DrawIndexedPrimitiveUP这个函数

最近被DrawIndexedPrimitiveUP这个函数搞崩了好几次,甚至连显卡的Blue Screen Of Death也出来凑热闹了,所以需要总结一下它崩溃的可能原因,理清下头绪:
1.与OpenGL的glXXXPointer一样,如果指针内存错误,崩溃是肯定的,这种bug比较好找.
DirectX的原因更复杂:
2.DrawIndexedPrimitiveUP不直接崩溃,而是在Present的时候崩溃.可能SetIndices的索引缓冲指针是野指针,LPDIRECT3DVERTEXDECLARATION9是野指针.

解决方法:使用Debug Runtime排除所有异常调用,这对显卡驱动程序蓝屏崩溃或异常现象的调试十分有效,如:
Direct3D9: Decl Validator: X249: (Element Error) (Decl Element [5]) Declaration can't map to fixed function FVF because blendweight must use D3DDECLTYPE_FLOAT1/2/3/4.
Direct3D9: (ERROR) :DrawIndexedPrimitive failed.

3.又发现一种DrawIndexedPrimitiveUP错误,当错误地把索引个数作为第2个参数传入(实际上第2个参数应该是顶点个数), 导致程序在运行一段不定时间,随机地,可能地,花屏了.此时DX8报告一个驱动程序的错误:
Direct3D8: (ERROR) :Driver not handled in DrawPrimitives2
Direct3D8: (ERROR) :Driver returned error: DDERR_INVALIDPARAMS  
Direct3D8: (ERROR) :Driver failed command batch. Attempting to reset device state. The device may now be in an unstable state and the application may experience an access violation.

另:在试图安装现在的DirectX Debug Runtime时发现先前网上的资料或MSDN里都没谈到现在的安装方法:把Developer Runtime\x86里的dll复制到System32目录,然后再运行Utilities\Bin\x86\dxcpl.exe切换到Debug Rumtime模式.运行REF模式需要Debug Runtime环境!

Reference:
http://linghuye.googlepages.com/MyownlittleDirectXFAQ.mht