Re: [Mesa-dev] [PATCH] glsl: Allow precision mismatch on dead uniform with GLSL ES 1.00 (v3)
Hi Kenneth, On Tue, Nov 7, 2017 at 8:18 AM, Kenneth Graunkewrote: > On Thursday, October 19, 2017 9:02:20 PM PST Tomasz Figa wrote: >> Hi Ian, Kenneth, >> >> On Wed, Sep 27, 2017 at 2:57 AM, Tomasz Figa wrote: >> > Commit 259fc505454ea6a67aeacf6cdebf1398d9947759 added linker error for >> > mismatching uniform precision, as required by GLES 3.0 specification and >> > conformance test-suite. >> > >> > Several Android applications, including Forge of Empires, have shaders >> > which violate this rule, on uniforms that are declared but not used >> > further in shader code. The problem affects a big number of Android >> > games, including ones built on top of one of the common 2D graphics >> > engines and other GLES implementations accept this, which poses a serious >> > application compatibility issue. >> > >> > Starting from GLSL ES 3.0, declarations with conflicting precision >> > qualifiers are explicitly prohibited. However GLSL ES 1.00 does not >> > clearly specify the behavior, except that >> > >> > "Uniforms are defined to behave as if they are using the same storage in >> > the vertex and fragment processors and may be implemented this way. >> > If uniforms are used in both the vertex and fragment shaders, developers >> > should be warned if the precisions are different. Conversion of >> > precision should never be implicit." >> > >> > The word "used" is not clear in this context and might refer to >> > 1) declared (same as GLES 3.x) >> > 2) referred after post-processing, or >> > 3) linked after all optimizations are done. >> > >> > Looking at existing applications, 2) or 3) seems to be widely adopted. >> > To avoid compatibility issues, turn the error into a warning if GLSL ES >> > version is lower than 3.0 and the data is dead in at least one of the >> > shaders. >> > >> > v3: >> > - Add a comment explaining the behavior. >> > - Fix bad copy/paste in commit message (s/varyings/uniforms). >> >> Would you be able to take a look? >> >> Ian, I believe your previous NAK was due to the confusing erroneous >> copy/paste from the freedesktop bug I made in commit message. Looking >> at last comment from Kenneth there, we were going to go with my patch, >> but things remained quiet after that. >> >> Thanks, >> Tomasz > > Sorry, this completely fell off my radar. I've gone ahead and pushed > your patch. Dylan also sent out Piglit tests for this case today, which > I've reviewed. No worries, thanks a lot! Best regards, Tomasz ___ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
Re: [Mesa-dev] [PATCH] glsl: Allow precision mismatch on dead uniform with GLSL ES 1.00 (v3)
On Thursday, October 19, 2017 9:02:20 PM PST Tomasz Figa wrote: > Hi Ian, Kenneth, > > On Wed, Sep 27, 2017 at 2:57 AM, Tomasz Figawrote: > > Commit 259fc505454ea6a67aeacf6cdebf1398d9947759 added linker error for > > mismatching uniform precision, as required by GLES 3.0 specification and > > conformance test-suite. > > > > Several Android applications, including Forge of Empires, have shaders > > which violate this rule, on uniforms that are declared but not used > > further in shader code. The problem affects a big number of Android > > games, including ones built on top of one of the common 2D graphics > > engines and other GLES implementations accept this, which poses a serious > > application compatibility issue. > > > > Starting from GLSL ES 3.0, declarations with conflicting precision > > qualifiers are explicitly prohibited. However GLSL ES 1.00 does not > > clearly specify the behavior, except that > > > > "Uniforms are defined to behave as if they are using the same storage in > > the vertex and fragment processors and may be implemented this way. > > If uniforms are used in both the vertex and fragment shaders, developers > > should be warned if the precisions are different. Conversion of > > precision should never be implicit." > > > > The word "used" is not clear in this context and might refer to > > 1) declared (same as GLES 3.x) > > 2) referred after post-processing, or > > 3) linked after all optimizations are done. > > > > Looking at existing applications, 2) or 3) seems to be widely adopted. > > To avoid compatibility issues, turn the