---
name: "SDL_RectsEqualEpsilon"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_RectsEqualEpsilon"
---

# SDL\_RectsEqualEpsilon(3)

Determine whether two floating point rectangles are equal, within some given epsilon.

## NAME

SDL\_RectsEqualEpsilon - Determine whether two floating point rectangles are equal, within some given epsilon.

## HEADER FILE

Defined in SDL3/SDL\_rect.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**SDL\_FORCE\_INLINE bool SDL\_RectsEqualEpsilon(const SDL\_FRect \*a, const SDL\_FRect \*b, float epsilon);**

## DESCRIPTION

Rectangles are considered equal if both are not NULL and each of their x, y, width and height are within **epsilon** of each other. If you don't know what value to use for **epsilon** , you should call the

**SDL\_RectsEqualFloat**\
  function instead.

Note that this is a forced-inline function in a header, and not a public API function available in the SDL library (which is to say, the code is embedded in the calling program and the linker and dynamic loader will not be able to find this function inside SDL itself).

## FUNCTION PARAMETERS

- *a*

  the first rectangle to test.

- *b*

  the second rectangle to test.

- *epsilon*

  the epsilon value for comparison.

## RETURN VALUE

Returns true if the rectangles are equal, false otherwise.

## THREAD SAFETY

It is safe to call this function from any thread.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_RectsEqualFloat**(3)](/SDL_RectsEqualFloat/3.md)