Lens flares out of view are not tested or drawn

A structure BSP's lens flare markers are submitted for every visible
cluster, and each gets an occlusion test every frame, including those
behind the camera or off the screen, whose tests count no pixels (so
they are never drawn). On the Xbox a test was nearly free; here each is
a draw and a query of its own, and a level of many lights (Medical
Block) tested about 460 a frame (debug.gpu_trace_heavy). A flare whose
test could not reach the screen, by the frustum and a sphere taking in
the test's offset point and size, is no longer submitted.

(cherry picked from commit e020bbc58dd08b4bcd609d8cf561c94b87cf4580)

source/rasterizer/rasterizer_lights.c

@@ -88,6 +88,7 @@ symbols in this file:
 #include "math/periodic_functions.h"
 #include "objects/widgets/widget_types.h"
 #include "render.h"
+#include "render/render_cameras_internal.h" /* port: render_frustum_sphere_visible */
 #include "scenario/scenario.h"
 #include "tag_files/tag_groups.h"
 #include "rasterizer_widgets.h"
@@ -559,9 +560,16 @@ void rasterizer_lens_flare_submit(
 				&camera_offset);
 			camera_distance= dot_product3d(&global_window_parameters.camera.forward, &camera_offset);
 
+			/* port: none out of view either (behind the camera, off the
+			screen): its occlusion test would count no pixels, so it would not
+			be drawn, and a level of many lights (Halo PC's maps) tested
+			hundreds a frame, each a draw of its own (the sphere takes in the
+			test's offset point and size, rasterizer_lens_flares_submit_occlusion_tests) */
 			if ((parameters->definition->far_fade_distance==0.0f ||
 				camera_distance<parameters->definition->far_fade_distance) &&
-				(parameters->compressed_light_color&LENS_FLARE_LIGHT_COLOR_ALPHA_MASK)>0)
+				(parameters->compressed_light_color&LENS_FLARE_LIGHT_COLOR_ALPHA_MASK)>0 &&
+				render_frustum_sphere_visible(&global_window_parameters.frustum, &parameters->position,
+					3.0f * parameters->definition->occlusion_radius))
 			{
 				struct rasterizer_lens_flare_submit_parameters *lens_flare_parameters=
 					lens_flare_parameters_get((short)local_lens_flare_count++);