ebiten/graphics/texture/texture.go

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package texture
import (
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"github.com/hajimehoshi/go-ebiten/graphics"
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"image"
"image/draw"
)
func nextPowerOf2(x uint64) uint64 {
x -= 1
x |= (x >> 1)
x |= (x >> 2)
x |= (x >> 4)
x |= (x >> 8)
x |= (x >> 16)
x |= (x >> 32)
return x + 1
}
type Texture struct {
native interface{}
width int
height int
}
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func AdjustSize(size int) int {
return int(nextPowerOf2(uint64(size)))
}
func AdjustImage(img image.Image) *image.NRGBA {
width, height := img.Bounds().Size().X, img.Bounds().Size().Y
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adjustedImageBounds := image.Rectangle{
image.ZP,
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image.Point{
AdjustSize(width),
AdjustSize(height),
},
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}
if nrgba := img.(*image.NRGBA); nrgba != nil &&
img.Bounds() == adjustedImageBounds {
return nrgba
}
adjustedImage := image.NewNRGBA(adjustedImageBounds)
dstBounds := image.Rectangle{
image.ZP,
img.Bounds().Size(),
}
draw.Draw(adjustedImage, dstBounds, img, image.ZP, draw.Src)
return adjustedImage
}
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func New(native interface{}, width, height int) *Texture {
return &Texture{native, width, height}
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}
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func (texture *Texture) u(x int) float32 {
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return float32(x) / float32(AdjustSize(texture.width))
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}
func (texture *Texture) v(y int) float32 {
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return float32(y) / float32(AdjustSize(texture.height))
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}
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type Quad struct {
VertexX1 float32
VertexX2 float32
VertexY1 float32
VertexY2 float32
TextureCoordU1 float32
TextureCoordU2 float32
TextureCoordV1 float32
TextureCoordV2 float32
}
type Drawable interface {
Draw(native interface{}, quads []Quad)
}
func (texture *Texture) Draw(drawable Drawable) {
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x1 := float32(0)
x2 := float32(texture.width)
y1 := float32(0)
y2 := float32(texture.height)
u1 := texture.u(0)
u2 := texture.u(texture.width)
v1 := texture.v(0)
v2 := texture.v(texture.height)
quad := Quad{x1, x2, y1, y2, u1, u2, v1, v2}
drawable.Draw(texture.native, []Quad{quad})
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}
func (texture *Texture) DrawParts(parts []graphics.TexturePart, drawable Drawable) {
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quads := []Quad{}
for _, part := range parts {
x1 := float32(part.LocationX)
x2 := float32(part.LocationX + part.Source.Width)
y1 := float32(part.LocationY)
y2 := float32(part.LocationY + part.Source.Height)
u1 := texture.u(part.Source.X)
u2 := texture.u(part.Source.X + part.Source.Width)
v1 := texture.v(part.Source.Y)
v2 := texture.v(part.Source.Y + part.Source.Height)
quad := Quad{x1, x2, y1, y2, u1, u2, v1, v2}
quads = append(quads, quad)
}
drawable.Draw(texture.native, quads)
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}
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type FramebufferCreator interface {
Create(native interface{}) interface{}
}
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func (texture *Texture) CreateRenderTarget(creator FramebufferCreator) *RenderTarget {
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return NewRenderTarget(creator.Create(texture.native), texture.width, texture.height)
}