官术网_书友最值得收藏!

Immediate mode versus retained mode

Immediate mode is frequently thought of as the opposite of retained mode, but, in practice, when we write code for an immediate mode system, we may build on top of an API that gives us some of the functionality of a retained mode library. Immediate mode forces the developer to do all or most of the heavy lifting done by a retained mode library. We, as developers, are forced to manage our scene graph, and understand what graphical objects we need to render and how and when those objects must render. In short, it is a lot more work, but if done well, the payoff is a game that will render much faster than what is possible to render using the DOM.

You might be asking yourself right now: How do I go about using this Immediate Mode thingy? Enter the HTML5 Canvas! In 2004, Apple Inc. developed the canvas element as an immediate mode display tag for Apple's proprietary browser technology. The canvas partitions off a section of our web page, which allows us to render to that area using immediate mode rendering. That will enable us to render to a part of the DOM (the canvas) without requiring the browser to recalculate the position of all the elements from within the DOM. That allows the browser to optimize the rendering of the canvas further, using the computer's Graphical Processing Unit (GPU).

主站蜘蛛池模板: 庆阳市| 丰原市| 陇川县| 常熟市| 科技| 和静县| 朔州市| 固镇县| 三门县| 泽库县| 白水县| 湘潭市| 化隆| 灌南县| 凤城市| 临江市| 玉龙| 泰安市| 安仁县| 龙胜| 澄迈县| 高雄县| 沙河市| 清远市| 奉节县| 阜平县| 吴江市| 绍兴县| 馆陶县| 全州县| 华坪县| 安泽县| 巴林右旗| 民县| 什邡市| 大兴区| 嘉定区| 筠连县| 昭通市| 攀枝花市| 疏勒县|