为什么我的SDL2和SDL_RenderCopy在所有像素的双循环中得到不良的性能？

问题描述

我使用SDL2编写一个raycasting游戏。
绘制地板时，我需要按像素方式调用SDL_RenderCopy。这会导致瓶颈，使帧速率降至10 fps以下。
我正在寻找性能提升，但似乎找不到一些。

I am programming a raycasting game using SDL2.When drawing the floor, I need to call SDL_RenderCopy pixelwise. This leads to a bottleneck which drops the framerate below 10 fps.I am looking for performance boosts but can't seem to find some.

这里是性能下降的粗略概述：

Here's a rough overview of the performance drop:

 
You should probably be using texture streaming for this. Basically you will create an SDL_Texture of type SDL_TEXTUREACCESS_STREAMING and then each frame you 'lock' the texture, update the pixels that you require then 'unlock' the texture again. The texture is then rendered in a single SDL_RenderCopy call.
 
 
 LazyFoo示例 -  
   li> 
 
探索银河 -  
  
 
 
LazyFoo Example -http://lazyfoo.net/tutorials/SDL/42_texture_streaming/index.php
Exploring Galaxy -http://slouken.blogspot.co.uk/2011/02/streaming-textures-with-sdl-13.html
除了调用 SDL_RenderCopy  480,000次的帧总是会杀死你的帧率。
Other than that calling SDL_RenderCopy 480,000 times a frame is always going to kill your framerate.
                        
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