/*************************************************************************/
/*  rendering_server_canvas.cpp                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "core/config/project_settings.h"

#include "core/containers/fixed_array.h"
#include "core/math/transform_interpolator.h"

#include "rendering_server_canvas.h"
#include "rendering_server_globals.h"
#include "rendering_server_raster.h"
#include "rendering_server_viewport.h"

static const int z_range = RS::CANVAS_ITEM_Z_MAX - RS::CANVAS_ITEM_Z_MIN + 1;

void RenderingServerCanvas::_render_canvas_item_tree(Item *p_canvas_item, const Transform2D &p_transform, const Rect2 &p_clip_rect, const Color &p_modulate) {
	memset(z_list, 0, z_range * sizeof(RasterizerCanvas::Item *));
	memset(z_last_list, 0, z_range * sizeof(RasterizerCanvas::Item *));

	_current_camera_transform = p_transform;

	if (_canvas_cull_mode == CANVAS_CULL_MODE_NODE) {
		_prepare_tree_bounds(p_canvas_item);
		_render_canvas_item_cull_by_node(p_canvas_item, p_transform, p_clip_rect, Color(1, 1, 1, 1), 0, z_list, z_last_list, nullptr, nullptr, false);
	} else {
		_render_canvas_item_cull_by_item(p_canvas_item, p_transform, p_clip_rect, Color(1, 1, 1, 1), 0, z_list, z_last_list, nullptr, nullptr);
	}

	RSG::canvas_render->canvas_render_items_begin(p_modulate, p_transform);
	for (int i = 0; i < z_range; i++) {
		if (!z_list[i]) {
			continue;
		}
		RSG::canvas_render->canvas_render_items(z_list[i], RS::CANVAS_ITEM_Z_MIN + i, p_modulate, p_transform);
	}
	RSG::canvas_render->canvas_render_items_end();
}

void _collect_ysort_children(RenderingServerCanvas::Item *p_canvas_item, Transform2D p_transform, RenderingServerCanvas::Item *p_material_owner, const Color p_modulate, RenderingServerCanvas::Item **r_items, int &r_index) {
	int child_item_count = p_canvas_item->child_items.size();
	RenderingServerCanvas::Item **child_items = p_canvas_item->child_items.ptrw();
	for (int i = 0; i < child_item_count; i++) {
		if (child_items[i]->visible) {
			if (r_items) {
				r_items[r_index] = child_items[i];
				child_items[i]->ysort_modulate = p_modulate;
				child_items[i]->ysort_xform = p_transform;
				child_items[i]->ysort_pos = p_transform.xform(child_items[i]->xform_curr.columns[2]);
				child_items[i]->material_owner = child_items[i]->use_parent_material ? p_material_owner : nullptr;
				child_items[i]->ysort_index = r_index;
			}

			r_index++;

			if (child_items[i]->sort_y) {
				_collect_ysort_children(child_items[i],
						p_transform * child_items[i]->xform_curr,
						child_items[i]->use_parent_material ? p_material_owner : child_items[i],
						p_modulate * child_items[i]->modulate,
						r_items, r_index);
			}
		}
	}
}

void _mark_ysort_dirty(RenderingServerCanvas::Item *ysort_owner, RID_Owner<RenderingServerCanvas::Item> &canvas_item_owner) {
	do {
		ysort_owner->ysort_children_count = -1;
		ysort_owner = canvas_item_owner.owns(ysort_owner->parent) ? canvas_item_owner.getornull(ysort_owner->parent) : nullptr;
	} while (ysort_owner && ysort_owner->sort_y);
}

void RenderingServerCanvas::_make_bound_dirty_reparent(Item *p_item) {
	MutexLock lock(_bound_mutex);
	DEV_ASSERT(p_item);

	Item *p_orig_item = p_item;

	// propagate up
	while (p_item) {
		// Don't worry about invisible objects
		if (!p_item->visible) {
			return;
		}

		if (!p_item->bound_dirty) {
			p_item->bound_dirty = true;

			if (canvas_item_owner.owns(p_item->parent)) {
				p_item = canvas_item_owner.get(p_item->parent);
			} else {
				break;
			}
		} else {
			break;
		}
	}

	// propagate down
	_make_bound_dirty_down(p_orig_item);
}

void RenderingServerCanvas::_make_bound_dirty(Item *p_item, bool p_changing_visibility) {
	if (_canvas_cull_mode != CANVAS_CULL_MODE_NODE) {
		return;
	}

	MutexLock lock(_bound_mutex);
	DEV_ASSERT(p_item);

	if (!p_changing_visibility) {
		_check_bound_integrity(p_item);
	}

	if (!p_changing_visibility) {
		// Traverse up the tree, making each item bound dirty until
		// we reach an item that is already dirty (as by definition, if this happens,
		// the tree should already be dirty up until the root).
		while (p_item) {
			// Don't worry about invisible objects
			if (!p_item->visible) {
				return;
			}

			if (!p_item->bound_dirty) {
				p_item->bound_dirty = true;

				if (canvas_item_owner.owns(p_item->parent)) {
					p_item = canvas_item_owner.get(p_item->parent);
				} else {
					break;
				}
			} else {
				break;
			}
		}
	} else {
		// special case for visibility changes.
		// if hiding, we propagate upwards.
		while (p_item) {
			if (!p_item->bound_dirty) {
				p_item->bound_dirty = true;
			}

			if (canvas_item_owner.owns(p_item->parent)) {
				p_item = canvas_item_owner.get(p_item->parent);
			} else {
				break;
			}
		}

		// if showing we propagate upwards AND downwards
		if (p_item->visible) {
			_make_bound_dirty_down(p_item);
		}
	}
}

void RenderingServerCanvas::_make_bound_dirty_down(Item *p_item) {
	// Bounds below an item that is being made visible may be out of date,
	// so we make them all dirty.
	if (!p_item->visible) {
		return;
	}

	p_item->bound_dirty = true;

	int child_item_count = p_item->child_items.size();
	Item **child_items = p_item->child_items.ptrw();

	for (int i = 0; i < child_item_count; i++) {
		_make_bound_dirty_down(child_items[i]);
	}
}

void RenderingServerCanvas::_prepare_tree_bounds(Item *p_root) {
	Rect2 root_bound;
	_calculate_canvas_item_bound(p_root, &root_bound);
}

// This function provides an alternative means of recursively calculating canvas item
// bounds through a branch, leading to an identical (hopefully) result to that
// calculated for the bound in _render_canvas_item().
// The reason for this function's existence is that there are some conditions which
// prevent further drawing in the tree (such as alpha nearing 0.0), in which we
// *still* need to calculate the bounds for lower branches and use them for culling,
// just in case alpha increases above the threshold in a later frame.
void RenderingServerCanvas::_calculate_canvas_item_bound(Item *p_canvas_item, Rect2 *r_branch_bound) {
	// TODO - this higher level technique may be able to be optimized better,
	// to perhaps only recalculate this on "reappearance" of the child branch, in a
	// similar manner to how visibility is handled.

