stephan mantler » Post Tags » programming http://www.stephanmantler.com/blog stephan mantler: photography, sports, computer graphics. Fri, 20 Aug 2010 06:49:45 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 More on the shader http://www.stephanmantler.com/blog/2005/11/29/more-on-the-shader/ http://www.stephanmantler.com/blog/2005/11/29/more-on-the-shader/#comments Tue, 29 Nov 2005 12:32:06 +0000 stephan mantler http://www.stephanmantler.com/wordpress/?p=557 I’ve just taken a look at the FX Shader Compiler’s output for the broken shader, and what changes when I comment a few lines so that it doesn’t crash my machine any more… and figured out what the problem is.

Here’s a fairly minimal shader that crashes my machine:
PixelShader = asm
{
ps_3_0
defi i0, 100,0,0,0
def c0, 0.01, 0.5, 0, 0
mov r0, c0.zzzz
rep i0
add r0.x, r0.x, c0.x
if_ge r0.x, c0.y
add r0.y, r0.y, c0.x
break
endif
endrep
mov oC0, r0
};

Und hier ist einer, der funktioniert:
And here is one that works:
PixelShader = asm
{
ps_3_0
defi i0, 100,0,0,0
def c0, 0.01, 0.5, 0, 0
mov r0, c0.zzzz
rep i0
add r0.x, r0.x, c0.x
if_ge r0.x, c0.y
add r0.y, r0.y, c0.x
endif
endrep
mov oC0, r0
};

So, break is broken (sic!) if used inside an if construct.

]]> http://www.stephanmantler.com/blog/2005/11/29/more-on-the-shader/feed/ 0