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ngl: Tiled rendering experiment

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Render the tree 4 times, with clips to cut out one quarter
of the window. Not pushing things into threads yet. The
speedups are moderate at best, and there are some rendering
artifacts at tile boundaries.
This commit is contained in:
Matthias Clasen
2021-04-11 18:05:41 -04:00
parent 6712106c25
commit b23a03a44b
1 changed files with 70 additions and 1 deletions
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71
gsk/ngl/gsknglrenderer.c
View File

@@ -196,6 +196,7 @@ gsk_ngl_renderer_render (GskRenderer *renderer,
GskNglRenderJob *job;
GdkSurface *surface;
float scale_factor;
gint64 start_time, end_time;
g_assert (GSK_IS_NGL_RENDERER (renderer));
g_assert (root != NULL);
@@ -215,15 +216,83 @@ gsk_ngl_renderer_render (GskRenderer *renderer,
render_region = get_render_region (surface, self->context);
gsk_ngl_driver_begin_frame (self->driver, self->command_queue);
start_time = g_get_monotonic_time ();
g_print ("tiled:");
end_time = start_time;
for (int i = 0; i < 4; i++)
{
cairo_region_t *region;
gint64 st = end_time;
int w = gdk_surface_get_width (surface);
int h = gdk_surface_get_height (surface);
if (render_region)
region = cairo_region_copy (render_region);
else
region = cairo_region_create_rectangle (&(GdkRectangle){ 0, 0, w, h });
switch (i)
{
case 0:
cairo_region_intersect_rectangle (region,
&(cairo_rectangle_int_t) { 0, 0, w/2, h/2 });
break;
case 1:
cairo_region_intersect_rectangle (region,
&(cairo_rectangle_int_t) { w/2, 0, w - w/2, h/2 });
break;
case 2:
cairo_region_intersect_rectangle (region,
&(cairo_rectangle_int_t) { 0, h/2, w/2, h - h/2 });
break;
case 3:
cairo_region_intersect_rectangle (region,
&(cairo_rectangle_int_t) { w/2, h/2, w - w/2, h - h/2 });
break;
default:
g_assert_not_reached ();
break;
}
if (cairo_region_num_rectangles (region) == 0)
continue;
job = gsk_ngl_render_job_new (self->driver, &viewport, scale_factor, region, 0);
#ifdef G_ENABLE_DEBUG
if (GSK_RENDERER_DEBUG_CHECK (GSK_RENDERER (self), FALLBACK))
gsk_ngl_render_job_set_debug_fallback (job, TRUE);
#endif
gsk_ngl_render_job_render (job, root);
gsk_ngl_render_job_free (job);
cairo_region_destroy (region);
end_time = g_get_monotonic_time ();
g_print ("%s %.2f", i > 0 ? " /" : "", (end_time - st) / 1000.0);
}
g_print (" ms");
start_time = g_get_monotonic_time ();
job = gsk_ngl_render_job_new (self->driver, &viewport, scale_factor, render_region, 0);
#ifdef G_ENABLE_DEBUG
if (GSK_RENDERER_DEBUG_CHECK (GSK_RENDERER (self), FALLBACK))
gsk_ngl_render_job_set_debug_fallback (job, TRUE);
#endif
gsk_ngl_render_job_render (job, root);
gsk_ngl_driver_end_frame (self->driver);
gsk_ngl_render_job_free (job);
end_time = g_get_monotonic_time ();
g_print (" non-tiled: %.2fms\n", (end_time - start_time) / 1000.0);
gsk_ngl_driver_end_frame (self->driver);
gdk_gl_context_make_current (self->context);
gdk_draw_context_end_frame (GDK_DRAW_CONTEXT (self->context));