	Item *ci = p_canvas_item;

	if (!ci->visible) {
		return;
	}

	// easy case, not dirty
	if (!ci->bound_dirty) {
		_merge_local_bound_to_branch(ci, r_branch_bound);
		return;
	}

	// recalculate the local bound only if out of date
	Rect2 *local_bound = nullptr;
	if (ci->bound_dirty) {
		local_bound = &ci->local_bound;
		*local_bound = Rect2();
		ci->bound_dirty = false;
	}

	int child_item_count = ci->child_items.size();
	Item **child_items = ci->child_items.ptrw();

	for (int i = 0; i < child_item_count; i++) {
		// if (ci->sort_y)
		// NYI do we need to apply the child_items[i]->ysort_xform? TEST
		// See the _render_canvas_item for how to apply.
		_calculate_canvas_item_bound(child_items[i], local_bound);
	}

	_finalize_and_merge_local_bound_to_branch(ci, r_branch_bound);

	// If we are interpolating, we want to modify the local_bound (combined)
	// to include both the previous AND current bounds.
	if (local_bound && _interpolation_data.interpolation_enabled && ci->interpolated) {
		Rect2 bound_prev = ci->local_bound_prev;

		// Keep track of the previously assigned exact bound for the next tick.
		ci->local_bound_prev = ci->local_bound;

		// The combined bound is the exact current bound merged with the previous exact bound.
		ci->local_bound = ci->local_bound.merge(bound_prev);

		// This can overflow, it's no problem, it is just rough to detect when items stop
		// having local bounds updated, so we can set prev to curr.
		ci->local_bound_last_update_tick = Engine::get_singleton()->get_physics_frames();

		// Detect special case of overflow.
		// This is omitted but included for reference.
		// It is such a rare possibility, and even if it did occur
		// so it should just result in slightly larger culling bounds
		// probably for one tick (and no visual errors).
		// Would occur once every 828.5 days at 60 ticks per second
		// with uint32_t counter.
#if 0
		if (!ci->local_bound_last_update_tick) {
			// Prevents it being treated as non-dirty.
			// Just has an increased delay of one tick in this very rare occurrence.
			ci->local_bound_last_update_tick = 1;
		}
#endif
	}
}

Transform2D RenderingServerCanvas::_calculate_item_global_xform(const Item *p_canvas_item) {
	// If we use more than the maximum scene tree depth, we are out of luck.
	// But that would be super inefficient anyway.
	FixedArray<const Transform2D *, 64> transforms;

	while (p_canvas_item) {
		// Should only happen if scene tree depth too high.
		if (transforms.is_full()) {
			WARN_PRINT_ONCE("SceneTree depth too high for hierarchical culling.");
			break;
		}

		// Note this is only using the CURRENT transform.
		// This may have implications for interpolated bounds - investigate.
		transforms.push_back(&p_canvas_item->xform_curr);

		if (canvas_item_owner.owns(p_canvas_item->parent)) {
			p_canvas_item = canvas_item_owner.get(p_canvas_item->parent);
		} else {
			p_canvas_item = nullptr;
		}
	}

	Transform2D tr;
	for (int n = (int)transforms.size() - 1; n >= 0; n--) {
		tr *= *transforms[n];
	}
	return tr;
}

void RenderingServerCanvas::_finalize_and_merge_local_bound_to_branch(Item *p_canvas_item, Rect2 *r_branch_bound) {
	if (r_branch_bound) {
		Rect2 this_rect = p_canvas_item->get_rect();

		// Special case .. if the canvas_item has use_identity_xform,
		// we need to transform the rect from global space to local space,
		// because the hierarchical culling expects local space.
		if (p_canvas_item->use_identity_xform) {
			// This is incredibly inefficient, but should only occur for e.g. CPUParticles2D,
			// and is difficult to avoid because global transform is not usually kept track of
			// in VisualServer (only final transform which is combinated with camera, and that
			// is only calculated on render, so is no use for culling purposes).
			Transform2D global_xform = _calculate_item_global_xform(p_canvas_item);
			this_rect = global_xform.affine_inverse().xform(this_rect);

			// Note that the efficiency will depend linearly on the scene tree depth of the
			// identity transform item.
			// So e.g. interpolated global CPUParticles2D may run faster at lower depths
			// in extreme circumstances.
		}

		// If this item has a bound...
		if (!p_canvas_item->local_bound.has_no_area()) {
			// If the rect has an area...
			if (!this_rect.has_no_area()) {
				p_canvas_item->local_bound = p_canvas_item->local_bound.merge(this_rect);
			} else {
				// The local bound is set by the children, but is not affected by the canvas item rect.
				// So pass through and merge the local bound to the parent.
			}
		} else {
			p_canvas_item->local_bound = this_rect;
			// don't merge zero area, as it may expand the branch bound
			// unnecessarily.
			if (p_canvas_item->local_bound.has_no_area()) {
				return;
			}
		}

		// Merge the local bound to the parent.
		_merge_local_bound_to_branch(p_canvas_item, r_branch_bound);
	}
}

void RenderingServerCanvas::_merge_local_bound_to_branch(Item *p_canvas_item, Rect2 *r_branch_bound) {
	if (!r_branch_bound) {
		return;
	}

	Rect2 this_item_total_local_bound = p_canvas_item->xform_curr.xform(p_canvas_item->local_bound);

	if (!r_branch_bound->has_no_area()) {
		*r_branch_bound = r_branch_bound->merge(this_item_total_local_bound);
	} else {
		*r_branch_bound = this_item_total_local_bound;
	}
}

void RenderingServerCanvas::_render_canvas_item_cull_by_item(Item *p_canvas_item, const Transform2D &p_transform, const Rect2 &p_clip_rect, const Color &p_modulate, int p_z, RasterizerCanvas::Item **z_list, RasterizerCanvas::Item **z_last_list, Item *p_canvas_clip, Item *p_material_owner) {
	Item *ci = p_canvas_item;

	if (!ci->visible) {
		return;
	}

	if (ci->children_order_dirty) {
		ci->child_items.sort_custom<ItemIndexSort>();
		ci->children_order_dirty = false;
	}

	Rect2 rect = ci->get_rect();
	Transform2D final_xform;
	if (!_interpolation_data.interpolation_enabled || !ci->interpolated) {
		final_xform = ci->xform_curr;
	} else {
		real_t f = Engine::get_singleton()->get_physics_interpolation_fraction();
		TransformInterpolator::interpolate_transform_2d(ci->xform_prev, ci->xform_curr, final_xform, f);
	}

	// Always calculate final transform as if not using identity xform.
	// This is so the expected transform is passed to children.
	// However, if use_identity_xform is set,
	// we can override the transform for rendering purposes for this item only.
	final_xform = p_transform * final_xform;

	Rect2 global_rect;
	if (!p_canvas_item->use_identity_xform) {
		global_rect = final_xform.xform(rect);
	} else {
		global_rect = _current_camera_transform.xform(rect);
	}

	global_rect.position += p_clip_rect.position;

	if (ci->use_parent_material && p_material_owner) {
		ci->material_owner = p_material_owner;
	} else {
		p_material_owner = ci;
		ci->material_owner = nullptr;
	}

	Color modulate(ci->modulate.r * p_modulate.r, ci->modulate.g * p_modulate.g, ci->modulate.b * p_modulate.b, ci->modulate.a * p_modulate.a);

	if (modulate.a < 0.007) {
		return;
	}

	int child_item_count = ci->child_items.size();
	Item **child_items = ci->child_items.ptrw();

	if (ci->clip) {
		if (p_canvas_clip != nullptr) {
			ci->final_clip_rect = p_canvas_clip->final_clip_rect.clip(global_rect);
		} else {
			ci->final_clip_rect = global_rect;
		}
		ci->final_clip_rect.position = ci->final_clip_rect.position.round();
		ci->final_clip_rect.size = ci->final_clip_rect.size.round();
		ci->final_clip_owner = ci;

	} else {
		ci->final_clip_owner = p_canvas_clip;
	}

	if (ci->sort_y) {
		if (ci->ysort_children_count == -1) {
			ci->ysort_children_count = 0;
			_collect_ysort_children(ci, Transform2D(), p_material_owner, Color(1, 1, 1, 1), nullptr, ci->ysort_children_count);
		}

		child_item_count = ci->ysort_children_count;
		child_items = (Item **)alloca(child_item_count * sizeof(Item *));

		int i = 0;
		_collect_ysort_children(ci, Transform2D(), p_material_owner, Color(1, 1, 1, 1), child_items, i);

		SortArray<Item *, ItemPtrSort> sorter;
		sorter.sort(child_items, child_item_count);
	}

	if (ci->z_relative) {
		p_z = CLAMP(p_z + ci->z_index, RS::CANVAS_ITEM_Z_MIN, RS::CANVAS_ITEM_Z_MAX);
	} else {
		p_z = ci->z_index;
	}

	for (int i = 0; i < child_item_count; i++) {
		if (!child_items[i]->behind || (ci->sort_y && child_items[i]->sort_y)) {
			continue;
		}
		if (ci->sort_y) {
			_render_canvas_item_cull_by_item(child_items[i], final_xform * child_items[i]->ysort_xform, p_clip_rect, modulate * child_items[i]->ysort_modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, (Item *)child_items[i]->material_owner);
		} else {
			_render_canvas_item_cull_by_item(child_items[i], final_xform, p_clip_rect, modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, p_material_owner);
		}
	}

	if (ci->copy_back_buffer) {
		ci->copy_back_buffer->screen_rect = final_xform.xform(ci->copy_back_buffer->rect).clip(p_clip_rect);
	}

	if (ci->update_when_visible) {
		RenderingServerRaster::redraw_request(false);
	}

	if ((!ci->commands.empty() && p_clip_rect.intersects(global_rect, true)) || ci->vp_render || ci->copy_back_buffer) {
		//something to draw?
		ci->final_transform = !p_canvas_item->use_identity_xform ? final_xform : _current_camera_transform;
		ci->final_modulate = Color(modulate.r * ci->self_modulate.r, modulate.g * ci->self_modulate.g, modulate.b * ci->self_modulate.b, modulate.a * ci->self_modulate.a);
		ci->global_rect_cache = global_rect;
		ci->global_rect_cache.position -= p_clip_rect.position;
		ci->light_masked = false;

		int zidx = p_z - RS::CANVAS_ITEM_Z_MIN;

		if (z_last_list[zidx]) {
			z_last_list[zidx]->next = ci;
			z_last_list[zidx] = ci;

		} else {
			z_list[zidx] = ci;
			z_last_list[zidx] = ci;
		}

		ci->next = nullptr;
	}

	for (int i = 0; i < child_item_count; i++) {
		if (child_items[i]->behind || (ci->sort_y && child_items[i]->sort_y)) {
			continue;
		}
		if (ci->sort_y) {
			_render_canvas_item_cull_by_item(child_items[i], final_xform * child_items[i]->ysort_xform, p_clip_rect, modulate * child_items[i]->ysort_modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, (Item *)child_items[i]->material_owner);
		} else {
			_render_canvas_item_cull_by_item(child_items[i], final_xform, p_clip_rect, modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, p_material_owner);
		}
	}
}

void RenderingServerCanvas::_render_canvas_item_cull_by_node(Item *p_canvas_item, const Transform2D &p_transform, const Rect2 &p_clip_rect, const Color &p_modulate, int p_z, RasterizerCanvas::Item **z_list, RasterizerCanvas::Item **z_last_list, Item *p_canvas_clip, Item *p_material_owner, bool p_enclosed) {
	Item *ci = p_canvas_item;

	if (!ci->visible) {
		return;
	}

	// This should have been calculated as a pre-process.
	DEV_ASSERT(!ci->bound_dirty);

	// If we are interpolating, and the updates have stopped, we can reduce the local bound.
	if (ci->local_bound_last_update_tick && (ci->local_bound_last_update_tick != Engine::get_singleton()->get_physics_frames())) {
		// The combined bound is reduced to the last calculated exact bound.
		ci->local_bound = ci->local_bound_prev;
		ci->local_bound_last_update_tick = 0;
	}

	Rect2 rect = ci->get_rect();

	Transform2D final_xform;
	if (!_interpolation_data.interpolation_enabled || !ci->interpolated) {
		final_xform = ci->xform_curr;
	} else {
		real_t f = Engine::get_singleton()->get_physics_interpolation_fraction();
		TransformInterpolator::interpolate_transform_2d(ci->xform_prev, ci->xform_curr, final_xform, f);
	}

	// Always calculate final transform as if not using identity xform.
	// This is so the expected transform is passed to children.
	// However, if use_identity_xform is set,
	// we can override the transform for rendering purposes for this item only.
	final_xform = p_transform * final_xform;

	Rect2 global_rect;
	if (!p_canvas_item->use_identity_xform) {
		global_rect = final_xform.xform(rect);
	} else {
		global_rect = _current_camera_transform.xform(rect);
	}

	ci->global_rect_cache = global_rect;
	ci->final_transform = !p_canvas_item->use_identity_xform ? final_xform : _current_camera_transform;

	global_rect.position += p_clip_rect.position;

	int child_item_count = ci->child_items.size();

	// If there are children, we can maybe cull them all out if the cached bound has not changed.
	if (!p_enclosed && child_item_count) {
		// Get the bound in final space.
		Rect2 bound = final_xform.xform(ci->local_bound);

		bound.position += p_clip_rect.position;
		if (!ci->vp_render && !ci->copy_back_buffer) {
			// Cull out ALL children in one step.
			if (!p_clip_rect.intersects(bound, true)) {
				return;
			}
		}

		// can we combine with earlier check?
		// if we enclose the bound completely, no need to check further children
		p_enclosed = p_clip_rect.encloses(bound);
	}

	// if we are culled, and no children, no more needs doing
	bool item_is_visible = ((!ci->commands.empty() && (p_enclosed ? true : p_clip_rect.intersects(global_rect, true))) || ci->vp_render || ci->copy_back_buffer);

	if (!item_is_visible && !child_item_count) {
		return;
	}

	if (ci->use_parent_material && p_material_owner) {
		ci->material_owner = p_material_owner;
	} else {
		p_material_owner = ci;
		ci->material_owner = nullptr;
	}

	Color modulate(ci->modulate.r * p_modulate.r, ci->modulate.g * p_modulate.g, ci->modulate.b * p_modulate.b, ci->modulate.a * p_modulate.a);

	if (modulate.a < 0.007) {
		return;
	}

	if (ci->children_order_dirty) {
		ci->child_items.sort_custom<ItemIndexSort>();
		ci->children_order_dirty = false;
	}

	Item **child_items = ci->child_items.ptrw();

	if (ci->clip) {
		if (p_canvas_clip != nullptr) {
			ci->final_clip_rect = p_canvas_clip->final_clip_rect.clip(global_rect);
		} else {
			ci->final_clip_rect = global_rect;
		}
		ci->final_clip_rect.position = ci->final_clip_rect.position.round();
		ci->final_clip_rect.size = ci->final_clip_rect.size.round();
		ci->final_clip_owner = ci;

	} else {
		ci->final_clip_owner = p_canvas_clip;
	}

	if (ci->sort_y) {
		if (ci->ysort_children_count == -1) {
			ci->ysort_children_count = 0;
			_collect_ysort_children(ci, Transform2D(), p_material_owner, Color(1, 1, 1, 1), nullptr, ci->ysort_children_count);
		}

		child_item_count = ci->ysort_children_count;

		// NOTE : Use of alloca here in a recursive function could make it susceptible to stack overflow.
		// This was present in the original Item code. Consider changing to make safer.
		child_items = (Item **)alloca(child_item_count * sizeof(Item *));

		int i = 0;
		_collect_ysort_children(ci, Transform2D(), p_material_owner, Color(1, 1, 1, 1), child_items, i);

		SortArray<Item *, ItemPtrSort> sorter;
		sorter.sort(child_items, child_item_count);
	}

	if (ci->z_relative) {
		p_z = CLAMP(p_z + ci->z_index, RS::CANVAS_ITEM_Z_MIN, RS::CANVAS_ITEM_Z_MAX);
	} else {
		p_z = ci->z_index;
	}

	for (int i = 0; i < child_item_count; i++) {
		if (!child_items[i]->behind || (ci->sort_y && child_items[i]->sort_y)) {
			continue;
		}
		if (ci->sort_y) {
			_render_canvas_item_cull_by_node(child_items[i], final_xform * child_items[i]->ysort_xform, p_clip_rect, modulate * child_items[i]->ysort_modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, (Item *)child_items[i]->material_owner, p_enclosed);
		} else {
			_render_canvas_item_cull_by_node(child_items[i], final_xform, p_clip_rect, modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, p_material_owner, p_enclosed);
		}
	}

	if (ci->copy_back_buffer) {
		ci->copy_back_buffer->screen_rect = final_xform.xform(ci->copy_back_buffer->rect).clip(p_clip_rect);
	}

	// something to draw?
	if (item_is_visible) {
		// Note : This has been moved to inside the (item_is_visible) check.
		// It was OUTSIDE in the item culled code, which I suspect was incorrect.
		// A redraw should not be issued if an item is not on screen?
		// Even so, watch for regressions here.
		if (ci->update_when_visible) {
			RenderingServerRaster::redraw_request(false);
		}

