diff --git a/Source/OEShaderParamValue.h b/Source/OEShaderParamValue.h
index a7d5a8d..d766392 100644
--- a/Source/OEShaderParamValue.h
+++ b/Source/OEShaderParamValue.h
@@ -55,7 +55,6 @@ typedef NSArray<OEShaderParamValue *> *         OEShaderParamValues;
 @property (nonatomic, nonnull)  NSNumber  *step;
 @property (nonatomic)           BOOL      isInitial;
 
-+ (nonnull instancetype)groupWithName:(NSString *)name;
 + (OEShaderParamValues)withParameters:(NSArray<OEShaderParameter *> *)params;
 
 @end
diff --git a/Source/OEShaderParamValue.m b/Source/OEShaderParamValue.m
index 7502ed1..b87b8cc 100644
--- a/Source/OEShaderParamValue.m
+++ b/Source/OEShaderParamValue.m
@@ -37,7 +37,7 @@
     p.groupIndex = groupIndex;
     p.name       = param.name;
     p.desc       = param.desc;
-    p.value      = @(param.value);
+    p.value      = @(param.initial);
     p.initial    = @(param.initial);
     p.minimum    = @(param.minimum);
     p.maximum    = @(param.maximum);
@@ -46,14 +46,6 @@
     return p;
 }
 
-+ (nonnull instancetype)groupWithName:(NSString *)name
-{
-    OEShaderParamValue *p = [OEShaderParamValue new];
-    p.index = -1; // "group"
-    p.group = name;
-    return p;
-}
-
 + (NSArray<OEShaderParamValue *> *)withParameters:(NSArray<OEShaderParameter *> *)params
 {
     __block NSMutableArray<OEShaderParamValue *> *res = [[NSMutableArray alloc] initWithCapacity:params.count];
diff --git a/Source/OpenEmuHelperApp.m b/Source/OpenEmuHelperApp.m
index d48a314..670140f 100644
--- a/Source/OpenEmuHelperApp.m
+++ b/Source/OpenEmuHelperApp.m
@@ -147,7 +147,6 @@ static os_log_t LOG_DISPLAY;
     _commandQueue      = [_device newCommandQueue];
     _clearColor        = MTLClearColorMake(0, 0, 0, 1);
     _filterChain       = [[OEFilterChain alloc] initWithDevice:_device];
-    [_filterChain setDefaultFilteringLinear:NO];
     
     [self updateScreenSize];
     [self updateGameRenderer];
@@ -289,14 +288,19 @@ static os_log_t LOG_DISPLAY;
     }];
 }
 
+- (ShaderCompilerOptions *)makeOptions
+{
+    return [ShaderCompilerOptions makeOptions];
+}
+
 - (BOOL)setShaderURL:(NSURL *)url parameters:(NSDictionary<NSString *, NSNumber *> *)parameters error:(NSError **)error
 {
-    BOOL success = [_filterChain setShaderFromURL:url error:error];
+    BOOL success = [_filterChain setShaderFromURL:url options:[self makeOptions] error:error];
     if (success)
     {
-        __block __auto_type shader = _filterChain.shader;
+        __block __auto_type filter = _filterChain;
         [parameters enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSNumber *obj, BOOL *stop) {
-            [shader setValue:obj.doubleValue forParameter:key];
+            [filter setValue:obj.doubleValue forParameterName:key];
         }];
     }
     
@@ -305,7 +309,7 @@ static os_log_t LOG_DISPLAY;
 
 - (void)setShaderParameterValue:(CGFloat)value forKey:(NSString *)key
 {
-    [_filterChain.shader setValue:value forParameter:key];
+    [_filterChain setValue:value forParameterName:key];
 }
 
 #pragma mark - Game Core methods