libobs: Add func to set display background color

This function sets the background color for a display

libobs/obs-display.c

@@ -41,6 +41,7 @@ bool obs_display_init(struct obs_display *display,
 		return false;
 	}
 
+	display->background_color = 0x4C4C4C;
 	display->enabled = true;
 	return true;
 }
@@ -150,7 +151,9 @@ static inline void render_display_begin(struct obs_display *display)
 
 	gs_begin_scene();
 
-	vec4_set(&clear_color, 0.3f, 0.3f, 0.3f, 1.0f);
+	vec4_from_rgba(&clear_color, display->background_color);
+	clear_color.w = 1.0f;
+
 	gs_clear(GS_CLEAR_COLOR | GS_CLEAR_DEPTH | GS_CLEAR_STENCIL,
 			&clear_color, 1.0f, 0);
 
@@ -199,3 +202,9 @@ bool obs_display_enabled(obs_display_t *display)
 {
 	return display ? display->enabled : false;
 }
+
+void obs_display_set_background_color(obs_display_t *display, uint32_t color)
+{
+	if (display)
+		display->background_color = color;
+}

libobs/obs-internal.h

@@ -114,6 +114,7 @@ struct obs_display {
 	bool                            size_changed;
 	bool                            enabled;
 	uint32_t                        cx, cy;
+	uint32_t                        background_color;
 	gs_swapchain_t                  *swap;
 	pthread_mutex_t                 draw_callbacks_mutex;
 	DARRAY(struct draw_callback)    draw_callbacks;

libobs/obs.h

@@ -625,6 +625,9 @@ EXPORT void obs_display_remove_draw_callback(obs_display_t *display,
 EXPORT void obs_display_set_enabled(obs_display_t *display, bool enable);
 EXPORT bool obs_display_enabled(obs_display_t *display);
 
+EXPORT void obs_display_set_background_color(obs_display_t *display,
+		uint32_t color);
+
 
 /* ------------------------------------------------------------------------- */
 /* Sources */