		// Note we have already stored ci->final_transform
		// and ci->global_rect_cache, and made sure these are up to date.
		ci->final_modulate = Color(modulate.r * ci->self_modulate.r, modulate.g * ci->self_modulate.g, modulate.b * ci->self_modulate.b, modulate.a * ci->self_modulate.a);
		ci->light_masked = false;

		int zidx = p_z - RS::CANVAS_ITEM_Z_MIN;

		if (z_last_list[zidx]) {
			z_last_list[zidx]->next = ci;
			z_last_list[zidx] = ci;

		} else {
			z_list[zidx] = ci;
			z_last_list[zidx] = ci;
		}

		ci->next = nullptr;
	}

	for (int i = 0; i < child_item_count; i++) {
		if (child_items[i]->behind || (ci->sort_y && child_items[i]->sort_y)) {
			continue;
		}
		if (ci->sort_y) {
			_render_canvas_item_cull_by_node(child_items[i], final_xform * child_items[i]->ysort_xform, p_clip_rect, modulate * child_items[i]->ysort_modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, (Item *)child_items[i]->material_owner, p_enclosed);
		} else {
			_render_canvas_item_cull_by_node(child_items[i], final_xform, p_clip_rect, modulate, p_z, z_list, z_last_list, (Item *)ci->final_clip_owner, p_material_owner, p_enclosed);
		}
	}
}

void RenderingServerCanvas::render_canvas(Canvas *p_canvas, const Transform2D &p_transform, const Rect2 &p_clip_rect, int p_canvas_layer_id) {
	RSG::canvas_render->canvas_begin();

	if (p_canvas->children_order_dirty) {
		p_canvas->child_items.sort();
		p_canvas->children_order_dirty = false;
	}

	int l = p_canvas->child_items.size();
	Canvas::ChildItem *ci = p_canvas->child_items.ptrw();

	bool has_mirror = false;
	for (int i = 0; i < l; i++) {
		if (ci[i].mirror.x || ci[i].mirror.y) {
			has_mirror = true;
			break;
		}
	}

	if (!has_mirror) {
		static const int z_range = RS::CANVAS_ITEM_Z_MAX - RS::CANVAS_ITEM_Z_MIN + 1;
		RasterizerCanvas::Item *z_list[z_range];
		RasterizerCanvas::Item *z_last_list[z_range];

		memset(z_list, 0, z_range * sizeof(RasterizerCanvas::Item *));
		memset(z_last_list, 0, z_range * sizeof(RasterizerCanvas::Item *));

		_current_camera_transform = p_transform;

#ifdef RENDERING_SERVER_CANVAS_TIME_NODE_CULLING
		bool measure = (Engine::get_singleton()->get_frames_drawn() % 100) == 0;
		measure &= !Engine::get_singleton()->is_editor_hint();

		if (measure) {
			uint64_t totalA = 0;
			uint64_t totalB = 0;

			for (int i = 0; i < l; i++) {
				uint64_t beforeB = OS::get_singleton()->get_ticks_usec();
				_render_canvas_item_cull_by_item(ci[i].item, p_transform, p_clip_rect, Color(1, 1, 1, 1), 0, z_list, z_last_list, nullptr, nullptr);
				uint64_t afterB = OS::get_singleton()->get_ticks_usec();

				uint64_t beforeA = OS::get_singleton()->get_ticks_usec();
				_prepare_tree_bounds(ci[i].item);
				_render_canvas_item_cull_by_node(ci[i].item, p_transform, p_clip_rect, Color(1, 1, 1, 1), 0, z_list, z_last_list, nullptr, nullptr, false);
				uint64_t afterA = OS::get_singleton()->get_ticks_usec();

				totalA += afterA - beforeA;
				totalB += afterB - beforeB;

			} // for i

			print_line("old : " + itos(totalB) + ", new : " + itos(totalA));

		} // if measure
		else {
#else
		{
#endif
			if (_canvas_cull_mode == CANVAS_CULL_MODE_NODE) {
				for (int i = 0; i < l; i++) {
					_prepare_tree_bounds(ci[i].item);
					_render_canvas_item_cull_by_node(ci[i].item, p_transform, p_clip_rect, Color(1, 1, 1, 1), 0, z_list, z_last_list, nullptr, nullptr, false);
				}
			} else {
				for (int i = 0; i < l; i++) {
					_render_canvas_item_cull_by_item(ci[i].item, p_transform, p_clip_rect, Color(1, 1, 1, 1), 0, z_list, z_last_list, nullptr, nullptr);
				}
			}
		} // if not measure

		RSG::canvas_render->canvas_render_items_begin(p_canvas->modulate, p_transform);
		for (int i = 0; i < z_range; i++) {
			if (!z_list[i]) {
				continue;
			}

			RSG::canvas_render->canvas_render_items(z_list[i], RS::CANVAS_ITEM_Z_MIN + i, p_canvas->modulate, p_transform);
		}
		RSG::canvas_render->canvas_render_items_end();
	} else {
		for (int i = 0; i < l; i++) {
			const Canvas::ChildItem &ci2 = p_canvas->child_items[i];
			_render_canvas_item_tree(ci2.item, p_transform, p_clip_rect, p_canvas->modulate);

			//mirroring (useful for scrolling backgrounds)
			if (ci2.mirror.x != 0) {
				Transform2D xform2 = p_transform * Transform2D(0, Vector2(ci2.mirror.x, 0));
				_render_canvas_item_tree(ci2.item, xform2, p_clip_rect, p_canvas->modulate);
			}
			if (ci2.mirror.y != 0) {
				Transform2D xform2 = p_transform * Transform2D(0, Vector2(0, ci2.mirror.y));
				_render_canvas_item_tree(ci2.item, xform2, p_clip_rect, p_canvas->modulate);
			}
			if (ci2.mirror.y != 0 && ci2.mirror.x != 0) {
				Transform2D xform2 = p_transform * Transform2D(0, ci2.mirror);
				_render_canvas_item_tree(ci2.item, xform2, p_clip_rect, p_canvas->modulate);
			}
		}
	}

	RSG::canvas_render->canvas_end();
}

RID RenderingServerCanvas::canvas_create() {
	Canvas *canvas = memnew(Canvas);
	ERR_FAIL_COND_V(!canvas, RID());
	RID rid = canvas_owner.make_rid(canvas);

	return rid;
}

void RenderingServerCanvas::canvas_set_item_mirroring(RID p_canvas, RID p_item, const Point2 &p_mirroring) {
	Canvas *canvas = canvas_owner.getornull(p_canvas);
	ERR_FAIL_COND(!canvas);
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	int idx = canvas->find_item(canvas_item);
	ERR_FAIL_COND(idx == -1);
	canvas->child_items.write[idx].mirror = p_mirroring;
}
void RenderingServerCanvas::canvas_set_modulate(RID p_canvas, const Color &p_color) {
	Canvas *canvas = canvas_owner.get(p_canvas);
	ERR_FAIL_COND(!canvas);
	canvas->modulate = p_color;
}

void RenderingServerCanvas::canvas_set_disable_scale(bool p_disable) {
	disable_scale = p_disable;
}

void RenderingServerCanvas::canvas_set_parent(RID p_canvas, RID p_parent, float p_scale) {
	Canvas *canvas = canvas_owner.get(p_canvas);
	ERR_FAIL_COND(!canvas);

	canvas->parent = p_parent;
	canvas->parent_scale = p_scale;
}

RID RenderingServerCanvas::canvas_item_create() {
	Item *canvas_item = memnew(Item);
	ERR_FAIL_COND_V(!canvas_item, RID());

	return canvas_item_owner.make_rid(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_name(RID p_item, String p_name) {
#ifdef RENDERING_SERVER_CANVAS_DEBUG_ITEM_NAMES
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);
	canvas_item->name = p_name;
#endif
}

void RenderingServerCanvas::canvas_item_set_parent(RID p_item, RID p_parent) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	// dirty the item and any previous parents
	_make_bound_dirty(canvas_item);

	if (canvas_item->parent.is_valid()) {
		if (canvas_owner.owns(canvas_item->parent)) {
			Canvas *canvas = canvas_owner.get(canvas_item->parent);
			canvas->erase_item(canvas_item);
		} else if (canvas_item_owner.owns(canvas_item->parent)) {
			Item *item_owner = canvas_item_owner.get(canvas_item->parent);
			item_owner->child_items.erase(canvas_item);

			if (item_owner->sort_y) {
				_mark_ysort_dirty(item_owner, canvas_item_owner);
			}
		}

		canvas_item->parent = RID();
	}

	if (p_parent.is_valid()) {
		if (canvas_owner.owns(p_parent)) {
			Canvas *canvas = canvas_owner.get(p_parent);
			Canvas::ChildItem ci;
			ci.item = canvas_item;
			canvas->child_items.push_back(ci);
			canvas->children_order_dirty = true;

