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gdkgl: Add gdk_gl_context_get_damage()

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This is a way to query the damaged area of the backbuffer.

The GL renderer uses this to compute the extents of that damage region
(computed via buffer age) and use them to minimize the area to redraw.

This changes the semantics of GL rendering to "When calling
gdk_window_begin_frame() with a GL context, the area by
gdk_gl_context_get_damage() needs to be redrawn and every other pixel of
the backbuffer is guaranteed to be correct.
After gdk_window_end_frame() on a GL-drawn window, the whole backbuffer
must be correct.

We can always glXBufferSwap() now because of this.
This commit is contained in:
Benjamin Otte 2016-12-04 16:33:13 +01:00
parent 582ea50faa
commit 8915be00d1
8 changed files with 235 additions and 136 deletions
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1
docs/reference/gdk/gdk4-sections.txt
View File

@ -1313,6 +1313,7 @@ gdk_gl_context_is_legacy
<SUBSECTION>
GdkGLError
gdk_gl_context_realize
gdk_gl_context_get_damage
gdk_gl_context_make_current
gdk_gl_context_get_current
gdk_gl_context_clear_current

36
gdk/gdkglcontext.c
View File

@ -255,6 +255,18 @@ gdk_gl_context_real_realize (GdkGLContext *self,
return FALSE;
}
static cairo_region_t *
gdk_gl_context_real_get_damage (GdkGLContext *context)
{
GdkWindow *window = gdk_draw_context_get_window (GDK_DRAW_CONTEXT (context));
return cairo_region_create_rectangle (&(GdkRectangle) {
0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window)
});
}
static void
gdk_gl_context_real_begin_frame (GdkDrawContext *draw_context,
cairo_region_t *region)
@ -262,6 +274,7 @@ gdk_gl_context_real_begin_frame (GdkDrawContext *draw_context,
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkWindow *window;
GdkGLContext *shared;
cairo_region_t *damage;
int ww, wh;
shared = gdk_gl_context_get_shared_context (context);
@ -271,6 +284,10 @@ gdk_gl_context_real_begin_frame (GdkDrawContext *draw_context,
return;
}
damage = gdk_gl_context_get_damage (context);
cairo_region_union (region, damage);
cairo_region_destroy (damage);
window = gdk_draw_context_get_window (draw_context);
ww = gdk_window_get_width (window) * gdk_window_get_scale_factor (window);
wh = gdk_window_get_height (window) * gdk_window_get_scale_factor (window);
@ -309,6 +326,7 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
klass->realize = gdk_gl_context_real_realize;
klass->get_damage = gdk_gl_context_real_get_damage;
draw_context_class->begin_frame = gdk_gl_context_real_begin_frame;
draw_context_class->end_frame = gdk_gl_context_real_end_frame;
@ -345,6 +363,24 @@ gdk_gl_context_init (GdkGLContext *self)
priv->use_es = -1;
}
/**
* gdk_gl_context_get_damage:
* @context: a #GdkGLContext
*
* Returns the part of the backbuffer that is known to be damaged and would
* need to be redrawn. This is the area that needs to be respected in addition
* to areas invalidated by GTK or the windowing system itself.
*
* Returns: The damage to the backbuffer
**/
cairo_region_t *
gdk_gl_context_get_damage (GdkGLContext *context)
{
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), cairo_region_create ());
return GDK_GL_CONTEXT_GET_CLASS (context)->get_damage (context);
}
GdkGLContextPaintData *
gdk_gl_context_get_paint_data (GdkGLContext *context)
{

3
gdk/gdkglcontext.h
View File

@ -82,6 +82,9 @@ gboolean gdk_gl_context_get_use_es (GdkGLContext *
GDK_AVAILABLE_IN_3_16
gboolean gdk_gl_context_realize (GdkGLContext *context,
GError **error);
GDK_AVAILABLE_IN_3_90
cairo_region_t * gdk_gl_context_get_damage (GdkGLContext *context);
GDK_AVAILABLE_IN_3_16
void gdk_gl_context_make_current (GdkGLContext *context);
GDK_AVAILABLE_IN_3_16

