2D 引擎通过硬件在 OpenGL 上滚动？
我使用 OpenGL 作为 2D 平铺引擎的底端。 当一切都是二维时，优化某些问题就很简单。 例如，滚动。如果我知道屏幕的某个部分 需要从底部滚动，然后我可以直接跳过该部分。 我晚上一次移动超过 1 个像素。没有显式硬件 支持（想想旧的任天堂硬件），这需要大量的像素写入。一个 芯片上的 bitblt 将是下一个最好的选择。
本质上，我正在研究如何优化我的 GL 调用以使用 VRAM 纹理渲染为高效的硬件位块传送。
是否可以让 GL 滚动帧缓冲区，或者我应该只是 屈服于双缓冲并重新渲染整个场景 对于每一帧？
谢谢
I'm using OpenGL as the bottom end for a 2D tiling engine.
When everything is 2D, it is simple to optimize certain issues.
For example, scrolling. If I know a certain section of the screen
needs to scroll off the bottom, then I can just blit over that portion.
I'm evening moving more than 1 pixel at a time. Without explicit hardware
support (think old nintendo hw), this requires a lot of pixel writes. An
on chip bitblt would be the next best thing.
Essentially, I'm looking at how I can optimize my GL calls to use
VRAM texture renders as efficient hardware blits.
Is it possible to have GL scroll the framebuffer, or should I just
resign myself to double-buffering and re-rendering an entire scene
for each frame?
Thx
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我不知道你将如何解决，至少，每帧都使用纹理进行全屏矩形渲染（当它实际滚动时）。我有一段时间没有看到在显卡上移动帧缓冲区指针的功能了。
但是，您可以限制渲染每帧所需的场景量。如果将滚动场景保留为纹理，则可以绑定到屏幕外帧缓冲区并渲染其无效部分。然后，您只需使用 UV 操作来完成最终的全屏矩形块传输。
I don't see how you will get around, at the very least, doing a fullscreen rect render with a texture every frame (when it's actually scrolling). I haven't seen the ability to move the frame buffer pointer on graphics cards for a while now.
However, you can limit how much of the scene you need to render every frame. If you keep your scrolling scene as a texture, you can bind to an offscreen frame buffer and render over the invalidated part of it. Then, you just use UV manipulation to do your final full screen rectangle blit.