			_make_bound_dirty(canvas_item);
		} else if (canvas_item_owner.owns(p_parent)) {
			Item *item_owner = canvas_item_owner.get(p_parent);
			item_owner->child_items.push_back(canvas_item);
			item_owner->children_order_dirty = true;

			if (item_owner->sort_y) {
				_mark_ysort_dirty(item_owner, canvas_item_owner);
			}

			// keep the integrity of the bounds when adding to avoid false
			// warning flags, by forcing the added child to be dirty
			canvas_item->bound_dirty = false;
			canvas_item->parent = p_parent;
			_make_bound_dirty_reparent(canvas_item);

		} else {
			ERR_FAIL_MSG("Invalid parent.");
		}
	}

	canvas_item->parent = p_parent;

	_check_bound_integrity(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_visible(RID p_item, bool p_visible) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	// check for noop
	if (p_visible != canvas_item->visible) {
		canvas_item->visible = p_visible;
		_make_bound_dirty(canvas_item, true);
	}

	// could this be enclosed in the noop? not sure
	_mark_ysort_dirty(canvas_item, canvas_item_owner);
}
void RenderingServerCanvas::canvas_item_set_light_mask(RID p_item, int p_mask) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->light_mask = p_mask;
	_check_bound_integrity(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_transform(RID p_item, const Transform2D &p_transform) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	if (_interpolation_data.interpolation_enabled && canvas_item->interpolated) {
		if (!canvas_item->on_interpolate_transform_list) {
			_interpolation_data.canvas_item_transform_update_list_curr->push_back(p_item);
			canvas_item->on_interpolate_transform_list = true;
		} else {
			DEV_ASSERT(_interpolation_data.canvas_item_transform_update_list_curr->size());
		}
	}

	if (_interpolation_data.interpolation_enabled && canvas_item->interpolated) {
		if (!canvas_item->on_interpolate_transform_list) {
			_interpolation_data.canvas_item_transform_update_list_curr->push_back(p_item);
			canvas_item->on_interpolate_transform_list = true;
		} else {
			DEV_ASSERT(_interpolation_data.canvas_item_transform_update_list_curr->size());
		}
	}

	canvas_item->xform_curr = p_transform;

	// Special case!
	// Modifying the transform DOES NOT affect the local bound.
	// It only affects the local bound of the PARENT node (if there is one).
	if (canvas_item_owner.owns(canvas_item->parent)) {
		Item *canvas_item_parent = canvas_item_owner.get(canvas_item->parent);
		_make_bound_dirty(canvas_item_parent);
	}
}
void RenderingServerCanvas::canvas_item_set_clip(RID p_item, bool p_clip) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->clip = p_clip;
	_make_bound_dirty(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_distance_field_mode(RID p_item, bool p_enable) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->distance_field = p_enable;
	_make_bound_dirty(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_custom_rect(RID p_item, bool p_custom_rect, const Rect2 &p_rect) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->custom_rect = p_custom_rect;
	canvas_item->rect = p_rect;
	_make_bound_dirty(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_modulate(RID p_item, const Color &p_color) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->modulate = p_color;
	_make_bound_dirty(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_self_modulate(RID p_item, const Color &p_color) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->self_modulate = p_color;
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_draw_behind_parent(RID p_item, bool p_enable) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->behind = p_enable;
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_use_identity_transform(RID p_item, bool p_enable) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->use_identity_xform = p_enable;
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_update_when_visible(RID p_item, bool p_update) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->update_when_visible = p_update;
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_line(RID p_item, const Point2 &p_from, const Point2 &p_to, const Color &p_color, float p_width, bool p_antialiased) {
	// Try drawing as a poly, because polys are batched and thus should run faster than thick lines,
	// which run extremely slowly.
	if (!p_antialiased && (p_width > 1.0)) {
		// use poly drawing, as it is faster as it can use batching
		static Vector<Point2> points;
		static Vector<Color> colors;
		static Vector<Point2> uvs;
		if (points.size() != 4) {
			// this should only be done once at runtime due to use of a static
			points.resize(4);
			colors.resize(4);
			uvs.resize(4);
		}

		Vector2 side = p_to - p_from;
		real_t length = side.length();
		if (length == 0.0) {
			// Not sure yet whether zero length is a noop operation later on,
			// watch for visual errors. If there are visual errors, pass through
			// to the line drawing routine below.
			return;
		}

		// normalize
		side /= length;

		// 90 degrees
		side = Vector2(-side.y, side.x);
		side *= p_width * 0.5;

		points.set(0, p_from + side);
		points.set(1, p_from - side);
		points.set(2, p_to - side);
		points.set(3, p_to + side);

		for (int n = 0; n < 4; n++) {
			colors.set(n, p_color);
		}

		canvas_item_add_polygon(p_item, points, colors, uvs, RID(), RID(), false);
		return;
	}

	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandLine *line = memnew(Item::CommandLine);
	ERR_FAIL_COND(!line);
	line->color = p_color;
	line->from = p_from;
	line->to = p_to;
	line->width = p_width;
	line->antialiased = p_antialiased;
	canvas_item->rect_dirty = true;

	canvas_item->commands.push_back(line);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_polyline(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, float p_width, bool p_antialiased) {
	ERR_FAIL_COND(p_points.size() < 2);
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandPolyLine *pline = memnew(Item::CommandPolyLine);
	ERR_FAIL_COND(!pline);

	pline->antialiased = p_antialiased;
	pline->multiline = false;

	if (p_width <= 1) {
		pline->lines = p_points;
		pline->line_colors = p_colors;
		if (pline->line_colors.size() == 0) {
			pline->line_colors.push_back(Color(1, 1, 1, 1));
		} else if (pline->line_colors.size() > 1 && pline->line_colors.size() != pline->lines.size()) {
			pline->line_colors.resize(1);
		}
	} else {
		//make a trianglestrip for drawing the line...
		Vector2 prev_t;
		pline->triangles.resize(p_points.size() * 2);
		if (p_antialiased) {
			pline->lines.resize(p_points.size() * 2);
		}

		if (p_colors.size() == 0) {
			pline->triangle_colors.push_back(Color(1, 1, 1, 1));
			if (p_antialiased) {
				pline->line_colors.push_back(Color(1, 1, 1, 1));
			}
		} else if (p_colors.size() == 1) {
			pline->triangle_colors = p_colors;
			pline->line_colors = p_colors;
		} else {
			if (p_colors.size() != p_points.size()) {
				pline->triangle_colors.push_back(p_colors[0]);
				pline->line_colors.push_back(p_colors[0]);
			} else {
				pline->triangle_colors.resize(pline->triangles.size());
				pline->line_colors.resize(pline->lines.size());
			}
		}

		for (int i = 0; i < p_points.size(); i++) {
			Vector2 t;
			if (i == p_points.size() - 1) {
				t = prev_t;
			} else {
				t = (p_points[i + 1] - p_points[i]).normalized().tangent();
				if (i == 0) {
					prev_t = t;
				}
			}

