diff --git a/example/gltf.ts b/example/gltf.ts
index c9c11c39..bb9212dd 100644
--- a/example/gltf.ts
+++ b/example/gltf.ts
@@ -12,22 +12,22 @@ import {
   Timeline
 } from 'claygl';
 
-const renderer = new Renderer({
-  canvas: document.getElementById('main') as HTMLCanvasElement
-});
-renderer.resize(window.innerWidth, window.innerHeight);
-const shadowMapPass = new ShadowMapPass();
-const environmentMap = new TextureCube({
-  width: 256,
-  height: 256
-});
-const environmentMapPass = new EnvironmentMapPass({
-  texture: environmentMap
-});
-const timeline = new Timeline();
-timeline.start();
-
 loadGLTFAsync('assets/models/basic_scene/scene.gltf').then((res) => {
+  const renderer = new Renderer({
+    canvas: document.getElementById('main') as HTMLCanvasElement
+  });
+  renderer.resize(window.innerWidth, window.innerHeight);
+  const shadowMapPass = new ShadowMapPass();
+  const environmentMap = new TextureCube({
+    width: 256,
+    height: 256
+  });
+  const environmentMapPass = new EnvironmentMapPass({
+    texture: environmentMap
+  });
+  const timeline = new Timeline();
+  timeline.start();
+
   const scene = res.scene!;
   scene.rotation.rotateX(-Math.PI / 2);
   const camera = new PerspectiveCamera({
diff --git a/src/FrameBuffer.ts b/src/FrameBuffer.ts
index dba28e3e..26b7e41f 100644
--- a/src/FrameBuffer.ts
+++ b/src/FrameBuffer.ts
@@ -130,7 +130,7 @@ class FrameBuffer {
     const attachedTextures = cache.get('attached_textures');
     if (attachedTextures) {
       for (const attachment in attachedTextures) {
-        if (!this._textures[attachment as unknown as GLEnum]) {
+        if (!textures[attachment as unknown as GLEnum]) {
           const target = attachedTextures[attachment];
           this._doDetach(_gl, attachment as unknown as GLEnum, target);
         }
@@ -252,6 +252,7 @@ class FrameBuffer {
 
     const boundRenderer = this._boundRenderer;
     const _gl = boundRenderer && boundRenderer.gl;
+    const textures = this._textures;
     let attachedTextures;
 
     if (_gl) {
@@ -261,7 +262,7 @@ class FrameBuffer {
     }
 
     // Check if texture attached
-    const previous = this._textures[attachment];
+    const previous = textures[attachment];
     if (
       previous &&
       previous.target === target &&
@@ -282,20 +283,21 @@ class FrameBuffer {
     }
 
     if (canAttach) {
-      this._textures[attachment] = this._textures[attachment] || ({} as any);
-      this._textures[attachment]!.texture = texture;
-      this._textures[attachment]!.target = target;
+      textures[attachment] = textures[attachment] || ({} as any);
+      textures[attachment]!.texture = texture;
+      textures[attachment]!.target = target;
     }
   }
 
   _doAttach(renderer: Renderer, texture: Texture, attachment: GLEnum, target: GLEnum): boolean {
     const _gl = renderer.gl;
+    const cache = this._cache;
     // Make sure texture is always updated
     // Because texture width or height may be changed and in this we can't be notified
     // FIXME awkward;
     const webglTexture = texture.getWebGLTexture(renderer);
     // Assume cache has been used.
-    let attachedTextures = this._cache.get('attached_textures');
+    let attachedTextures = cache.get('attached_textures');
     if (attachedTextures && attachedTextures[attachment]) {
       const obj = attachedTextures[attachment];
       // Check if texture and target not changed
@@ -321,15 +323,15 @@ class FrameBuffer {
 
       // Dispose render buffer created previous
       if (canAttach) {
-        const renderbuffer = this._cache.get(KEY_RENDERBUFFER);
+        const renderbuffer = cache.get(KEY_RENDERBUFFER);
         if (renderbuffer) {
           _gl.framebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, null);
           _gl.deleteRenderbuffer(renderbuffer);
-          this._cache.put(KEY_RENDERBUFFER, false);
+          cache.put(KEY_RENDERBUFFER, false);
         }
 
-        this._cache.put(KEY_RENDERBUFFER_ATTACHED, false);
-        this._cache.put(KEY_DEPTHTEXTURE_ATTACHED, true);
+        cache.put(KEY_RENDERBUFFER_ATTACHED, false);
+        cache.put(KEY_DEPTHTEXTURE_ATTACHED, true);
       }
     }
 
