ebiten/mipmap_test.go

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// Copyright 2018 The Ebiten Authors
//
// 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 ebiten_test
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import (
"math"
"testing"
. "github.com/hajimehoshi/ebiten"
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)
func TestMipmapLevelForDownscale(t *testing.T) {
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inf := float32(math.Inf(1))
cases := []struct {
In float32
Out int
}{
{1, 0},
{-1, 0},
{2, 0},
{-2, 0},
{100, 0},
{-100, 0},
{1.0 / 2.0, 0},
{-1.0 / 2.0, 0},
{1.0 / 4.0, 0},
{-1.0 / 4.0, 0},
{math.Nextafter32(1.0/4.0, 0), 1},
{math.Nextafter32(-1.0/4.0, 0), 1},
{1.0 / 8.0, 1},
{-1.0 / 8.0, 1},
{1.0 / 16.0, 1},
{-1.0 / 16.0, 1},
{math.Nextafter32(1.0/16.0, 0), 2},
{math.Nextafter32(-1.0/16.0, 0), 2},
{math.Nextafter32(1.0/256.0, 0), 4},
{math.Nextafter32(-1.0/256.0, 0), 4},
{math.SmallestNonzeroFloat32, 74},
{-math.SmallestNonzeroFloat32, 74},
{inf, 0},
{-inf, 0},
}
for _, c := range cases {
got := MipmapLevelForDownscale(c.In)
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want := c.Out
if got != want {
t.Errorf("MipmapLevel(%v): got %v, want %v", c.In, got, want)
}
}
}