HGE没有减法混合，如何自己扩展？

流川枫

HGE没有减法混合，如何自己扩展？
HGE内核原代码中的_setblendmode方法，其中没有发现blend_alphaadd标志，不过有blend_coloradd标志等。HGE给DX纹理设置了d3dtop_add标志以实现blend_coloradd效果，DX有d3dtop_subtract标志但HGE却没提供blend_colorsubtract标志以实现纹理减法。换句话说，我只要加入给DX纹理设置d3dtop_subtract标志就可以实现纹理减法。当然我想实现的并不是blend_colorsubtract而是减法的blend_alpha。但奇怪的是在HGE内核原代码中搜索不到blend_alphaadd是在哪里处理的，我想知道，如何扩展透明减法功能。

流川枫

晕，怎么发了两遍

流川枫

最不理解的是blend_alphaadd和blend_colormul还有blend_nozwrite标志宏的值怎么都是0？但是位或后却会对设置有影响！？哪载？

funcman

HGE核心才千行左右，花几天扫一眼吧~

void HGE_Impl::_SetBlendMode(int blend)

{

        if((blend & BLEND_ALPHABLEND) != (CurBlendMode & BLEND_ALPHABLEND))

        {

                if(blend & BLEND_ALPHABLEND) pD3DDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);

                else pD3DDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);

        }



    if((blend & BLEND_ZWRITE) != (CurBlendMode & BLEND_ZWRITE))

        {

                if(blend & BLEND_ZWRITE) pD3DDevice->SetRenderState(D3DRS_ZWRITEENABLE, TRUE);

                else pD3DDevice->SetRenderState(D3DRS_ZWRITEENABLE, FALSE);

        }                       

       

        if((blend & BLEND_COLORADD) != (CurBlendMode & BLEND_COLORADD))

        {

                if(blend & BLEND_COLORADD) pD3DDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_ADD);

                else pD3DDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);

        }



        CurBlendMode = blend;

}

看这个，实际上设置渲染模式时根本没测试那几个设置为0的标志。

流川枫

所以才奇怪啊，为什么明明几个标志值都是0，而且还是位或的，HGE为什么还能知道我有没有设置这个标志？

DraculaLin

看??
我自己加的
http://www.huosoft.com/bbs/ShowPost.asp?ThreadID=5824

procedure THGEImpl.SetBlendMode(const Blend: Integer);
begin
{
  if ((Blend and BLEND_ALPHABLEND) <> (FCurBlendMode and BLEND_ALPHABLEND)) then begin
    if ((Blend and BLEND_ALPHABLEND) <> 0) then
      FD3DDevice.SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA)
    else
      FD3DDevice.SetRenderState(D3DRS_DESTBLEND,D3DBLEND_ONE);
  end;

  if ((Blend and BLEND_ZWRITE) <> (FCurBlendMode and BLEND_ZWRITE)) then begin
    if ((Blend and BLEND_ZWRITE) <> 0) then
      FD3DDevice.SetRenderState(D3DRS_ZWRITEENABLE,1)
    else
      FD3DDevice.SetRenderState(D3DRS_ZWRITEENABLE,0);
  end;

  if ((Blend and BLEND_COLORADD) <> (FCurBlendMode and BLEND_COLORADD)) then begin
    if ((Blend and BLEND_COLORADD) <> 0) then
      FD3DDevice.SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_ADD)
    else
      FD3DDevice.SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_MODULATE);
  end;
  }

  FD3DDevice.SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_MODULATE);
  case Blend of
       Blend_Default:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);
       end;
       Blend_ColorAdd:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND,D3DBLEND_ONE);
         FD3DDevice.SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_ADD);
       end;
       Blend_Add:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ONE);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);

       end;
       Blend_SrcAlphaAdd:
       begin
          FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
          FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);
       end;
       Blend_SrcColor:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCCOLOR);
       end;
       BLEND_SrcColorAdd:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);
       end;
       Blend_Invert:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_INVDESTCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ZERO);
       end;
       Blend_SrcBright:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_SRCCOLOR);
       end;
       Blend_Multiply:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ZERO);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_SRCCOLOR);
       end;
       Blend_InvMultiply:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ZERO);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCCOLOR);
       end;
       Blend_MultiplyAlpha:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ZERO);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_SRCALPHA);
       end;
       Blend_InvMultiplyAlpha:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ZERO);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
       end;
       Blend_DestBright:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_DESTCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_DESTCOLOR);
       end;
       Blend_InvSrcBright:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_INVSRCCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCCOLOR);
       end;
       Blend_InvDestBright:
       begin
          FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_INVDESTCOLOR);
          FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVDESTCOLOR);
       end;
       Blend_Bright:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
         FD3DDevice.SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE2X);
       end;
       Blend_BrightAdd:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
         FD3DDevice.SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE4X);
       end;
       Blend_GrayScale:
       begin
         FD3DDevice.SetRenderState(D3DRS_ALPHABLENDENABLE, Integer(False));
         FD3DDevice.SetRenderState(D3DRS_TextureFactor,Integer((ARGB(255,255,155,155))));
         FD3DDevice.SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_DOTPRODUCT3);
         FD3DDevice.SetTextureStageState(0,D3DTSS_COLORARG2,D3DTA_TFACTOR);
       end;
       Blend_Light:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_DESTCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);
         FD3DDevice.SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE2X);
       end;
       Blend_LightAdd:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_DESTCOLOR);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);
         FD3DDevice.SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE4X);
       end;
       Blend_Add2X:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);
         FD3DDevice.SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE2X);
       end;
       Blend_OneColor:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND,  D3DBLEND_SRCALPHA);
         FD3DDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
         FD3DDevice.SetTextureStageState(0, D3DTSS_COLOROP, 25);
         FD3DDevice.SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
       end;
       Blend_XOR:
       begin
         FD3DDevice.SetRenderState(D3DRS_SRCBLEND,  D3DBLEND_INVDESTCOLOR);
         FD3DDEvice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCCOLOR);
       end;


  end;

  FCurBlendMode := Blend;
end;
http://www.huosoft.com/bbs/ShowPost.asp?ThreadID=5824

funcman

因为标志宏是非此即彼的关系啊。没设BLEND_COLORADD就意味着设置了BLEND_COLORMUL。