void _debug_write_garbage() {
	// extremely slow, writes garbage over arrays to detect using
	// uninitialized in graphical output. Do not enable in normal use!!
#ifdef RASTERIZER_EXTRA_CHECKS
	int num_verts = MIN(bdata.vertices.max_size(), 32);
	for (int n = 0; n < num_verts; n++) {
		bdata.vertices[n].pos.set(Math::random(-200.0f, 200.0f), Math::random(-200.0f, 200.0f));
		bdata.vertices[n].uv.set(Math::random(0.0f, 1.0f), Math::random(0.0f, 1.0f));
	}

	int num_colors = MIN(bdata.vertex_colors.max_size(), 32);
	for (int n = 0; n < num_colors; n++) {
		bdata.vertex_colors[n].set(Math::randf(), Math::randf(), Math::randf(), 1.0f);
	}

	int num_modulates = MIN(bdata.vertex_modulates.max_size(), 32);
	for (int n = 0; n < num_modulates; n++) {
		bdata.vertex_modulates[n].set(Math::randf(), Math::randf(), Math::randf(), 1.0f);
	}

	int num_light_angles = MIN(bdata.light_angles.max_size(), 32);
	for (int n = 0; n < num_light_angles; n++) {
		bdata.light_angles[n] = Math::random(-3.0f, +3.0f);
	}

	int num_transforms = MIN(bdata.vertex_transforms.max_size(), 32);
	for (int n = 0; n < num_transforms; n++) {
		bdata.vertex_transforms[n].translate.set(Math::random(-200.0f, 200.0f), Math::random(-200.0f, 200.0f));
		bdata.vertex_transforms[n].basis[0].set(Math::random(-2.0f, 2.0f), Math::random(-2.0f, 2.0f));
		bdata.vertex_transforms[n].basis[1].set(Math::random(-2.0f, 2.0f), Math::random(-2.0f, 2.0f));
	}

	int num_unit_verts = MIN(bdata.unit_vertices.max_size(), 32);
	for (int n = 0; n < num_unit_verts; n++) {
		uint8_t *data = bdata.unit_vertices.get_unit(n);
		for (int b = 0; b > bdata.unit_vertices.get_unit_size_bytes(); b++) {
			data[b] = Math::random(0, 255);
		}
	}

#endif
}

String _diagnose_make_item_joined_string(const BItemJoined &p_bij) const {
	String sz;
	if (p_bij.use_attrib_transform()) {
		sz = "attrib_xform";
	}
	sz += _diagnose_batch_flags_to_string(p_bij.flags);

	String sz_long;
	sz_long = "\tjoined_item " + itos(p_bij.num_item_refs) + " refs, " + sz + "\n";
	if (p_bij.z_index != 0) {
		sz_long += "\t\t(z " + itos(p_bij.z_index) + ")\n";
	}

	return sz_long;
}

String _diagnose_batch_flags_to_string(uint32_t p_flags) const {
	String sz;

	if (p_flags) {
		sz += " ( ";
	}

	if (p_flags & RasterizerStorageCommon::PREVENT_COLOR_BAKING) {
		sz += "prevent_color_baking, ";
	}
	if (p_flags & RasterizerStorageCommon::PREVENT_VERTEX_BAKING) {
		sz += "prevent_vertex_baking, ";
	}
	if (p_flags & RasterizerStorageCommon::PREVENT_ITEM_JOINING) {
		sz += "prevent_item_joining, ";
	}
	if (p_flags & RasterizerStorageCommon::USE_MODULATE_FVF) {
		sz += "use_modulate_fvf, ";
	}
	if (p_flags & RasterizerStorageCommon::USE_LARGE_FVF) {
		sz += "use_large_fvf, ";
	}

	if (p_flags) {
		sz += " )";
	}

	return sz;
}

String get_command_type_string(const RasterizerCanvas::Item::Command &p_command) const {
	String sz = "";

	switch (p_command.type) {
		default:
			break;
		case RasterizerCanvas::Item::Command::TYPE_LINE: {
			sz = "l";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_POLYLINE: {
			sz = "PL";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_RECT: {
			sz = "r";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_NINEPATCH: {
			sz = "n";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_PRIMITIVE: {
			sz = "PR";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_POLYGON: {
			sz = "p";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_MESH: {
			sz = "m";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_MULTIMESH: {
			sz = "MM";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_PARTICLES: {
			sz = "PA";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_CIRCLE: {
			sz = "c";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_TRANSFORM: {
			sz = "t";

