Update example based on feedback in zig-gamedev/zgui#17.

Author: PMarcL

build.zig.zon

@@ -4,7 +4,7 @@
     .dependencies = .{
         .zgui = .{
             .url = "https://github.com/PMarcL/zgui/archive/refs/heads/sdl3gpu-backend.tar.gz",
-            .hash = "1220a2c6d3978249cb9d64905f36236bad95a1f97c2c5c89ec513fa6eb88518f6c5d",
+            .hash = "122052612a864529ee98c95d7efc55ccd3d3f214a52b9352e0c773473ba92b6b7901",
         },
     },
     .paths = .{

src/main.zig

@@ -81,11 +81,12 @@ pub fn main() !void {
 
         var fb_width: c_int = 0;
         var fb_height: c_int = 0;
-        if (!c.SDL_GetWindowSizeInPixels(window, &fb_width, &fb_height)) {
+        if (!c.SDL_GetWindowSize(window, &fb_width, &fb_height)) {
             std.log.err("SDL_GetWindowSizeInPixels failed: {s}\n", .{c.SDL_GetError()});
             return;
         }
-        zgui.backend.newFrame(@intCast(fb_width), @intCast(fb_height));
+        const fb_scale = c.SDL_GetWindowDisplayScale(window);
+        zgui.backend.newFrame(@intCast(fb_width), @intCast(fb_height), fb_scale);
 
         // Show a simple window
         zgui.setNextWindowPos(.{ .x = 20.0, .y = 20.0, .cond = .first_use_ever });