mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
// Copyright 2014 Hajime Hoshi
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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 affine
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import (
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"github.com/hajimehoshi/ebiten/internal/endian"
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)
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var identityValues = map[int]string{
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ColorMDim: colorMValueString([ColorMDim - 1][ColorMDim]float64{
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{1, 0, 0, 0, 0},
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{0, 1, 0, 0, 0},
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{0, 0, 1, 0, 0},
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{0, 0, 0, 1, 0},
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}),
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GeoMDim: geoMValueString([GeoMDim - 1][GeoMDim]float64{
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{1, 0, 0},
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{0, 1, 0},
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}),
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}
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func uint64ToBytes(value uint64) []uint8 {
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result := make([]uint8, 8)
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if endian.IsLittle() {
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for i := 0; i < 8; i++ {
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result[i] = uint8(value)
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value >>= 8
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}
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} else {
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for i := 7; 0 <= i; i-- {
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result[i] = uint8(value)
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value >>= 8
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}
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}
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return result
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}
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type affine interface {
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dim() int
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element(i, j int) float64
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SetElement(i, j int, element float64)
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}
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// add is deprecated
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func add(lhs, rhs, result affine) {
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dim := lhs.dim()
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if dim != rhs.dim() {
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panic("ebiten: different-sized matrices can't be multiplied")
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}
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for i := 0; i < dim-1; i++ {
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for j := 0; j < dim; j++ {
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v := lhs.element(i, j) + rhs.element(i, j)
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result.SetElement(i, j, v)
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}
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}
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}
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func mul(lhs, rhs, result affine) {
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dim := lhs.dim()
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if dim != rhs.dim() {
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panic("ebiten: different-sized matrices can't be multiplied")
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}
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for i := 0; i < dim-1; i++ {
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for j := 0; j < dim; j++ {
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element := float64(0)
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for k := 0; k < dim-1; k++ {
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element += lhs.element(i, k) *
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rhs.element(k, j)
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}
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if j == dim-1 {
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element += lhs.element(i, j)
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}
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result.SetElement(i, j, element)
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}
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}
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}
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