diff --git a/src/renderer/gl_engine/tvgGlCommon.h b/src/renderer/gl_engine/tvgGlCommon.h
index 547d69ce..3de75e48 100644
--- a/src/renderer/gl_engine/tvgGlCommon.h
+++ b/src/renderer/gl_engine/tvgGlCommon.h
@@ -161,9 +161,7 @@ struct GlCompositor : RenderCompositor
     GlCompositor(const RenderRegion& box) : bbox(box) {}
 };
 
-#define GL_GAUSSIAN_MAX_LEVEL 3
 struct GlGaussianBlur {
-    int level{};
     float sigma{};
     float scale{};
     float extend{};
diff --git a/src/renderer/gl_engine/tvgGlRenderer.cpp b/src/renderer/gl_engine/tvgGlRenderer.cpp
index 3111277b..302f9001 100644
--- a/src/renderer/gl_engine/tvgGlRenderer.cpp
+++ b/src/renderer/gl_engine/tvgGlRenderer.cpp
@@ -953,7 +953,6 @@ void GlRenderer::effectGaussianBlurUpdate(RenderEffectGaussianBlur* effect, cons
     blur->sigma = effect->sigma;
     blur->scale = std::sqrt(transform.e11 * transform.e11 + transform.e12 * transform.e12);
     blur->extend = 2 * blur->sigma * blur->scale;
-    blur->level = int(GL_GAUSSIAN_MAX_LEVEL * ((effect->quality - 1) * 0.01f)) + 1;
     effect->rd = blur;
     effect->valid = true;
 }
@@ -972,7 +971,6 @@ void GlRenderer::effectDropShadowUpdate(RenderEffectDropShadow* effect, const Ma
     };
     dropShadow->sigma = sigma;
     dropShadow->scale = scale;
-    dropShadow->level = int(GL_GAUSSIAN_MAX_LEVEL * ((effect->quality - 1) * 0.01f)) + 1;
     dropShadow->color[3] = effect->color[3] / 255.0f;
     //Drop shadow effect applies blending in the shader (GL_BLEND disabled), so the color should be premultiplied:
     dropShadow->color[0] = effect->color[0] / 255.0f * dropShadow->color[3];
@@ -1189,8 +1187,8 @@ bool GlRenderer::render(TVG_UNUSED RenderCompositor* cmp, const RenderEffect* ef
         task->setDrawRange(ioffset, 6);
         // add task to render pipeline
         pass->addRenderTask(task);
-    }
-    return false;
+    } else return false;
+    return true;
 }
 
 
diff --git a/src/renderer/gl_engine/tvgGlShaderSrc.cpp b/src/renderer/gl_engine/tvgGlShaderSrc.cpp
index 73d5e8ae..f9eb8664 100644
--- a/src/renderer/gl_engine/tvgGlShaderSrc.cpp
+++ b/src/renderer/gl_engine/tvgGlShaderSrc.cpp
@@ -740,7 +740,6 @@ void main()
 const char* GAUSSIAN_VERTICAL = R"(
 uniform sampler2D uSrcTexture;
 layout(std140) uniform Gaussian {
-    int level;
     float sigma;
     float scale;
     float extend;
@@ -776,7 +775,6 @@ void main()
 const char* GAUSSIAN_HORIZONTAL = R"(
 uniform sampler2D uSrcTexture;
 layout(std140) uniform Gaussian {
-    int level;
     float sigma;
     float scale;
     float extend;
@@ -813,7 +811,6 @@ const char* EFFECT_DROPSHADOW = R"(
 uniform sampler2D uSrcTexture;
 uniform sampler2D uBlrTexture;
 layout(std140) uniform DropShadow {
-    int level;
     float sigma;
     float scale;
     float extend;