[Mesa-dev] [PATCH v2 2/3] mesa: validate size parameters for glTexStorage*Multisample
Timothy Arceri
t_arceri at yahoo.com.au
Mon Aug 17 14:30:25 PDT 2015
On Mon, 2015-08-17 at 08:12 +0300, Tapani Pälli wrote:
>
> On 08/14/2015 04:01 PM, Timothy Arceri wrote:
> > On Fri, 2015-08-14 at 08:55 +0300, Tapani Pälli wrote:
> > >
> > > On 08/13/2015 11:54 AM, Timothy Arceri wrote:
> > > > I've sent a couple of follow-up patches I notice when reviewing
> > > > this.
> > > >
> > > >
> > > > On Thu, 2015-08-13 at 09:30 +0300, Tapani Pälli wrote:
> > > > > v2: code cleanup
> > > > >
> > > > > Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
> > > > > ---
> > > > > src/mesa/main/teximage.c | 24 ++++++++++++++++++++++++
> > > > > 1 file changed, 24 insertions(+)
> > > > >
> > > > > diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
> > > > > index d35dc12..add7438 100644
> > > > > --- a/src/mesa/main/teximage.c
> > > > > +++ b/src/mesa/main/teximage.c
> > > > > @@ -5782,6 +5782,18 @@ _mesa_TexImage3DMultisample(GLenum target,
> > > > > GLsizei
> > > > > samples,
> > > > > "glTexImage3DMultisample");
> > > > > }
> > > > >
> > > > > +static bool
> > > > > +valid_texstorage_ms_parameters(GLsizei width, GLsizei height,
> > > > > GLsizei
> > > > > depth,
> > > > > + GLsizei samples, unsigned dims)
> > > > > +{
> > > > > + GET_CURRENT_CONTEXT(ctx);
> > > > > +
> > > > > + if (_mesa_tex_storage_invalid_dim(width, height, depth) ||
> > > > > samples < 1)
> > > >
> > > >
> > > > Rather than do the samples < 1 check here you should move it to
> > > > _mesa_texture_image_multisample as the spec says "An
> > > > INVALID_VALUE error is
> > > > generated ifsamplesis zero." for glTexImage*Multisample too.
> > > >
> > > > With that change you could change all the calls below to something
> > > > like
> > > >
> > > > if (_mesa_tex_storage_invalid_dim(width, height, depth)) {
> > > > _mesa_error(ctx, GL_INVALID_VALUE,
> > > > "glTexStorage2DMultisample()"
> > > > return;
> > > > }
> > >
> > > Would it be OK if we do possible unification for checking samples
> > > parameter after these patches? My goal here is to do check for
> > > glTexStorage*Multisample only. I don't feel comfortable changing
> > > checks
> > > for other functions at the same time, that should deserve it's own
> > > commit so it's easier to bisect later.
> > >
> >
> > There is no reason to split the change into two patches. The correct
> > change is to update _mesa_texture_image_multisample (which I will
> > rename texture_image_multisample once your patch lands) to do the
> > samples check. The only other user is image*Multisample and the spec
> > clearly states that this is also an error when 0. That spec says it
> > undefined what happens when this is negative but we already throw an
> > error via _mesa_check_sample_count().
>
> OK, how about land your patch first so that we can test for regressions.
> If nothing regresses after your changes then I can safely land mine.
The changes are pushed to master :)
>
> > You don't have to touch _mesa_check_sample_count() that change should
> > be in another patch which I already sent [1] feel free not to review it
> > :)
> >
> > Doing it the way your suggesting is code churn for no gain, it just
> > means your code needs to be deleted and replaced with the change I'm
> > suggesting later anyway, so why not just fix it right the first time.
>
> Yes, maybe I'm too pessimistic that nothing would break. It's just that
> typically something does and I've been really hard trying to not break
> ES 3.0 conformance (which includes ES 2.0 tests too) while making ES 3.1
> changes. We are very close to being ES 3.0 conformant (just one test
> failing ATM).
Nice work. I can see where your coming from but if we are going to break
things now is the time to do it while people like yourself are keeping a close
eye on things :)
>
> > Also feel free to keep your valid_texstorage_ms_parameters() function I
> > was just suggesting an alternative to having another function call.
> >
> >
> > [1]
> > http://lists.freedesktop.org/archives/mesa-dev/2015-August/091588.html
> > > > > {
> > > > > + _mesa_error(ctx, GL_INVALID_VALUE,
> > > > > "glTexStorage%uDMultisample()",
> > > > > dims);
> > > > > + return false;
> > > > > + }
> > > > > + return true;
> > > > > +}
> > > > > void GLAPIENTRY
> > > > > _mesa_TexStorage2DMultisample(GLenum target, GLsizei samples,
> > > > > @@ -5795,6 +5807,9 @@ _mesa_TexStorage2DMultisample(GLenum
> > > > > target, GLsizei
> > > > > samples,
> > > > > if (!texObj)
> > > > > return;
> > > > >
> > > > > + if (!valid_texstorage_ms_parameters(width, height, 1,
> > > > > samples, 2))
> > > > > + return;
> > > > > +
> > > > > _mesa_texture_image_multisample(ctx, 2, texObj, target,
> > > > > samples,
> > > > > internalformat, width,
> > > > > height, 1,
> > > > > fixedsamplelocations,
> > > > > GL_TRUE,
> > > > > @@ -5814,6 +5829,9 @@ _mesa_TexStorage3DMultisample(GLenum
> > > > > target, GLsizei
> > > > > samples,
> > > > > if (!texObj)
> > > > > return;
> > > > >
> > > > > + if (!valid_texstorage_ms_parameters(width, height, depth,
> > > > > samples, 3))
> > > > > + return;
> > > > > +
> > > > > _mesa_texture_image_multisample(ctx, 3, texObj, target,
> > > > > samples,
> > > > > internalformat, width,
> > > > > height, depth,
> > > > > fixedsamplelocations,
> > > > > GL_TRUE,
> > > > > @@ -5834,6 +5852,9 @@ _mesa_TextureStorage2DMultisample(GLuint
> > > > > texture,
> > > > > GLsizei samples,
> > > > > if (!texObj)
> > > > > return;
> > > > >
> > > > > + if (!valid_texstorage_ms_parameters(width, height, 1,
> > > > > samples, 2))
> > > > > + return;
> > > > > +
> > > > > _mesa_texture_image_multisample(ctx, 2, texObj, texObj
> > > > > ->Target, samples,
> > > > > internalformat, width,
> > > > > height, 1,
> > > > > fixedsamplelocations,
> > > > > GL_TRUE,
> > > > > @@ -5855,6 +5876,9 @@ _mesa_TextureStorage3DMultisample(GLuint
> > > > > texture,
> > > > > GLsizei samples,
> > > > > if (!texObj)
> > > > > return;
> > > > >
> > > > > + if (!valid_texstorage_ms_parameters(width, height, depth,
> > > > > samples, 3))
> > > > > + return;
> > > > > +
> > > > > _mesa_texture_image_multisample(ctx, 3, texObj, texObj
> > > > > ->Target, samples,
> > > > > internalformat, width,
> > > > > height, depth,
> > > > > fixedsamplelocations,
> > > > > GL_TRUE,
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