diff --git a/cogl/cogl-clip-stack.c b/cogl/cogl-clip-stack.c index 0a2ccc88e..ab117c9d9 100644 --- a/cogl/cogl-clip-stack.c +++ b/cogl/cogl-clip-stack.c @@ -582,8 +582,7 @@ _cogl_clip_stack_pop (CoglClipStack *stack) } void -_cogl_clip_stack_flush (CoglClipStack *stack, - gboolean *stencil_used_p) +_cogl_clip_stack_flush (CoglClipStack *stack) { int has_clip_planes; gboolean using_clip_planes = FALSE; @@ -592,11 +591,32 @@ _cogl_clip_stack_flush (CoglClipStack *stack, int scissor_y0 = 0; int scissor_x1 = G_MAXINT; int scissor_y1 = G_MAXINT; - CoglMatrixStack *modelview_stack = - _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); + CoglMatrixStack *modelview_stack; CoglClipStack *entry; int scissor_y_start; + _COGL_GET_CONTEXT (ctx, NO_RETVAL); + + /* If we have already flushed this state then we don't need to do + anything */ + if (ctx->current_clip_stack_valid) + { + if (ctx->current_clip_stack == stack) + return; + + _cogl_clip_stack_unref (ctx->current_clip_stack); + } + + ctx->current_clip_stack_valid = TRUE; + ctx->current_clip_stack = _cogl_clip_stack_ref (stack); + + /* The current primitive journal does not support tracking changes to the + * clip stack... */ + _cogl_journal_flush (); + + modelview_stack = + _cogl_framebuffer_get_modelview_stack (_cogl_get_framebuffer ()); + has_clip_planes = cogl_features_available (COGL_FEATURE_FOUR_CLIP_PLANES); if (has_clip_planes) @@ -606,7 +626,7 @@ _cogl_clip_stack_flush (CoglClipStack *stack, /* If the stack is empty then there's nothing else to do */ if (stack == NULL) { - *stencil_used_p = FALSE; + ctx->current_clip_stack_uses_stencil = FALSE; GE (glDisable (GL_SCISSOR_TEST)); return; } @@ -718,5 +738,17 @@ _cogl_clip_stack_flush (CoglClipStack *stack, if (using_clip_planes) enable_clip_planes (); - *stencil_used_p = using_stencil_buffer; + ctx->current_clip_stack_uses_stencil = using_stencil_buffer; +} + +void +_cogl_clip_stack_dirty (void) +{ + _COGL_GET_CONTEXT (ctx, NO_RETVAL); + + if (ctx->current_clip_stack_valid) + { + ctx->current_clip_stack_valid = FALSE; + _cogl_clip_stack_unref (ctx->current_clip_stack); + } } diff --git a/cogl/cogl-clip-stack.h b/cogl/cogl-clip-stack.h index a52512e97..791cc7b76 100644 --- a/cogl/cogl-clip-stack.h +++ b/cogl/cogl-clip-stack.h @@ -57,8 +57,7 @@ CoglClipStack * _cogl_clip_stack_pop (CoglClipStack *stack); void -_cogl_clip_stack_flush (CoglClipStack *stack, - gboolean *stencil_used_p); +_cogl_clip_stack_flush (CoglClipStack *stack); CoglClipStack * _cogl_clip_stack_ref (CoglClipStack *stack); @@ -66,4 +65,7 @@ _cogl_clip_stack_ref (CoglClipStack *stack); void _cogl_clip_stack_unref (CoglClipStack *stack); +void +_cogl_clip_stack_dirty (void); + #endif /* __COGL_CLIP_STACK_H */ diff --git a/cogl/cogl-clip-state.c b/cogl/cogl-clip-state.c index 18850e09a..1b1033ce3 100644 --- a/cogl/cogl-clip-state.c +++ b/cogl/cogl-clip-state.c @@ -62,8 +62,6 @@ cogl_clip_push_window_rectangle (int x_offset, _cogl_clip_stack_push_window_rectangle (clip_state->stacks->data, x_offset, y_offset, width, height); - - clip_state->stack_dirty = TRUE; } /* XXX: This is deprecated API */ @@ -156,8 +154,6 @@ cogl_clip_push_rectangle (float x_1, _cogl_clip_stack_push_rectangle (clip_state->stacks->data, x_1, y_1, x_2, y_2, &modelview_matrix); - - clip_state->stack_dirty = TRUE; } /* XXX: Deprecated API */ @@ -194,8 +190,6 @@ cogl_clip_push_from_path_preserve (void) clip_state->stacks->data = _cogl_clip_stack_push_from_path (clip_state->stacks->data, cogl_get_path (), &modelview_matrix); - - clip_state->stack_dirty = TRUE; } void @@ -214,8 +208,6 @@ _cogl_clip_pop_real (CoglClipState *clip_state) _cogl_journal_flush (); clip_state->stacks->data = _cogl_clip_stack_pop (clip_state->stacks->data); - - clip_state->stack_dirty = TRUE; } void @@ -235,25 +227,9 @@ cogl_clip_pop (void) void _cogl_clip_state_flush (CoglClipState *clip_state) { - CoglClipStack *stack; - - if (!clip_state->stack_dirty) - return; - - /* The current primitive journal does not support tracking changes to the - * clip stack... */ - _cogl_journal_flush (); - - /* XXX: the handling of clipping is quite complex. It may involve use of - * the Cogl Journal or other Cogl APIs which may end up recursively - * wanting to ensure the clip state is flushed. We need to ensure we - * don't recurse infinitely... - */ - clip_state->stack_dirty = FALSE; - - stack = clip_state->stacks->data; - - _cogl_clip_stack_flush (stack, &clip_state->stencil_used); + /* Flush the topmost stack. The clip stack code will bail out early + if this is already flushed */ + _cogl_clip_stack_flush (clip_state->stacks->data); } /* XXX: This should never have been made public API! */ @@ -274,7 +250,6 @@ _cogl_clip_stack_save_real (CoglClipState *clip_state) _cogl_journal_flush (); clip_state->stacks = g_slist_prepend (clip_state->stacks, NULL); - clip_state->stack_dirty = TRUE; } void @@ -309,8 +284,6 @@ _cogl_clip_stack_restore_real (CoglClipState *clip_state) /* Revert to an old stack */ clip_state->stacks = g_slist_delete_link (clip_state->stacks, clip_state->stacks); - - clip_state->stack_dirty = TRUE; } void @@ -333,7 +306,6 @@ _cogl_clip_state_init (CoglClipState *clip_state) _COGL_GET_CONTEXT (ctx, NO_RETVAL); clip_state->stacks = NULL; - clip_state->stack_dirty = TRUE; /* Add an intial stack */ _cogl_clip_stack_save_real (clip_state); @@ -347,12 +319,6 @@ _cogl_clip_state_destroy (CoglClipState *clip_state) _cogl_clip_stack_restore_real (clip_state); } -void -_cogl_clip_state_dirty (CoglClipState *clip_state) -{ - clip_state->stack_dirty = TRUE; -} - CoglClipStack * _cogl_get_clip_stack (void) { diff --git a/cogl/cogl-clip-state.h b/cogl/cogl-clip-state.h index dd09449fa..6be552cb2 100644 --- a/cogl/cogl-clip-state.h +++ b/cogl/cogl-clip-state.h @@ -30,9 +30,6 @@ struct _CoglClipState { /* Stack of CoglClipStacks */ GSList *stacks; - - gboolean stack_dirty; - gboolean stencil_used; }; void @@ -41,9 +38,6 @@ _cogl_clip_state_init (CoglClipState *state); void _cogl_clip_state_destroy (CoglClipState *state); -void -_cogl_clip_state_dirty (CoglClipState *state); - void _cogl_clip_state_flush (CoglClipState *clip_state); diff --git a/cogl/cogl-context.c b/cogl/cogl-context.c index 7395b76a4..ad4f4f2e2 100644 --- a/cogl/cogl-context.c +++ b/cogl/cogl-context.c @@ -209,6 +209,8 @@ cogl_create_context (void) _context->texture_download_pipeline = COGL_INVALID_HANDLE; + _context->current_clip_stack_valid = FALSE; + /* The default for GL_ALPHA_TEST is to always pass which is