeshTextureSampler, In.TextureUV) * In.Diffuse;
     else
         Output.RGBColor = In.Diffuse;
     return Output;
}
明白了吧~~笑~
详细的就不写了，自个儿翻DX的文档吧。