A Simple Golang SDL example
First install golang, SDL and the golang SDL package. The following is for Ubuntu 12.04:
sudo apt-get install golang-go Install SDL libraries: sudo apt-get install libsdl1.2-dev sudo apt-get install libsdl-mixer* sudo apt-get install libsdl-image* sudo apt-get install libsdl-ttf* sudo go get -v github.com/0xe2-0x9a-0x9b/Go-SDL/...
Then create the following go program. This write random pixel data to the screen directly. If you save it to main.go you can execute it with:
go run main.go
Here’s the code (please note there’s probably a lot wrong with it, it’s my first go program):
package main
import (
"github.com/0xe2-0x9a-0x9b/Go-SDL/sdl"
"log"
"unsafe"
"math/rand"
)
func draw_point(x int32,y int32,value uint32,screen* sdl.Surface) {
var pix = uintptr(screen.Pixels);
pix += (uintptr)((y*screen.W)+x)*unsafe.Sizeof(value);
var pu = unsafe.Pointer(pix);
var pp *uint32;
pp = (*uint32)(pu);
*pp = value;
}
func main() {
var screen = sdl.SetVideoMode(640, 480, 32, sdl.RESIZABLE)
if screen == nil {
log.Fatal(sdl.GetError())
}
var n int32;
for n=0;n<1000000;n++ {
var y int32 =rand.Int31()%480;
var x int32 =rand.Int31()%640;
var value uint32 = rand.Uint32();
draw_point(x,y,value,screen);
screen.Flip();
}
}
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