mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
117 lines
2.7 KiB
Go
117 lines
2.7 KiB
Go
package texture
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import (
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"github.com/hajimehoshi/go-ebiten/graphics"
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"image"
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"image/draw"
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)
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func nextPowerOf2(x uint64) uint64 {
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x -= 1
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x |= (x >> 1)
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x |= (x >> 2)
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x |= (x >> 4)
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x |= (x >> 8)
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x |= (x >> 16)
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x |= (x >> 32)
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return x + 1
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}
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type Texture struct {
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native interface{}
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width int
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height int
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}
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func AdjustSize(size int) int {
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return int(nextPowerOf2(uint64(size)))
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}
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func AdjustImage(img image.Image) *image.NRGBA {
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width, height := img.Bounds().Size().X, img.Bounds().Size().Y
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adjustedImageBounds := image.Rectangle{
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image.ZP,
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image.Point{
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AdjustSize(width),
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AdjustSize(height),
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},
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}
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if nrgba := img.(*image.NRGBA); nrgba != nil &&
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img.Bounds() == adjustedImageBounds {
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return nrgba
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}
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adjustedImage := image.NewNRGBA(adjustedImageBounds)
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dstBounds := image.Rectangle{
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image.ZP,
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img.Bounds().Size(),
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}
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draw.Draw(adjustedImage, dstBounds, img, image.ZP, draw.Src)
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return adjustedImage
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}
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func New(native interface{}, width, height int) *Texture {
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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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}
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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 {
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VertexX1 float32
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VertexX2 float32
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VertexY1 float32
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VertexY2 float32
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TextureCoordU1 float32
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TextureCoordU2 float32
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TextureCoordV1 float32
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TextureCoordV2 float32
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}
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type Drawable interface {
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Draw(native interface{}, quads []Quad)
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}
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func (texture *Texture) Draw(drawable Drawable) {
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x1 := float32(0)
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x2 := float32(texture.width)
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y1 := float32(0)
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y2 := float32(texture.height)
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u1 := texture.u(0)
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u2 := texture.u(texture.width)
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v1 := texture.v(0)
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v2 := texture.v(texture.height)
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quad := Quad{x1, x2, y1, y2, u1, u2, v1, v2}
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drawable.Draw(texture.native, []Quad{quad})
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}
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func (texture *Texture) DrawParts(parts []graphics.TexturePart, drawable Drawable) {
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quads := []Quad{}
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for _, part := range parts {
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x1 := float32(part.LocationX)
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x2 := float32(part.LocationX + part.Source.Width)
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y1 := float32(part.LocationY)
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y2 := float32(part.LocationY + part.Source.Height)
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u1 := texture.u(part.Source.X)
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u2 := texture.u(part.Source.X + part.Source.Width)
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v1 := texture.v(part.Source.Y)
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v2 := texture.v(part.Source.Y + part.Source.Height)
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quad := Quad{x1, x2, y1, y2, u1, u2, v1, v2}
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quads = append(quads, quad)
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}
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drawable.Draw(texture.native, quads)
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}
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type FramebufferCreator interface {
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Create(native interface{}) interface{}
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}
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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)
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}
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