testing cos and sin

erincatto · Aug 27, 2024 · 6f6f899 · 6f6f899
1 parent 073a663
commit 6f6f899
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Showing 2 changed files with 12 additions and 6 deletions.
diff --git a/samples/sample_determinism.cpp b/samples/sample_determinism.cpp
@@ -82,6 +82,10 @@ class FallingHinges : public Sample
 				bodyDef.type = b2_dynamicBody;
 
 				bodyDef.position = { x + offset * i, h + 2.0f * h * i };
+
+				// this tests the deterministic cosine and sine functions
+				bodyDef.rotation = b2MakeRot( 0.01f * i - 0.1f );
+
 				b2BodyId bodyId = b2CreateBody( m_worldId, &bodyDef );
 
 				if ((i & 1) == 0)

diff --git a/src/math_functions.c b/src/math_functions.c
@@ -60,12 +60,14 @@ bool b2Rot_IsValid( b2Rot q )
 
 float b2Sqrt(float x)
 {
-#if defined( B2_CPU_X64 ) || defined( B2_CPU_WASM )
-	return _mm_cvtss_f32(_mm_sqrt_ss( _mm_set1_ps(x) ));
-#else
-	float32x4_t v = vdupq_n_f32( x );
-	return vgetq_lane_f32( vsqrtq_f32( v ), 0 );
-#endif
+	return sqrtf( x );
+
+//#if defined( B2_CPU_X64 ) || defined( B2_CPU_WASM )
+//	return _mm_cvtss_f32(_mm_sqrt_ss( _mm_set1_ps(x) ));
+//#else
+//	float32x4_t v = vdupq_n_f32( x );
+//	return vgetq_lane_f32( vsqrtq_f32( v ), 0 );
+//#endif
 }
 
 float b2Length( b2Vec2 v )