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https://github.com/hajimehoshi/ebiten.git
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b210339786
This is a hack to render edges correctly. This works only when the filter is nearest. Fixes #611
64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
// Copyright 2018 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ebiten_test
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import (
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"math"
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"testing"
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. "github.com/hajimehoshi/ebiten"
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)
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func TestMipmapLevelForDownscale(t *testing.T) {
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inf := float32(math.Inf(1))
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cases := []struct {
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In float32
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Out int
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}{
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{1, 0},
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{-1, 0},
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{2, 0},
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{-2, 0},
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{100, 0},
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{-100, 0},
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{1.0 / 2.0, 0},
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{-1.0 / 2.0, 0},
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{1.0 / 4.0, 0},
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{-1.0 / 4.0, 0},
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{math.Nextafter32(1.0/4.0, 0), 1},
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{math.Nextafter32(-1.0/4.0, 0), 1},
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{1.0 / 8.0, 1},
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{-1.0 / 8.0, 1},
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{1.0 / 16.0, 1},
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{-1.0 / 16.0, 1},
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{math.Nextafter32(1.0/16.0, 0), 2},
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{math.Nextafter32(-1.0/16.0, 0), 2},
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{math.Nextafter32(1.0/256.0, 0), 4},
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{math.Nextafter32(-1.0/256.0, 0), 4},
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{math.SmallestNonzeroFloat32, 74},
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{-math.SmallestNonzeroFloat32, 74},
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{inf, 0},
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{-inf, 0},
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}
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for _, c := range cases {
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got := MipmapLevelForDownscale(c.In)
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want := c.Out
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if got != want {
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t.Errorf("MipmapLevel(%v): got %v, want %v", c.In, got, want)
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}
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}
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}
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