请问D3D中的粒子系统的ALPHA变化

jojogame

  写了个简单的粒子系统，想让每个粒子的ALPHA 随着时间逐渐减淡，顶点格式如下
struct POINTVERTEX
{
    D3DXVECTOR3 v;
    D3DXCOLOR  color;
    static const DWORD FVF = D3DFVF_XYZ | D3DFVF_DIFFUSE;
};

对color进行设置时 D3DXCOLOR(r,g,b,a);   r,g,b都有效, 只是a完全没效果，无论a是什么值

我怀疑可能是渲染状态的问题，渲染状态如下

RenderState和背景混合，背景为黑色)
m_pd3dDevice->SetRenderState (D3DRS_ALPHABLENDENABLE, TRUE);
m_pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCCOLOR);
m_pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCCOLOR);

TextureStageState:(纹理的颜色&ALPHA操作)
m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_DIFFUSE);
m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_MODULATE);

m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);

请各位帮帮忙解决下，谢啦～～

qrli

SrcBlend和DstBlend应该用SrcAlpha和InvSrcAlpha

jojogame

回楼上  我改了 还是没变化  不过比以前更暗了  但是a还是完全没效果

qrli

开启per vertex color，关闭光照

jojogame

谢谢qrli ， 现在的状态设置如下，光照已关闭，但还是不行～～

        // use alpha from texture
        pd3dDevice->SetTexture(0, m_pTexture );   //设置粒子纹理

        pd3dDevice->SetRenderState(D3DRS_COLORVERTEX, TRUE);       
        pd3dDevice->SetRenderState(D3DRS_DIFFUSEMATERIALSOURCE, D3DMCS_COLOR1);

        pd3dDevice->SetRenderState (D3DRS_ALPHABLENDENABLE, TRUE);
        pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
        pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);

        pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_DIFFUSE);
        pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_TEXTURE);
        pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_MODULATE);

        pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_DIFFUSE);
        pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG2, D3DTA_TEXTURE);
        pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);

qrli

还差 BlendOp = Add
如果还不行就是其他地方有问题了
还有最好把texture stage 1给disable了，以免别处打开后没关

jojogame

还是解决不了，不过我加了全局光和材质，实现了我想要的效果～～  谢谢qrli的一直关注。