diff --git a/assets/effects/sprite-round-corner-crop.effect b/assets/effects/sprite-round-corner-crop.effect
index 672793d..e894a2a 100644
--- a/assets/effects/sprite-round-corner-crop.effect
+++ b/assets/effects/sprite-round-corner-crop.effect
@@ -96,13 +96,47 @@ CCProgram fs %{
     ALPHA_TEST(o);
 
     #if ENABLE_ROUNDCORNER
+    // 约束圆角半径范围在 [0.0, 0.5]
+    float radius = clamp(0.0, 0.5, roundCornerRadius);
+
+    // 将纹理uv往左下偏移，实现偏移后的纹理中心点在 OpenGL 坐标系的原点
     vec2 uv = v_uv0.xy - vec2(0.5, 0.5);
-    float rx = abs(uv.x) - (0.5 - roundCornerRadius);
-    float ry = abs(uv.y) - (0.5 - roundCornerRadius);
-    float mx = step(0.5 - roundCornerRadius, abs(uv.x));
-    float my = step(0.5 - roundCornerRadius, abs(uv.y));
-    float radius = length(vec2(rx, ry));
-    float a = 1.0 - mx * my * step(roundCornerRadius, radius) * smoothstep(0., roundCornerRadius * 0.01, radius - roundCornerRadius);
+
+    // uv.x , uv.y :              为偏移后的的uv
+    // abs(uv.x) , abs(uv.y) :    将第二、三、四象限的点都投影到第一象限上，这样子只需要处理第一象限的情况就可以，简化判断
+    // 0.5 - radius :             计算出第一象限的圆角所在圆的圆心坐标
+    // (rx, ry) :                 偏移映射后的 新的uv 坐标，相对于 第一象限圆角坐在圆心坐标 的相对坐标
+    float rx = abs(uv.x) - (0.5 - radius);
+    float ry = abs(uv.y) - (0.5 - radius);
+
+    // 区分 以第一象限圆角所在圆心坐标为原点的坐标的四个象限
+    //
+    // 第一象限 mx = 1, my = 1
+    // 第二象限 mx = 0, my = 1
+    // 第三象限 mx = 0, my = 0
+    // 第四象限 mx = 1, my = 0
+    // 
+    // 当 mx * my 时，只要等于1，那就是标识第一象限（实际对应圆角区域所在矩形），否则就是第二、三、四象限
+    float mx = step(0.5 - radius, abs(uv.x));
+    float my = step(0.5 - radius, abs(uv.y));
+
+    // 计算相对uv坐标到圆心的距离
+    float len = length(vec2(rx, ry));
+
+    // mx * my = 0 时，代表非圆角区域，a 值为1，代表完全采用原始纹理的透明度
+    // mx * my = 1 时，代表园所所在矩形区域
+    //  step(radius, len) 可以区分出圆角所在矩形区域的 圆角区域 和 非圆角区域
+    //    其中圆角区域值为0，非圆角区域值为1
+    //      当为圆角区域时，a 值为1，代表完全采用原始纹理透明度
+    //      当为非圆角区域时，a 值为0，代表完全透明
+    //    至此已经实现圆角裁剪
+    //  
+    //  smoothstep(0., radius * 0.01, len - radius) 是用于抗锯齿优化
+    //    原理：针对点在非圆角区域的情况，针对点在大于「圆半径一点点」地方的区域，进行平滑过渡，以实现抗锯齿
+    //    其中，
+    //      「圆半径一点点」用  radius * 0.01 表示（0.01 可自行改变）
+    //      点在大于圆半径的区域用 len - radius ，此值会在 [0.0, radius * 0.01] 之间时会平滑过渡
+    float a = 1.0 - mx * my * step(radius, len) * smoothstep(0., radius * 0.01, len - radius);
     o = vec4(o.rgb, o.a * a);
     #endif
     gl_FragColor = o;
diff --git a/assets/effects/sprite-round-corner-crop.effect.meta b/assets/effects/sprite-round-corner-crop.effect.meta
index eb8a892..4f9bb47 100644
--- a/assets/effects/sprite-round-corner-crop.effect.meta
+++ b/assets/effects/sprite-round-corner-crop.effect.meta
@@ -5,11 +5,11 @@
     {
       "glsl1": {
         "vert": "\nprecision highp float;\nuniform mat4 cc_matViewProj;\nuniform mat4 cc_matWorld;\n\nattribute vec3 a_position;\nattribute vec4 a_color;\nvarying vec4 v_color;\n\n#if USE_TEXTURE\nattribute vec2 a_uv0;\nvarying vec2 v_uv0;\n#endif\n\nvoid main () {\n  vec4 pos = vec4(a_position, 1);\n\n  #if CC_USE_MODEL\n  pos = cc_matViewProj * cc_matWorld * pos;\n  #else\n  pos = cc_matViewProj * pos;\n  #endif\n\n  #if USE_TEXTURE\n  v_uv0 = a_uv0;\n  #endif\n\n  v_color = a_color;\n\n  gl_Position = pos;\n}\n",
-        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform float alphaThreshold;\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nvarying vec4 v_color;\n\n#if USE_TEXTURE\nvarying vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if ENABLE_ROUNDCORNER\nuniform float roundCornerRadius;\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture2D(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if ENABLE_ROUNDCORNER\n  vec2 uv = v_uv0.xy - vec2(0.5, 0.5);\n  float rx = abs(uv.x) - (0.5 - roundCornerRadius);\n  float ry = abs(uv.y) - (0.5 - roundCornerRadius);\n  float mx = step(0.5 - roundCornerRadius, abs(uv.x));\n  float my = step(0.5 - roundCornerRadius, abs(uv.y));\n  float radius = length(vec2(rx, ry));\n  float a = 1.0 - mx * my * step(roundCornerRadius, radius) * smoothstep(0., roundCornerRadius * 0.01, radius - roundCornerRadius);\n  o = vec4(o.rgb, o.a * a);\n  #endif\n  gl_FragColor = o;\n}\n"
