diff options
| author | Brian Paul <brianp@vmware.com> | 2010-08-31 19:13:09 -0600 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2010-08-31 19:15:07 -0600 |
| commit | 16c733495d74d8c2443aa915a55df97c02b415c7 (patch) | |
| tree | 4917991d2a6398cffe82d232c13c085f0bec9650 /src/glsl | |
| parent | 9b075cb9fa9eb6a95d0816283ef01ae72dafa680 (diff) | |
glsl2: fix bug in atan(y, x) function
When x==0, the result was wrong. Fixes piglit glsl-fs-atan-1.shader_test
Diffstat (limited to 'src/glsl')
| -rw-r--r-- | src/glsl/builtin_function.cpp | 12 | ||||
| -rw-r--r-- | src/glsl/builtins/ir/atan | 10 |
2 files changed, 9 insertions, 13 deletions
diff --git a/src/glsl/builtin_function.cpp b/src/glsl/builtin_function.cpp index d3484cbcd3..e6feb55759 100644 --- a/src/glsl/builtin_function.cpp +++ b/src/glsl/builtin_function.cpp @@ -324,6 +324,8 @@ static const char *builtin_atan = ") \n" " (assign (constant bool (1)) (var_ref r) (var_ref atan_retval) ) \n" " (if (expression bool < (var_ref x) (constant float (0.000000)) ) (\n" + "\n" + "\n" " (if (expression bool >= (var_ref y) (constant float (0.000000)) ) (\n" " (declare ( ) float assignment_tmp)\n" " (assign (constant bool (1)) (var_ref assignment_tmp) (expression float + (var_ref r) (constant float (3.141593)) ) ) \n" @@ -341,12 +343,10 @@ static const char *builtin_atan = "\n" " )\n" " (\n" - " (if (expression bool >= (var_ref y) (constant float (0.000000)) ) (\n" - " (assign (constant bool (1)) (var_ref r) (constant float (1.570796)) ) \n" - " )\n" - " (\n" - " (assign (constant bool (1)) (var_ref r) (constant float (-1.570796)) ) \n" - " ))\n" + "\n" + " (declare () float sgn)\n" + " (assign (constant bool (1)) (var_ref sgn) (expression float sign (var_ref y)))\n" + " (assign (constant bool (1)) (var_ref r) (expression float * (var_ref sgn) (constant float (1.5707965))))\n" "\n" " ))\n" "\n" diff --git a/src/glsl/builtins/ir/atan b/src/glsl/builtins/ir/atan index 8404829387..04e1898f9f 100644 --- a/src/glsl/builtins/ir/atan +++ b/src/glsl/builtins/ir/atan @@ -80,13 +80,9 @@ ) ( - (if (expression bool >= (var_ref y) (constant float (0.000000)) ) ( - (assign (constant bool (1)) (var_ref r) (constant float (1.570796)) ) - ) - ( - (assign (constant bool (1)) (var_ref r) (constant float (-1.570796)) ) - )) - + (declare () float sgn) + (assign (constant bool (1)) (var_ref sgn) (expression float sign (var_ref y))) + (assign (constant bool (1)) (var_ref r) (expression float * (var_ref sgn) (constant float (1.5707965)))) )) (return (var_ref r) ) |