diff --git a/assets/shaders/postprocess.vert.glsl b/assets/shaders/postprocess.vert.glsl
index aa78b1b5..2ed8f784 100644
--- a/assets/shaders/postprocess.vert.glsl
+++ b/assets/shaders/postprocess.vert.glsl
@@ -6,5 +6,7 @@ void main() {
     // Fullscreen triangle trick: 3 vertices, no vertex buffer
     TexCoord = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
     gl_Position = vec4(TexCoord * 2.0 - 1.0, 0.0, 1.0);
-    TexCoord.y = 1.0 - TexCoord.y; // flip Y for Vulkan
+    // No Y-flip: scene textures use Vulkan convention (v=0 at top),
+    // and NDC y=-1 already maps to framebuffer top, so the triangle
+    // naturally samples the correct row without any inversion.
 }
diff --git a/assets/shaders/postprocess.vert.spv b/assets/shaders/postprocess.vert.spv
index afc10472..89065a80 100644
Binary files a/assets/shaders/postprocess.vert.spv and b/assets/shaders/postprocess.vert.spv differ