+        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform float alphaThreshold;\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nvarying vec4 v_color;\n\n#if USE_TEXTURE\nvarying vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if ENABLE_ROUNDCORNER\nuniform float roundCornerRadius;\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture2D(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if ENABLE_ROUNDCORNER\n\n  float radius = clamp(0.0, 0.5, roundCornerRadius);\n\n  vec2 uv = v_uv0.xy - vec2(0.5, 0.5);\n\n  float rx = abs(uv.x) - (0.5 - radius);\n  float ry = abs(uv.y) - (0.5 - radius);\n\n  float mx = step(0.5 - radius, abs(uv.x));\n  float my = step(0.5 - radius, abs(uv.y));\n\n  float len = length(vec2(rx, ry));\n\n  float a = 1.0 - mx * my * step(radius, len) * smoothstep(0., radius * 0.01, len - radius);\n  o = vec4(o.rgb, o.a * a);\n  #endif\n  gl_FragColor = o;\n}\n"
       },
       "glsl3": {
         "vert": "\nprecision highp float;\nuniform CCGlobal {\n  vec4 cc_time;\n\n  vec4 cc_screenSize;\n\n  vec4 cc_screenScale;\n\n  vec4 cc_nativeSize;\n\n  mat4 cc_matView;\n  mat4 cc_matViewInv;\n  mat4 cc_matProj;\n  mat4 cc_matProjInv;\n  mat4 cc_matViewProj;\n  mat4 cc_matViewProjInv;\n  vec4 cc_cameraPos;\n\n  vec4 cc_exposure;\n\n  vec4 cc_mainLitDir;\n\n  vec4 cc_mainLitColor;\n\n  vec4 cc_ambientSky;\n  vec4 cc_ambientGround;\n};\nuniform CCLocal {\n  mat4 cc_matWorld;\n  mat4 cc_matWorldIT;\n};\n\nin vec3 a_position;\nin vec4 a_color;\nout vec4 v_color;\n\n#if USE_TEXTURE\nin vec2 a_uv0;\nout vec2 v_uv0;\n#endif\n\nvoid main () {\n  vec4 pos = vec4(a_position, 1);\n\n  #if CC_USE_MODEL\n  pos = cc_matViewProj * cc_matWorld * pos;\n  #else\n  pos = cc_matViewProj * pos;\n  #endif\n\n  #if USE_TEXTURE\n  v_uv0 = a_uv0;\n  #endif\n\n  v_color = a_color;\n\n  gl_Position = pos;\n}\n",
-        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform ALPHA_TEST {\n    float alphaThreshold;\n  }\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nin vec4 v_color;\n\n#if USE_TEXTURE\nin vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if ENABLE_ROUNDCORNER\nuniform RoundCorner {\n\n  float roundCornerRadius;\n}\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if ENABLE_ROUNDCORNER\n  vec2 uv = v_uv0.xy - vec2(0.5, 0.5);\n  float rx = abs(uv.x) - (0.5 - roundCornerRadius);\n  float ry = abs(uv.y) - (0.5 - roundCornerRadius);\n  float mx = step(0.5 - roundCornerRadius, abs(uv.x));\n  float my = step(0.5 - roundCornerRadius, abs(uv.y));\n  float radius = length(vec2(rx, ry));\n  float a = 1.0 - mx * my * step(roundCornerRadius, radius) * smoothstep(0., roundCornerRadius * 0.01, radius - roundCornerRadius);\n  o = vec4(o.rgb, o.a * a);\n  #endif\n  gl_FragColor = o;\n}\n"
+        "frag": "\nprecision highp float;\n\n#if USE_ALPHA_TEST\n  \n  uniform ALPHA_TEST {\n    float alphaThreshold;\n  }\n#endif\n\nvoid ALPHA_TEST (in vec4 color) {\n  #if USE_ALPHA_TEST\n      if (color.a < alphaThreshold) discard;\n  #endif\n}\n\nvoid ALPHA_TEST (in float alpha) {\n  #if USE_ALPHA_TEST\n      if (alpha < alphaThreshold) discard;\n  #endif\n}\n\nin vec4 v_color;\n\n#if USE_TEXTURE\nin vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n\n#if ENABLE_ROUNDCORNER\nuniform RoundCorner {\n\n  float roundCornerRadius;\n}\n#endif\n\nvoid main () {\n  vec4 o = vec4(1, 1, 1, 1);\n\n  #if USE_TEXTURE\n  o *= texture(texture, v_uv0);\n    #if CC_USE_ALPHA_ATLAS_TEXTURE\n    o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n    #endif\n  #endif\n\n  o *= v_color;\n\n  ALPHA_TEST(o);\n\n  #if ENABLE_ROUNDCORNER\n\n  float radius = clamp(0.0, 0.5, roundCornerRadius);\n\n  vec2 uv = v_uv0.xy - vec2(0.5, 0.5);\n\n  float rx = abs(uv.x) - (0.5 - radius);\n  float ry = abs(uv.y) - (0.5 - radius);\n\n  float mx = step(0.5 - radius, abs(uv.x));\n  float my = step(0.5 - radius, abs(uv.y));\n\n  float len = length(vec2(rx, ry));\n\n  float a = 1.0 - mx * my * step(radius, len) * smoothstep(0., radius * 0.01, len - radius);\n  o = vec4(o.rgb, o.a * a);\n  #endif\n  gl_FragColor = o;\n}\n"
       }
     }
   ],