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gsk/gl: support non-standard default framebuffer

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There are situations where our "default framebuffer" is not actually
zero, yet we still want to apply a scissor rect.

Generally, 0 is the default framebuffer. But on platforms where we need
to bind a platform-specific feature to a GL_FRAMEBUFFER, we might have a
default that is not 0. For example, on macOS we bind an IOSurfaceRef to
a GL_TEXTURE_RECTANGLE which then is assigned as the backing store for a
framebuffer. This is different than using gsk_gl_renderer_render_texture()
in that we don't want to incur an extra copy to the destination surface
nor do we even have a way to pass a texture_id into render_texture().
This commit is contained in:
Christian Hergert 2022-02-10 21:51:15 -08:00
parent b4b282dc81
commit f9268e8137
5 changed files with 46 additions and 12 deletions
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7
gdk/gdkglcontext.c
View File

@ -648,6 +648,12 @@ gdk_gl_context_surface_resized (GdkDrawContext *draw_context)
gdk_gl_context_clear_old_updated_area (context);
}
static guint
gdk_gl_context_real_get_default_framebuffer (GdkGLContext *self)
{
return 0;
}
static void
gdk_gl_context_class_init (GdkGLContextClass *klass)
{
@ -659,6 +665,7 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
klass->is_shared = gdk_gl_context_real_is_shared;
klass->make_current = gdk_gl_context_real_make_current;
klass->clear_current = gdk_gl_context_real_clear_current;
klass->get_default_framebuffer = gdk_gl_context_real_get_default_framebuffer;
draw_context_class->begin_frame = gdk_gl_context_real_begin_frame;
draw_context_class->end_frame = gdk_gl_context_real_end_frame;

2
gdk/gdkglcontextprivate.h
View File

@ -71,6 +71,8 @@ struct _GdkGLContextClass
gboolean (* is_shared) (GdkGLContext *self,
GdkGLContext *other);
guint (* get_default_framebuffer) (GdkGLContext *self);
};
typedef struct {

22
gsk/gl/gskglcommandqueue.c
View File

@ -750,11 +750,12 @@ static inline void
apply_scissor (gboolean *state,
guint framebuffer,
const graphene_rect_t *scissor,
gboolean has_scissor)
gboolean has_scissor,
guint default_framebuffer)
{
g_assert (framebuffer != (guint)-1);
if (framebuffer != 0 || !has_scissor)
if (framebuffer != default_framebuffer || !has_scissor)
{
if (*state != FALSE)
{
@ -935,15 +936,24 @@ gsk_gl_command_queue_sort_batches (GskGLCommandQueue *self)
* @self: a `GskGLCommandQueue`
* @surface_height: the height of the backing surface
* @scale_factor: the scale factor of the backing surface
* #scissor: (nullable): the scissor clip if any
* @scissor: (nullable): the scissor clip if any
* @default_framebuffer: the default framebuffer id if not zero
*
* Executes all of the batches in the command queue.
*
* Typically, the scissor rect is only applied when rendering to the default
* framebuffer (zero in most cases). However, if @default_framebuffer is not
* zero, it will be checked to see if the rendering target matches so that
* the scissor rect is applied. This should be used in cases where rendering
* to the backbuffer for display is not the default GL framebuffer of zero.
* Currently, this happens when rendering on macOS using IOSurface.
*/
void
gsk_gl_command_queue_execute (GskGLCommandQueue *self,
guint surface_height,
guint scale_factor,
const cairo_region_t *scissor)
const cairo_region_t *scissor,
guint default_framebuffer)
{
G_GNUC_UNUSED guint count = 0;
graphene_rect_t scissor_test;
@ -1049,7 +1059,7 @@ gsk_gl_command_queue_execute (GskGLCommandQueue *self,
case GSK_GL_COMMAND_KIND_CLEAR:
if (apply_framebuffer (&framebuffer, batch->clear.framebuffer))
{
apply_scissor (&scissor_state, framebuffer, &scissor_test, has_scissor);
apply_scissor (&scissor_state, framebuffer, &scissor_test, has_scissor, default_framebuffer);
n_fbos++;
}
@ -1073,7 +1083,7 @@ gsk_gl_command_queue_execute (GskGLCommandQueue *self,
if (apply_framebuffer (&framebuffer, batch->draw.framebuffer))
{
apply_scissor (&scissor_state, framebuffer, &scissor_test, has_scissor);
apply_scissor (&scissor_state, framebuffer, &scissor_test, has_scissor, default_framebuffer);
n_fbos++;
}

