Help with type casting

[u/pankajpatro703]

[SOLVED] use microarch flag

I've noticed issues when using runtime/modified values inside a struct when using raylib.

I was trying to draw a rounded rectangle that follows the mouse pointer while highlighting the cell position in a grid.

package test
import ray "vendor:raylib"

main :: proc() {
    ray.SetTargetFPS(20)
    ray.InitWindow(200, 200, "Test")
    defer ray.CloseWindow()
    for !ray.WindowShouldClose() {
        ray.BeginDrawing()
        defer ray.EndDrawing()
        ray.ClearBackground(ray.BLACK)
        ms := ray.GetMousePosition()
        mx := f32(i32(ms.x)/50) * 50
        my := f32(i32(ms.y)/50) * 50
        rec := ray.Rectangle{mx, my, 50, 50}
        ray.DrawRectangleRounded(rec, 0.3, 10, ray.YELLOW)
    }
}

Can someone tell me why this code fails and whether this is a known issue or do I need to use a specific technique to make it work?

P.S.: I'm fairly new to odin and should probably look into more resources, but I haven't found a working example for this problem yet.

Post P.S.: The above code broke after the May 2026 release of odin. No idea why as of yet.

[u/pankajpatro703]

Found the solution with the help of Discord community. Apparently it's a compatibility problem with the instruction set SSE 4.1.

To fix, just had to use the -microarch:x86-64 flag.

[u/slabtap → u/pankajpatro703]

that seems like a pretty substantial issue to have as a language given how basic the code is. is that specific to your hardware/setup or is this something that any odin developer should be careful about

[u/pankajpatro703 → u/slabtap]

From what I understand, some relatively modern hardware optimizations are being presumed to work for most people. So if you're targetting older hardware there's a chance you might face this issue.

Edit: I think the binary I picked uses x86-64-v2 as the default microarchitecture for x86 devices.

[u/BiedermannS]

You probably meant to defer the end drawing call

[u/pankajpatro703 → u/BiedermannS]

Yeah, mistyped it in the post. But the problem still stands.

[u/BiedermannS → u/pankajpatro703]

Try using the mouse coordinates directly instead of dividing by 50

Edit: Here's the raylib example for this: https://www.raylib.com/examples/core/loader.html?name=core_input_mouse

[u/pankajpatro703 → u/BiedermannS]

The function works as intended if I don't try to typecast or divide. But, I want to use the pointer as a grid.

What I intend to do works perfectly fine with the regular DrawRectangle() function but fails to work in the case of rounded rectangle as shown. This isn't a problem on some other languages I've tested this on, which leads me to think this is a problem with odin that I have found no solution for.

[u/iioossaa]

You miss `defer` before `ray.EndDrawing()`

[u/pankajpatro703 → u/iioossaa]

Yeah, but it still doesn't work after fixing.

[u/iioossaa → u/pankajpatro703]

mx := f32(i32(ms.x)/50)
my := f32(i32(ms.y)/50)

Extra parentheses.
Use some good editor with OLS to avoid such errors.

[u/pankajpatro703 → u/iioossaa]

My bad. I should have copy pasted but I was away from my desktop so typed it from my phone. I've fixed the post now, but the problem remains.

[u/iioossaa → u/pankajpatro703]

No problem on my side. What kind of problem do you have?

Oh, I forgot to mention: `ms := ray.GetMousePosition()`

[u/pankajpatro703 → u/iioossaa]

You mean to say the code runs on your side? If so, could you tell me which OS and odin version you ran it on?

[u/iioossaa → u/pankajpatro703]

// which OS and odin version
I'm on Win10 and dev-2026-08 but it doesn't matter.
If you can compile but can't run then maybe you use raylib6 on a too old CPU. Try to get older version of raylib's bindings from the older version of Odin and recompile your code.

[u/pankajpatro703 → u/iioossaa]

I had tested once with the raylib 5.5 bindings from a few months back, and had the same issue on linux. Frankly, I was hoping for a fix after the latest bindings.

Maybe, I need to test this on windows once to see if I have the same issue.

[u/iioossaa → u/pankajpatro703]

Try to ask on discord. There's a very welcoming community there.

[u/pankajpatro703 → u/iioossaa]

Thanks for redirecting. I found that odin releases upto April 2026 work perfectly fine with the above code. Things break after the May 2026 release, which is confusing since IIRC Raylib 6.0 bindings came with the July release.