vendor dependencies, make some changes to how input is done

vendor/github.com/hajimehoshi/ebiten/v2/internal/affine/affine.go

@@ -0,0 +1,29 @@
+// Copyright 2014 Hajime Hoshi
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package affine
+
+func mulSquare(lhs, rhs *[16]float32, dim int) [16]float32 {
+	result := [16]float32{}
+	for i := 0; i < dim; i++ {
+		for j := 0; j < dim; j++ {
+			e := float32(0.0)
+			for k := 0; k < dim; k++ {
+				e += lhs[i*dim+k] * rhs[k*dim+j]
+			}
+			result[i*dim+j] = e
+		}
+	}
+	return result
+}