add draw rect and new surface

gogame/surface/surface.go

@@ -1,10 +1,22 @@
 package surface
 
 import (
+	"fmt"
 	"github.com/veandco/go-sdl2/sdl"
+	"../color"
 )
 
 
+func Fill(surface *sdl.Surface, col color.Color) {
+
+	rect := sdl.Rect{0,0,0,0}
+
+	rect.W = surface.W
+	rect.H = surface.H
+
+	FillRect(surface, &rect, uint32(col.ToHex()))
+}
+
 func FillRect(surface *sdl.Surface,rect *sdl.Rect, color uint32) {
 	
 	sdl.Do(func() {
@@ -14,3 +26,21 @@ func FillRect(surface *sdl.Surface,rect *sdl.Rect, color uint32) {
 	return
 }
 
+// Create a New Surface
+func Surface(w,h int) *sdl.Surface {
+	//flags=0, depth=0, masks=None
+	Rmask := 0x000000ff
+	Gmask := 0x0000ff00
+	Bmask := 0x00ff0000
+	Amask := 0xff000000
+	
+	flags := 0
+	depth := 32
+	
+	surf,err := sdl.CreateRGBSurface(uint32(flags),int32(w),int32(h), int32(depth), uint32(Rmask), uint32(Gmask), uint32(Bmask), uint32(Amask))
+	if err != nil {
+		panic( fmt.Sprintf("sdl.CreateRGBSurface failed %s",sdl.GetError()))
+	}
+
+	return surf
+}