			Vector2 tangent = ((t + prev_t).normalized()) * p_width * 0.5;

			if (p_antialiased) {
				pline->lines.write[i] = p_points[i] + tangent;
				pline->lines.write[p_points.size() * 2 - i - 1] = p_points[i] - tangent;
				if (pline->line_colors.size() > 1) {
					pline->line_colors.write[i] = p_colors[i];
					pline->line_colors.write[p_points.size() * 2 - i - 1] = p_colors[i];
				}
			}

			pline->triangles.write[i * 2 + 0] = p_points[i] + tangent;
			pline->triangles.write[i * 2 + 1] = p_points[i] - tangent;

			if (pline->triangle_colors.size() > 1) {
				pline->triangle_colors.write[i * 2 + 0] = p_colors[i];
				pline->triangle_colors.write[i * 2 + 1] = p_colors[i];
			}

			prev_t = t;
		}
	}
	canvas_item->rect_dirty = true;
	canvas_item->commands.push_back(pline);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_multiline(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, float p_width, bool p_antialiased) {
	ERR_FAIL_COND(p_points.size() < 2);
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandPolyLine *pline = memnew(Item::CommandPolyLine);
	ERR_FAIL_COND(!pline);

	pline->antialiased = false; //todo
	pline->multiline = true;

	pline->lines = p_points;
	pline->line_colors = p_colors;
	if (pline->line_colors.size() == 0) {
		pline->line_colors.push_back(Color(1, 1, 1, 1));
	} else if (pline->line_colors.size() > 1 && pline->line_colors.size() != pline->lines.size()) {
		pline->line_colors.resize(1);
	}

	canvas_item->rect_dirty = true;
	canvas_item->commands.push_back(pline);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_rect(RID p_item, const Rect2 &p_rect, const Color &p_color) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandRect *rect = memnew(Item::CommandRect);
	ERR_FAIL_COND(!rect);
	rect->modulate = p_color;
	rect->rect = p_rect;
	canvas_item->rect_dirty = true;

	canvas_item->commands.push_back(rect);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_circle(RID p_item, const Point2 &p_pos, float p_radius, const Color &p_color) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandCircle *circle = memnew(Item::CommandCircle);
	ERR_FAIL_COND(!circle);
	circle->color = p_color;
	circle->pos = p_pos;
	circle->radius = p_radius;

	canvas_item->commands.push_back(circle);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_texture_rect(RID p_item, const Rect2 &p_rect, RID p_texture, bool p_tile, const Color &p_modulate, bool p_transpose, RID p_normal_map) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandRect *rect = memnew(Item::CommandRect);
	ERR_FAIL_COND(!rect);
	rect->modulate = p_modulate;
	rect->rect = p_rect;
	rect->flags = 0;
	if (p_tile) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_TILE;
		rect->flags |= RasterizerCanvas::CANVAS_RECT_REGION;
		rect->source = Rect2(0, 0, fabsf(p_rect.size.width), fabsf(p_rect.size.height));
	}

	if (p_rect.size.x < 0) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_FLIP_H;
		rect->rect.size.x = -rect->rect.size.x;
	}
	if (p_rect.size.y < 0) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_FLIP_V;
		rect->rect.size.y = -rect->rect.size.y;
	}
	if (p_transpose) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_TRANSPOSE;
		SWAP(rect->rect.size.x, rect->rect.size.y);
	}
	rect->texture = p_texture;
	rect->normal_map = p_normal_map;
	canvas_item->rect_dirty = true;
	canvas_item->commands.push_back(rect);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_texture_multirect_region(RID p_item, const Vector<Rect2> &p_rects, RID p_texture, const Vector<Rect2> &p_src_rects, const Color &p_modulate, uint32_t p_canvas_rect_flags, RID p_normal_map) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);
	ERR_FAIL_COND(p_rects.size() != p_src_rects.size());
	ERR_FAIL_COND(!p_rects.size());

	Item::CommandMultiRect *rect = memnew(Item::CommandMultiRect);
	ERR_FAIL_COND(!rect);
	rect->modulate = p_modulate;
	rect->texture = p_texture;
	rect->normal_map = p_normal_map;

	// Rects should have flips and transposes pre-applied, and the relevant
	// flags added to p_canvas_rect_flags.
	// A single Multirect should contain rects ALL of the same flag type.
	// The idea is to simplify the renderer as much as possible, and push the complexity
	// to the one off creation code.
	rect->flags = p_canvas_rect_flags | RasterizerCanvas::CANVAS_RECT_REGION;

	rect->rects = p_rects;
	rect->sources = p_src_rects;

	canvas_item->rect_dirty = true;
	canvas_item->commands.push_back(rect);
}

void RenderingServerCanvas::canvas_item_add_texture_rect_region(RID p_item, const Rect2 &p_rect, RID p_texture, const Rect2 &p_src_rect, const Color &p_modulate, bool p_transpose, RID p_normal_map, bool p_clip_uv) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandRect *rect = memnew(Item::CommandRect);
	ERR_FAIL_COND(!rect);
	rect->modulate = p_modulate;
	rect->rect = p_rect;
	rect->texture = p_texture;
	rect->normal_map = p_normal_map;
	rect->source = p_src_rect;
	rect->flags = RasterizerCanvas::CANVAS_RECT_REGION;

	if (p_rect.size.x < 0) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_FLIP_H;
		rect->rect.size.x = -rect->rect.size.x;
	}
	if (p_src_rect.size.x < 0) {
		rect->flags ^= RasterizerCanvas::CANVAS_RECT_FLIP_H;
		rect->source.size.x = -rect->source.size.x;
	}
	if (p_rect.size.y < 0) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_FLIP_V;
		rect->rect.size.y = -rect->rect.size.y;
	}
	if (p_src_rect.size.y < 0) {
		rect->flags ^= RasterizerCanvas::CANVAS_RECT_FLIP_V;
		rect->source.size.y = -rect->source.size.y;
	}

	if (p_transpose) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_TRANSPOSE;
		SWAP(rect->rect.size.x, rect->rect.size.y);
	}

	if (p_clip_uv) {
		rect->flags |= RasterizerCanvas::CANVAS_RECT_CLIP_UV;
	}

	canvas_item->rect_dirty = true;

	canvas_item->commands.push_back(rect);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_nine_patch(RID p_item, const Rect2 &p_rect, const Rect2 &p_source, RID p_texture, const Vector2 &p_topleft, const Vector2 &p_bottomright, RS::NinePatchAxisMode p_x_axis_mode, RS::NinePatchAxisMode p_y_axis_mode, bool p_draw_center, const Color &p_modulate, RID p_normal_map) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandNinePatch *style = memnew(Item::CommandNinePatch);
	ERR_FAIL_COND(!style);
	style->texture = p_texture;
	style->normal_map = p_normal_map;
	style->rect = p_rect;
	style->source = p_source;
	style->draw_center = p_draw_center;
	style->color = p_modulate;
	style->margin[MARGIN_LEFT] = p_topleft.x;
	style->margin[MARGIN_TOP] = p_topleft.y;
	style->margin[MARGIN_RIGHT] = p_bottomright.x;
	style->margin[MARGIN_BOTTOM] = p_bottomright.y;
	style->axis_x = p_x_axis_mode;
	style->axis_y = p_y_axis_mode;
	canvas_item->rect_dirty = true;

	canvas_item->commands.push_back(style);
	_make_bound_dirty(canvas_item);
}
void RenderingServerCanvas::canvas_item_add_primitive(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs, RID p_texture, float p_width, RID p_normal_map) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandPrimitive *prim = memnew(Item::CommandPrimitive);
	ERR_FAIL_COND(!prim);
	prim->texture = p_texture;
	prim->normal_map = p_normal_map;
	prim->points = p_points;
	prim->uvs = p_uvs;
	prim->colors = p_colors;
	prim->width = p_width;
	canvas_item->rect_dirty = true;

	canvas_item->commands.push_back(prim);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_polygon(RID p_item, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs, RID p_texture, RID p_normal_map, bool p_antialiased) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);
#ifdef DEBUG_ENABLED
	int pointcount = p_points.size();
	ERR_FAIL_COND(pointcount < 3);
	int color_size = p_colors.size();
	int uv_size = p_uvs.size();
	ERR_FAIL_COND(color_size != 0 && color_size != 1 && color_size != pointcount);
	ERR_FAIL_COND(uv_size != 0 && (uv_size != pointcount));
#endif
	Vector<int> indices = Geometry::triangulate_polygon(p_points);
	ERR_FAIL_COND_MSG(indices.empty(), "Invalid polygon data, triangulation failed.");

