func main() {
fmt.Println("OpenGL Test!!!")
// Init SDL
err := sdl.Init(sdl.INIT_VIDEO)
if err != nil {
fmt.Println("Init error:", err.Error())
Quit(1)
}
// Init OpenGL
sdl.GL_SetAttribute(sdl.GL_CONTEXT_MAJOR_VERSION, 3)
sdl.GL_SetAttribute(sdl.GL_CONTEXT_MINOR_VERSION, 3)
sdl.GL_SetAttribute(sdl.GL_DOUBLEBUFFER, 1)
sdl.GL_SetAttribute(sdl.GL_DEPTH_SIZE, 24)
// Create SDL Window
window, err := sdl.CreateWindow("OpenGL Test Nick", sdl.WINDOWPOS_CENTRED, sdl.WINDOWPOS_CENTRED, 512, 512, sdl.WINDOW_OPENGL|sdl.WINDOW_SHOWN)
if err != nil {
fmt.Println("Error while creating window:", err.Error())
Quit(2)
}
context := sdl.GL_CreateContext(window)
err = sdl.GL_SetSwapInterval(1)
if err != nil {
fmt.Println("Error while setting swap interval:", err.Error())
Quit(3)
}
//show red
gl.ClearColor(1.0, 0.0, 0.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
sdl.GL_SwapWindow(window)
sdl.Delay(2000)
//show green
gl.ClearColor(0.0, 1.0, 0.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
sdl.GL_SwapWindow(window)
sdl.Delay(2000)
//show blue
gl.ClearColor(0.0, 0.0, 1.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
sdl.GL_SwapWindow(window)
sdl.Delay(2000)
sdl.GL_DeleteContext(context)
sdl.DestroyWindow(window)
Quit(0)
}
//Game loop
func (game *Game) Run() {
defer game.Exit()
if game.initFun == nil {
fmt.Println("Go2D Warning: No init function set!")
}
if game.updateFun == nil {
fmt.Println("Go2D Warning: No update function set!")
}
if game.drawFun == nil {
fmt.Println("Go2D Warning: No draw function set!")
}
//Initialize the game
game.initialize()
var dt, old_t, now_t uint32 = 0, 0, 0
for g_running {
//Check for events and handle them
for {
event, present := sdl.PollEvent()
if present {
EventHandler(event)
} else {
break
}
}
//Calculate time delta
now_t = sdl.GetTicks()
dt = now_t - old_t
old_t = now_t
//Update
game.update(dt)
//Draw
game.draw()
//Give the CPU some time to do other stuff
sdl.Delay(1)
}
}