--- a/data/lib/sysresource/shader/include/v2_vpcommon.cgh
+++ b/data/lib/sysresource/shader/include/v2_vpcommon.cgh
@@ -12,7 +12,7 @@
 #ifdef _USE_GPROGRAM
 #define END_VP_MAIN VOUT_VALUE(instanceID) = gl_InstanceID;}
 #else
-#define END_VP_MAIN gl_Position = vfio_position;VOUT_VALUE(instanceID) = gl_InstanceID;}
+#define END_VP_MAIN gl_Position = vfio_position + VIN_KEEPALIVE;VOUT_VALUE(instanceID) = gl_InstanceID;}
 #endif
 
 #extension GL_ARB_explicit_attrib_location : enable
@@ -47,6 +47,44 @@
 layout(location = 6) in vec4 vin_weights;
 #endif
 
+/* Keep vin_* attributes alive so Mesa's cross-stage DCE cannot mark them
+ * inactive (glGetAttribLocation would return -1 -> engine "Vertex Attribute
+ * Problem" -> white screen). Each term is scaled by float(drawCount == -9999),
+ * a uniform Mesa cannot constant-fold; drawCount is always >= 0 at runtime so
+ * the terms are exactly 0.0 and rendering is unaffected. Guarded by the same
+ * #ifdefs as the declarations so only declared attributes are referenced. */
+#ifdef _USE_NORMAL
+#define _VKA_N + vin_normal.x
+#else
+#define _VKA_N
+#endif
+#ifdef _USE_NORMALMAP
+#define _VKA_T + vin_tangent.x
+#else
+#define _VKA_T
+#endif
+#ifdef _USE_VP_TEXCOORD0
+#define _VKA_U0 + vin_uv0.x
+#else
+#define _VKA_U0
+#endif
+#ifdef _USE_VP_TEXCOORD1
+#define _VKA_U1 + vin_uv1.x
+#else
+#define _VKA_U1
+#endif
+#ifdef _USE_VP_COLOR
+#define _VKA_C + vin_color.x
+#else
+#define _VKA_C
+#endif
+#ifdef _USE_SKINNING
+#define _VKA_W + vin_weights.x
+#else
+#define _VKA_W
+#endif
+#define VIN_KEEPALIVE vec4((vin_position.x _VKA_N _VKA_T _VKA_U0 _VKA_U1 _VKA_C _VKA_W) * float(drawCount == -9999), 0.0, 0.0, 0.0)
+
 /*----------- Outpt --------------*/
 
 #ifdef _USE_GPROGRAM