New subject: DDraw, wined3d (d3d8, d3d9) and OpenGL32 in Mac OSXx86 + stack fudging

30 Apr 2006


      Here is the patch thus far -- It is not clean or anything... (cvs -q diff - 
straight from my tree)
--I think this patch will work and allow you to run specific ogl and d3d 
apps (with enough stack fudging see below)
--Here is an example of the stack fudging
--Since this is too hard to add to all entry points... I did not bother 
doing it en mass (only for functions that were causing crashes for demos -- 
waiting for gcc goodness)
void WINAPI SomeApiEntryPoint()
{
//begin stack alignment
  asm("pushl 0(%ebp)");//save ebp`
  asm("movl %esp, 0(%ebp)");//hope that 0(%ebp) is not used in function 
//save esp -- ebp -> esp -> ebp`
  asm("subl %ebp, %esp");//calc n
  asm("addl %esp, %esp");//n*2
  asm("addl %ebp, %esp");//n*2+esp
  asm("subl $0x10, %esp");//pad out stack
  asm("andl $0xFFFFFFF0, %esp");//align the stack
//end stack alignment
...
//body
...
//begin stack restore
  asm("movl 0(%ebp), %esp");//restore esp -- ebp -> esp -> ebp`
  asm("popl 0(%ebp)");//restore ebp` + esp
//end stack restore
return;
}
WEEEEEEEEE so fun
- Nick

RE: DDraw, wined3d (d3d8, d3d9) and OpenGL32 in Mac OSX + stack fudging -- x86 only