mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
127 lines
2.9 KiB
Go
127 lines
2.9 KiB
Go
// Copyright 2015 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 ebiten
|
|
|
|
import (
|
|
"fmt"
|
|
"image"
|
|
"math"
|
|
|
|
"github.com/hajimehoshi/ebiten/internal/graphics"
|
|
)
|
|
|
|
// Deprecated (as of 1.1.0-alpha): Use ImageParts instead.
|
|
type ImagePart struct {
|
|
Dst image.Rectangle
|
|
Src image.Rectangle
|
|
}
|
|
|
|
// An ImageParts represents the parts of the destination image and the parts of the source image.
|
|
type ImageParts interface {
|
|
Len() int
|
|
Dst(i int) (x0, y0, x1, y1 int)
|
|
Src(i int) (x0, y0, x1, y1 int)
|
|
}
|
|
|
|
// NOTE: Remove this in the future.
|
|
type imageParts []ImagePart
|
|
|
|
func (p imageParts) Len() int {
|
|
return len(p)
|
|
}
|
|
|
|
func (p imageParts) Dst(i int) (x0, y0, x1, y1 int) {
|
|
dst := &p[i].Dst
|
|
return dst.Min.X, dst.Min.Y, dst.Max.X, dst.Max.Y
|
|
}
|
|
|
|
func (p imageParts) Src(i int) (x0, y0, x1, y1 int) {
|
|
src := &p[i].Src
|
|
return src.Min.X, src.Min.Y, src.Max.X, src.Max.Y
|
|
}
|
|
|
|
type wholeImage struct {
|
|
width int
|
|
height int
|
|
}
|
|
|
|
func (w *wholeImage) Len() int {
|
|
return 1
|
|
}
|
|
|
|
func (w *wholeImage) Dst(i int) (x0, y0, x1, y1 int) {
|
|
return 0, 0, w.width, w.height
|
|
}
|
|
|
|
func (w *wholeImage) Src(i int) (x0, y0, x1, y1 int) {
|
|
return 0, 0, w.width, w.height
|
|
}
|
|
|
|
func u(x, width2p int) int16 {
|
|
return int16(math.MaxInt16 * x / width2p)
|
|
}
|
|
|
|
func v(y, height2p int) int16 {
|
|
return int16(math.MaxInt16 * y / height2p)
|
|
}
|
|
|
|
type textureQuads struct {
|
|
parts ImageParts
|
|
width int
|
|
height int
|
|
}
|
|
|
|
func (t *textureQuads) vertices(vertices []int16) int {
|
|
l := t.parts.Len()
|
|
if len(vertices) < l*16 {
|
|
panic(fmt.Sprintf("ebiten: vertices size must be greater than %d but %d", l*16, len(vertices)))
|
|
}
|
|
p := t.parts
|
|
w, h := t.width, t.height
|
|
n := 0
|
|
width2p := int(graphics.NextPowerOf2Int32(int32(w)))
|
|
height2p := int(graphics.NextPowerOf2Int32(int32(h)))
|
|
for i := 0; i < l; i++ {
|
|
dx0, dy0, dx1, dy1 := p.Dst(i)
|
|
if dx0 == dx1 || dy0 == dy1 {
|
|
continue
|
|
}
|
|
x0, y0, x1, y1 := int16(dx0), int16(dy0), int16(dx1), int16(dy1)
|
|
sx0, sy0, sx1, sy1 := p.Src(i)
|
|
if sx0 == sx1 || sy0 == sy1 {
|
|
continue
|
|
}
|
|
u0, v0, u1, v1 := u(sx0, width2p), v(sy0, height2p), u(sx1, width2p), v(sy1, height2p)
|
|
vertices[16*n] = x0
|
|
vertices[16*n+1] = y0
|
|
vertices[16*n+2] = u0
|
|
vertices[16*n+3] = v0
|
|
vertices[16*n+4] = x1
|
|
vertices[16*n+5] = y0
|
|
vertices[16*n+6] = u1
|
|
vertices[16*n+7] = v0
|
|
vertices[16*n+8] = x0
|
|
vertices[16*n+9] = y1
|
|
vertices[16*n+10] = u0
|
|
vertices[16*n+11] = v1
|
|
vertices[16*n+12] = x1
|
|
vertices[16*n+13] = y1
|
|
vertices[16*n+14] = u1
|
|
vertices[16*n+15] = v1
|
|
n++
|
|
}
|
|
return n
|
|
}
|