Remove workaround for Adreno bug (#24390)

src/renderers/shaders/ShaderChunk/bumpmap_pars_fragment.glsl.js

@@ -24,11 +24,9 @@ export default /* glsl */`
 
 	vec3 perturbNormalArb( vec3 surf_pos, vec3 surf_norm, vec2 dHdxy, float faceDirection ) {
 
-		// Workaround for Adreno 3XX dFd*( vec3 ) bug. See #9988
-
-		vec3 vSigmaX = vec3( dFdx( surf_pos.x ), dFdx( surf_pos.y ), dFdx( surf_pos.z ) );
-		vec3 vSigmaY = vec3( dFdy( surf_pos.x ), dFdy( surf_pos.y ), dFdy( surf_pos.z ) );
-		vec3 vN = surf_norm;		// normalized
+		vec3 vSigmaX = dFdx( surf_pos.xyz );
+		vec3 vSigmaY = dFdy( surf_pos.xyz );
+		vec3 vN = surf_norm; // normalized
 
 		vec3 R1 = cross( vSigmaY, vN );
 		vec3 R2 = cross( vN, vSigmaX );

src/renderers/shaders/ShaderChunk/normalmap_pars_fragment.glsl.js

@@ -19,10 +19,8 @@ export default /* glsl */`
 
 	vec3 perturbNormal2Arb( vec3 eye_pos, vec3 surf_norm, vec3 mapN, float faceDirection ) {
 
-		// Workaround for Adreno 3XX dFd*( vec3 ) bug. See #9988
-
-		vec3 q0 = vec3( dFdx( eye_pos.x ), dFdx( eye_pos.y ), dFdx( eye_pos.z ) );
-		vec3 q1 = vec3( dFdy( eye_pos.x ), dFdy( eye_pos.y ), dFdy( eye_pos.z ) );
+		vec3 q0 = dFdx( eye_pos.xyz );
+		vec3 q1 = dFdy( eye_pos.xyz );
 		vec2 st0 = dFdx( vUv.st );
 		vec2 st1 = dFdy( vUv.st );