Added rgb function

lib/minifb/src/minifb.zig

@@ -5,6 +5,10 @@ const minifb_c = @cImport({
 });
 const testing = std.testing;
 
+pub fn rgb(r: u8, g: u8, b: u8) u32 {
+    return @intCast(u32, r) << 16 | @intCast(u32, g) << 8 | b;
+}
+
 pub const Window = struct{
     cwin: *minifb_c.mfb_window,
 
@@ -41,5 +45,5 @@ pub const Window = struct{
         }
     }
 
-    
+
 };

src/main.zig

@@ -5,12 +5,16 @@ const minifb = @import("minifb");
 const Width = 800;
 const Height = 600;
 
+fn grey(value: u8) u32 {
+    return minifb.rgb(value, value, value);
+}
+
 pub fn main() anyerror!void {
     std.log.info("All your codebase are belong to us.", .{});
     var win = minifb.Window.open("Hello minifb-zig", Width, Height) catch unreachable;
 
-    var color: u32 = 0xff000000;
-    const deltaColor: u32 = 0x00010101;
+    var color: u32 = grey(0);
+    const deltaColor = grey(1);
     var increasing = true;
     var rawBuffer: [Width*Height]u32 = undefined;
     const buffer = rawBuffer[0..rawBuffer.len];
@@ -18,13 +22,13 @@ pub fn main() anyerror!void {
 
     while (win.waitSync()) {
         if (increasing) {
-            if (color < 0xffffffff) {
+            if (color < grey(255)) {
                 color += deltaColor;
             } else {
                 increasing = false;
             }
         } else {
-            if (color > 0xff000000) {
+            if (color > grey(0)) {
                 color -= deltaColor;
             } else {
                 increasing = true;
@@ -33,7 +37,7 @@ pub fn main() anyerror!void {
         std.mem.set(u32, buffer, color);
         var i: u32 = 0;
         while (i < Width) {
-            buffer[i] = 0xffff0000;
+            buffer[i] = minifb.rgb(255,0,0);
             i += 1;
         }
         _ = win.update(buffer) catch unreachable;