glsl: Add helperInvocationEXT() builtin

From EXT_demote_to_helper_invocation, implemented with the existing
nir_intrinsic_is_helper_invocation.

Such builtin is necessary when using `demote` because we can't
redefine the value of gl_HelperInvocation (since it is an input
variable).

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index b0afe2d2385..799c161cfaf 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -4120,6 +4120,7 @@ glsl_to_tgsi_visitor::visit(ir_call *ir)
    case ir_intrinsic_generic_atomic_comp_swap:
    case ir_intrinsic_begin_invocation_interlock:
    case ir_intrinsic_end_invocation_interlock:
+   case ir_intrinsic_helper_invocation:
       unreachable("Invalid intrinsic");
    }
 }