diff --git a/src/renderer/gl_engine/tvgGlCommon.h b/src/renderer/gl_engine/tvgGlCommon.h
index 3de75e48..547d69ce 100644
--- a/src/renderer/gl_engine/tvgGlCommon.h
+++ b/src/renderer/gl_engine/tvgGlCommon.h
@@ -161,7 +161,9 @@ 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 a821acdc..5f72f1e9 100644
--- a/src/renderer/gl_engine/tvgGlRenderer.cpp
+++ b/src/renderer/gl_engine/tvgGlRenderer.cpp
@@ -953,6 +953,7 @@ 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 = (blur->extend > 0);
 }
@@ -971,6 +972,7 @@ 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];
@@ -1186,8 +1188,8 @@ bool GlRenderer::render(TVG_UNUSED RenderCompositor* cmp, const RenderEffect* ef
         task->setDrawRange(ioffset, 6);
         // add task to render pipeline
         pass->addRenderTask(task);
-    } else return false;
-    return true;
+    }
+    return false;
 }
 
 
diff --git a/src/renderer/gl_engine/tvgGlShaderSrc.cpp b/src/renderer/gl_engine/tvgGlShaderSrc.cpp
index 0cdb004d..fe4dc1e9 100644
--- a/src/renderer/gl_engine/tvgGlShaderSrc.cpp
+++ b/src/renderer/gl_engine/tvgGlShaderSrc.cpp
@@ -740,6 +740,7 @@ void main()
 const char* GAUSSIAN_VERTICAL = R"(
 uniform sampler2D uSrcTexture;
 layout(std140) uniform Gaussian {
+    int level;
     float sigma;
     float scale;
     float extend;
@@ -775,6 +776,7 @@ void main()
 const char* GAUSSIAN_HORIZONTAL = R"(
 uniform sampler2D uSrcTexture;
 layout(std140) uniform Gaussian {
+    int level;
     float sigma;
     float scale;
     float extend;
@@ -811,6 +813,7 @@ const char* EFFECT_DROPSHADOW = R"(
 uniform sampler2D uSrcTexture;
 uniform sampler2D uBlrTexture;
 layout(std140) uniform DropShadow {
+    int level;
     float sigma;
     float scale;
     float extend;