diff options
| author | Francisco Jerez <[email protected]> | 2016-03-02 23:50:04 -0800 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2016-03-03 21:31:22 -0800 |
| commit | a6046d217d14130a46f6ffe42992fd745551a928 (patch) | |
| tree | 0c58db5ec1f9bfd2c99ebc10e27afb9ec6537f5e /src/compiler | |
| parent | 2795fbcae302cd8821b23821ebf8a2b256ff10d5 (diff) | |
glsl: Improve the accuracy of the acos() approximation.
The adjusted polynomial coefficients come from the numerical
minimization of the L2 norm of the relative error. The old
coefficients would give a maximum relative error of about 15000 ULP in
the neighborhood around acos(x) = 0, the new ones give a relative
error bounded by less than 2000 ULP in the same neighborhood.
Fixes four dEQP subtests:
dEQP-GLES31.functional.shaders.builtin_functions.precision.acos.
highp_compute.{scalar,vec2,vec3,vec4}
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Iago Toral Quiroga <[email protected]>
Reviewed-by: Francisco Jerez <[email protected]>
Diffstat (limited to 'src/compiler')
| -rw-r--r-- | src/compiler/glsl/builtin_functions.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/compiler/glsl/builtin_functions.cpp b/src/compiler/glsl/builtin_functions.cpp index 0d289c1615c..10fb21b9a0d 100644 --- a/src/compiler/glsl/builtin_functions.cpp +++ b/src/compiler/glsl/builtin_functions.cpp @@ -3262,7 +3262,7 @@ builtin_builder::_acos(const glsl_type *type) ir_variable *x = in_var(type, "x"); MAKE_SIG(type, always_available, 1, x); - body.emit(ret(sub(imm(M_PI_2f), asin_expr(x, 0.086566724f, -0.03102955f)))); + body.emit(ret(sub(imm(M_PI_2f), asin_expr(x, 0.08132463f, -0.02363318f)))); return sig; } |