renderer_vulkan: ignore viewport stores on non-supporting drivers

src/shader_recompiler/backend/spirv/emit_spirv.cpp

@@ -407,7 +407,7 @@ void SetupCapabilities(const Profile& profile, const Info& info, EmitContext& ct
         }
         ctx.AddCapability(spv::Capability::DemoteToHelperInvocation);
     }
-    if (info.stores[IR::Attribute::ViewportIndex]) {
+    if (info.stores[IR::Attribute::ViewportIndex] && profile.support_multi_viewport) {
         ctx.AddCapability(spv::Capability::MultiViewport);
     }
     if (info.stores[IR::Attribute::ViewportMask] && profile.support_viewport_mask) {

src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp

@@ -84,6 +84,10 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
         }
         return std::nullopt;
     case IR::Attribute::ViewportIndex:
+        if (!ctx.profile.support_multi_viewport) {
+            LOG_WARNING(Shader, "Ignoring viewport index store on non-supporting driver");
+            return std::nullopt;
+        }
         if (ctx.profile.support_viewport_index_layer_non_geometry ||
             ctx.stage == Shader::Stage::Geometry) {
             return OutAttr{ctx.viewport_index, ctx.U32[1]};

src/shader_recompiler/profile.h

@@ -43,6 +43,7 @@ struct Profile {
     bool support_gl_sparse_textures{};
     bool support_gl_derivative_control{};
     bool support_scaled_attributes{};
+    bool support_multi_viewport{};
 
     bool warp_size_potentially_larger_than_guest{};
 

src/video_core/renderer_vulkan/vk_pipeline_cache.cpp

@@ -351,6 +351,7 @@ PipelineCache::PipelineCache(RasterizerVulkan& rasterizer_, const Device& device
         .support_geometry_shader_passthrough = device.IsNvGeometryShaderPassthroughSupported(),
         .support_native_ndc = device.IsExtDepthClipControlSupported(),
         .support_scaled_attributes = !device.MustEmulateScaledFormats(),
+        .support_multi_viewport = device.SupportsMultiViewport(),
 
         .warp_size_potentially_larger_than_guest = device.IsWarpSizePotentiallyBiggerThanGuest(),
 

src/video_core/vulkan_common/vulkan_device.h

@@ -669,6 +669,10 @@ public:
         return supports_conditional_barriers;
     }
 
+    bool SupportsMultiViewport() const {
+        return features2.features.multiViewport;
+    }
+
     [[nodiscard]] static constexpr bool CheckBrokenCompute(VkDriverId driver_id,
                                                            u32 driver_version) {
         if (driver_id == VK_DRIVER_ID_INTEL_PROPRIETARY_WINDOWS) {