error into a warning if GLSL ES > > version is lower than 3.0 and the data is dead in at least one of the > > shaders. > > > > v3: > > - Add a comment explaining the behavior. > > - Fix bad copy/paste in commit message (s/varyings/uniforms). > > Would you be able to take a look? > > Ian, I believe your previous NAK was due to the confusing erroneous > copy/paste from the freedesktop bug I made in commit message. Looking > at last comment from Kenneth there, we were going to go with my patch, > but things remained quiet after that. > > Thanks, > Tomasz Sorry, this completely fell off my radar. I've gone ahead and pushed your patch. Dylan also sent out Piglit tests for this case today, which I've reviewed. --Ken signature.asc Description: This is a digitally signed message part. ___ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
Re: [Mesa-dev] [PATCH] glsl: Allow precision mismatch on dead uniform with GLSL ES 1.00 (v3)
Hi Ian, Kenneth, On Wed, Sep 27, 2017 at 2:57 AM, Tomasz Figawrote: > Commit 259fc505454ea6a67aeacf6cdebf1398d9947759 added linker error for > mismatching uniform precision, as required by GLES 3.0 specification and > conformance test-suite. > > Several Android applications, including Forge of Empires, have shaders > which violate this rule, on uniforms that are declared but not used > further in shader code. The problem affects a big number of Android > games, including ones built on top of one of the common 2D graphics > engines and other GLES implementations accept this, which poses a serious > application compatibility issue. > > Starting from GLSL ES 3.0, declarations with conflicting precision > qualifiers are explicitly prohibited. However GLSL ES 1.00 does not > clearly specify the behavior, except that > > "Uniforms are defined to behave as if they are using the same storage in > the vertex and fragment processors and may be implemented this way. > If uniforms are used in both the vertex and fragment shaders, developers > should be warned if the precisions are different. Conversion of > precision should never be implicit." > > The word "used" is not clear in this context and might refer to > 1) declared (same as GLES 3.x) > 2) referred after post-processing, or > 3) linked after all optimizations are done. > > Looking at existing applications, 2) or 3) seems to be widely adopted. > To avoid compatibility issues, turn the error into a warning if GLSL ES > version is lower than 3.0 and the data is dead in at least one of the > shaders. > > v3: > - Add a comment explaining the behavior. > - Fix bad copy/paste in commit message (s/varyings/uniforms). Would you be able to take a look? Ian, I believe your previous NAK was due to the confusing erroneous copy/paste from the freedesktop bug I made in commit message. Looking at last comment from Kenneth there, we were going to go with my patch, but things remained quiet after that. Thanks, Tomasz > v2: > - Change the behavior only for GLSL ES 1.00 shaders. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97532 > Signed-off-by: Tomasz Figa > --- > src/compiler/glsl/linker.cpp | 32 > 1 file changed, 28 insertions(+), 4 deletions(-) > > diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp > index f352c5385ca..693c5ae3664 100644 > --- a/src/compiler/glsl/linker.cpp > +++ b/src/compiler/glsl/linker.cpp > @@ -1121,10 +1121,34 @@ cross_validate_globals(struct gl_shader_program *prog, > if (prog->IsES && (prog->data->Version != 310 || > !var->get_interface_type()) && > existing->data.precision != var->data.precision) { > -linker_error(prog, "declarations for %s `%s` have " > - "mismatching precision qualifiers\n", > - mode_string(var), var->name); > -return; > +/* > + * GLSL ES 3.00 is the first version that explicitly requires > + * that uniform declarations have matching precision qualifiers. > + * > + * The only relevant part of GLSL ES 1.00 spec, > + * > + * "If uniforms are used in both the vertex and fragment > shaders, > + * developers should be warned if the precisions are different. > + * Conversion of precision should never be implicit." > + * > + * leaves too wide field for intepretation. However, judging by > + * applications and implementations existing in the wild, it > seems > + * to be widely assumed that declarations alone are