spirv: add an options to lower SpvOpTerminateInvocation to OpKill

To workaround game bugs like Indiana Jones.

Original workaround found by Hans-Kristian.

Cc: mesa-stable
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32606>

src/compiler/spirv/nir_spirv.h

@@ -136,6 +136,11 @@ struct spirv_to_nir_options {
    /* Force SSBO accesses to be non-uniform. */
    bool force_ssbo_non_uniform;
 
+   /* Whether OpTerminateInvocation should be lowered to OpKill to workaround
+    * game bugs.
+    */
+   bool lower_terminate_to_discard;
+
    /* In Debug Builds, instead of emitting an OS break on failure, just return NULL from
     * spirv_to_nir().  This is useful for the unit tests that want to report a test failed
     * but continue executing other tests.

src/compiler/spirv/vtn_structured_cfg.c

@@ -976,7 +976,10 @@ branch_type_for_terminator(struct vtn_builder *b, struct vtn_block *block)
    case SpvOpKill:
       return vtn_branch_type_discard;
    case SpvOpTerminateInvocation:
-      return vtn_branch_type_terminate_invocation;
+      if (b->options->lower_terminate_to_discard)
+         return vtn_branch_type_discard;
+      else
+         return vtn_branch_type_terminate_invocation;
    case SpvOpIgnoreIntersectionKHR:
       return vtn_branch_type_ignore_intersection;
    case SpvOpTerminateRayKHR: