From: Iago Toral Quiroga <itoral@igalia.com>
Date: Fri, 2 Dec 2016 13:16:07 +0000 (+0100)
Subject: spirv: Builtin Layer is an input for fragment shaders
X-Git-Tag: upstream/17.1.0~4141
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=66e7effc8542aa725eb9c08d826ece009526cd50;p=platform%2Fupstream%2Fmesa.git

spirv: Builtin Layer is an input for fragment shaders

This change makes it so we emit a load_input intrinsic when Layer
is read in a fragment shader.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
---

diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index 917aa9d..a38d359 100644
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -819,7 +819,12 @@ vtn_get_builtin_location(struct vtn_builder *b,
       break;
    case SpvBuiltInLayer:
       *location = VARYING_SLOT_LAYER;
-      *mode = nir_var_shader_out;
+      if (b->shader->stage == MESA_SHADER_FRAGMENT)
+         *mode = nir_var_shader_in;
+      else if (b->shader->stage == MESA_SHADER_GEOMETRY)
+         *mode = nir_var_shader_out;
+      else
+         unreachable("invalid stage for SpvBuiltInLayer");
       break;
    case SpvBuiltInViewportIndex:
       *location = VARYING_SLOT_VIEWPORT;