2
gdk/gdkglcontextprivate.h
View File

@ -44,6 +44,8 @@ struct _GdkGLContextClass
gboolean (* realize) (GdkGLContext *context,
GError **error);
cairo_region_t * (* get_damage) (GdkGLContext *context);
gboolean (* texture_from_surface) (GdkGLContext *context,
cairo_surface_t *surface,
cairo_region_t *region);

57
gdk/mir/gdkmirglcontext.c
View File

@ -97,28 +97,47 @@ gdk_mir_gl_context_realize (GdkGLContext *context,
return TRUE;
}
static void
gdk_mir_gl_context_begin_frame (GdkDrawContext *draw_context,
cairo_region_t *update_area)
static cairo_region_t *
gdk_mir_gl_context_get_damage (GdkGLContext *context)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkDisplay *display = gdk_draw_context_get_display (draw_context);
GdkWindow *window;
GdkDisplay *display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
EGLSurface egl_surface;
GdkWindow *window = gdk_draw_context_get_window (GDK_DRAW_CONTEXT (context));
unsigned int buffer_age = 0;
GDK_DRAW_CONTEXT_CLASS (gdk_x11_gl_context_parent_class)->begin_frame (draw_context, update_area);
if (gdk_gl_context_get_shared_context (context))
return;
if (_gdk_mir_display_have_egl_buffer_age (display))
{
GdkGLContext *shared;
GdkMirGLContext *shared_mir;
shared = gdk_gl_context_get_shared_context (context);
if (shared == NULL)
shared = context;
shared_mir = GDK_MIR_GL_CONTEXT (shared);
if (_gdk_mir_display_have_egl_swap_buffers_with_damage (display))
return;
egl_surface = _gdk_mir_window_get_egl_surface (window, shared_mir->egl_config);
gdk_gl_context_make_current (shared);
eglQuerySurface (_gdk_mir_display_get_egl_display (display), egl_surface,
EGL_BUFFER_AGE_EXT, &buffer_age);
/* If nothing else is known, repaint everything so that the back
buffer is fully up-to-date for the swapbuffer */
window = gdk_gl_context_get_window (context);
cairo_region_union_rectangle (update_area, &(GdkRectangle) {
0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window) });
if (buffer_age >= 2)
{
if (window->old_updated_area[0])
return cairo_region_copy (window->old_updated_area[0]);
}
else if (buffer_age >= 3)
{
if (window->old_updated_area[0] &&
window->old_updated_area[1])
{
cairo_region_t *damage = cairo_region_copy (window->old_updated_area[0]);
cairo_region_union (damage, window->old_updated_area[1]);
return damage;
}
}
}
return GDK_GL_CONTEXT_CLASS (gdk_mir_gl_context_parent_class)->get_damage (context);
}
static void
@ -197,7 +216,7 @@ gdk_mir_gl_context_class_init (GdkMirGLContextClass *klass)
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
context_class->realize = gdk_mir_gl_context_realize;
context_class->begin_frame = gdk_mir_gl_context_begin_frame;
context_class->get_damage = gdk_mir_gl_context_get_damage;
context_class->end_frame = gdk_mir_gl_context_end_frame;
gobject_class->dispose = gdk_mir_gl_context_dispose;
}

