package texture // #cgo LDFLAGS: -framework OpenGL // // #include import "C" import ( gtexture "github.com/hajimehoshi/go-ebiten/graphics/texture" "image" "unsafe" ) type Native C.GLuint type Filter int const ( FilterLinear Filter = iota FilterNearest ) func createNativeTexture(textureWidth, textureHeight int, pixels []uint8, filter Filter) Native { nativeTexture := C.GLuint(0) C.glGenTextures(1, (*C.GLuint)(&nativeTexture)) if nativeTexture < 0 { panic("glGenTexture failed") } C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, 4) C.glBindTexture(C.GL_TEXTURE_2D, C.GLuint(nativeTexture)) defer C.glBindTexture(C.GL_TEXTURE_2D, 0) glFilter := C.GLint(0) switch filter { case FilterLinear: glFilter = C.GL_LINEAR case FilterNearest: glFilter = C.GL_NEAREST default: panic("not reached") } C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, glFilter) C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, glFilter) ptr := unsafe.Pointer(nil) if pixels != nil { ptr = unsafe.Pointer(&pixels[0]) } C.glTexImage2D(C.GL_TEXTURE_2D, 0, C.GL_RGBA, C.GLsizei(textureWidth), C.GLsizei(textureHeight), 0, C.GL_RGBA, C.GL_UNSIGNED_BYTE, ptr) return Native(nativeTexture) } func create(textureWidth, textureHeight int, filter Filter) ( interface{}, error) { return createNativeTexture(textureWidth, textureHeight, nil, filter), nil } func createFromImage(img *image.NRGBA) (interface{}, error) { size := img.Bounds().Size() return createNativeTexture(size.X, size.Y, img.Pix, FilterLinear), nil } func Create(width, height int, filter Filter) (*gtexture.Texture, error) { native, err := create(gtexture.AdjustSize(width), gtexture.AdjustSize(height), filter) if err != nil { return nil, err } return gtexture.New(native, width, height), nil } func CreateFromImage(img image.Image) (*gtexture.Texture, error) { native, err := createFromImage(gtexture.AdjustImage(img)) if err != nil { return nil, err } size := img.Bounds().Size() return gtexture.New(native, size.X, size.Y), nil }