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Lesson 2 done + little synopsis change

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This commit is contained in:
vedevdem 2018-12-04 01:56:38 +03:00
parent 8a4fc241e2
commit 3f13f0f11d
5 changed files with 66 additions and 31 deletions
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testSDL/Lesson2/-.- Executable file
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testSDL/Lesson2/hello.bmp Normal file
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testSDL/Lesson2/main.cpp
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@ -2,52 +2,87 @@
#include <iostream> #include <iostream>
using namespace std; using namespace std;
const int screen_width ; const int screen_width = 640;
const int scren_height ; const int scren_height = 480;
SDL_Window* win = NULL; SDL_Window* win = NULL;
SDL_Renderer* renderer = NULL; SDL_Renderer* ren = NULL;
SDL_Texture* LoadImage(char* path) SDL_Texture* LoadImage(const char path[])
{ {
SDL_Surface* loadedImage = NULL; SDL_Surface* loadedImage = NULL;
SDL_Texture* texture = NULL; SDL_Texture* texture = NULL;
loadedImage = SDL_LoadBMP(path); loadedImage = SDL_LoadBMP(path);
if (loadedImage != 0) if (loadedImage != 0)
{ {
texture = SDL_CreateTextureFromSurface(renderer, loadedImage); texture = SDL_CreateTextureFromSurface(ren, loadedImage);
SDL_FreeSurface(loadedImage); SDL_FreeSurface(loadedImage);
} }
else else
cout << SDL_GetError << endl; cout << SDL_GetError() << endl;
return texture; return texture;
} }
void ApplySurfaces(int x, int y, SDL_Texture* tex, SDL_Renderer* ren)
{
SDL_Rect pos;
pos.x = x;
pos.y = y;
SDL_QueryTexture(tex, NULL, NULL, &pos.w, &pos.h); //Функция заполнит pos.w и pos.h для формата текстуры 1:1
SDL_RenderCopy(ren, tex, NULL, &pos); //В нужной точке рисуем текстуру с оригинальной высотой и шириной
}
int main() int main()
{ {
if (SDL_Init(SDL_INIT_EVERYTHING) != 0 ) if (SDL_Init(SDL_INIT_EVERYTHING) == -1)
{ {
cout << "SDL_Init error\n"; cout << SDL_GetError() << endl;
return 1; return 1;
} }
SDL_Window* window = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN); win = SDL_CreateWindow("Lesson 2", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, screen_width, scren_height, SDL_WINDOW_SHOWN);
if (window == nullptr) if (win == NULL)
{ {
cout << "Window create error\n"; cout << SDL_GetError() << endl;
return 1; return 2;
} }
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED || SDL_RENDERER_PRESENTVSYNC); ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (renderer == nullptr) if (ren == NULL)
{ {
cout << "Renderer error\n"; cout << SDL_GetError() << endl;
return 1; return 3;
} }
SDL_RenderClear(renderer); SDL_Texture *background = NULL, *image = nullptr;
SDL_RenderCopy(renderer, LoadImage("./hello.bmp"), NULL, NULL); image = LoadImage("./image.bmp");
SDL_RenderPresent(renderer); background = LoadImage("./background.bmp");
SDL_Delay(3000); if (image == NULL || background == NULL)
SDL_DestroyRenderer(renderer); {
SDL_DestroyTexture(LoadImage("./hello.bmp")); cout << "bad LoadImage\n";
SDL_DestroyWindow(window); return 4;
SDL_Quit; }
SDL_RenderClear(ren);
int bW, bH;
SDL_QueryTexture(background, NULL, NULL, &bW, &bH);
//cout << bW << " " << bH << endl;
ApplySurfaces( 0, 0, background, ren);
ApplySurfaces( bW, 0, background, ren);
ApplySurfaces( 0, bH, background, ren);
ApplySurfaces( bW, bH, background, ren);
int iW, iH;
SDL_QueryTexture(image, NULL, NULL, &iW, &iH);
int x = (screen_width - iW) / 2;
int y = (scren_height - iH) / 2;
ApplySurfaces(x, y, image, ren);
SDL_RenderPresent(ren);
SDL_Delay(10000);
SDL_DestroyTexture(background);
SDL_DestroyTexture(image);
SDL_DestroyRenderer(ren);
SDL_DestroyWindow(win);
SDL_Quit();
return 0; return 0;
} }