编译使用SDL2.0

SDL2.0 可以支持非英文的输入。 也有第三方的朋友做了一个SDL插件也支持非英文输入。 这里记录一下在尝试过程中遇到一些编译问题。

参照文档写了一个demo

#include "../include/SDL.h"

//The event structure
SDL_Event event;
char text[1024];
SDL_Surface *screen = NULL;
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

#include <string>

std::string composition;
int cursor;
int selection_len = 0;


#include "SDL.h"

int main(int argc, char* argv[])
{
    SDL_Window* window;
    SDL_Renderer* renderer;

    // Initialize SDL.
    if (SDL_Init(SDL_INIT_VIDEO) < 0)
            return 1;

    // Create the window where we will draw.
    window = SDL_CreateWindow("SDL_RenderClear",
                    SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
                    512, 512,
                    SDL_WINDOW_SHOWN);

    // We must call SDL_CreateRenderer in order for draw calls to affect this window.
    renderer = SDL_CreateRenderer(window, -1, 0);

    // Select the color for drawing. It is set to red here.
    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);

    // Clear the entire screen to our selected color.
    SDL_RenderClear(renderer);

    // Up until now everything was drawn behind the scenes.
    // This will show the new, red contents of the window.
    SDL_RenderPresent(renderer);

	SDL_StartTextInput();
	
    while (true)
    {
        if (SDL_PollEvent(&event))
        {
            switch (event.type)
            {
                case SDL_TEXTINPUT:
                    /* Add new text onto the end of our text */
                    strcat(text, event.text.text);
                    break;
                case SDL_TEXTEDITING:
                    /*
                    Update the composition text.
                    Update the cursor position.
                    Update the selection length (if any).
                    */
                    composition = event.edit.text;
                    cursor = event.edit.start;
                    selection_len = event.edit.length;
                    break;
            }
        }

    }
    // Give us time to see the window.
    SDL_Delay(1000);

    // Always be sure to clean up
    SDL_Quit();
    return 0;
}

Makefile 这样写的

all:
	g++ -g testime.cpp -I/home/zhuzhonghua/work/SDL/include /home/zhuzhonghua/work/SDL/build/.libs/libSDL2.a /home/zhuzhonghua/work/SDL/build/libSDL2main.a -lpthread -lGL -lGLU -lm -L/usr/lib/x86_64-linux-gnu -lrt -ldl

demo写的有问题，需要写一个退出函数，要不然总是关不掉。

本人喜欢静态编译，所以就全部使用的.a文件。

刚开始编译时会遇到dlsym undefined reference 的问题，加上-ldl选项就OK了。

遇到clock_gettime undefined reference，那么加上-lrt的选项，就OK 了。