On Sun, 2012-06-03 at 14:30 -0700, Kenneth Graunke wrote:
> On 06/03/2012 10:15 AM, Matt Turner wrote:
> > It seems that we already do this.
> > ---
> > src/glsl/TODO | 3 ---
> > 1 files changed, 0 insertions(+), 3 deletions(-)
> >
> > diff --git a/src/glsl/TODO b/src/glsl/TODO
> > index eb73fc2..bd077a8 100644
> > --- a/src/glsl/TODO
> > +++ b/src/glsl/TODO
> > @@ -6,9 +6,6 @@
> > constant index values. For others it is more complicated. Perhaps these
> > cases should be silently converted to uniforms?
> >
> > -- Implement support for ir_binop_dot in opt_algebraic.cpp. Perform
> > - transformations such as "dot(v, vec3(0.0, 1.0, 0.0))" -> v.y.
> > -
> > - Track source locations throughout the IR. There are currently several
> > places where we cannot emit line numbers for errors (and currently emit
> > 0:0)
> > because we've "lost" the line number information. This is particularly
>
> We do? Considering there's no instance of ir_binop_dot in
> opt_algebraic.cpp, I'm a bit skeptical :)
I could of course be mistaken, but consider the following fragment
shader:
varying vec3 light;
void main() {
const vec4 DiffuseColor = vec4(0.9, 0.9, 0.9, 1.0);
float DiffuseTerm = dot(vec3(0.0, 1.0, 0.0), light);
gl_FragColor = DiffuseColor * DiffuseTerm;
}
>From this, we generate this GLSL IR:
(
(declare (temporary ) float light_y)
(declare (out ) vec4 gl_FragColor)
(function main
(signature void
(parameters
)
(
(assign (x) (var_ref gl_FragColor) (expression float * (constant
float (0.900000)) (var_ref light_y) ) )
(assign (y) (var_ref gl_FragColor) (expression float * (constant
float (0.900000)) (var_ref light_y) ) )
(assign (z) (var_ref gl_FragColor) (expression float * (constant
float (0.900000)) (var_ref light_y) ) )
(assign (w) (var_ref gl_FragColor) (var_ref light_y) )
))
)
)
I don't claim to understand how (obviously there's no ir_binop_dot in
opt_algebraic.cpp, so) but it looks like we're already getting the
result of the TODO.
The other part that I thought opt_algebraic.cpp's ir_binop_dot case
should handle was zero vectors, but they're already handled as well. I
presume because dot is lowered into mul/madd which already handle zero
vectors.
Does this sound right, or did I miss some piece?
Thanks,
Matt
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