mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
// Copyright 2016 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 ebiten
|
|
|
|
import (
|
|
"unsafe"
|
|
|
|
"github.com/hajimehoshi/ebiten/internal/endian"
|
|
"github.com/hajimehoshi/ebiten/internal/graphics"
|
|
)
|
|
|
|
func floatsToInt16s(xs ...float64) []int16 {
|
|
r := make([]int16, 0, len(xs)*2)
|
|
for _, x := range xs {
|
|
x32 := float32(x)
|
|
n := *(*uint32)(unsafe.Pointer(&x32))
|
|
if endian.IsLittle() {
|
|
r = append(r, int16(n), int16(n>>16))
|
|
} else {
|
|
r = append(r, int16(n>>16), int16(n))
|
|
}
|
|
}
|
|
return r
|
|
}
|
|
|
|
func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
|
|
// TODO: This function should be in graphics package?
|
|
totalSize := graphics.QuadVertexSizeInBytes() / 2
|
|
oneSize := totalSize / 4
|
|
l := parts.Len()
|
|
vs := make([]int16, l*totalSize)
|
|
width2p := graphics.NextPowerOf2Int(width)
|
|
height2p := graphics.NextPowerOf2Int(height)
|
|
n := 0
|
|
geo16 := floatsToInt16s(geo.Element(0, 0),
|
|
geo.Element(0, 1),
|
|
geo.Element(1, 0),
|
|
geo.Element(1, 1),
|
|
geo.Element(0, 2),
|
|
geo.Element(1, 2))
|
|
for i := 0; i < l; i++ {
|
|
dx0, dy0, dx1, dy1 := parts.Dst(i)
|
|
if dx0 == dx1 || dy0 == dy1 {
|
|
continue
|
|
}
|
|
x0, y0, x1, y1 := int16(dx0), int16(dy0), int16(dx1), int16(dy1)
|
|
sx0, sy0, sx1, sy1 := parts.Src(i)
|
|
if sx0 == sx1 || sy0 == sy1 {
|
|
continue
|
|
}
|
|
u0, v0, u1, v1 := u(sx0, width2p), v(sy0, height2p), u(sx1, width2p), v(sy1, height2p)
|
|
offset := n * totalSize
|
|
vs[offset] = x0
|
|
vs[offset+1] = y0
|
|
vs[offset+2] = u0
|
|
vs[offset+3] = v0
|
|
for j, g := range geo16 {
|
|
vs[offset+4+j] = g
|
|
}
|
|
vs[offset+oneSize] = x1
|
|
vs[offset+oneSize+1] = y0
|
|
vs[offset+oneSize+2] = u1
|
|
vs[offset+oneSize+3] = v0
|
|
for j, g := range geo16 {
|
|
vs[offset+oneSize+4+j] = g
|
|
}
|
|
vs[offset+2*oneSize] = x0
|
|
vs[offset+2*oneSize+1] = y1
|
|
vs[offset+2*oneSize+2] = u0
|
|
vs[offset+2*oneSize+3] = v1
|
|
for j, g := range geo16 {
|
|
vs[offset+2*oneSize+4+j] = g
|
|
}
|
|
vs[offset+3*oneSize] = x1
|
|
vs[offset+3*oneSize+1] = y1
|
|
vs[offset+3*oneSize+2] = u1
|
|
vs[offset+3*oneSize+3] = v1
|
|
for j, g := range geo16 {
|
|
vs[offset+3*oneSize+4+j] = g
|
|
}
|
|
n++
|
|
}
|
|
return vs[:n*totalSize]
|
|
}
|