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journal: Always keep a pointer back to the framebuffer

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Previously when adding a quad to the journal it would assume the
journal belongs to the framebuffer at the top of the framebuffer stack
and store a reference to that. We eventually want to get rid of the
framebuffer stack so we should avoid using it here. The journal now
takes a pointer back to the framebuffer in its constructor and it
always retains the pointer. As was done previously, the journal still
does not take a reference on the framebuffer unless it is non-empty so
it does not create a permanent circular reference.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts 2012-03-16 17:26:30 +00:00
parent dc00c27249
commit ff48f3b174
4 changed files with 37 additions and 44 deletions
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2
cogl/cogl-attribute.c
View File

@ -562,7 +562,7 @@ _cogl_flush_attributes_state (CoglFramebuffer *framebuffer,
CoglContext *ctx = framebuffer->context;
if (!(flags & COGL_DRAW_SKIP_JOURNAL_FLUSH))
_cogl_journal_flush (framebuffer->journal, framebuffer);
_cogl_journal_flush (framebuffer->journal);
layers_state.unit = 0;
layers_state.options.flags = 0;

4
cogl/cogl-framebuffer.c
View File

@ -189,7 +189,7 @@ _cogl_framebuffer_init (CoglFramebuffer *framebuffer,
/* Initialise the clip stack */
_cogl_clip_state_init (&framebuffer->clip_state);
framebuffer->journal = _cogl_journal_new ();
framebuffer->journal = _cogl_journal_new (framebuffer);
/* Ensure we know the framebuffer->clear_color* members can't be
* referenced for our fast-path read-pixel optimization (see
@ -633,7 +633,7 @@ _cogl_framebuffer_remove_all_dependencies (CoglFramebuffer *framebuffer)
void
_cogl_framebuffer_flush_journal (CoglFramebuffer *framebuffer)
{
_cogl_journal_flush (framebuffer->journal, framebuffer);
_cogl_journal_flush (framebuffer->journal);
}
void

5
cogl/cogl-journal-private.h
View File

@ -77,7 +77,7 @@ typedef struct _CoglJournalEntry
} CoglJournalEntry;
CoglJournal *
_cogl_journal_new (void);
_cogl_journal_new (CoglFramebuffer *framebuffer);
void
_cogl_journal_log_quad (CoglJournal *journal,
@ -89,8 +89,7 @@ _cogl_journal_log_quad (CoglJournal *journal,
unsigned int tex_coords_len);
void
_cogl_journal_flush (CoglJournal *journal,
CoglFramebuffer *framebuffer);
_cogl_journal_flush (CoglJournal *journal);
void
_cogl_journal_discard (CoglJournal *journal);

