opengl: Declare fragment outputs even if they are not used

Fixes Ori and the Blind Forest's menu on GLASM. For some reason
(probably high level optimizations) it is not sanitized on SPIR-V for
OpenGL. Vulkan is unaffected by this change.

1 files changed, 3 insertions, 7 deletions

diff --git a/src/shader_recompiler/backend/glasm/emit_context.cpp b/src/shader_recompiler/backend/glasm/emit_context.cpp
index e18526816..08918a5c2 100644
--- a/src/shader_recompiler/backend/glasm/emit_context.cpp
+++ b/src/shader_recompiler/backend/glasm/emit_context.cpp
@@ -117,13 +117,9 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
                 index, index);
         }
     }
-    for (size_t index = 0; index < info.stores_frag_color.size(); ++index) {
-        if (!info.stores_frag_color[index]) {
-            continue;
-        }
-        if (index == 0) {
-            Add("OUTPUT frag_color0=result.color;");
-        } else {
+    if (stage == Stage::Fragment) {
+        Add("OUTPUT frag_color0=result.color;");
+        for (size_t index = 1; index < info.stores_frag_color.size(); ++index) {
             Add("OUTPUT frag_color{}=result.color[{}];", index, index);
         }
     }