mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// 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 affine
|
|
|
|
import (
|
|
"github.com/hajimehoshi/ebiten/internal/endian"
|
|
)
|
|
|
|
var identityValues = map[int]string{
|
|
ColorMDim: colorMValueString([ColorMDim - 1][ColorMDim]float64{
|
|
{1, 0, 0, 0, 0},
|
|
{0, 1, 0, 0, 0},
|
|
{0, 0, 1, 0, 0},
|
|
{0, 0, 0, 1, 0},
|
|
}),
|
|
GeoMDim: geoMValueString([GeoMDim - 1][GeoMDim]float64{
|
|
{1, 0, 0},
|
|
{0, 1, 0},
|
|
}),
|
|
}
|
|
|
|
func uint64ToBytes(value uint64) []uint8 {
|
|
result := make([]uint8, 8)
|
|
if endian.IsLittle() {
|
|
for i := 0; i < 8; i++ {
|
|
result[i] = uint8(value)
|
|
value >>= 8
|
|
}
|
|
} else {
|
|
for i := 7; 0 <= i; i-- {
|
|
result[i] = uint8(value)
|
|
value >>= 8
|
|
}
|
|
}
|
|
return result
|
|
}
|
|
|
|
type affine interface {
|
|
dim() int
|
|
Element(i, j int) float64
|
|
SetElement(i, j int, element float64)
|
|
}
|
|
|
|
// add is deprecated
|
|
func add(lhs, rhs, result affine) {
|
|
dim := lhs.dim()
|
|
if dim != rhs.dim() {
|
|
panic("ebiten: different-sized matrices can't be multiplied")
|
|
}
|
|
|
|
for i := 0; i < dim-1; i++ {
|
|
for j := 0; j < dim; j++ {
|
|
v := lhs.Element(i, j) + rhs.Element(i, j)
|
|
result.SetElement(i, j, v)
|
|
}
|
|
}
|
|
}
|
|
|
|
func mul(lhs, rhs, result affine) {
|
|
dim := lhs.dim()
|
|
if dim != rhs.dim() {
|
|
panic("ebiten: different-sized matrices can't be multiplied")
|
|
}
|
|
|
|
for i := 0; i < dim-1; i++ {
|
|
for j := 0; j < dim; j++ {
|
|
element := float64(0)
|
|
for k := 0; k < dim-1; k++ {
|
|
element += lhs.Element(i, k) *
|
|
rhs.Element(k, j)
|
|
}
|
|
if j == dim-1 {
|
|
element += lhs.Element(i, j)
|
|
}
|
|
result.SetElement(i, j, element)
|
|
}
|
|
}
|
|
}
|