Mesa (master): v3d: Implement the line coord intrinsic

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Module: Mesa
Branch: master
Commit: 2c4616368b963c8aebfb549eec7a517fc5f8589e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2c4616368b963c8aebfb549eec7a517fc5f8589e

Author: Neil Roberts <nroberts at igalia.com>
Date:   Mon Jun 22 14:25:08 2020 +0200

v3d: Implement the line coord intrinsic

The line coord intrinsic is loaded from the implicit varying stored in
the same slot as the point coord when drawing lines.

Reviewed-by: Eric Anholt <eric at anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5624>

---

 src/broadcom/compiler/nir_to_vir.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/broadcom/compiler/nir_to_vir.c b/src/broadcom/compiler/nir_to_vir.c
index 2b641240d53..3fba318373f 100644
--- a/src/broadcom/compiler/nir_to_vir.c
+++ b/src/broadcom/compiler/nir_to_vir.c
@@ -2165,6 +2165,10 @@ ntq_emit_intrinsic(struct v3d_compile *c, nir_intrinsic_instr *instr)
                                vir_uniform(c, QUNIFORM_ALPHA_REF, 0));
                 break;
 
+        case nir_intrinsic_load_line_coord:
+                ntq_store_dest(c, &instr->dest, 0, vir_MOV(c, c->line_x));
+                break;
+
         case nir_intrinsic_load_sample_mask_in:
                 ntq_store_dest(c, &instr->dest, 0, vir_MSF(c));
                 break;
@@ -2720,7 +2724,10 @@ nir_to_vir(struct v3d_compile *c)
                         c->point_x = emit_fragment_varying(c, NULL, 0, 0);
                         c->point_y = emit_fragment_varying(c, NULL, 0, 0);
                         c->uses_implicit_point_line_varyings = true;
-                } else if (c->fs_key->is_lines && c->devinfo->ver < 40) {
+                } else if (c->fs_key->is_lines &&
+                           (c->devinfo->ver < 40 ||
+                            (c->s->info.system_values_read &
+                             BITFIELD64_BIT(SYSTEM_VALUE_LINE_COORD)))) {
                         c->line_x = emit_fragment_varying(c, NULL, 0, 0);
                         c->uses_implicit_point_line_varyings = true;
                 }