ui: Add xemu custom widget rendering

ui/xemu-custom-widgets.h

@@ -0,0 +1,45 @@
+/*
+ * xemu User Interface Rendering Helpers
+ *
+ * Copyright (C) 2020 Matt Borgerson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef XEMU_CUSTOM_WIDGETS
+#define XEMU_CUSTOM_WIDGETS
+
+#include <stdint.h>
+#include "xemu-input.h"
+#include "xemu-shaders.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// FIXME: Cleanup
+extern struct fbo *controller_fbo;
+extern struct fbo *logo_fbo;
+
+void initialize_custom_ui_rendering(void);
+void render_meter(struct decal_shader *s, float x, float y, float width, float height, float p, uint32_t color_bg, uint32_t color_fg);
+void render_controller(float frame_x, float frame_y, uint32_t primary_color, uint32_t secondary_color, struct controller_state *state);
+void render_controller_port(float frame_x, float frame_y, int i, uint32_t port_color);
+void render_logo(uint32_t primary_color, uint32_t secondary_color, uint32_t fill_color);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif