v3d: Add support for gl_HelperInvocation.

We can just look at the MSF flags -- if they're unset, then we're
definitely in a helper invocation.  Fixes
dEQP-GLES31.functional.shaders.helper_invocation.* with GLES3.1 enabled.

diff --git a/src/broadcom/compiler/nir_to_vir.c b/src/broadcom/compiler/nir_to_vir.c
index e01668c62c07b32449d046eec4b741d4a2179070..73fed4e816b5087d9e70151905b3b9e6b58f934c 100644 (file)
--- a/src/broadcom/compiler/nir_to_vir.c
+++ b/src/broadcom/compiler/nir_to_vir.c
@@ -1596,6 +1596,14 @@ ntq_emit_intrinsic(struct v3d_compile *c, nir_intrinsic_instr *instr)
                 ntq_store_dest(c, &instr->dest, 0, vir_MSF(c));
                 break;
 
+        case nir_intrinsic_load_helper_invocation:
+                vir_PF(c, vir_MSF(c), V3D_QPU_PF_PUSHZ);
+                ntq_store_dest(c, &instr->dest, 0,
+                               vir_MOV(c, vir_SEL(c, V3D_QPU_COND_IFA,
+                                                  vir_uniform_ui(c, ~0),
+                                                  vir_uniform_ui(c, 0))));
+                break;
+
         case nir_intrinsic_load_front_face:
                 /* The register contains 0 (front) or 1 (back), and we need to
                  * turn it into a NIR bool where true means front.