70
cogl/cogl-journal.c
View File

@ -96,8 +96,6 @@ typedef struct _CoglJournalFlushState
{
CoglJournal *journal;
CoglFramebuffer *framebuffer;
CoglAttributeBuffer *attribute_buffer;
GArray *attributes;
int current_attribute;
@ -143,10 +141,18 @@ _cogl_journal_free (CoglJournal *journal)
}
CoglJournal *
_cogl_journal_new (void)
_cogl_journal_new (CoglFramebuffer *framebuffer)
{
CoglJournal *journal = g_slice_new0 (CoglJournal);
/* The journal keeps a pointer back to the framebuffer because there
is effectively a 1:1 mapping between journals and framebuffers.
However, to avoid a circular reference the journal doesn't take a
reference unless it is non-empty. The framebuffer has a special
unref implementation to ensure that the journal is flushed when
the journal is the only thing keeping it alive */
journal->framebuffer = framebuffer;
journal->entries = g_array_new (FALSE, FALSE, sizeof (CoglJournalEntry));
journal->vertices = g_array_new (FALSE, FALSE, sizeof (float));
@ -270,6 +276,7 @@ _cogl_journal_flush_modelview_and_entries (CoglJournalEntry *batch_start,
void *data)
{
CoglJournalFlushState *state = data;
CoglFramebuffer *framebuffer = state->journal->framebuffer;
CoglAttribute **attributes;
CoglDrawFlags draw_flags = (COGL_DRAW_SKIP_JOURNAL_FLUSH |
COGL_DRAW_SKIP_PIPELINE_VALIDATION |
@ -305,7 +312,7 @@ _cogl_journal_flush_modelview_and_entries (CoglJournalEntry *batch_start,
if (ctx->driver == COGL_DRIVER_GL)
{
/* XXX: it's rather evil that we sneak in the GL_QUADS enum here... */
_cogl_framebuffer_draw_attributes (state->framebuffer,
_cogl_framebuffer_draw_attributes (framebuffer,
state->pipeline,
GL_QUADS,
state->current_vertex, batch_len * 4,
@ -320,7 +327,7 @@ _cogl_journal_flush_modelview_and_entries (CoglJournalEntry *batch_start,
{
CoglVerticesMode mode = COGL_VERTICES_MODE_TRIANGLES;
int first_vertex = state->current_vertex * 6 / 4;
_cogl_framebuffer_draw_indexed_attributes (state->framebuffer,
_cogl_framebuffer_draw_indexed_attributes (framebuffer,
state->pipeline,
mode,
first_vertex,
@ -332,7 +339,7 @@ _cogl_journal_flush_modelview_and_entries (CoglJournalEntry *batch_start,
}
else
{
_cogl_framebuffer_draw_attributes (state->framebuffer,
_cogl_framebuffer_draw_attributes (framebuffer,
state->pipeline,
COGL_VERTICES_MODE_TRIANGLE_FAN,
state->current_vertex, 4,
@ -379,7 +386,7 @@ _cogl_journal_flush_modelview_and_entries (CoglJournalEntry *batch_start,
loop_attributes[0] = attributes[0]; /* we just want the position */
for (i = 0; i < batch_len; i++)
_cogl_framebuffer_draw_attributes (state->framebuffer,
_cogl_framebuffer_draw_attributes (framebuffer,
outline,
COGL_VERTICES_MODE_LINE_LOOP,
4 * i + state->current_vertex, 4,
@ -576,7 +583,7 @@ _cogl_journal_flush_vbo_offsets_and_entries (CoglJournalEntry *batch_start,
void *data)
{
CoglJournalFlushState *state = data;
CoglContext *ctx = state->framebuffer->context;
CoglContext *ctx = state->journal->framebuffer->context;
gsize stride;
int i;
CoglAttribute **attribute_entry;
@ -711,7 +718,7 @@ _cogl_journal_flush_clip_stacks_and_entries (CoglJournalEntry *batch_start,
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_BATCHING)))
g_print ("BATCHING: clip stack batch len = %d\n", batch_len);
_cogl_clip_stack_flush (batch_start->clip_stack, state->framebuffer);
_cogl_clip_stack_flush (batch_start->clip_stack, state->journal->framebuffer);
/* XXX: Because we are manually flushing clip state here we need to
* make sure that the clip state gets updated the next time we flush
@ -1254,6 +1261,9 @@ _cogl_journal_discard (CoglJournal *journal)
{
int i;
if (journal->entries->len <= 0)
return;
for (i = 0; i < journal->entries->len; i++)
{
CoglJournalEntry *entry =
@ -1269,11 +1279,7 @@ _cogl_journal_discard (CoglJournal *journal)
/* The journal only holds a reference to the framebuffer while the
journal is not empty */
if (journal->framebuffer)
{
cogl_object_unref (journal->framebuffer);
journal->framebuffer = NULL;
}
cogl_object_unref (journal->framebuffer);
}
/* Note: A return value of FALSE doesn't mean 'no' it means
@ -1349,8 +1355,7 @@ _cogl_journal_all_entries_within_bounds (CoglJournal *journal,
* is undefined.
*/
void
_cogl_journal_flush (CoglJournal *journal,
CoglFramebuffer *framebuffer)
_cogl_journal_flush (CoglJournal *journal)
{
CoglJournalFlushState state;
int i;
@ -1366,31 +1371,25 @@ _cogl_journal_flush (CoglJournal *journal,
if (journal->entries->len == 0)
return;
/* Something has gone wrong if we're using a different framebuffer
to flush than the one that was current when the entries were
added */
_COGL_RETURN_IF_FAIL (framebuffer == journal->framebuffer);
/* The entries in this journal may depend on images in other
* framebuffers which may require that we flush the journals
* associated with those framebuffers before we can flush
* this journal... */
_cogl_framebuffer_flush_dependency_journals (framebuffer);
_cogl_framebuffer_flush_dependency_journals (journal->framebuffer);
/* Note: we start the timer after flushing dependency journals so
* that the timer isn't started recursively. */
COGL_TIMER_START (_cogl_uprof_context, flush_timer);
state.framebuffer = framebuffer;
cogl_push_framebuffer (framebuffer);
cogl_push_framebuffer (journal->framebuffer);
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_BATCHING)))
g_print ("BATCHING: journal len = %d\n", journal->entries->len);
/* NB: the journal deals with flushing the modelview stack and clip
state manually */
_cogl_framebuffer_flush_state (framebuffer,
framebuffer,
_cogl_framebuffer_flush_state (journal->framebuffer,
journal->framebuffer,
COGL_FRAMEBUFFER_STATE_ALL &
~(COGL_FRAMEBUFFER_STATE_MODELVIEW |
COGL_FRAMEBUFFER_STATE_CLIP));
@ -1399,9 +1398,11 @@ _cogl_journal_flush (CoglJournal *journal,
state.attributes = ctx->journal_flush_attributes_array;
modelview_stack = _cogl_framebuffer_get_modelview_stack (framebuffer);
modelview_stack =
_cogl_framebuffer_get_modelview_stack (journal->framebuffer);
state.modelview_stack = modelview_stack;
state.projection_stack = _cogl_framebuffer_get_projection_stack (framebuffer);
state.projection_stack =
_cogl_framebuffer_get_projection_stack (journal->framebuffer);
if (G_UNLIKELY ((COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_SOFTWARE_CLIP)) == 0))
{
@ -1516,11 +1517,9 @@ _cogl_journal_log_quad (CoglJournal *journal,
/* If the framebuffer was previously empty then we'll take a
reference to the current framebuffer. This reference will be
removed when the journal is flushed. FIXME: This should probably
be being passed a pointer to the framebuffer from further up so
that we don't have to rely on the global framebuffer stack */
removed when the journal is flushed */
if (journal->vertices->len == 0)
journal->framebuffer = cogl_object_ref (cogl_get_draw_framebuffer ());
cogl_object_ref (journal->framebuffer);
/* The vertex data is logged into a separate array. The data needs
to be copied into a vertex array before it's given to GL so we
@ -1611,13 +1610,8 @@ _cogl_journal_log_quad (CoglJournal *journal,
add_framebuffer_deps_cb,
journal->framebuffer);
/* XXX: It doesn't feel very nice that in this case we just assume
* that the journal is associated with the current framebuffer. I
* think a journal->framebuffer reference would seem nicer here but
* the reason we don't have that currently is that it would
* introduce a circular reference. */
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_BATCHING)))
_cogl_framebuffer_flush_journal (journal->framebuffer);
_cogl_journal_flush (journal);
COGL_TIMER_STOP (_cogl_uprof_context, log_timer);
}