	Item::CommandPolygon *polygon = memnew(Item::CommandPolygon);
	ERR_FAIL_COND(!polygon);
	polygon->texture = p_texture;
	polygon->normal_map = p_normal_map;
	polygon->points = p_points;
	polygon->uvs = p_uvs;
	polygon->colors = p_colors;
	polygon->indices = indices;
	polygon->count = indices.size();
	polygon->antialiased = p_antialiased;
	polygon->antialiasing_use_indices = false;
	canvas_item->rect_dirty = true;

	canvas_item->commands.push_back(polygon);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_triangle_array(RID p_item, const Vector<int> &p_indices, const Vector<Point2> &p_points, const Vector<Color> &p_colors, const Vector<Point2> &p_uvs, const Vector<int> &p_bones, const Vector<float> &p_weights, RID p_texture, int p_count, RID p_normal_map, bool p_antialiased, bool p_antialiasing_use_indices) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	int vertex_count = p_points.size();
	ERR_FAIL_COND(vertex_count == 0);
	ERR_FAIL_COND(!p_colors.empty() && p_colors.size() != vertex_count && p_colors.size() != 1);
	ERR_FAIL_COND(!p_uvs.empty() && p_uvs.size() != vertex_count);
	ERR_FAIL_COND(!p_bones.empty() && p_bones.size() != vertex_count * 4);
	ERR_FAIL_COND(!p_weights.empty() && p_weights.size() != vertex_count * 4);

	const Vector<int> &indices = p_indices;

	int count = p_count * 3;

	if (indices.empty()) {
		ERR_FAIL_COND(vertex_count % 3 != 0);
		if (p_count == -1) {
			count = vertex_count;
		}
	} else {
		ERR_FAIL_COND(indices.size() % 3 != 0);
		if (p_count == -1) {
			count = indices.size();
		}
	}

	Item::CommandPolygon *polygon = memnew(Item::CommandPolygon);
	ERR_FAIL_COND(!polygon);
	polygon->texture = p_texture;
	polygon->normal_map = p_normal_map;
	polygon->points = p_points;
	polygon->uvs = p_uvs;
	polygon->colors = p_colors;
	polygon->bones = p_bones;
	polygon->weights = p_weights;
	polygon->indices = indices;
	polygon->count = count;
	polygon->antialiased = p_antialiased;
	polygon->antialiasing_use_indices = p_antialiasing_use_indices;
	canvas_item->rect_dirty = true;

	canvas_item->commands.push_back(polygon);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_set_transform(RID p_item, const Transform2D &p_transform) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandTransform *tr = memnew(Item::CommandTransform);
	ERR_FAIL_COND(!tr);
	tr->xform = p_transform;

	canvas_item->commands.push_back(tr);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_mesh(RID p_item, const RID &p_mesh, const Transform2D &p_transform, const Color &p_modulate, RID p_texture, RID p_normal_map) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandMesh *m = memnew(Item::CommandMesh);
	ERR_FAIL_COND(!m);
	m->mesh = p_mesh;
	m->texture = p_texture;
	m->normal_map = p_normal_map;
	m->transform = p_transform;
	m->modulate = p_modulate;

	canvas_item->commands.push_back(m);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_add_multimesh(RID p_item, RID p_mesh, RID p_texture, RID p_normal_map) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandMultiMesh *mm = memnew(Item::CommandMultiMesh);
	ERR_FAIL_COND(!mm);
	mm->multimesh = p_mesh;
	mm->texture = p_texture;
	mm->normal_map = p_normal_map;
	mm->canvas_item = p_item;

	canvas_item->rect_dirty = true;
	canvas_item->commands.push_back(mm);
	_make_bound_dirty(canvas_item);

	// Attach to multimesh a backlink to enable updating
	// the canvas item local bound when the multimesh changes.
	if (p_mesh.is_valid()) {
		RSG::storage->multimesh_attach_canvas_item(p_mesh, p_item, true);
	}
}

void RenderingServerCanvas::canvas_item_add_clip_ignore(RID p_item, bool p_ignore) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	Item::CommandClipIgnore *ci = memnew(Item::CommandClipIgnore);
	ERR_FAIL_COND(!ci);
	ci->ignore = p_ignore;

	canvas_item->commands.push_back(ci);
	_make_bound_dirty(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_sort_children_by_y(RID p_item, bool p_enable) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->sort_y = p_enable;

	_mark_ysort_dirty(canvas_item, canvas_item_owner);
	_check_bound_integrity(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_z_index(RID p_item, int p_z) {
	ERR_FAIL_COND(p_z < RS::CANVAS_ITEM_Z_MIN || p_z > RS::CANVAS_ITEM_Z_MAX);

	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->z_index = p_z;
	_check_bound_integrity(canvas_item);
}
void RenderingServerCanvas::canvas_item_set_z_as_relative_to_parent(RID p_item, bool p_enable) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->z_relative = p_enable;
	_check_bound_integrity(canvas_item);
}

Rect2 RenderingServerCanvas::_debug_canvas_item_get_rect(RID p_item) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND_V(!canvas_item, Rect2());
	return canvas_item->get_rect();
}

Rect2 RenderingServerCanvas::_debug_canvas_item_get_local_bound(RID p_item) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND_V(!canvas_item, Rect2());
	return canvas_item->local_bound;
}

void RenderingServerCanvas::canvas_item_set_skeleton_relative_xform(RID p_item, Transform2D p_relative_xform) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	if (!canvas_item->skinning_data) {
		canvas_item->skinning_data = memnew(Item::SkinningData);
	}
	canvas_item->skinning_data->skeleton_relative_xform = p_relative_xform;
	canvas_item->skinning_data->skeleton_relative_xform_inv = p_relative_xform.affine_inverse();

	// Set any Polygon2Ds pre-calced bone bounds to dirty.
	for (int n = 0; n < canvas_item->commands.size(); n++) {
		Item::Command *c = canvas_item->commands[n];
		if (c->type == Item::Command::TYPE_POLYGON) {
			Item::CommandPolygon *polygon = static_cast<Item::CommandPolygon *>(c);

			// Make sure skinning data is present.
			if (!polygon->skinning_data) {
				polygon->skinning_data = memnew(Item::CommandPolygon::SkinningData);
			}

			polygon->skinning_data->dirty = true;
		}
	}
}

void RenderingServerCanvas::canvas_item_attach_skeleton(RID p_item, RID p_skeleton) {
}

// Canvas items may contain references to other resources (such as MultiMesh).
// If the resources are deleted first, and the canvas_item retains references, it
// will crash / error when it tries to access these.
void RenderingServerCanvas::_canvas_item_remove_references(RID p_item, RID p_rid) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);
	canvas_item->remove_references(p_rid);
}

void RenderingServerCanvas::_canvas_item_invalidate_local_bound(RID p_item) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_copy_to_backbuffer(RID p_item, bool p_enable, const Rect2 &p_rect) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);
	if (bool(canvas_item->copy_back_buffer != nullptr) != p_enable) {
		if (p_enable) {
			canvas_item->copy_back_buffer = memnew(RasterizerCanvas::Item::CopyBackBuffer);
		} else {
			memdelete(canvas_item->copy_back_buffer);
			canvas_item->copy_back_buffer = nullptr;
		}
	}

	if (p_enable) {
		canvas_item->copy_back_buffer->rect = p_rect;
		canvas_item->copy_back_buffer->full = p_rect == Rect2();
	}
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_clear(RID p_item) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	_make_bound_dirty(canvas_item);
	canvas_item->clear();
}
void RenderingServerCanvas::canvas_item_set_draw_index(RID p_item, int p_index) {
	Item *canvas_item = canvas_item_owner.getornull(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->index = p_index;

	if (canvas_item_owner.owns(canvas_item->parent)) {
		Item *canvas_item_parent = canvas_item_owner.getornull(canvas_item->parent);
		canvas_item_parent->children_order_dirty = true;
		return;
	}

	Canvas *canvas = canvas_owner.getornull(canvas_item->parent);
	if (canvas) {
		canvas->children_order_dirty = true;
		return;
	}

