93 lines
1.6 KiB
Go
93 lines
1.6 KiB
Go
package sprite
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import (
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"fmt"
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"log"
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"github.com/veandco/go-sdl2/img"
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"github.com/veandco/go-sdl2/sdl"
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)
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type spritesheet struct {
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filename string
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renderer *sdl.Renderer
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surface *sdl.Surface // the original png file
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texture *sdl.Texture // the SDL texture created from the image
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}
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func NewSprite(renderer *sdl.Renderer, filename string) (*spritesheet, error) {
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var err error
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// Load the surface file
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var surface *sdl.Surface
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sdl.Do(func() {
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surface, err = img.Load(filename)
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})
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if err != nil {
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err = fmt.Errorf("failed to load image: %w", err)
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return nil, err
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}
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// Create the sprite sheet texture from the image
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var texture *sdl.Texture
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sdl.Do(func() {
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texture, err = renderer.CreateTextureFromSurface(surface)
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})
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if err != nil {
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err = fmt.Errorf("failed to create texture: %w", err)
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return nil, err
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}
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s := spritesheet{
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filename: filename,
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renderer: renderer,
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surface: surface,
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texture: texture,
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}
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return &s, nil
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}
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func (s *spritesheet) Cleanup() {
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// Clean up image
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defer func() {
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if s.surface != nil {
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sdl.Do(func() {
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s.surface.Free()
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})
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}
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}()
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// Clean up spritesheet
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defer func() {
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if s.texture != nil {
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sdl.Do(func() {
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err := s.texture.Destroy()
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if err != nil {
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log.Printf("error destroying spritesheet %v: %v\n", s.filename, err)
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}
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})
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}
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}()
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}
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func (s *spritesheet) Draw(section *sdl.Rect, placement *sdl.Rect) error {
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var err error
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sdl.Do(func() {
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err = s.renderer.Copy(s.texture, section, placement)
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})
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if err != nil {
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return err
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}
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return nil
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}
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func (s *spritesheet) Bounds() *sdl.Point {
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p := sdl.Point{
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X: s.surface.W,
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Y: s.surface.H,
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}
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return &p
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}
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