func createMainWindow() {
var err error
var mainWindow *sdl.Window
gc := gamecontext.GContext
gc.WindowWidth = 800
gc.WindowHeight = 600
mainWindow, err = sdl.CreateWindow("Eggdrop!", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, int(gc.WindowWidth), int(gc.WindowHeight), sdl.WINDOW_SHOWN)
if err != nil {
panic(err)
}
gc.MainSurface, err = mainWindow.GetSurface()
if err != nil {
panic(err)
}
gc.PixelFormatEnum, err = mainWindow.GetPixelFormat()
if err != nil {
panic(err)
}
gc.PixelFormat, err = sdl.AllocFormat(uint(gc.PixelFormatEnum)) // TODO why the cast? Seems to work?
if err != nil {
panic(err)
}
gc.MainWindow = mainWindow
}
// MakeFillSurfaceAlpha makes a new rectangular surface and fills with with RGBA
func MakeFillSurfaceAlpha(width, height int32, red, green, blue, alpha uint8) (*sdl.Surface, error) {
pf, err := sdl.AllocFormat(sdl.PIXELFORMAT_RGBA8888)
if err != nil {
return nil, err
}
color := sdl.MapRGBA(pf, red, green, blue, alpha)
surface, err := sdl.CreateRGBSurface(0, width, height, 32, pf.Rmask, pf.Gmask, pf.Bmask, pf.Amask)
if err != nil {
return nil, err
}
surface.FillRect(&sdl.Rect{X: 0, Y: 0, W: width, H: height}, color)
return surface, nil
}