swc

commit f5f7b0704c1f8f93c03bd09d449296f318817a3e
parent 6b9d93c8ffc1b7d09a4bdb6b23e245cabedcae33
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Thu, 13 May 2021 12:24:10 -0500

drm: use default render node if none exist for primary card

Diffstat:
M
libswc/drm.c
 | 
41
+++++++++++++++++++++++++++++++++++++++--

1 file changed, 39 insertions(+), 2 deletions(-)
diff --git a/libswc/drm.c b/libswc/drm.c
@@ -172,6 +172,37 @@ find_primary_drm_device(char *path, size_t size)
 	return true;
 }
 
+static int
+select_render_node(const struct dirent *entry)
+{
+	unsigned num;
+	return sscanf(entry->d_name, "renderD%u", &num) == 1;
+}
+
+static bool
+find_render_node(char *path, size_t size)
+{
+	struct dirent **nodes;
+	int num_nodes;
+	unsigned i;
+
+	num_nodes = scandir("/dev/dri", &nodes, &select_render_node, &alphasort);
+
+	if (num_nodes == -1)
+		return false;
+
+	if (snprintf(path, size, "/dev/dri/%s", nodes[0]->d_name) >= size)
+		return false;
+
+	for (i = 0; i < num_nodes; ++i) {
+		free(nodes[i]);
+	}
+
+	free(nodes);
+
+	return true;
+}
+
 static bool
 find_available_crtc(drmModeRes *resources, drmModeConnector *connector, uint32_t taken_crtcs, int *crtc_index)
 {
@@ -270,8 +301,14 @@ drm_initialize(void)
 
 	drm.path = drmGetRenderDeviceNameFromFd(swc.drm->fd);
 	if (!drm.path) {
-		ERROR("Could not determine render node path\n");
-		goto error1;
+		if (!find_render_node(render, sizeof(render))) {
+			ERROR("Could not find default render node\n");
+			goto error1;
+		}
+		if (!(drm.path = strdup(render))) {
+			ERROR("Couldn't copy render node path\n");
+			goto error1;
+		}
 	}
 
 	if (!(swc.drm->context = wld_drm_create_context(swc.drm->fd))) {