package main

import (
    "github.com/veandco/go-sdl2/sdl"
)

func main() {
    alive := true
    window, _ := sdl.CreateWindow("test", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, 200, 200, sdl.WINDOW_SHOWN)
    renderer, _ := sdl.CreateRenderer(window, -1, sdl.RENDERER_PRESENTVSYNC|sdl.RENDERER_TARGETTEXTURE|sdl.RENDERER_ACCELERATED)

    renderer.SetDrawColor(80, 80, 80, 255)
    renderer.Clear()

    for alive {

        // create some texture
        texture, _ := renderer.CreateTexture(sdl.PIXELFORMAT_RGBA8888, sdl.TEXTUREACCESS_TARGET, 100, 100)

        renderer.SetRenderTarget(texture)                        // Set texture as target
        renderer.SetDrawColor(0xDD, 0x88, 0x33, 0xFF)            //
        renderer.Clear()                                         // Set some orange as background
        renderer.SetDrawColor(0x33, 0x88, 0xFF, 0xFF)            //
        renderer.FillRect(&sdl.Rect{X: 10, Y: 10, W: 80, H: 80}) // Draw some blue rect on it

        renderer.SetRenderTarget(nil)                                        // Reset rendertarget to window
        renderer.Copy(texture, nil, &sdl.Rect{X: 50, Y: 50, W: 100, H: 100}) // draw texture on window

        //texture.Destroy()  // when to destroy the texture ?
        renderer.Present() // neither of this works. If I delete the texture (even AFTER .Present)
        //texture.Destroy()  // it wont work right and the blue rect disappears. The .Clear orange color stays though...

        for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
            switch event.GetType() {
            case sdl.QUIT:
                alive = false
            }
        }

    }

    renderer.Destroy()
    window.Destroy()

}