67
gdk/wayland/gdkglcontext-wayland.c
View File

@ -37,26 +37,6 @@ G_DEFINE_TYPE (GdkWaylandGLContext, gdk_wayland_gl_context, GDK_TYPE_GL_CONTEXT)
static void gdk_wayland_gl_context_dispose (GObject *gobject);
static void
gdk_wayland_gl_context_begin_frame (GdkDrawContext *draw_context,
cairo_region_t *update_area)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkWindow *window;
GDK_DRAW_CONTEXT_CLASS (gdk_wayland_gl_context_parent_class)->begin_frame (draw_context, update_area);
if (gdk_gl_context_get_shared_context (context))
return;
/* If nothing else is known, repaint everything so that the back
buffer is fully up-to-date for the swapbuffer */
window = gdk_gl_context_get_window (context);
cairo_region_union_rectangle (update_area, &(GdkRectangle) {
0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window) });
}
#define N_EGL_ATTRS 16
static gboolean
@ -175,6 +155,51 @@ gdk_wayland_gl_context_realize (GdkGLContext *context,
return TRUE;
}
static cairo_region_t *
gdk_wayland_gl_context_get_damage (GdkGLContext *context)
{
GdkDisplay *display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
EGLSurface egl_surface;
GdkWindow *window = gdk_draw_context_get_window (GDK_DRAW_CONTEXT (context));
int buffer_age = 0;
if (display_wayland->have_egl_buffer_age)
{
GdkGLContext *shared;
GdkWaylandGLContext *shared_wayland;
shared = gdk_gl_context_get_shared_context (context);
if (shared == NULL)
shared = context;
shared_wayland = GDK_WAYLAND_GL_CONTEXT (shared);
egl_surface = gdk_wayland_window_get_egl_surface (window->impl_window,
shared_wayland->egl_config);
gdk_gl_context_make_current (shared);
eglQuerySurface (display_wayland->egl_display, egl_surface,
EGL_BUFFER_AGE_EXT, &buffer_age);
if (buffer_age >= 2)
{
if (window->old_updated_area[0])
return cairo_region_copy (window->old_updated_area[0]);
}
else if (buffer_age >= 3)
{
if (window->old_updated_area[0] &&
window->old_updated_area[1])
{
cairo_region_t *damage = cairo_region_copy (window->old_updated_area[0]);
cairo_region_union (damage, window->old_updated_area[1]);
return damage;
}
}
}
return GDK_GL_CONTEXT_CLASS (gdk_wayland_gl_context_parent_class)->get_damage (context);
}
static void
gdk_wayland_gl_context_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted,
@ -227,10 +252,10 @@ gdk_wayland_gl_context_class_init (GdkWaylandGLContextClass *klass)
gobject_class->dispose = gdk_wayland_gl_context_dispose;
draw_context_class->begin_frame = gdk_wayland_gl_context_begin_frame;
draw_context_class->end_frame = gdk_wayland_gl_context_end_frame;
context_class->realize = gdk_wayland_gl_context_realize;
context_class->get_damage = gdk_wayland_gl_context_get_damage;
}
static void