equivalent to * the test being disabled therefore we assume that for all drivers there * will be no performance impact if we always leave the test enabled which @@ -310,6 +312,9 @@ _cogl_destroy_context (void) if (_context->default_layer_0) cogl_handle_unref (_context->default_layer_0); + if (_context->current_clip_stack_valid) + _cogl_clip_stack_unref (_context->current_clip_stack); + if (_context->atlas) _cogl_atlas_free (_context->atlas); diff --git a/cogl/cogl-context.h b/cogl/cogl-context.h index 96157cb28..e9a677570 100644 --- a/cogl/cogl-context.h +++ b/cogl/cogl-context.h @@ -187,6 +187,28 @@ typedef struct cogl_is_buffer */ GSList *buffer_types; + /* Clipping */ + /* TRUE if we have a valid clipping stack flushed. In that case + current_clip_stack will describe what the current state is. If + this is FALSE then the current clip stack is completely unknown + so it will need to be reflushed. In that case current_clip_stack + doesn't need to be a valid pointer. We can't just use NULL in + current_clip_stack to mark a dirty state because NULL is a valid + stack (meaning no clipping) */ + gboolean current_clip_stack_valid; + /* The clip state that was flushed. This isn't intended to be used + as a stack to push and pop new entries. Instead the current stack + that the user wants is part of the framebuffer state. This is + just used to record the flush state so we can avoid flushing the + same state multiple times. When the clip state is flushed this + will hold a reference */ + CoglClipStack *current_clip_stack; + /* Whether the stencil buffer was used as part of the current clip + state. If TRUE then any further use of the stencil buffer (such + as for drawing paths) would need to be merged with the existing + stencil buffer */ + gboolean current_clip_stack_uses_stencil; + CoglContextDriver drv; CoglContextWinsys winsys; } CoglContext; diff --git a/cogl/cogl-framebuffer.c b/cogl/cogl-framebuffer.c index 0a5388a74..47b166489 100644 --- a/cogl/cogl-framebuffer.c +++ b/cogl/cogl-framebuffer.c @@ -636,7 +636,7 @@ _cogl_set_framebuffer_real (CoglFramebuffer *framebuffer) * we flush */ _cogl_matrix_stack_dirty (framebuffer->modelview_stack); _cogl_matrix_stack_dirty (framebuffer->projection_stack); - _cogl_clip_state_dirty (&framebuffer->clip_state); + _cogl_clip_stack_dirty (); } void diff --git a/cogl/cogl-path.c b/cogl/cogl-path.c index 34f6b7946..02d32efe1 100644 --- a/cogl/cogl-path.c +++ b/cogl/cogl-path.c @@ -266,18 +266,14 @@ _cogl_path_get_bounds (CoglPath *path, static void _cogl_path_fill_nodes_with_stencil_buffer (CoglPath *path) { - CoglFramebuffer *framebuffer; - CoglClipState *clip_state; - _COGL_GET_CONTEXT (ctx, NO_RETVAL); _cogl_journal_flush (); - framebuffer = _cogl_get_framebuffer (); - clip_state = _cogl_framebuffer_get_clip_state (framebuffer); + g_assert (ctx->current_clip_stack_valid); _cogl_add_path_to_stencil_buffer (path, - clip_state->stencil_used, + ctx->current_clip_stack_uses_stencil, FALSE); cogl_rectangle (path->data->path_nodes_min.x, @@ -294,7 +290,7 @@ _cogl_path_fill_nodes_with_stencil_buffer (CoglPath *path) * we call cogl_flush() to emtpy the journal. */ cogl_flush (); - _cogl_clip_state_dirty (clip_state); + _cogl_clip_stack_dirty (); } static void