From c0cedbae94a5c21297c369ed799458526cbf56c2 Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Sat, 28 Jan 2023 14:39:27 -0500
Subject: emit_glsl_image: Fix ImageFetch for MSAA textures

---
 src/shader_recompiler/backend/glsl/emit_glsl_image.cpp | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp b/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp
index cecdbb9d6..d8874b0cc 100644
--- a/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp
+++ b/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp
@@ -414,7 +414,7 @@ void EmitImageGatherDref(EmitContext& ctx, IR::Inst& inst, const IR::Value& inde
 
 void EmitImageFetch(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,
                     std::string_view coords, std::string_view offset, std::string_view lod,
-                    [[maybe_unused]] std::string_view ms) {
+                    std::string_view ms) {
     const auto info{inst.Flags<IR::TextureInstInfo>()};
     if (info.has_bias) {
         throw NotImplementedException("EmitImageFetch Bias texture samples");
@@ -431,19 +431,24 @@ void EmitImageFetch(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,
         ctx.AddU1("{}=true;", *sparse_inst);
     }
     if (!sparse_inst || !supports_sparse) {
-        if (!offset.empty()) {
-            ctx.Add("{}=texelFetchOffset({},{},int({}),{});", texel, texture,
-                    CoordsCastToInt(coords, info), lod, CoordsCastToInt(offset, info));
+        const auto int_coords{CoordsCastToInt(coords, info)};
+        if (!ms.empty()) {
+            ctx.Add("{}=texelFetch({},{},int({}));", texel, texture, int_coords, ms);
+        } else if (!offset.empty()) {
+            ctx.Add("{}=texelFetchOffset({},{},int({}),{});", texel, texture, int_coords, lod,
+                    CoordsCastToInt(offset, info));
         } else {
             if (info.type == TextureType::Buffer) {
                 ctx.Add("{}=texelFetch({},int({}));", texel, texture, coords);
             } else {
-                ctx.Add("{}=texelFetch({},{},int({}));", texel, texture,
-                        CoordsCastToInt(coords, info), lod);
+                ctx.Add("{}=texelFetch({},{},int({}));", texel, texture, int_coords, lod);
             }
         }
         return;
     }
+    if (!ms.empty()) {
+        throw NotImplementedException("EmitImageFetch Sparse MSAA samples");
+    }
     if (!offset.empty()) {
         ctx.AddU1("{}=sparseTexelsResidentARB(sparseTexelFetchOffsetARB({},{},int({}),{},{}));",
                   *sparse_inst, texture, CastToIntVec(coords, info), lod,
-- 
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