111
gdk/x11/gdkglcontext-x11.c
View File

@ -119,48 +119,6 @@ maybe_wait_for_vblank (GdkDisplay *display,
}
}
static void
gdk_x11_gl_context_begin_frame (GdkDrawContext *draw_context,
cairo_region_t *update_area)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkWindow *window;
GDK_DRAW_CONTEXT_CLASS (gdk_x11_gl_context_parent_class)->begin_frame (draw_context, update_area);
if (gdk_gl_context_get_shared_context (context))
return;
if (gdk_gl_context_has_framebuffer_blit (context))
return;
window = gdk_gl_context_get_window (context);
/* If nothing else is known, repaint everything so that the back
buffer is fully up-to-date for the swapbuffer */
cairo_region_union_rectangle (update_area, &(GdkRectangle) {
0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window) });
}
static void
gdk_gl_blit_region (GdkWindow *window, cairo_region_t *region)
{
int n_rects, i;
int scale = gdk_window_get_scale_factor (window);
int wh = gdk_window_get_height (window);
cairo_rectangle_int_t rect;
n_rects = cairo_region_num_rectangles (region);
for (i = 0; i < n_rects; i++)
{
cairo_region_get_rectangle (region, i, &rect);
glScissor (rect.x * scale, (wh - rect.y - rect.height) * scale, rect.width * scale, rect.height * scale);
glBlitFramebuffer (rect.x * scale, (wh - rect.y - rect.height) * scale, (rect.x + rect.width) * scale, (wh - rect.y) * scale,
rect.x * scale, (wh - rect.y - rect.height) * scale, (rect.x + rect.width) * scale, (wh - rect.y) * scale,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
}
static void
gdk_x11_gl_context_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted,
@ -172,7 +130,7 @@ gdk_x11_gl_context_end_frame (GdkDrawContext *draw_context,
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
GdkRectangle whole_window;
//GdkRectangle whole_window;
DrawableInfo *info;
GLXDrawable drawable;
@ -225,32 +183,55 @@ gdk_x11_gl_context_end_frame (GdkDrawContext *draw_context,
}
}
whole_window = (GdkRectangle) { 0, 0, gdk_window_get_width (window), gdk_window_get_height (window) };
if (cairo_region_contains_rectangle (painted, &whole_window) == CAIRO_REGION_OVERLAP_IN)
{
glXSwapBuffers (dpy, drawable);
}
else if (gdk_gl_context_has_framebuffer_blit (context))
{
glDrawBuffer(GL_FRONT);
glReadBuffer(GL_BACK);
gdk_gl_blit_region (window, painted);
glDrawBuffer(GL_BACK);
glFlush();
if (gdk_gl_context_has_frame_terminator (context))
glFrameTerminatorGREMEDY ();
}
else
{
g_warning ("Need to swap whole buffer even thouigh not everything was redrawn. Expect artifacts.");
glXSwapBuffers (dpy, drawable);
}
glXSwapBuffers (dpy, drawable);
if (context_x11->do_frame_sync && info != NULL && display_x11->has_glx_video_sync)
glXGetVideoSyncSGI (&info->last_frame_counter);
}
static cairo_region_t *
gdk_x11_gl_context_get_damage (GdkGLContext *context)
{
GdkDisplay *display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkWindow *window = gdk_draw_context_get_window (GDK_DRAW_CONTEXT (context));
unsigned int buffer_age = 0;
if (display_x11->has_glx_buffer_age)
{
GdkGLContext *shared;
GdkX11GLContext *shared_x11;
shared = gdk_gl_context_get_shared_context (context);
if (shared == NULL)
shared = context;
shared_x11 = GDK_X11_GL_CONTEXT (shared);
gdk_gl_context_make_current (shared);
glXQueryDrawable(dpy, shared_x11->attached_drawable,
GLX_BACK_BUFFER_AGE_EXT, &buffer_age);
if (buffer_age >= 2)
{
if (window->old_updated_area[0])
return cairo_region_copy (window->old_updated_area[0]);
}
else if (buffer_age >= 3)
{
if (window->old_updated_area[0] &&
window->old_updated_area[1])
{
cairo_region_t *damage = cairo_region_copy (window->old_updated_area[0]);
cairo_region_union (damage, window->old_updated_area[1]);
return damage;
}
}
}
return GDK_GL_CONTEXT_CLASS (gdk_x11_gl_context_parent_class)->get_damage (context);
}
typedef struct {
Display *display;
GLXDrawable drawable;
@ -787,9 +768,9 @@ gdk_x11_gl_context_class_init (GdkX11GLContextClass *klass)
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
context_class->realize = gdk_x11_gl_context_realize;
context_class->get_damage = gdk_x11_gl_context_get_damage;
context_class->texture_from_surface = gdk_x11_gl_context_texture_from_surface;
draw_context_class->begin_frame = gdk_x11_gl_context_begin_frame;
draw_context_class->end_frame = gdk_x11_gl_context_end_frame;
gobject_class->dispose = gdk_x11_gl_context_dispose;

