_coursrach/main.cpp

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2018-12-02 00:52:35 +03:00
#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;
}