3
gsk/gl/gskglcommandqueueprivate.h
View File

@ -278,7 +278,8 @@ void gsk_gl_command_queue_end_frame (GskGLCommandQueue
void gsk_gl_command_queue_execute (GskGLCommandQueue *self,
guint surface_height,
guint scale_factor,
const cairo_region_t *scissor);
const cairo_region_t *scissor,
guint default_framebuffer);
int gsk_gl_command_queue_upload_texture (GskGLCommandQueue *self,
GdkTexture *texture,
int min_filter,

18
gsk/gl/gskglrenderjob.c
View File

@ -123,6 +123,7 @@ struct _GskGLRenderJob
* GL context.
*/
guint framebuffer;
guint default_framebuffer;
/* The viewport we are using. This state is updated as we process render
* nodes in the specific visitor callbacks.
@ -4058,7 +4059,7 @@ gsk_gl_render_job_render_flipped (GskGLRenderJob *job,
gsk_gl_render_job_end_draw (job);
gdk_gl_context_push_debug_group (job->command_queue->context, "Executing command queue");
gsk_gl_command_queue_execute (job->command_queue, surface_height, 1, NULL);
gsk_gl_command_queue_execute (job->command_queue, surface_height, 1, NULL, job->default_framebuffer);
gdk_gl_context_pop_debug_group (job->command_queue->context);
glDeleteFramebuffers (1, &framebuffer_id);
@ -4108,7 +4109,7 @@ gsk_gl_render_job_render (GskGLRenderJob *job,
start_time = GDK_PROFILER_CURRENT_TIME;
gsk_gl_command_queue_make_current (job->command_queue);
gdk_gl_context_push_debug_group (job->command_queue->context, "Executing command queue");
gsk_gl_command_queue_execute (job->command_queue, surface_height, scale_factor, job->region);
gsk_gl_command_queue_execute (job->command_queue, surface_height, scale_factor, job->region, job->default_framebuffer);
gdk_gl_context_pop_debug_group (job->command_queue->context);
gdk_profiler_add_mark (start_time, GDK_PROFILER_CURRENT_TIME-start_time, "Execute GL command queue", "");
}
@ -4157,11 +4158,23 @@ gsk_gl_render_job_new (GskGLDriver *driver,
const graphene_rect_t *clip_rect = viewport;
graphene_rect_t transformed_extents;
GskGLRenderJob *job;
GdkGLContext *context;
GLint default_framebuffer = 0;
g_return_val_if_fail (GSK_IS_GL_DRIVER (driver), NULL);
g_return_val_if_fail (viewport != NULL, NULL);
g_return_val_if_fail (scale_factor > 0, NULL);
/* Check for non-standard framebuffer binding as we might not be using
* the default framebuffer on systems like macOS where we've bound an
* IOSurface to a GL_TEXTURE_RECTANGLE. Otherwise, no scissor clip will
* be applied in the command queue causing overdrawing.
*/
context = driver->command_queue->context;
default_framebuffer = GDK_GL_CONTEXT_GET_CLASS (context)->get_default_framebuffer (context);
if (framebuffer == 0 && default_framebuffer != 0)
framebuffer = default_framebuffer;
job = g_slice_new0 (GskGLRenderJob);
job->driver = g_object_ref (driver);
job->command_queue = job->driver->command_queue;
@ -4169,6 +4182,7 @@ gsk_gl_render_job_new (GskGLDriver *driver,
job->modelview = g_array_sized_new (FALSE, FALSE, sizeof (GskGLRenderModelview), 16);
job->framebuffer = framebuffer;
job->clear_framebuffer = !!clear_framebuffer;
job->default_framebuffer = default_framebuffer;
job->offset_x = 0;
job->offset_y = 0;
job->scale_x = scale_factor;