@@ -338,7 +340,7 @@ class FrameBuffer {
 
     if (!attachedTextures) {
       attachedTextures = {};
-      this._cache.put('attached_textures', attachedTextures);
+      cache.put('attached_textures', attachedTextures);
     }
     attachedTextures[attachment] = attachedTextures[attachment] || {};
     attachedTextures[attachment].texture = texture;
@@ -352,14 +354,15 @@ class FrameBuffer {
     // https://github.com/KhronosGroup/WebGL/blob/master/conformance-suites/1.0.0/conformance/framebuffer-test.html#L145
     _gl.framebufferTexture2D(GL_FRAMEBUFFER, attachment, target, null, 0);
 
+    const cache = this._cache;
     // Assume cache has been used.
-    const attachedTextures = this._cache.get('attached_textures');
+    const attachedTextures = cache.get('attached_textures');
     if (attachedTextures && attachedTextures[attachment]) {
       attachedTextures[attachment] = null;
     }
 
     if (attachment === GL_DEPTH_ATTACHMENT || attachment === glenum.DEPTH_STENCIL_ATTACHMENT) {
-      this._cache.put(KEY_DEPTHTEXTURE_ATTACHED, false);
+      cache.put(KEY_DEPTHTEXTURE_ATTACHED, false);
     }
   }
 
@@ -371,10 +374,11 @@ class FrameBuffer {
   detach(attachment: GLEnum, target: GLEnum) {
     // TODO depth extension check ?
     this._textures[attachment] = undefined;
-    if (this._boundRenderer) {
+    const boundRenderer = this._boundRenderer;
+    if (boundRenderer) {
       const cache = this._cache;
-      cache.use(this._boundRenderer.__uid__);
-      this._doDetach(this._boundRenderer.gl, attachment, target);
+      cache.use(boundRenderer.__uid__);
+      this._doDetach(boundRenderer.gl, attachment, target);
     }
   }
   /**
diff --git a/src/Texture2D.ts b/src/Texture2D.ts
index b74f41d9..6f0ff257 100644
--- a/src/Texture2D.ts
+++ b/src/Texture2D.ts
@@ -207,7 +207,7 @@ class Texture2D extends Texture {
         imgData = this._potCanvas;
       }
       gl.texImage2D(glenum.TEXTURE_2D, level, glFormat, glFormat, glType, imgData);
-    } else if (data.pixels) {
+    } else {
       // Can be used as a blank texture when writing render to texture(RTT)
       if (
         // S3TC
@@ -235,7 +235,7 @@ class Texture2D extends Texture {
           0,
           glFormat,
           glType,
-          data.pixels
+          data.pixels || null
         );
       }
     }
diff --git a/src/TextureCube.ts b/src/TextureCube.ts
index 5f48a13c..8cc6d03f 100644
--- a/src/TextureCube.ts
+++ b/src/TextureCube.ts
@@ -175,7 +175,7 @@ class TextureCube extends Texture {
           glType,
           img
         );
-      } else if (pixels) {
+      } else {
         _gl.texImage2D(
           glenum.TEXTURE_CUBE_MAP_POSITIVE_X + i,
           level,
@@ -185,7 +185,7 @@ class TextureCube extends Texture {
           0,
           glFormat,
           glType,
-          pixels
+          pixels || null
         );
       }
     }
diff --git a/src/gpu/GLProgram.ts b/src/gpu/GLProgram.ts
index 3b64d338..80adcc1d 100644
--- a/src/gpu/GLProgram.ts
+++ b/src/gpu/GLProgram.ts
@@ -71,7 +71,7 @@ class GLProgram {
   }
 
   hasUniform(symbol: string) {
-    const location = this._attrLocations[symbol];
+    const location = this._uniformLocations[symbol];
     return location !== null && location !== undefined;
   }
 
diff --git a/src/prePass/ShadowMap.ts b/src/prePass/ShadowMap.ts
index b305fe51..f70be359 100644
--- a/src/prePass/ShadowMap.ts
+++ b/src/prePass/ShadowMap.ts
@@ -638,7 +638,7 @@ class ShadowMapPass extends Notifier {
     let shadowMaterial = this._lightMaterials[light.__uid__];
     const isPointLight = light.type === 'POINT_LIGHT';
     if (!shadowMaterial) {
-      const shaderPrefix = isPointLight ? 'clay.sm.distance.' : 'clay.sm.depth.';
+      const shaderPrefix = 'clay.sm.' + (isPointLight ? 'distance.' : 'depth.');
       shadowMaterial = new Material({
         precision: this.precision,
         shader: new Shader(