mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
// Copyright 2017 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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// +build !js
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package affine
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import (
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"math"
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"github.com/hajimehoshi/ebiten/internal/endian"
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)
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func elements(values string, dim int) []float64 {
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result := make([]float64, dim*(dim-1))
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if values == "" {
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for i := 0; i < dim-1; i++ {
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result[i*dim+i] = 1
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}
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return result
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}
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if endian.IsLittle() {
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for i := 0; i < len(values)/8; i++ {
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v := uint64(0)
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for k := 7; 0 <= k; k-- {
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v <<= 8
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v += uint64(values[i*8+k])
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}
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result[i] = math.Float64frombits(v)
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}
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} else {
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for i := 0; i < len(values)/8; i++ {
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v := uint64(0)
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for k := 0; k < 8; k++ {
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v <<= 8
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v += uint64(values[i*8+k])
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}
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result[i] = math.Float64frombits(v)
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}
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}
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return result
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}
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func setElements(values []float64, dim int) string {
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result := make([]uint8, len(values)*8)
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for i, v := range values {
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copy(result[i*8:(i+1)*8], uint64ToBytes(math.Float64bits(v)))
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}
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return string(result)
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}
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func setElement(values string, dim int, i, j int, value float64) string {
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if values == "" {
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values = identityValues[dim]
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}
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b := uint64ToBytes(math.Float64bits(value))
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offset := 8 * (i*dim + j)
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return values[:offset] + string(b) + values[offset+8:]
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}
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