[Bug 89635] New: dEQP-GLES3: asin, acos, acosh do not have enough precision
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Mar 18 00:12:19 PDT 2015
https://bugs.freedesktop.org/show_bug.cgi?id=89635
Bug ID: 89635
Summary: dEQP-GLES3: asin, acos, acosh do not have enough
precision
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/i965
Assignee: idr at freedesktop.org
Reporter: itoral at igalia.com
QA Contact: intel-3d-bugs at lists.freedesktop.org
List of affected tests:
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_vertex.scalar
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_vertex.vec2
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_vertex.vec3
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_vertex.vec4
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_fragment.scalar
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_fragment.vec2
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_fragment.vec3
dEQP-GLES3.functional.shaders.builtin_functions.precision.asin.highp_fragment.vec4
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_vertex.scalar
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_vertex.vec2
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_vertex.vec3
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_vertex.vec4
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_fragment.scalar
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_fragment.vec2
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_fragment.vec3
dEQP-GLES3.functional.shaders.builtin_functions.precision.acos.highp_fragment.vec4
dEQP-GLES3.functional.shaders.builtin_functions.precision.acosh.highp_fragment.scalar
dEQP-GLES3.functional.shaders.builtin_functions.precision.acosh.highp_fragment.vec2
dEQP-GLES3.functional.shaders.builtin_functions.precision.acosh.highp_fragment.vec3
dEQP-GLES3.functional.shaders.builtin_functions.precision.acosh.highp_fragment.vec4
According to the GLES3 specs, trigonometric functions have undefined precision,
so I wonder if these tests are valid at all.
Since these are approximated using polynomials, in case we want to improve
precision, we could use higher order polynomials at the cost of some
performance. I have conducted some tests after a quick research and found some
polynomials that seemed to reduce significantly the number of tests failed (for
combined highp, mediump, lowp tests) but increased significantly the maximum
absolute error we obtained in some cases, so we probably want to find better
polynomials if we want to improve this.
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