glsl: Fix pi/2 constant in acos built-in function

In single precision, 1.5707963 becomes 1.5707962513 which is too
small.  However, 1.5707964 becomes 1.5707963705 which is just right.
The value 1.5707964 is already used in asin.ir.

NOTE: This is a candidate for stable release branches.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Olivier Galibert <[email protected]>
Reviewed-by: Paul Berry <[email protected]>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/glsl/builtins/ir/acos.ir b/src/glsl/builtins/ir/acos.ir
index f0078f884e7..8c3797e9677 100644
--- a/src/glsl/builtins/ir/acos.ir
+++ b/src/glsl/builtins/ir/acos.ir
@@ -4,26 +4,26 @@
        (declare (in) float x))
      ((declare () float s)
       (call asin (var_ref s) ((var_ref x)))
-      (return (expression float - (constant float (1.5707963)) (var_ref s)))))
+      (return (expression float - (constant float (1.5707964)) (var_ref s)))))
 
    (signature vec2
      (parameters
        (declare (in) vec2 x))
      ((declare () vec2 s)
       (call asin (var_ref s) ((var_ref x)))
-      (return (expression vec2 - (constant float (1.5707963)) (var_ref s)))))
+      (return (expression vec2 - (constant float (1.5707964)) (var_ref s)))))
 
    (signature vec3
      (parameters
        (declare (in) vec3 x))
      ((declare () vec3 s)
       (call asin (var_ref s) ((var_ref x)))
-      (return (expression vec3 - (constant float (1.5707963)) (var_ref s)))))
+      (return (expression vec3 - (constant float (1.5707964)) (var_ref s)))))
 
    (signature vec4
      (parameters
        (declare (in) vec4 x))
      ((declare () vec4 s)
       (call asin (var_ref s) ((var_ref x)))
-      (return (expression vec4 - (constant float (1.5707963)) (var_ref s)))))
+      (return (expression vec4 - (constant float (1.5707964)) (var_ref s)))))
 ))