94
gsk/gskglrenderer.c
View File

@ -90,6 +90,11 @@ typedef struct {
} ProfileTimers;
#endif
typedef enum {
RENDER_FULL,
RENDER_SCISSOR
} RenderMode;
struct _GskGLRenderer
{
GskRenderer parent_instance;
@ -118,6 +123,8 @@ struct _GskGLRenderer
ProfileTimers profile_timers;
#endif
RenderMode render_mode;
gboolean has_buffers : 1;
};
@ -322,48 +329,45 @@ gsk_gl_renderer_unrealize (GskRenderer *renderer)
static GdkDrawingContext *
gsk_gl_renderer_begin_draw_frame (GskRenderer *renderer,
const cairo_region_t *region)
const cairo_region_t *update_area)
{
GskGLRenderer *self = GSK_GL_RENDERER (renderer);
cairo_region_t *whole_window;
cairo_region_t *damage;
GdkDrawingContext *result;
GdkRectangle whole_window;
GdkWindow *window;
window = gsk_renderer_get_window (renderer);
whole_window = (GdkRectangle) {
0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window)
};
damage = gdk_gl_context_get_damage (self->gl_context);
cairo_region_union (damage, update_area);
whole_window = cairo_region_create_rectangle (&(GdkRectangle) {
0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window)
});
if (cairo_region_contains_rectangle (damage, &whole_window) == CAIRO_REGION_OVERLAP_IN)
{
self->render_mode = RENDER_FULL;
}
else
{
GdkRectangle extents;
return gdk_window_begin_draw_frame (window,
GDK_DRAW_CONTEXT (self->gl_context),
region);
cairo_region_get_extents (damage, &extents);
cairo_region_union_rectangle (damage, &extents);
cairo_region_destroy (whole_window);
if (gdk_rectangle_equal (&extents, &whole_window))
self->render_mode = RENDER_FULL;
else
self->render_mode = RENDER_SCISSOR;
}
return result;
}
result = gdk_window_begin_draw_frame (window,
GDK_DRAW_CONTEXT (self->gl_context),
damage);
static GdkDrawingContext *
gsk_gl_renderer_begin_draw_frame (GskRenderer *renderer,
const cairo_region_t *region)
{
cairo_region_t *whole_window;
GdkDrawingContext *result;
GdkWindow *window;
window = gsk_renderer_get_window (renderer);
whole_window = cairo_region_create_rectangle (&(GdkRectangle) {
0, 0,
gdk_window_get_width (window),
gdk_window_get_height (window) });
result = GSK_RENDERER_CLASS (gsk_gl_renderer_parent_class)->begin_draw_frame (renderer, whole_window);
cairo_region_destroy (whole_window);
cairo_region_destroy (damage);
return result;
}
@ -859,6 +863,32 @@ gsk_gl_renderer_clear (GskGLRenderer *self)
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
}
static void
gsk_gl_renderer_setup_render_mode (GskGLRenderer *self)
{
switch (self->render_mode)
{
case RENDER_FULL:
glDisable (GL_SCISSOR_TEST);
break;
case RENDER_SCISSOR:
{
GdkDrawingContext *context = gsk_renderer_get_drawing_context (GSK_RENDERER (self));
GdkWindow *window = gsk_renderer_get_window (GSK_RENDERER (self));
GdkRectangle extents;
cairo_region_get_extents (gdk_drawing_context_get_clip (context), &extents);
glScissor (extents.x, gdk_window_get_height (window) - extents.height - extents.y, extents.width, extents.height);
glEnable (GL_SCISSOR_TEST);
break;
}
default:
g_assert_not_reached ();
break;
}
}
#define ORTHO_NEAR_PLANE -10000
#define ORTHO_FAR_PLANE 10000
@ -916,6 +946,8 @@ gsk_gl_renderer_render (GskRenderer *renderer,
if (gsk_gl_driver_bind_render_target (self->gl_driver, 0))
gsk_gl_renderer_resize_viewport (self, &viewport, scale_factor);
gsk_gl_renderer_setup_render_mode (self);
gsk_gl_renderer_clear (self);
glEnable (GL_DEPTH_TEST);