package rendertarget // #cgo LDFLAGS: -framework OpenGL // // #include import "C" import ( "github.com/hajimehoshi/go-ebiten/graphics" "github.com/hajimehoshi/go-ebiten/graphics/opengl/texture" gtexture "github.com/hajimehoshi/go-ebiten/graphics/texture" ) type Framebuffer C.GLuint func createFramebuffer(nativeTexture C.GLuint) Framebuffer { framebuffer := C.GLuint(0) C.glGenFramebuffers(1, &framebuffer) origFramebuffer := C.GLint(0) C.glGetIntegerv(C.GL_FRAMEBUFFER_BINDING, &origFramebuffer) C.glBindFramebuffer(C.GL_FRAMEBUFFER, framebuffer) defer C.glBindFramebuffer(C.GL_FRAMEBUFFER, C.GLuint(origFramebuffer)) C.glFramebufferTexture2D(C.GL_FRAMEBUFFER, C.GL_COLOR_ATTACHMENT0, C.GL_TEXTURE_2D, nativeTexture, 0) if C.glCheckFramebufferStatus(C.GL_FRAMEBUFFER) != C.GL_FRAMEBUFFER_COMPLETE { panic("creating framebuffer failed") } // Set this framebuffer opaque because alpha values on a target might be // confusing. C.glClearColor(0, 0, 0, 1) C.glClear(C.GL_COLOR_BUFFER_BIT) return Framebuffer(framebuffer) } type framebufferCreator struct { } func (f *framebufferCreator) Create(native interface{}) interface{} { return createFramebuffer(C.GLuint(native.(texture.Native))) } func Create(width, height int, filter graphics.Filter) ( *gtexture.RenderTarget, *gtexture.Texture, error) { tex, err := texture.Create(width, height, filter) if err != nil { return nil, nil, err } return tex.CreateRenderTarget(&framebufferCreator{}), tex, nil } func CreateWithFramebuffer(width, height int, framebuffer Framebuffer) ( *gtexture.RenderTarget, error) { return gtexture.NewRenderTarget(framebuffer, width, height), nil }