[DX9]谁可以设置一个带有半透明色的png图片的透明度？

轩辕崇正

问题：一个含有半透明色的png格式图片，要求以100的透明度渲染出来。（固定管道）

这问题可不简单喔。 [em9]

轩辕崇正

解决了：
完整的设置如下
C/C++ code
    pd3dDevice->SetRenderState(D3DRS_LIGHTING,FALSE);
    pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE,TRUE);
    pd3dDevice->SetRenderState(D3DRS_SRCBLEND,D3DBLEND_SRCALPHA);
    pd3dDevice->SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);

    pd3dDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);

//使定点颜色的alpha和帖图的alpha相乘
    pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
    pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);

    pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);



C/C++ code
顶点里面的diffuse含有aphpha分量
struct Custom_Vertex
{
    D3DXVECTOR4 pos_rhw;
    D3DCOLOR diffuse;
    D3DXVECTOR2 uv;
};
const DWORD fvf = D3DFVF_XYZRHW|D3DFVF_DIFFUSE|D3DFVF_TEX1;

Custom_Vertex verts[] =
{
    {D3DXVECTOR4(0.0f,300.0f,0.0f,1.0), D3DCOLOR_ARGB(125,255,255,255) ,D3DXVECTOR2(0.0,1.0)},
    {D3DXVECTOR4(0.0f,0.0f,0.0f,1.0), D3DCOLOR_ARGB(125,255,255,255) ,D3DXVECTOR2(0.0,0.0)},   
    {D3DXVECTOR4(400.0f,0.0f,0.0f,1.0), D3DCOLOR_ARGB(125,255,255,255) ,D3DXVECTOR2(1.0,0.0)},
    {D3DXVECTOR4(0.0f,300.0f,0.0f,1.0), D3DCOLOR_ARGB(125,255,255,255) ,D3DXVECTOR2(0.0,1.0)},
    {D3DXVECTOR4(400.0f,0.0f,0.0f,1.0), D3DCOLOR_ARGB(125,255,255,255) ,D3DXVECTOR2(1.0,0.0)},   
    {D3DXVECTOR4(400.0f,300.0f,0.0f,1.0), D3DCOLOR_ARGB(125,255,255,255) ,D3DXVECTOR2(1.0,1.0)}
};


修改这个alpha可以指定透明度。


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等　级：
9
#3楼 得分：0回复于：2010-09-13 14:18:42如果你的颜色要频繁修改，建议用这个
C/C++ code
//这个颜色就会和你的纹理混合
        pd3dDevice->SetTextureStageState(0, D3DTSS_CONSTANT, D3DCOLOR_ARGB(128,256,256,256));
    pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
    pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_CONSTANT);

    pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);


---xingzhe2001

emughost

用AlphaTest应该更好点吧.........

轩辕崇正

emughost: Re:[DX9]谁可以设置一个带有半透明色的png图片的透明度？

用AlphaTest应该更好点吧.........

我问的不是这个。

zl15860106981

我认为可以在顶点上设定顶点的alpha值为0，然后渲染图片时，设定alpha的来源为顶点颜色，这样应该可以达到目的~