shader/texture: Implement CUBE texture type for TMML and fix arrays

TMML takes an array argument that has no known meaning, this one appears
as the first component in gpr8 followed by s, t and r. Skip this
component when arrays are being used. Also implement CUBE texture types.

- Used by Pikmin 3: Deluxe Demo.

src/video_core/shader/decode/texture.cpp

@@ -292,33 +292,36 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
             break;
         }
 
-        std::vector<Node> coords;
-
-        // TODO: Add coordinates for different samplers once other texture types are implemented.
-        switch (texture_type) {
-        case TextureType::Texture1D:
-            coords.push_back(GetRegister(instr.gpr8));
-            break;
-        case TextureType::Texture2D:
-            coords.push_back(GetRegister(instr.gpr8.Value() + 0));
-            coords.push_back(GetRegister(instr.gpr8.Value() + 1));
-            break;
-        default:
-            UNIMPLEMENTED_MSG("Unhandled texture type {}", static_cast<int>(texture_type));
+        const u64 base_index = is_array ? 1 : 0;
+        const u64 num_components = [texture_type] {
+            switch (texture_type) {
+            case TextureType::Texture1D:
+                return 1;
+            case TextureType::Texture2D:
+                return 2;
+            case TextureType::TextureCube:
+                return 3;
+            default:
+                UNIMPLEMENTED_MSG("Unhandled texture type {}", static_cast<int>(texture_type));
+                return 2;
+            }
+        }();
+        // TODO: What's the array component used for?
 
-            // Fallback to interpreting as a 2D texture for now
-            coords.push_back(GetRegister(instr.gpr8.Value() + 0));
-            coords.push_back(GetRegister(instr.gpr8.Value() + 1));
+        std::vector<Node> coords;
+        coords.reserve(num_components);
+        for (u64 component = 0; component < num_components; ++component) {
+            coords.push_back(GetRegister(instr.gpr8.Value() + base_index + component));
         }
+
         u32 indexer = 0;
         for (u32 element = 0; element < 2; ++element) {
             if (!instr.tmml.IsComponentEnabled(element)) {
                 continue;
             }
-            auto params = coords;
             MetaTexture meta{*sampler, {}, {}, {}, {}, {}, {}, {}, {}, element, index_var};
-            const Node value = Operation(OperationCode::TextureQueryLod, meta, std::move(params));
-            SetTemporary(bb, indexer++, value);
+            Node value = Operation(OperationCode::TextureQueryLod, meta, coords);
+            SetTemporary(bb, indexer++, std::move(value));
         }
         for (u32 i = 0; i < indexer; ++i) {
             SetRegister(bb, instr.gpr0.Value() + i, GetTemporary(i));