Mesa (master): nir: Add a face_sysval argument to nir_lower_two_sided_color

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Module: Mesa
Branch: master
Commit: 314ba5e17450c8c14c2191bcd5675a9eaaac69d8
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=314ba5e17450c8c14c2191bcd5675a9eaaac69d8

Author: Icecream95 <ixn at keemail.me>
Date:   Tue Jul 14 22:17:34 2020 +1200

nir: Add a face_sysval argument to nir_lower_two_sided_color

This is needed for handling drivers that use an input for loading the
face, for example Panfrost with Midgard GPUs.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
Reviewed-by: Rob Clark <robdclark at chromium.org>
Tested-by: Urja Rannikko <urjaman at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5915>

---

 src/broadcom/compiler/vir.c                  | 2 +-
 src/compiler/nir/nir.h                       | 2 +-
 src/compiler/nir/nir_lower_two_sided_color.c | 2 +-
 src/freedreno/ir3/ir3_nir.c                  | 2 +-
 src/gallium/drivers/vc4/vc4_program.c        | 2 +-
 src/mesa/state_tracker/st_program.c          | 3 ++-
 6 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/broadcom/compiler/vir.c b/src/broadcom/compiler/vir.c
index d26a3250ead..44ee75697df 100644
--- a/src/broadcom/compiler/vir.c
+++ b/src/broadcom/compiler/vir.c
@@ -939,7 +939,7 @@ static void
 v3d_nir_lower_fs_late(struct v3d_compile *c)
 {
         if (c->fs_key->light_twoside)
-                NIR_PASS_V(c->s, nir_lower_two_sided_color);
+                NIR_PASS_V(c->s, nir_lower_two_sided_color, true);
 
         if (c->fs_key->clamp_color)
                 NIR_PASS_V(c->s, nir_lower_clamp_color_outputs);
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index e0caedaf5f4..281e290f447 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -4374,7 +4374,7 @@ void nir_lower_point_size_mov(nir_shader *shader,
 
 bool nir_lower_frexp(nir_shader *nir);
 
-void nir_lower_two_sided_color(nir_shader *shader);
+void nir_lower_two_sided_color(nir_shader *shader, bool face_sysval);
 
 bool nir_lower_clamp_color_outputs(nir_shader *shader);
 
diff --git a/src/compiler/nir/nir_lower_two_sided_color.c b/src/compiler/nir/nir_lower_two_sided_color.c
index 04bb5d1ec76..1cab733f5d4 100644
--- a/src/compiler/nir/nir_lower_two_sided_color.c
+++ b/src/compiler/nir/nir_lower_two_sided_color.c
@@ -195,7 +195,7 @@ nir_lower_two_sided_color_impl(nir_function_impl *impl,
 }
 
 void
-nir_lower_two_sided_color(nir_shader *shader)
+nir_lower_two_sided_color(nir_shader *shader, bool face_sysval)
 {
    lower_2side_state state = {
       .shader = shader,
diff --git a/src/freedreno/ir3/ir3_nir.c b/src/freedreno/ir3/ir3_nir.c
index 74013aa3bd1..c779a57f7c5 100644
--- a/src/freedreno/ir3/ir3_nir.c
+++ b/src/freedreno/ir3/ir3_nir.c
@@ -412,7 +412,7 @@ ir3_nir_lower_variant(struct ir3_shader_variant *so, nir_shader *s)
 			progress |= OPT(s, ir3_nir_lower_layer_id);
 	}
 	if (so->key.color_two_side) {
-		OPT_V(s, nir_lower_two_sided_color);
+		OPT_V(s, nir_lower_two_sided_color, true);
 		progress = true;
 	}
 
diff --git a/src/gallium/drivers/vc4/vc4_program.c b/src/gallium/drivers/vc4/vc4_program.c
index 3ad81a05909..6a429d427b1 100644
--- a/src/gallium/drivers/vc4/vc4_program.c
+++ b/src/gallium/drivers/vc4/vc4_program.c
@@ -2304,7 +2304,7 @@ vc4_shader_ntq(struct vc4_context *vc4, enum qstage stage,
         NIR_PASS_V(c->s, nir_lower_tex, &tex_options);
 
         if (c->fs_key && c->fs_key->light_twoside)
-                NIR_PASS_V(c->s, nir_lower_two_sided_color);
+                NIR_PASS_V(c->s, nir_lower_two_sided_color, true);
 
         if (c->vs_key && c->vs_key->clamp_color)
                 NIR_PASS_V(c->s, nir_lower_clamp_color_outputs);
diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index d0e16cf16a8..97861cc404e 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -1278,7 +1278,8 @@ st_create_fp_variant(struct st_context *st,
       }
 
       if (key->lower_two_sided_color) {
-         NIR_PASS_V(state.ir.nir, nir_lower_two_sided_color);
+         bool face_sysval = st->ctx->Const.GLSLFrontFacingIsSysVal;
+         NIR_PASS_V(state.ir.nir, nir_lower_two_sided_color, face_sysval);
          finalize = true;
       }