Initial UI instance implementation.

git-svn-id: http://svn.drobilla.net/lad/trunk/suil@3010 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 147 insertions, 0 deletions

diff --git a/src/instance.c b/src/instance.c
new file mode 100644
index 0000000..82ace11
--- /dev/null
+++ b/src/instance.c
@@ -0,0 +1,147 @@
+/* Suil, a lightweight RDF syntax library.
+ * Copyright 2011 David Robillard <d@drobilla.net>
+ *
+ * Suil is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Suil is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ * License for details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _XOPEN_SOURCE 500
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <dlfcn.h>
+
+#include "suil_internal.h"
+
+SUIL_API
+bool
+suil_ui_type_supported(const char* uri)
+{
+	return !strcmp(uri, "http://lv2plug.in/ns/extensions/ui#GtkUI");
+}
+
+SUIL_API
+SuilInstance
+suil_instance_new(SuilUIs                   uis,
+                  const char*               type_uri,
+                  const char*               ui_uri,
+                  LV2UI_Write_Function      write_function,
+                  LV2UI_Controller          controller,
+                  const LV2_Feature* const* features)
+{
+	struct _SuilInstance* instance = NULL;
+
+	const bool local_features = (features == NULL);
+	if (local_features) {
+		features = malloc(sizeof(LV2_Feature));
+		((LV2_Feature**)features)[0] = NULL;
+	}
+
+	SuilUI ui = uis->uis[0];  // FIXME
+
+	dlerror();
+	void* lib = dlopen(ui->binary_path, RTLD_NOW);
+	if (!lib) {
+		SUIL_ERRORF("Unable to open UI library %s (%s)\n",
+		            ui->binary_path, dlerror());
+		return NULL;
+	}
+
+	LV2UI_DescriptorFunction df = (LV2UI_DescriptorFunction)
+		suil_dlfunc(lib, "lv2ui_descriptor");
+
+	if (!df) {
+		SUIL_ERRORF("Broken LV2 UI %s (no lv2ui_descriptor symbol found)\n",
+		            ui->binary_path);
+		dlclose(lib);
+		return NULL;
+	} else {
+		for (uint32_t i = 0; true; ++i) {
+			const LV2UI_Descriptor* ld = df(i);
+			if (!ld) {
+				SUIL_ERRORF("No UI %s in %s\n", ui->uri, ui->binary_path);
+				dlclose(lib);
+				break;  // return NULL
+			} else if ((ui_uri && !strcmp(ld->URI, ui_uri))
+			           || !strcmp(ui->type_uri, type_uri)) {
+				instance             = malloc(sizeof(struct _SuilInstance));
+				instance->descriptor = ld;
+				instance->handle     = ld->instantiate(
+					ld,
+					uis->plugin_uri,
+					ui->bundle_path,
+					write_function,
+					controller,
+					&instance->widget,
+					features);
+				instance->lib_handle = lib;
+				break;
+			}
+		}
+	}
+
+	if (local_features) {
+		free((LV2_Feature**)features);
+	}
+
+	// Failed to find or instantiate UI
+	if (!instance || !instance->handle) {
+		free(instance);
+		return NULL;
+	}
+
+	// Failed to create a widget, but still got a handle (buggy UI)
+	if (!instance->widget) {
+		suil_instance_free(instance);
+		return NULL;
+	}
+
+	return instance;
+}
+
+SUIL_API
+void
+suil_instance_free(SuilInstance instance)
+{
+	if (instance) {
+		instance->descriptor->cleanup(instance->handle);
+		dlclose(instance->lib_handle);
+		free(instance);
+	}
+}
+
+SUIL_API
+LV2UI_Widget
+suil_instance_get_widget(SuilInstance instance)
+{
+	return instance->widget;
+}
+
+SUIL_API
+void
+suil_instance_port_event(SuilInstance instance,
+                         uint32_t     port_index,
+                         uint32_t     buffer_size,
+                         uint32_t     format,
+                         const void*  buffer)
+{
+	instance->descriptor->port_event(instance->handle,
+	                                 port_index,
+	                                 buffer_size,
+	                                 format,
+	                                 buffer);
+}