	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_material(RID p_item, RID p_material) {
	Item *canvas_item = canvas_item_owner.get(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->material = p_material;
	_make_bound_dirty(canvas_item);
}

void RenderingServerCanvas::canvas_item_set_use_parent_material(RID p_item, bool p_enable) {
	Item *canvas_item = canvas_item_owner.get(p_item);
	ERR_FAIL_COND(!canvas_item);

	canvas_item->use_parent_material = p_enable;
	_make_bound_dirty(canvas_item);
}

bool RenderingServerCanvas::free(RID p_rid) {
	if (canvas_owner.owns(p_rid)) {
		Canvas *canvas = canvas_owner.get(p_rid);
		ERR_FAIL_COND_V(!canvas, false);

		while (canvas->viewports.size()) {
			RenderingServerViewport::Viewport *vp = RSG::viewport->viewport_owner.get(canvas->viewports.front()->get());
			ERR_FAIL_COND_V(!vp, true);

			RBMap<RID, RenderingServerViewport::Viewport::CanvasData>::Element *E = vp->canvas_map.find(p_rid);
			ERR_FAIL_COND_V(!E, true);
			vp->canvas_map.erase(p_rid);

			canvas->viewports.erase(canvas->viewports.front());
		}

		for (int i = 0; i < canvas->child_items.size(); i++) {
			canvas->child_items[i].item->parent = RID();
		}

		canvas_owner.free(p_rid);

		memdelete(canvas);

	} else if (canvas_item_owner.owns(p_rid)) {
		Item *canvas_item = canvas_item_owner.get(p_rid);
		ERR_FAIL_COND_V(!canvas_item, true);
		_make_bound_dirty(canvas_item);

		if (canvas_item->parent.is_valid()) {
			if (canvas_owner.owns(canvas_item->parent)) {
				Canvas *canvas = canvas_owner.get(canvas_item->parent);
				canvas->erase_item(canvas_item);
			} else if (canvas_item_owner.owns(canvas_item->parent)) {
				Item *item_owner = canvas_item_owner.get(canvas_item->parent);
				item_owner->child_items.erase(canvas_item);

				if (item_owner->sort_y) {
					_mark_ysort_dirty(item_owner, canvas_item_owner);
				}
				_check_bound_integrity(item_owner);
			}
		}

		for (int i = 0; i < canvas_item->child_items.size(); i++) {
			canvas_item->child_items[i]->parent = RID();
		}

		/*
		if (canvas_item->material) {
			canvas_item->material->owners.erase(canvas_item);
		}
		*/

		canvas_item_owner.free(p_rid);

		memdelete(canvas_item);

	} else {
		return false;
	}

	return true;
}

#ifdef RENDERING_SERVER_CANVAS_CHECK_BOUNDS
// Debugging function to check that the bound dirty flags in the tree make sense.
// Any item that has is dirty, all parents should be dirty up to the root
// (except in hidden branches, which are not kept track of for performance reasons).
bool RenderingServerCanvas::_check_bound_integrity(const Item *p_item) {
	while (p_item) {
		if (canvas_item_owner.owns(p_item->parent)) {
			p_item = canvas_item_owner.get(p_item->parent);
		} else {
			return _check_bound_integrity_down(p_item, p_item->bound_dirty);
		}
	}

	return true;
}

bool RenderingServerCanvas::_check_bound_integrity_down(const Item *p_item, bool p_bound_dirty) {
	// don't care about integrity into invisible branches
	if (!p_item->visible) {
		return true;
	}

	if (p_item->bound_dirty) {
		if (!p_bound_dirty) {
			_print_tree(p_item);
			ERR_PRINT("bound integrity check failed");
			return false;
		}
	}

	// go through children
	int child_item_count = p_item->child_items.size();
	Item *const *child_items = p_item->child_items.ptr();

	for (int n = 0; n < child_item_count; n++) {
		if (!_check_bound_integrity_down(child_items[n], p_bound_dirty)) {
			return false;
		}
	}
	return true;
}

void RenderingServerCanvas::_print_tree(const Item *p_item) {
	const Item *highlight = p_item;

	while (p_item) {
		if (canvas_item_owner.owns(p_item->parent)) {
			p_item = canvas_item_owner.get(p_item->parent);
		} else {
			_print_tree_down(0, 0, p_item, highlight);
			return;
		}
	}
}

void RenderingServerCanvas::_print_tree_down(int p_child_id, int p_depth, const Item *p_item, const Item *p_highlight, bool p_hidden) {
	String sz;
	for (int n = 0; n < p_depth; n++) {
		sz += "\t";
	}
	if (p_item == p_highlight) {
		sz += "* ";
	}
	sz += itos(p_child_id) + " ";
#ifdef RENDERING_SERVER_CANVAS_DEBUG_ITEM_NAMES
	sz += p_item->name + "\t";
#endif
	sz += String(Variant(p_item->global_rect_cache)) + " ";

	if (!p_item->visible) {
		sz += "(H) ";
		p_hidden = true;
	} else if (p_hidden) {
		sz += "(HI) ";
	}

	if (p_item->bound_dirty) {
		sz += "(dirty) ";
	}

	if (p_item->parent == RID()) {
		sz += "(parent NULL) ";
	}

	print_line(sz);

	// go through children
	int child_item_count = p_item->child_items.size();
	Item *const *child_items = p_item->child_items.ptr();

	for (int n = 0; n < child_item_count; n++) {
		_print_tree_down(n, p_depth + 1, child_items[n], p_highlight, p_hidden);
	}
}

#endif

void RenderingServerCanvas::tick() {
	if (_interpolation_data.interpolation_enabled) {
		update_interpolation_tick(true);
	}
}

void RenderingServerCanvas::update_interpolation_tick(bool p_process) {
#define PANDEMONIUM_UPDATE_INTERPOLATION_TICK(LIST_PREV, LIST_CURR, TYPE, OWNER_LIST)        \
	/* Detect any that were on the previous transform list that are no longer active. */     \
	for (unsigned int n = 0; n < _interpolation_data.LIST_PREV->size(); n++) {               \
		const RID &rid = (*_interpolation_data.LIST_PREV)[n];                                \
		TYPE *item = OWNER_LIST.getornull(rid);                                              \
		/* no longer active? (either the instance deleted or no longer being transformed) */ \
		if (item && !item->on_interpolate_transform_list) {                                  \
			item->xform_prev = item->xform_curr;                                             \
		}                                                                                    \
	}                                                                                        \
	/* and now for any in the transform list (being actively interpolated), */               \
	/* keep the previous transform value up to date and ready for next tick */               \
	if (p_process) {                                                                         \
		for (unsigned int n = 0; n < _interpolation_data.LIST_CURR->size(); n++) {           \
			const RID &rid = (*_interpolation_data.LIST_CURR)[n];                            \
			TYPE *item = OWNER_LIST.getornull(rid);                                          \
			if (item) {                                                                      \
				item->xform_prev = item->xform_curr;                                         \
				item->on_interpolate_transform_list = false;                                 \
			}                                                                                \
		}                                                                                    \
	}                                                                                        \
	SWAP(_interpolation_data.LIST_CURR, _interpolation_data.LIST_PREV);                      \
	_interpolation_data.LIST_CURR->clear();

	PANDEMONIUM_UPDATE_INTERPOLATION_TICK(canvas_item_transform_update_list_prev, canvas_item_transform_update_list_curr, Item, canvas_item_owner);

#undef PANDEMONIUM_UPDATE_INTERPOLATION_TICK
}

RenderingServerCanvas::RenderingServerCanvas() {
	_canvas_cull_mode = CANVAS_CULL_MODE_NODE;

	z_list = (RasterizerCanvas::Item **)memalloc(z_range * sizeof(RasterizerCanvas::Item *));
	z_last_list = (RasterizerCanvas::Item **)memalloc(z_range * sizeof(RasterizerCanvas::Item *));

	disable_scale = false;

	int mode = GLOBAL_DEF("rendering/2d/options/culling_mode", 1);
	ProjectSettings::get_singleton()->set_custom_property_info("rendering/2d/options/culling_mode", PropertyInfo(Variant::INT, "rendering/2d/options/culling_mode", PROPERTY_HINT_ENUM, "Item,Node"));

	switch (mode) {
		default: {
			_canvas_cull_mode = CANVAS_CULL_MODE_NODE;
		} break;
		case 0: {
			_canvas_cull_mode = CANVAS_CULL_MODE_ITEM;
		} break;
	}
}

RenderingServerCanvas::~RenderingServerCanvas() {
	memfree(z_list);
	memfree(z_last_list);
}