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main.cpp

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+#include <SDL2/SDL.h>
+#include <iostream>
+
+const int ScreenWidth = 1280;
+const int ScreenHeight = 720;
+
+void logSDLError(std::ostream &os, const std::string &msg){
+        os << msg << " error: " << SDL_GetError() << std::endl;
+}
+
+void ApplySurface(int x, int y, SDL_Texture *tex, SDL_Renderer *rend){
+   SDL_Rect pos;
+   pos.x = x;
+   pos.y = y;
+   SDL_QueryTexture(tex, NULL, NULL, &pos.w, &pos.h);
+   SDL_RenderCopy(rend, tex, NULL, &pos);
+}
+
+void renderLoop(SDL_Texture *texture, SDL_Texture *background, SDL_Renderer *renderer, int x, int y) {
+//    ApplySurface(0,0,background,renderer);
+    SDL_RenderCopy(renderer, background, NULL, NULL);
+    ApplySurface(x,y,texture,renderer);
+}
+
+void kbdHandler(bool &quit, int &x, int &y, SDL_Event event)
+{
+    switch (event.key.keysym.sym) {
+    case SDLK_UP:
+        y-=2;
+        break;
+    case SDLK_DOWN:
+        y+=2;
+        break;
+    case SDLK_LEFT:
+        x-=2;
+        break;
+    case SDLK_RIGHT:
+        x+=2;
+        break;
+    case SDLK_ESCAPE:
+        quit = true;
+        break;
+    }
+}
+void physLoop(int &x, int &y, int &dx, int &dy)
+{
+    x += dx;
+    y += dy;
+}
+void loop(SDL_Renderer *renderer, SDL_Texture *cat, SDL_Texture *background){
+    SDL_Event e;
+    bool quit = false;
+    int x = 0, y = 0;
+    while (!quit){
+        int dx = 0, dy = 0;
+        while (SDL_PollEvent(&e)){
+                if (e.type == SDL_QUIT){
+                        quit = true;
+                }
+                if (e.type == SDL_KEYDOWN){
+                    kbdHandler(quit,x,y,e);
+                }
+                if (e.type == SDL_MOUSEBUTTONDOWN){
+                        quit = true;
+                }
+        }
+
+        physLoop(x,y,dx,dy);
+        //Render the scene
+        SDL_RenderClear(renderer);
+        renderLoop(cat, background, renderer, x, y);
+        SDL_RenderPresent(renderer);
+//        SDL_Delay(1000);
+    }
+}
+
+SDL_Texture* loadTexture(const std::string &file, SDL_Renderer *ren){
+        //Initialize to nullptr to avoid dangling pointer issues
+        SDL_Texture *texture = nullptr;
+        //Load the image
+        SDL_Surface *loadedImage = SDL_LoadBMP(file.c_str());
+        //If the loading went ok, convert to texture and return the texture
+        if (loadedImage != nullptr){
+                texture = SDL_CreateTextureFromSurface(ren, loadedImage);
+                SDL_FreeSurface(loadedImage);
+                //Make sure converting went ok too
+                if (texture == nullptr){
+                        logSDLError(std::cout, "CreateTextureFromSurface");
+                }
+        }
+        else {
+                logSDLError(std::cout, "LoadBMP");
+        }
+        return texture;
+}
+
+int main()
+{
+	//sdl init
+	if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
+		std::cout << "err" << SDL_GetError() << std::endl;
+	//window init
+        SDL_Window *win = SDL_CreateWindow("Hello World!", 100, 100, ScreenWidth, ScreenHeight, SDL_WINDOW_SHOWN);
+	//renderer init
+        SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+
+//        //load texture to ram
+//        SDL_Surface *bmp = SDL_LoadBMP("test.bmp");
+//        //load to gpu
+//        SDL_Texture *cat = SDL_CreateTextureFromSurface(ren, bmp);
+//        //remove texture from ram
+//        SDL_FreeSurface(bmp);
+//        //load texture to ram
+//        *bmp = SDL_LoadBMP("bg.bmp");
+//        //load to gpu
+//        SDL_Texture *bg = SDL_CreateTextureFromSurface(ren, bmp);
+//        //remove texture from ram
+//        SDL_FreeSurface(bmp);
+        SDL_Texture *cat = loadTexture("text.bmp", ren);
+        SDL_Texture *bg = loadTexture("bg.bmp",ren);
+        //loop
+        loop(ren,cat,bg);
+
+	//deinit
+        SDL_DestroyTexture(cat);
+        SDL_DestroyTexture(bg);
+	SDL_DestroyRenderer(ren);
+	SDL_DestroyWindow(win);
+	SDL_Quit();
+
+	return 0;
+}