ebiten/internal/affine/affine_notjs.go

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// Copyright 2017 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.
// +build !js
package affine
import (
"math"
"github.com/hajimehoshi/ebiten/internal/endian"
)
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func elements(values string, dim int) []float64 {
result := make([]float64, dim*(dim-1))
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if values == "" {
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for i := 0; i < dim-1; i++ {
result[i*dim+i] = 1
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}
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return result
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}
if endian.IsLittle() {
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for i := 0; i < len(values)/8; i++ {
v := uint64(0)
for k := 7; 0 <= k; k-- {
v <<= 8
v += uint64(values[i*8+k])
}
result[i] = math.Float64frombits(v)
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}
} else {
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for i := 0; i < len(values)/8; i++ {
v := uint64(0)
for k := 0; k < 8; k++ {
v <<= 8
v += uint64(values[i*8+k])
}
result[i] = math.Float64frombits(v)
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}
}
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return result
}
func setElements(values []float64, dim int) string {
result := make([]uint8, len(values)*8)
for i, v := range values {
copy(result[i*8:(i+1)*8], uint64ToBytes(math.Float64bits(v)))
}
return string(result)
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}
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func setElement(values string, dim int, i, j int, value float64) string {
if values == "" {
values = identityValues[dim]
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}
b := uint64ToBytes(math.Float64bits(value))
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offset := 8 * (i*dim + j)
return values[:offset] + string(b) + values[offset+8:]
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}