--- a/GNUmakefile	Mon Oct 10 12:34:31 2022 +0200
+++ b/GNUmakefile	Wed Oct 12 15:06:18 2022 +0200
@@ -223,6 +223,7 @@
                         src/libmlk-core/core/core.c \
                         src/libmlk-core/core/drawable-stack.c \
                         src/libmlk-core/core/drawable.c \
+                        src/libmlk-core/core/err.c \
                         src/libmlk-core/core/error.c \
                         src/libmlk-core/core/event.c \
                         src/libmlk-core/core/font.c \

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libmlk-core/core/err.c	Wed Oct 12 15:06:18 2022 +0200
@@ -0,0 +1,36 @@
+/*
+ * err.h -- error routines
+ *
+ * Copyright (c) 2020-2022 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <SDL.h>
+
+#include "err.h"
+
+const char *
+mlk_err_string(enum mlk_err e)
+{
+	switch (e) {
+	case MLK_ERR_INTERNAL:
+		return SDL_GetError();
+	case MLK_ERR_NO_MEM:
+		return "out of memory";
+	case MLK_ERR_NO_SUPPORT:
+		return "operation not supported";
+	default:
+		return "no error";
+	}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libmlk-core/core/err.h	Wed Oct 12 15:06:18 2022 +0200
@@ -0,0 +1,32 @@
+/*
+ * err.h -- error handing
+ *
+ * Copyright (c) 2020-2022 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef MLK_ERR_H
+#define MLK_ERR_H
+
+enum mlk_err {
+	MLK_ERR_NONE,
+	MLK_ERR_INTERNAL        = -1,
+	MLK_ERR_NO_MEM          = -2,
+	MLK_ERR_NO_SUPPORT      = -3
+};
+
+const char *
+mlk_err_string(enum mlk_err);
+
+#endif /* !MLK_ERROR_H */

--- a/src/libmlk-core/core/texture.c	Mon Oct 10 12:34:31 2022 +0200
+++ b/src/libmlk-core/core/texture.c	Wed Oct 12 15:06:18 2022 +0200
@@ -27,17 +27,19 @@
 #include "window.h"
 #include "window_p.h"
 
-int
+enum mlk_err
 texture_new(struct texture *tex, unsigned int w, unsigned int h)
 {
 	assert(tex);
+	assert(w);
+	assert(h);
 
 	tex->handle = SDL_CreateTexture(RENDERER(),
 	    SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h);
 
 	if (!tex->handle) {
 		tex->w = tex->h = 0;
-		return errorf("%s", SDL_GetError());
+		return MLK_ERR_INTERNAL;
 	}
 
 	tex->w = w;

--- a/src/libmlk-core/core/texture.h	Mon Oct 10 12:34:31 2022 +0200
+++ b/src/libmlk-core/core/texture.h	Wed Oct 12 15:06:18 2022 +0200
@@ -20,6 +20,7 @@
 #define MLK_CORE_TEXTURE_H
 
 #include "core.h"
+#include "err.h"
 
 struct texture {
 	unsigned int w;
@@ -37,7 +38,7 @@
 
 CORE_BEGIN_DECLS
 
-int
+enum mlk_err
 texture_new(struct texture *, unsigned int, unsigned int);
 
 int