diff --git a/app/src/main/assets/shaders/bg.frag b/app/src/main/assets/shaders/bg.frag
index ee29b3d..52a3257 100644
--- a/app/src/main/assets/shaders/bg.frag
+++ b/app/src/main/assets/shaders/bg.frag
@@ -9,7 +9,33 @@ layout(location = 0) out vec4 outColor;
 // 纹理采样器
 layout(binding = 0) uniform sampler2D texSampler;
 
+layout(push_constant) uniform PushConstants {
+    float zoom;
+	float r;
+	float g;
+	float b;
+	float radius;
+	float ux;
+	float uy;
+} pushConstants;
+
 void main() {
-    // 采样纹理
-    outColor = texture(texSampler, inTexCoord);
+    // outFragColor = color;
+    // 获取当前片元的屏幕坐标（左下角为原点）
+    vec2 fragCoord = gl_FragCoord.xy;
+
+    // 屏幕中心（480x480 的中心是 (240, 240)）
+    vec2 center = vec2(240.0, 240.0);
+
+    // 计算到中心的距离（欧氏距离，单位：像素）
+    float dist = length(fragCoord - center);
+
+    // 判断是否在半径之外
+    if (dist > pushConstants.radius) {
+        // 使用 push constant 中的 RGB 颜色（注意 alpha 设为 1.0）
+        outColor = vec4(pushConstants.r, pushConstants.g, pushConstants.b, 1.0);
+    } else {
+        // 采样纹理
+        outColor = texture(texSampler, inTexCoord);
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/assets/shaders/bg.frag.spv b/app/src/main/assets/shaders/bg.frag.spv
index 8642dc5..dcb02d2 100644
Binary files a/app/src/main/assets/shaders/bg.frag.spv and b/app/src/main/assets/shaders/bg.frag.spv differ
diff --git a/app/src/main/assets/shaders/bg.vert b/app/src/main/assets/shaders/bg.vert
index 5ff8f1b..da07cd8 100644
--- a/app/src/main/assets/shaders/bg.vert
+++ b/app/src/main/assets/shaders/bg.vert
@@ -38,7 +38,13 @@ const vec2 texCoords[6] = vec2[6](
 
 // 定义 Push Constant，只有一个 float
 layout(push_constant) uniform PushConstants {
-    float myValue;
+    float zoom;
+	float r;
+	float g;
+	float b;
+	float radius;
+	float ux;
+	float uy;
 } pushConstants;
 
 
@@ -48,7 +54,7 @@ layout(location = 0) out vec2 outTexCoord;
 void main() {
     // 获取顶点位置
     vec2 position = positions[gl_VertexIndex];
-    position = position * pushConstants.myValue;
+    position = position * pushConstants.zoom;
     
     // 设置输出位置（Vulkan使用不同的坐标系）
     gl_Position = vec4(position, 0.0, 1.0);
diff --git a/app/src/main/assets/shaders/bg.vert.spv b/app/src/main/assets/shaders/bg.vert.spv
index f261695..c90eedd 100644
Binary files a/app/src/main/assets/shaders/bg.vert.spv and b/app/src/main/assets/shaders/bg.vert.spv differ
diff --git a/app/src/main/assets/shaders/texture.frag b/app/src/main/assets/shaders/texture.frag
index 7fb8a9a..e228877 100644
--- a/app/src/main/assets/shaders/texture.frag
+++ b/app/src/main/assets/shaders/texture.frag
@@ -6,7 +6,11 @@ layout (location = 0) in vec2 inUV;
 layout (location = 1) in vec3 inNormal;
 
 layout(push_constant) uniform PushConstants {
-    float myValue;
+    float zoom;
+	float r;
+	float g;
+	float b;
+	float radius;
 	float ux;
 	float uy;
 } pushConstants;
@@ -16,10 +20,25 @@ layout (location = 0) out vec4 outFragColor;
 
 void main() 
 {
-    vec2 pos = vec2(pushConstants.ux/4096.f, pushConstants.uy/2048.f);
-    vec2 uv = pos + vec2(inUV.x/8.f, inUV.y/4.f);
-	vec4 color = texture(samplerColor, uv);
+    // outFragColor = color;
+    // 获取当前片元的屏幕坐标（左下角为原点）
+    vec2 fragCoord = gl_FragCoord.xy;
 
