Commen=
t # 3
on bug 11124=
1
from Pierre=
-Eric Pelloux-Prayer
Here's my understanding of the issue.
This shader uses 2 passes:
- the first pass has BufferA as input and output and does:
if (first frame)
// init bufferA content
else
// do something useful
- the 2nd pass has BufferA as input and does:
N =3D texelFetch(bufferA)
for(i=3D0; i < N; i++)
// do something
The problem here is the "// init bufferA content": it fails to in=
itialize the
buffer content properly, leading to an infinite loop in the 2nd pass.
The exact code is:
if (iFrame=3D=3D0) { O -=3D O; return; }
If one replaces this line with:
if (iFrame=3D=3D0) { O =3D vec4(0.0f); return; }
The shader works fine (you can test the modified version here:
https://www.shadertoy.com=
/view/wtSXzw ).