// blitScreen swaps the buffers and clears the screen
func (window *Screen) blitScreen() {
C.SDL_GL_SwapWindow(window.sdlWindow)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
window.elapsedTime = time.Since(window.frameTime).Seconds()
window.frameTime = time.Now()
}
// New returns a newly created Screen
func New(width int, height int, fullscreen bool, FSAA int, name string) *Screen {
window := &Screen{}
C.SDL_Init(C.SDL_INIT_VIDEO)
C.setGlContextAttributes()
C.SDL_GL_SetAttribute(C.SDL_GL_DOUBLEBUFFER, 1)
// Force hardware accel
C.SDL_GL_SetAttribute(C.SDL_GL_ACCELERATED_VISUAL, 1)
if FSAA > 0 {
// FSAA (Fullscreen antialiasing)
C.SDL_GL_SetAttribute(C.SDL_GL_MULTISAMPLEBUFFERS, 1)
C.SDL_GL_SetAttribute(C.SDL_GL_MULTISAMPLESAMPLES, C.int(FSAA)) // 2, 4, 8
}
flags := C.SDL_WINDOW_OPENGL | C.SDL_RENDERER_ACCELERATED
if fullscreen {
flags = flags | C.SDL_WINDOW_FULLSCREEN
}
C.SDL_CreateWindowAndRenderer(C.int(width), C.int(height), C.Uint32(flags), &window.sdlWindow, &window.renderer)
C.SDL_SetWindowTitle(window.sdlWindow, C.CString(name))
C.SDL_GL_CreateContext(window.sdlWindow)
if err := gl.Init(); err != nil {
panic(err)
}
version := gl.GoStr(gl.GetString(gl.VERSION))
fmt.Println("OpenGL version", version)
// Configure global settings
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
window.Width = width
window.Height = height
window.name = name
window.shouldClose = false
C.SDL_GL_SwapWindow(window.sdlWindow)
window.startTime = time.Now()
window.frameTime = time.Now()
C.SDL_GL_SetSwapInterval(1)
window.vsync = true
return window
}
// Swaps OpenGL framebuffers/Update Display.
func (w *Window) GL_SwapWindow() {
C.SDL_GL_SwapWindow(w.cWindow)
}
func GL_SwapWindow(_win *Window) {
C.SDL_GL_SwapWindow(_win.window)
}
func GL_SwapWindow(window *Window) {
_window := (*C.SDL_Window)(unsafe.Pointer(window))
C.SDL_GL_SwapWindow(_window)
}
func (win *Window) GL_Swap() {
C.SDL_GL_SwapWindow(win.c)
}
// GL_SwapWindow (https://wiki.libsdl.org/SDL_GL_SwapWindow)
func GL_SwapWindow(window *Window) {
C.SDL_GL_SwapWindow(window.cptr())
}
func Flip() {
C.SDL_GL_SwapWindow(win)
}
// Swaps OpenGL framebuffers/Update Display.
func (w *Window) GL_SwapWindow() {
GlobalMutex.Lock()
C.SDL_GL_SwapWindow(w.cWindow)
GlobalMutex.Unlock()
}