這裡總結一下個人對sdl的一些函式，方便以後查詢。
v1.0.1
1.視窗：
sdl_init(sdl_init_video);
//建立視窗
sdl_window*window=sdl_createwindow(char*title,int x, int y, int width, int height,0);
//獲取視窗大小
int win_w,win_h;sdl_getwindowsize(window,&win_w,&win_h);
//銷毀視窗
sdl_destroywindow(window);
sdl_quit();
2.渲染器：
//建立
sdl_renderer*renderer=sdl_createrenderer(window,-1,0);
//設定透明度
sdl_setrenderdrawblendmode(renderer,sdl_blendmode_blend);
//清理
sdl_renderclear(renderer);
//重新整理
sdl_renderpresent(renderer);
//銷毀
sdl_destroyrenderer(renderer);
3.載入：
#include
sdl_su***ce*su***ce=img_load(char*file);
4.載入文字：
//文字風格：斜體。另外 ttf_style_bold:粗體，ttf_style_underline:下劃線，ttf_style_strikethrough:刪除線，ttf_strle_normal:正常
ttf_setfontstyle(ttf_font*font, ttf_style_italic);
//退出
ttf_closefont(font);ttf_quit();
5.texture：
//su***ce轉換成texture
sdl_texture*texture=sdl_createtexturefromsuface(sdl_renderer*renderer, sdl_su***ce*su***ce);
//獲取texture的長寬的with,height;
sdl_querytexture(sdl_texture*texture, null, null, &with, &height);
6.su***ce：
//銷毀
sdl_freesu***ce(sdl_su***ce*su***ce);
7.設定su***ce和texture的透明度：
sdl_setsu***ceblendmode(sdl_su***ce*su***ce, sdl_blendmode_blend);
sdl_setsu***cealphamod(sdl_su***ce*su***ce, uint8 alpha);
sdl_settextureblendmode(sdl_texture*texture, sdl_blendmode_blend);
sdl_settexturealphamod(sdl_texture*texture, uint8 alpha);
8.畫畫：
sdl_setrenderdrawcolor(sdl_renderer*renderer, uint8 r,uint8 g, uint8 b, uint8 a); //設定畫筆顏色
sdl_fillrect(sdl_renderer*renderer, sdl_rect*rect); //填充矩形
9.在texture上畫畫：
sdl_texture*texture=sdl_createtexture(sdl_renderer*renderer, sdl_pixelformat_rgba8888, sdl_textureaccess_target, int width, int height);
sdl_setrenderdrawcolor(sdl_renderer*renderer, 255, 255, 255, 0);
sdl_setrendertarget(sdl_renderer*renderer, sdl_texture*texture);
sdl_renderclear(sdl_renderer*renderer);
...//畫畫
sdl_setrendertarget(sdl_renderer*renderer, null);
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