-    outFragColor = color;
+    // 屏幕中心（480x480 的中心是 (240, 240)）
+    vec2 center = vec2(240.0, 240.0);
+
+    // 计算到中心的距离（欧氏距离，单位：像素）
+    float dist = length(fragCoord - center);
+
+    // 判断是否在半径之外
+    if (dist > pushConstants.radius) {
+        // 使用 push constant 中的 RGB 颜色（注意 alpha 设为 1.0）
+        outFragColor = vec4(pushConstants.r, pushConstants.g, pushConstants.b, 1.0);
+    } else {
+        vec2 pos = vec2(pushConstants.ux/4096.f, pushConstants.uy/2048.f);
+        vec2 uv = pos + vec2(inUV.x/8.f, inUV.y/4.f);
+        vec4 color = texture(samplerColor, uv);
+        outFragColor = color;
+    }
 
 }
\ No newline at end of file
diff --git a/app/src/main/assets/shaders/texture.frag.spv b/app/src/main/assets/shaders/texture.frag.spv
index c9188ac..0c4f42b 100644
Binary files a/app/src/main/assets/shaders/texture.frag.spv and b/app/src/main/assets/shaders/texture.frag.spv differ
diff --git a/app/src/main/assets/shaders/texture.vert b/app/src/main/assets/shaders/texture.vert
index 1cd1180..fe8b0ac 100644
--- a/app/src/main/assets/shaders/texture.vert
+++ b/app/src/main/assets/shaders/texture.vert
@@ -17,7 +17,11 @@ layout (location = 0) out vec2 outUV;
 layout (location = 1) out vec3 outNormal;
 
 layout(push_constant) uniform PushConstants {
-    float myValue;
+    float zoom;
+	float r;
+	float g;
+	float b;
+	float radius;
 	float ux;
 	float uy;
 } pushConstants;
@@ -32,7 +36,7 @@ void main()
 	outUV = inUV;
 
 	vec2 position = vec2(inPos.xy*2 -1);
-    position = position * pushConstants.myValue;
+    position = position * pushConstants.zoom;
     gl_Position = vec4(position, 0.5, 1.0);
 
     vec4 pos = ubo.model * vec4(inPos, 1.0);
diff --git a/app/src/main/assets/shaders/texture.vert.spv b/app/src/main/assets/shaders/texture.vert.spv
index 63c5499..2084859 100644
Binary files a/app/src/main/assets/shaders/texture.vert.spv and b/app/src/main/assets/shaders/texture.vert.spv differ
diff --git a/vulkan/FaceApp.cpp b/vulkan/FaceApp.cpp
index 0ccb824..dbf54e3 100644
--- a/vulkan/FaceApp.cpp
+++ b/vulkan/FaceApp.cpp
@@ -546,7 +546,7 @@ void FaceApp::setup_descriptor_set_layout()
 	VkPushConstantRange pushConstantRanges[1];
 	pushConstantRanges[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT| VK_SHADER_STAGE_FRAGMENT_BIT;
 	pushConstantRanges[0].offset = 0;
-	pushConstantRanges[0].size = sizeof(float)*3;
+	pushConstantRanges[0].size = sizeof(PushConstants);
 
 	//pushConstantRanges[1].stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT;
 	//pushConstantRanges[1].offset = sizeof(float);
@@ -691,7 +691,7 @@ void FaceApp::render(VkCommandBuffer commandBuffer, long long frameTime)
 
 	vkCmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, m_pipelineLayout_bg, 0, 1, &m_descriptor_set_bg, 0, NULL);
 	vkCmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, m_graphicsPipeline_bg);
-	vkCmdPushConstants(commandBuffer, m_pipelineLayout_bg, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(float), &myFloatValue);
+	vkCmdPushConstants(commandBuffer, m_pipelineLayout_bg, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(pushConstants), &pushConstants);
 
 	
 
@@ -713,21 +713,21 @@ void FaceApp::render(VkCommandBuffer commandBuffer, long long frameTime)
 	//	vkCmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, m_pipelineLayout, 0, 1, &m_descriptor_sets_right[_curMotionIndex], 0, NULL);
 	//}
 
