Merge pull request #2544 from ZhiqianXia/master

Replace log2 and exp2 math func.

Merge pull request #2544 from ZhiqianXia/master
51d672b8 · greg-lunarg · GitHub · 00c6d2d4 · 47a21828 · 51d672b8
Unverified Commit 51d672b8 authored Feb 25, 2021 by greg-lunarg Committed by GitHub Feb 25, 2021
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Constant.cpp glslang/MachineIndependent/Constant.cpp +4 -10

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--- a/glslang/MachineIndependent/Constant.cpp
+++ b/glslang/MachineIndependent/Constant.cpp
@@ -599,17 +599,11 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TType& returnType) 
            newConstArray[i].setDConst(log(unionArray[i].getDConst()));
            break;
        case EOpExp2:
-            {
-                const double inv_log2_e = 0.69314718055994530941723212145818;
-                newConstArray[i].setDConst(exp(unionArray[i].getDConst() * inv_log2_e));
-                break;
-            }
+            newConstArray[i].setDConst(exp2(unionArray[i].getDConst()));
+            break;
        case EOpLog2:
-            {
-                const double log2_e = 1.4426950408889634073599246810019;
-                newConstArray[i].setDConst(log2_e * log(unionArray[i].getDConst()));
-                break;
-            }
+            newConstArray[i].setDConst(log2(unionArray[i].getDConst()));
+            break;
        case EOpSqrt:
            newConstArray[i].setDConst(sqrt(unionArray[i].getDConst()));
            break;