#define SDL_MAIN_HANDLED

#include <iostream>

#include <SDL.h>
#include <SDL_ttf.h>
#include <SDL_mixer.h>
#include <SDL_image.h>
#include <SDL2_gfxPrimitives.h>

int main()
{

	SDL_Init(SDL_INIT_EVERYTHING);
	IMG_Init(IMG_INIT_JPG | IMG_INIT_PNG);
	Mix_Init(MIX_INIT_MP3);
	TTF_Init();

	Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 2048);

//创建窗口和与之关联渲染器
	SDL_Window* window = SDL_CreateWindow(u8"你好，世界 ", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_SHOWN);
	SDL_Renderer* renderer = SDL_CreateRenderer(window,-1,SDL_RENDERER_ACCELERATED);

//加载图像并创建纹理
	SDL_Surface* suf_img = IMG_Load("avatar.jpg");
	SDL_Texture* tex_img = SDL_CreateTextureFromSurface(renderer,suf_img);

	TTF_Font* font = TTF_OpenFont("ipix.ttf", 32);
	SDL_Color color = { 255,255,255,255 };
	SDL_Surface* suf_text = TTF_RenderUTF8_Blended(font, u8"你好，世界", color);
	SDL_Texture* tex_text = SDL_CreateTextureFromSurface(renderer, suf_text);

	Mix_Music* music = Mix_LoadMUS("music.mp3");
	Mix_FadeInMusic(music, -1, 1500);

	int fps = 60;

	bool is_quit = false;

	SDL_Event event;
	SDL_Point pos_cursor = { 0,0 };
	SDL_Rect rect_img,rect_text;
	Uint64 last_counter = SDL_GetPerformanceCounter();
	Uint64 counter_freq = SDL_GetPerformanceFrequency();


	rect_img.w = suf_img->w;
	rect_img.h = suf_img->h;

	rect_text.w = suf_text->w;
	rect_text.h = suf_text->h;

	while (!is_quit)
	{
		while (SDL_PollEvent(&event))
		{
			if (event.type == SDL_QUIT)
			{
				is_quit = true;
			}
			else if (event.type == SDL_MOUSEMOTION)
			{
				pos_cursor.x = event.motion.x;
				pos_cursor.y = event.motion.y;
			}
		}

		Uint64 current_counter = SDL_GetPerformanceCounter();
		double delta = (double)(current_counter - last_counter) / counter_freq;
		last_counter = current_counter;
		if (delta * 1000 < 1000.0 / 60)
			SDL_Delay((Uint32)1000.0 / 60 - delta * 1000); 

		//处理数据
		rect_img.x = pos_cursor.x;
		rect_img.y = pos_cursor.y;
		
		rect_text.x = pos_cursor.x;
		rect_text.y = pos_cursor.y;

		SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
		SDL_RenderClear(renderer);//清除渲染器

		//渲染绘图
		SDL_RenderCopy(renderer, tex_img, nullptr, &rect_img);//复制纹理到渲染器
		filledCircleRGBA(renderer, pos_cursor.x, pos_cursor.y, 50, 255, 0, 0, 125);
		SDL_RenderCopy(renderer, tex_text, nullptr, &rect_text);

		SDL_RenderPresent(renderer);//更新屏幕显示

	}	

	return 0; 
}



/**SDL_FreeSurface：释放不再需要的 SDL_Surface。
 SDL_DestroyTexture、SDL_DestroyRenderer 和 SDL_DestroyWindow：销毁纹理、渲染器和窗口。**/