-	float fsValues[3] = { myFloatValue, 0 , 0};
+	//float fsValues[3] = { myFloatValue, 0 , 0};
 	if (_curMotionIndex < _curMotions.size())
 	{
 		if (_curFrameIndex < _curMotions[_curMotionIndex].frames.size())
 		{
 			float ux = _curMotions[_curMotionIndex].frames[_curFrameIndex].x;
 			float uy = _curMotions[_curMotionIndex].frames[_curFrameIndex].y;
-			fsValues[1] = ux;
-			fsValues[2] = uy;
+			pushConstants.ux = ux;
+			pushConstants.uy = uy;
 		}
 	}
 	//fsValues[1] = 0;
 	//fsValues[2] = 360;
 
-	vkCmdPushConstants(commandBuffer, m_pipelineLayout, VK_SHADER_STAGE_VERTEX_BIT| VK_SHADER_STAGE_FRAGMENT_BIT, 0, sizeof(fsValues), &fsValues);
+	vkCmdPushConstants(commandBuffer, m_pipelineLayout, VK_SHADER_STAGE_VERTEX_BIT| VK_SHADER_STAGE_FRAGMENT_BIT, 0, sizeof(pushConstants), &pushConstants);
 	//vkCmdPushConstants(commandBuffer, m_pipelineLayout, VK_SHADER_STAGE_FRAGMENT_BIT, 0, sizeof(fsValues), fsValues);
 
 
@@ -1169,7 +1169,7 @@ void FaceApp::setup_descriptor_set_layout_bg()
 	VkPushConstantRange pushConstantRanges[1];
 	pushConstantRanges[0].stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
 	pushConstantRanges[0].offset = 0;
-	pushConstantRanges[0].size = sizeof(float);
+	pushConstantRanges[0].size = sizeof(PushConstants);
 
 	pipeline_layout_create_info.pushConstantRangeCount = 1;
 	pipeline_layout_create_info.pPushConstantRanges = &pushConstantRanges[0];
@@ -1372,7 +1372,11 @@ void FaceApp::cleanup()
 void FaceApp::SetInitArg(const char* arg)
 {
 	_initArg = json::parse(arg);
-	
+	pushConstants.zoom = _initArg.zoom;
+	pushConstants.r = _initArg.r;
+	pushConstants.g = _initArg.g;
+	pushConstants.b = _initArg.b;
+	pushConstants.radius = _initArg.radius;
 }
 
 void FaceApp::drawFrame(long long frameTime)
diff --git a/vulkan/FaceApp.h b/vulkan/FaceApp.h
index 8ee3ff8..da49e53 100644
--- a/vulkan/FaceApp.h
+++ b/vulkan/FaceApp.h
@@ -38,13 +38,23 @@ struct InitArg
 {
     int action_fps;
     float zoom;
+    float r;
+    float g;
+    float b;
+    float radius;
     //Motion motion;
-    NLOHMANN_DEFINE_TYPE_INTRUSIVE(InitArg, action_fps, zoom);
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE(InitArg, action_fps, zoom, r, g, b, radius);
 };
 
 
 struct PushConstants {
-	float myValue;
+    float zoom = 0.5f;
+    float r = 0;
+    float g = 0;
+    float b = 0;
+    float radius = 240;
+    float ux = 0;
+    float uy = 0;
 };
 
 using Callback = std::function<void()>;
@@ -149,7 +159,8 @@ private:
     
     
 
-    float myFloatValue = 1.5f;
+    //float myFloatValue = 1.5f;
+    PushConstants pushConstants;
 
 
     
diff --git a/vulkan/main.cpp b/vulkan/main.cpp
index cdc5d42..602e03b 100644
--- a/vulkan/main.cpp
+++ b/vulkan/main.cpp
@@ -150,6 +150,10 @@ int main() {
 
     init_arg.action_fps = 10;
     init_arg.zoom = 1.5f;
+    init_arg.r = 1;
+    init_arg.g = 0;
+    init_arg.b = 0;
+    init_arg.radius = 240;
 
     string json_str = json(init_arg).dump();