diff options
| author | Brian Paul <[email protected]> | 2009-06-03 15:42:52 -0600 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2009-06-03 17:16:00 -0600 |
| commit | 035de6a82b6c911a81ca9c678aac59772eaff8d3 (patch) | |
| tree | 4cb57a867a4380bec980ecbea2e50429aad6b103 | |
| parent | 87b2db988e25506ecf476386a8b9792d459a2fde (diff) | |
mesa: check/prevent NaN for EX2/LG2
| -rw-r--r-- | src/mesa/shader/prog_execute.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/src/mesa/shader/prog_execute.c b/src/mesa/shader/prog_execute.c index 68a59350a13..2b7237ef312 100644 --- a/src/mesa/shader/prog_execute.c +++ b/src/mesa/shader/prog_execute.c @@ -832,10 +832,14 @@ _mesa_execute_program(GLcontext * ctx, break; case OPCODE_EX2: /* Exponential base 2 */ { - GLfloat a[4], result[4]; + GLfloat a[4], result[4], val; fetch_vector1(&inst->SrcReg[0], machine, a); - result[0] = result[1] = result[2] = result[3] = - (GLfloat) _mesa_pow(2.0, a[0]); + val = (GLfloat) _mesa_pow(2.0, a[0]); + /* + if (IS_INF_OR_NAN(val)) + val = 1.0e10; + */ + result[0] = result[1] = result[2] = result[3] = val; store_vector4(inst, machine, result); } break; @@ -911,12 +915,17 @@ _mesa_execute_program(GLcontext * ctx, break; case OPCODE_LG2: /* log base 2 */ { - GLfloat a[4], result[4]; + GLfloat a[4], result[4], val; fetch_vector1(&inst->SrcReg[0], machine, a); /* The fast LOG2 macro doesn't meet the precision requirements. */ - result[0] = result[1] = result[2] = result[3] = - (log(a[0]) * 1.442695F); + if (a[0] == 0.0F) { + val = 0.0F; + } + else { + val = log(a[0]) * 1.442695F; + } + result[0] = result[1] = result[2] = result[3] = val; store_vector4(inst, machine, result); } break; |