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matrix-stack: use GArray instead of GSList for stack

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In some micro-benchmarks testing journal throughput the list
manipulation jumps pretty high in the profile. This replaces the GSList
usage with a GArray instead which is effectively a grow only allocation
that means we avoid ongoing allocations while manipulating the stack
mid-scene.
This commit is contained in:
Robert Bragg 2010-11-01 22:07:11 +00:00
parent b41bf9e67f
commit 117ef6baff
1 changed files with 17 additions and 38 deletions
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55
cogl/cogl-matrix-stack.c
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@ -53,7 +53,7 @@ typedef struct {
*/ */
struct _CoglMatrixStack struct _CoglMatrixStack
{ {
GSList *stack; GArray *stack;
/* which state does GL have, NULL if unknown */ /* which state does GL have, NULL if unknown */
CoglMatrixState *flushed_state; CoglMatrixState *flushed_state;
@ -61,28 +61,17 @@ struct _CoglMatrixStack
}; };
/* XXX: this doesn't initialize the matrix! */ /* XXX: this doesn't initialize the matrix! */
static CoglMatrixState* static void
_cogl_matrix_state_new (void) _cogl_matrix_state_init (CoglMatrixState *state)
{ {
CoglMatrixState *state;
state = g_slice_new (CoglMatrixState);
state->push_count = 0; state->push_count = 0;
state->is_identity = FALSE; state->is_identity = FALSE;
return state;
} }
static void static CoglMatrixState *
_cogl_matrix_state_destroy (CoglMatrixState *state)
{
g_slice_free (CoglMatrixState, state);
}
static CoglMatrixState*
_cogl_matrix_stack_top (CoglMatrixStack *stack) _cogl_matrix_stack_top (CoglMatrixStack *stack)
{ {
return stack->stack->data; return &g_array_index (stack->stack, CoglMatrixState, stack->stack->len - 1);
} }
/* XXX: /* XXX:
@ -115,7 +104,10 @@ _cogl_matrix_stack_top_mutable (CoglMatrixStack *stack,
state->push_count -= 1; state->push_count -= 1;
new_top = _cogl_matrix_state_new (); g_array_set_size (stack->stack, stack->stack->len + 1);
new_top = &g_array_index (stack->stack, CoglMatrixState,
stack->stack->len - 1);
_cogl_matrix_state_init (new_top);
if (initialize) if (initialize)
{ {
@ -128,8 +120,6 @@ _cogl_matrix_stack_top_mutable (CoglMatrixStack *stack,
stack->flushed_state = new_top; stack->flushed_state = new_top;
} }
stack->stack = g_slist_prepend (stack->stack, new_top);
return new_top; return new_top;
} }
@ -141,28 +131,20 @@ _cogl_matrix_stack_new (void)
stack = g_slice_new0 (CoglMatrixStack); stack = g_slice_new0 (CoglMatrixStack);
state = _cogl_matrix_state_new (); stack->stack = g_array_sized_new (FALSE, FALSE,
sizeof (CoglMatrixState), 10);
g_array_set_size (stack->stack, 1);
state = &g_array_index (stack->stack, CoglMatrixState, 0);
_cogl_matrix_state_init (state);
state->is_identity = TRUE; state->is_identity = TRUE;
stack->stack = g_slist_prepend (stack->stack, state);
return stack; return stack;
} }
void void
_cogl_matrix_stack_destroy (CoglMatrixStack *stack) _cogl_matrix_stack_destroy (CoglMatrixStack *stack)
{ {
while (stack->stack) g_array_free (stack->stack, TRUE);
{
CoglMatrixState *state;
state = stack->stack->data;
_cogl_matrix_state_destroy (state);
stack->stack =
g_slist_delete_link (stack->stack,
stack->stack);
}
g_slice_free (CoglMatrixStack, stack); g_slice_free (CoglMatrixStack, stack);
} }
@ -192,7 +174,7 @@ _cogl_matrix_stack_pop (CoglMatrixStack *stack)
} }
else else
{ {
if (stack->stack->next == NULL) if (stack->stack->len == 1)
{ {
g_warning ("Too many matrix pops"); g_warning ("Too many matrix pops");
return; return;
@ -203,10 +185,7 @@ _cogl_matrix_stack_pop (CoglMatrixStack *stack)
stack->flushed_state = NULL; stack->flushed_state = NULL;
} }
stack->stack = g_array_set_size (stack->stack, stack->stack->len - 1);
g_slist_delete_link (stack->stack,
stack->stack);
_cogl_matrix_state_destroy (state);
} }
} }