diff --git a/shaders/texture_loading/glsl/bg.frag.spv b/shaders/texture_loading/glsl/bg.frag.spv
index 2c12da6..1a968cf 100644
Binary files a/shaders/texture_loading/glsl/bg.frag.spv and b/shaders/texture_loading/glsl/bg.frag.spv differ
diff --git a/shaders/texture_loading/glsl/bg.vert b/shaders/texture_loading/glsl/bg.vert
index 335ebdc..9e096f3 100644
--- a/shaders/texture_loading/glsl/bg.vert
+++ b/shaders/texture_loading/glsl/bg.vert
@@ -1,29 +1,14 @@
 #version 450
 
-// 在没有顶点缓冲区的情况下，通过顶点ID生成全屏 quad
-// 顶点ID: 0=(-1,-1), 1=(1,-1), 2=(-1,1), 3=(1,1)
-out gl_PerVertex {
-    vec4 gl_Position;
-};
-
-layout(location = 0) out vec2 outUV;
+layout(location = 0) out vec2 uv;
 
 void main() {
-    vec2 pos;
-    vec2 uv;
-    if (gl_VertexIndex == 0) {
-        pos = vec2(-1.0, -1.0);
-        uv = vec2(0.0, 0.0);
-    } else if (gl_VertexIndex == 1) {
-        pos = vec2(1.0, -1.0);
-        uv = vec2(1.0, 0.0);
-    } else if (gl_VertexIndex == 2) {
-        pos = vec2(-1.0, 1.0);
-        uv = vec2(0.0, 1.0);
-    } else { // gl_VertexIndex == 3
-        pos = vec2(1.0, 1.0);
-        uv = vec2(1.0, 1.0);
-    }
-    gl_Position = vec4(pos, 0.0, 1.0);
-    outUV = uv;
+    // 使用NDC坐标(-1到1)，并为四个顶点分配位置
+    vec2 positions[4] = vec2[](
+        vec2(-1.0, -1.0), vec2(1.0, -1.0),
+        vec2(-1.0, 1.0), vec2(1.0, 1.0)
+    );
+    
+    uv = positions[gl_VertexIndex].xy * 0.5 + 0.5;
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
 }
\ No newline at end of file
diff --git a/shaders/texture_loading/glsl/bg.vert.spv b/shaders/texture_loading/glsl/bg.vert.spv
index fb7e2bc..7271ea0 100644
Binary files a/shaders/texture_loading/glsl/bg.vert.spv and b/shaders/texture_loading/glsl/bg.vert.spv differ