package opengl import ( "github.com/hajimehoshi/go-ebiten/graphics" "github.com/hajimehoshi/go-ebiten/graphics/opengl/rendertarget" "github.com/hajimehoshi/go-ebiten/graphics/opengl/texture" gtexture "github.com/hajimehoshi/go-ebiten/graphics/texture" "image" "sync" ) type ids struct { lock sync.RWMutex textures map[graphics.TextureId]*gtexture.Texture renderTargets map[graphics.RenderTargetId]*gtexture.RenderTarget renderTargetToTexture map[graphics.RenderTargetId]graphics.TextureId counts chan int } func newIds() *ids { ids := &ids{ textures: map[graphics.TextureId]*gtexture.Texture{}, renderTargets: map[graphics.RenderTargetId]*gtexture.RenderTarget{}, renderTargetToTexture: map[graphics.RenderTargetId]graphics.TextureId{}, counts: make(chan int), } go func() { for i := 1; ; i++ { ids.counts <- i } }() return ids } func (i *ids) TextureAt(id graphics.TextureId) *gtexture.Texture { i.lock.RLock() defer i.lock.RUnlock() return i.textures[id] } func (i *ids) RenderTargetAt(id graphics.RenderTargetId) *gtexture.RenderTarget { i.lock.RLock() defer i.lock.RUnlock() return i.renderTargets[id] } func (i *ids) ToTexture(id graphics.RenderTargetId) graphics.TextureId { i.lock.RLock() defer i.lock.RUnlock() return i.renderTargetToTexture[id] } func (i *ids) CreateTexture(img image.Image, filter graphics.Filter) ( graphics.TextureId, error) { texture, err := texture.CreateFromImage(img, filter) if err != nil { return 0, err } textureId := graphics.TextureId(<-i.counts) i.lock.Lock() defer i.lock.Unlock() i.textures[textureId] = texture return textureId, nil } func (i *ids) CreateRenderTarget(width, height int, filter graphics.Filter) ( graphics.RenderTargetId, error) { renderTarget, texture, err := rendertarget.Create(width, height, filter) if err != nil { return 0, err } renderTargetId := graphics.RenderTargetId(<-i.counts) textureId := graphics.TextureId(<-i.counts) i.lock.Lock() defer i.lock.Unlock() i.renderTargets[renderTargetId] = renderTarget i.textures[textureId] = texture i.renderTargetToTexture[renderTargetId] = textureId return renderTargetId, nil }