[shader_recompiler] fix CBuf get/set VUUID due to using composite for U32[1], F32[1] (#3790)

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3790
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp

@@ -142,14 +142,12 @@ Id GetCbuf(EmitContext& ctx, Id result_type, Id UniformDefinitions::*member_ptr,
 
     const auto is_float = UniformDefinitions::IsFloat(member_ptr);
     const auto num_elements = UniformDefinitions::NumElements(member_ptr);
-    const std::array zero_vec{
-        is_float ? ctx.Const(0.0f) : ctx.Const(0u),
-        is_float ? ctx.Const(0.0f) : ctx.Const(0u),
-        is_float ? ctx.Const(0.0f) : ctx.Const(0u),
-        is_float ? ctx.Const(0.0f) : ctx.Const(0u),
-    };
+    auto const zero_const = is_float ? ctx.Const(0.0f) : ctx.Const(0u);
+    const std::array zero_vec{zero_const, zero_const, zero_const, zero_const};
     const Id cond = ctx.OpULessThanEqual(ctx.TypeBool(), buffer_offset, ctx.Const(0xFFFFu));
-    const Id zero = ctx.OpCompositeConstruct(result_type, std::span(zero_vec.data(), num_elements));
+    const Id zero = num_elements > 1
+        ? ctx.OpCompositeConstruct(result_type, std::span(zero_vec.data(), num_elements))
+        : zero_const;
     return ctx.OpSelect(result_type, cond, val, zero);
 }