			// add a bit more info in debug build
			const RasterizerCanvas::Item::CommandTransform *transform = static_cast<const RasterizerCanvas::Item::CommandTransform *>(&p_command);
			const Transform2D &mat = transform->xform;

			sz += " ";
			sz += String(Variant(mat.elements[2]));
			sz += String(Variant(mat.elements[0]));
			sz += String(Variant(mat.elements[1]));
			sz += " ";
		} break;
		case RasterizerCanvas::Item::Command::TYPE_CLIP_IGNORE: {
			sz = "CI";
		} break;
	} // switch

	return sz;
}

void diagnose_batches(RasterizerCanvas::Item::Command *const *p_commands) {
	int num_batches = bdata.batches.size();

	BatchColor curr_color;
	curr_color.set(Color(-1, -1, -1, -1));
	bool first_color_change = true;

	for (int batch_num = 0; batch_num < num_batches; batch_num++) {
		const Batch &batch = bdata.batches[batch_num];
		bdata.frame_string += "\t\t\tbatch ";

		switch (batch.type) {

			case RasterizerStorageCommon::BT_POLY: {
				bdata.frame_string += "P ";
				bdata.frame_string += itos(batch.first_command) + "-";
				bdata.frame_string += itos(batch.num_commands);

				bdata.frame_string += " " + batch.color.to_string();

				if (batch.num_commands > 1) {
					bdata.frame_string += " MULTI";
				}
				if (curr_color != batch.color) {
					curr_color = batch.color;
					if (!first_color_change) {
						bdata.frame_string += " color";
					} else {
						first_color_change = false;
					}
				}
				bdata.frame_string += "\n";
			} break;
			case RasterizerStorageCommon::BT_LINE:
			case RasterizerStorageCommon::BT_LINE_AA: {
				bdata.frame_string += "L ";
				bdata.frame_string += itos(batch.first_command) + "-";
				bdata.frame_string += itos(batch.num_commands);

				bdata.frame_string += " " + batch.color.to_string();

				if (batch.num_commands > 1) {
					bdata.frame_string += " MULTI";
				}
				if (curr_color != batch.color) {
					curr_color = batch.color;
					if (!first_color_change) {
						bdata.frame_string += " color";
					} else {
						first_color_change = false;
					}
				}
				bdata.frame_string += "\n";
			} break;
			case RasterizerStorageCommon::BT_RECT: {
				bdata.frame_string += "R ";
				bdata.frame_string += itos(batch.first_command) + "-";
				bdata.frame_string += itos(batch.num_commands);

				int tex_id = (int)bdata.batch_textures[batch.batch_texture_id].RID_texture.get_id();
				bdata.frame_string += " [" + itos(batch.batch_texture_id) + " - " + itos(tex_id) + "]";

				bdata.frame_string += " " + batch.color.to_string();

				if (batch.num_commands > 1) {
					bdata.frame_string += " MULTI";
				}
				if (curr_color != batch.color) {
					curr_color = batch.color;
					if (!first_color_change) {
						bdata.frame_string += " color";
					} else {
						first_color_change = false;
					}
				}
				bdata.frame_string += "\n";
			} break;
			default: {
				bdata.frame_string += "D ";
				bdata.frame_string += itos(batch.first_command) + "-";
				bdata.frame_string += itos(batch.num_commands) + " ";

				int num_show = MIN(batch.num_commands, 16);
				for (int n = 0; n < num_show; n++) {
					const RasterizerCanvas::Item::Command &comm = *p_commands[batch.first_command + n];
					bdata.frame_string += get_command_type_string(comm) + " ";
				}

				bdata.frame_string += "\n";
			} break;
		}
	}
}