Revert "v3d: do not report alpha-test as supported"

This reverts commit 9d0523b569.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Jose Maria Casanova <jmcasanova@igalia.com>

src/broadcom/compiler/nir_to_vir.c

@@ -2030,6 +2030,11 @@ ntq_emit_intrinsic(struct v3d_compile *c, nir_intrinsic_instr *instr)
                                vir_uniform(c, QUNIFORM_VIEWPORT_Z_OFFSET, 0));
                 break;
 
+        case nir_intrinsic_load_alpha_ref_float:
+                ntq_store_dest(c, &instr->dest, 0,
+                               vir_uniform(c, QUNIFORM_ALPHA_REF, 0));
+                break;
+
         case nir_intrinsic_load_sample_mask_in:
                 ntq_store_dest(c, &instr->dest, 0, vir_MSF(c));
                 break;

src/broadcom/compiler/vir.c

@@ -844,6 +844,12 @@ v3d_nir_lower_fs_late(struct v3d_compile *c)
         if (c->fs_key->clamp_color)
                 NIR_PASS_V(c->s, nir_lower_clamp_color_outputs);
 
+        if (c->fs_key->alpha_test) {
+                NIR_PASS_V(c->s, nir_lower_alpha_test,
+                           c->fs_key->alpha_test_func,
+                           false, NULL);
+        }
+
         if (c->key->ucp_enables)
                 NIR_PASS_V(c->s, nir_lower_clip_fs, c->key->ucp_enables,
                            false);

src/gallium/drivers/v3d/v3d_screen.c

@@ -251,9 +251,6 @@ v3d_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_UMA:
                 return 1;
 
-        case PIPE_CAP_ALPHA_TEST:
-                return 0;
-
         default:
                 return u_pipe_screen_get_param_defaults(pscreen, param);
         }