Modify for SNES screen size

examples/glut/main.go

@@ -49,8 +49,8 @@ func main() {
 	cargc := C.int(len(cargs))
 
 	screenWidth  := 256
-	screenHeight := 256
-	screenScale  := 1
+	screenHeight := 240
+	screenScale  := 2
 
 	C.glutInit(&cargc, &cargs[0])
 	C.glutInitDisplayMode(C.GLUT_RGBA);

graphics/texture.go

@@ -32,12 +32,14 @@ type Texture struct {
 func createTexture(width, height int, pixels []uint8) *Texture{
 	textureWidth := int(Clp2(uint64(width)))
 	textureHeight := int(Clp2(uint64(height)))
+	if pixels != nil {
 		if width != textureWidth {
 			panic("sorry, but width should be power of 2")
 		}
 		if height != textureHeight {
 			panic("sorry, but height should be power of 2")
 		}
+	}
 	texture := &Texture{
 		id: 0,
 		Width: width,