lib: Introduce initial liboda sources

Please refer to 'share/docs/lib/liboda.md' for more information on the
OSMORA Display Architecture (ODA).

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/liboda/src/oda.c b/lib/liboda/src/oda.c
new file mode 100644
index 0000000..0eef523
--- /dev/null
+++ b/lib/liboda/src/oda.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/errno.h>
+#include <stdio.h>
+#include <libgfx/gfx.h>
+#include <liboda/oda.h>
+#include <liboda/odavar.h>
+
+#define oda_log(fmt, ...) printf("oda: " fmt, ##__VA_ARGS__)
+
+/*
+ * Initialize the OSMORA Display Architecture
+ * (ODA) library.
+ *
+ * @res: Initialized ODA state result
+ *
+ * Returns 0 on success, otherwise a less than
+ * zero value.
+ */
+int
+oda_init(struct oda_state *res)
+{
+    int error;
+
+    /* Ensure the argument is valid */
+    if (res == NULL) {
+        return -EINVAL;
+    }
+
+    /*
+     * If this state has already been initialized,
+     * assume programmer error / undefined behaviour
+     * and let them know.
+     */
+    if (oda_cookie_verify(res) == 0) {
+        oda_log("oda_init: 'res' already initialized\n");
+        return -EBUSY;
+    }
+
+    /* Initialize the graphics context */
+    error = gfx_init(&res->gctx);
+    if (error != 0) {
+        oda_log("oda_init: could not init graphics context\n");
+        return error;
+    }
+
+    TAILQ_INIT(&res->winq);
+    res->cookie = ODA_COOKIE;
+    return 0;
+}