Mesa (master): nir/spirv: Add the option to keep ViewIndex as an input

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Module: Mesa
Branch: master
Commit: 340c73d4efd6198df077bc0f8b4e670df42f6ec6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=340c73d4efd6198df077bc0f8b4e670df42f6ec6

Author: Connor Abbott <cwabbott0 at gmail.com>
Date:   Tue Jun 30 13:47:22 2020 +0200

nir/spirv: Add the option to keep ViewIndex as an input

This is necessary for fragment shaders on adreno.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5719>

---

 src/compiler/spirv/nir_spirv.h     | 4 ++++
 src/compiler/spirv/vtn_variables.c | 9 +++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/compiler/spirv/nir_spirv.h b/src/compiler/spirv/nir_spirv.h
index 3d6f74e43ca..3cbd0269ffe 100644
--- a/src/compiler/spirv/nir_spirv.h
+++ b/src/compiler/spirv/nir_spirv.h
@@ -64,6 +64,10 @@ struct spirv_to_nir_options {
     */
    bool frag_coord_is_sysval;
 
+   /* Whether to keep ViewIndex as an input instead of rewriting to a sysval.
+    */
+   bool view_index_is_input;
+
    struct spirv_supported_capabilities caps;
 
    /* Address format for various kinds of pointers. */
diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index 1cb848a3af8..a7ccafdc8b9 100644
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -1436,8 +1436,13 @@ vtn_get_builtin_location(struct vtn_builder *b,
       set_mode_system_value(b, mode);
       break;
    case SpvBuiltInViewIndex:
-      *location = SYSTEM_VALUE_VIEW_INDEX;
-      set_mode_system_value(b, mode);
+      if (b->options && b->options->view_index_is_input) {
+         *location = VARYING_SLOT_VIEW_INDEX;
+         vtn_assert(*mode == nir_var_shader_in);
+      } else {
+         *location = SYSTEM_VALUE_VIEW_INDEX;
+         set_mode_system_value(b, mode);
+      }
       break;
    case SpvBuiltInSubgroupEqMask:
       *location = SYSTEM_VALUE_SUBGROUP_EQ_MASK,