//Internal initalization (executes when game starts)
func (game *Game) initialize() {
// Initialize SDL
err := sdl.Init(sdl.INIT_VIDEO)
if err != nil {
fmt.Println(err.Error())
}
//Create the window
game.window, err = sdl.CreateWindow(game.title, sdl.WINDOWPOS_CENTERED, sdl.WINDOWPOS_CENTERED, game.width, game.height, sdl.WINDOW_SHOWN|sdl.WINDOW_OPENGL)
if err != nil {
panic(fmt.Sprintf("Go2D Error: Creating window: %s", err.Error()))
}
//Create the renderer
//Find our available renderers
openglIndex := 0
d3dIndex := -1
numRenderers := sdl.GetNumRenderDrivers()
for i := 0; i < numRenderers; i++ {
rendererName := sdl.GetRenderDriverName(i)
if rendererName == "opengl" {
openglIndex = i
} else if rendererName == "direct3d" {
d3dIndex = i
}
}
//Default renderer is OpenGL
rendererIndex := openglIndex
//If we want to use Direct3D and we found it, use it
if game.d3d && d3dIndex != -1 {
rendererIndex = d3dIndex
}
var errString string
game.renderer, errString = sdl.CreateRenderer(game.window, rendererIndex)
if errString != "" {
panic(fmt.Sprintf("Go2D Error: Creating renderer: %s", errString))
}
//initialize font rendering
sdl.InitTTF()
//Call the user-defined init function
if game.initFun != nil {
game.initFun()
}
g_running = true
}
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)
}