diff -rup mesa-17.2.1/src/mesa/main/transformfeedback.c mesa-17.2.1.new/src/mesa/main/transformfeedback.c
--- mesa-17.2.1/src/mesa/main/transformfeedback.c	2017-09-18 01:03:22.000000000 +0200
+++ mesa-17.2.1.new/src/mesa/main/transformfeedback.c	2017-09-20 19:24:54.379197797 +0200
@@ -421,6 +421,10 @@ _mesa_BeginTransformFeedback(GLenum mode
    if (info->NumOutputs == 0) {
       _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glBeginTransformFeedback(no varyings to record)");
+
+      fprintf(stderr, "Aborted! TFB varyings not correctly set!\n");
+      fprintf(stderr, "source->Id = %d\n", source->Id);
+      exit(1);
       return;
    }
 
@@ -815,6 +819,7 @@ _mesa_TransformFeedbackVaryings(GLuint p
 {
    struct gl_shader_program *shProg;
    GLint i;
+   bool tw3_varying_hack_enabled = false;
    GET_CURRENT_CONTEXT(ctx);
 
    /* From the ARB_transform_feedback2 specification:
@@ -889,6 +894,12 @@ _mesa_TransformFeedbackVaryings(GLuint p
    }
    free(shProg->TransformFeedback.VaryingNames);
 
+   if (count == 0) {
+      fprintf(stderr, "*** The Witcher 3 SPECIAL HACK ENABLED ***\n");
+      tw3_varying_hack_enabled = true;
+      count = 1;
+   }
+
    /* allocate new memory for varying names */
    shProg->TransformFeedback.VaryingNames =
       malloc(count * sizeof(GLchar *));
@@ -898,9 +909,13 @@ _mesa_TransformFeedbackVaryings(GLuint p
       return;
    }
 
-   /* Save the new names and the count */
-   for (i = 0; i < count; i++) {
-      shProg->TransformFeedback.VaryingNames[i] = strdup(varyings[i]);
+   if (tw3_varying_hack_enabled) {
+      shProg->TransformFeedback.VaryingNames[0] = strdup("shader_in_out.reg0");
+   } else {
+      /* Save the new names and the count */
+      for (i = 0; i < count; i++) {
+         shProg->TransformFeedback.VaryingNames[i] = strdup(varyings[i]);
+      }
    }
    shProg->TransformFeedback.NumVarying = count;