not enough to > + * fail the link. > + * > + * Thus, in case of GLSL ES < 3.00, trigger an error only if the > + * uniform is actually referenced in the code of both shaders. > + */ > +if ((existing->data.used && var->data.used) || > prog->data->Version >= 300) { > + linker_error(prog, "declarations for %s `%s` have " > +"mismatching precision qualifiers\n", > +mode_string(var), var->name); > + return; > +} else { > + linker_warning(prog, "declarations for %s `%s` have " > + "mismatching precision qualifiers\n", > + mode_string(var), var->name); > +} > } >} else > variables->add_variable(var); > -- > 2.14.1.992.g2c7b836f3a-goog > ___ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
[Mesa-dev] [PATCH] glsl: Allow precision mismatch on dead uniform with GLSL ES 1.00 (v3)
Commit 259fc505454ea6a67aeacf6cdebf1398d9947759 added linker error for mismatching uniform precision, as required by GLES 3.0 specification and conformance test-suite. Several Android applications, including Forge of Empires, have shaders which violate this rule, on uniforms that are declared but not used further in shader code. The problem affects a big number of Android games, including ones built on top of one of the common 2D graphics engines and other GLES implementations accept this, which poses a serious application compatibility issue. Starting from GLSL ES 3.0, declarations with conflicting precision qualifiers are explicitly prohibited. However GLSL ES 1.00 does not clearly specify the behavior, except that "Uniforms are defined to behave as if they are using the same storage in the vertex and fragment processors and may be implemented this way. If uniforms are used in both the vertex and fragment shaders, developers should be warned if the precisions are different. Conversion of precision should never be implicit." The word "used" is not clear in this context and might refer to 1) declared (same as GLES 3.x) 2) referred after post-processing, or 3) linked after all optimizations are done. Looking at existing applications, 2) or 3) seems to be widely adopted. To avoid compatibility issues, turn the error into a warning if GLSL ES version is lower than 3.0 and the data is dead in at least one of the shaders. v3: - Add a comment explaining the behavior. - Fix bad copy/paste in commit message (s/varyings/uniforms). v2: - Change the behavior only for GLSL ES 1.00 shaders. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97532 Signed-off-by: Tomasz Figa--- src/compiler/glsl/linker.cpp | 32 1 file changed, 28 insertions(+), 4 deletions(-) diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp index f352c5385ca..693c5ae3664 100644 --- a/src/compiler/glsl/linker.cpp +++ b/src/compiler/glsl/linker.cpp @@ -1121,10 +1121,34 @@ cross_validate_globals(struct gl_shader_program *prog, if (prog->IsES && (prog->data->Version != 310 || !var->get_interface_type()) && existing->data.precision != var->data.precision) { -linker_error(prog, "declarations for %s `%s` have " - "mismatching precision qualifiers\n", - mode_string(var), var->name); -return; +/* + * GLSL ES 3.00 is the first version that explicitly requires + * that uniform declarations have matching precision qualifiers. + * + * The only relevant part of GLSL ES 1.00 spec, + * + * "If uniforms are used in both the vertex and fragment shaders, + * developers should be warned if the precisions are different. + * Conversion of precision should never be implicit." + * + * leaves too wide field for intepretation. However, judging by + * applications and implementations existing in the wild, it seems + * to be widely assumed that declarations alone are not enough to + * fail the link. + * + * Thus, in case of GLSL ES < 3.00, trigger an error only if the + * uniform is actually referenced in the code of both shaders. + */ +if ((existing->data.used && var->data.used) || prog->data->Version >= 300) { + linker_error(prog, "declarations for %s `%s` have " +"mismatching precision qualifiers\n", +mode_string(var), var->name); + return; +} else { + linker_warning(prog, "declarations for %s `%s` have " + "mismatching precision qualifiers\n", + mode_string(var), var->name); +} } } else variables->add_variable(var); -- 2.14.1.992.g2c7b836f3a-goog ___ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev