CC/sdl_emscripten/main.c

#include <stdio.h>
#include <assert.h>

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>

#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif

const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

int main(int argc, char **argv) {
  if (SDL_Init(SDL_INIT_VIDEO) != 0) {
    printf("error initializing SDL: %s\n", SDL_GetError());

    return 1;
  }

  SDL_Window *window = NULL;
  window =
      SDL_CreateWindow("Hello, SDL 2!", SDL_WINDOWPOS_CENTERED,
                       SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH, SCREEN_HEIGHT, 0);

      if (window == NULL) {
    return 1;
  }

   SDL_Renderer* renderer = NULL;
    renderer =  SDL_CreateRenderer( window, -1, SDL_RENDERER_ACCELERATED);
    SDL_SetRenderDrawColor( renderer, 255, 0, 0, 255 );
    SDL_RenderClear( renderer );



  SDL_Rect dest;
  dest.w= 50;
  dest.h= 50;
  dest.x = 10;
  dest.y = 10;

  SDL_SetRenderDrawColor( renderer, 0, 0, 255, 255 );
  SDL_RenderFillRect( renderer, &dest );

  // SDL_Surface *image = IMG_Load("girl_faces.png");
  // if (!image) {
  //   printf("IMG_Load: %s\n", IMG_GetError());
  //   return 0;
  // }

  // SDL_Texture *tex = SDL_CreateTextureFromSurface(rend, image);
  // SDL_FreeSurface(image);
  // SDL_QueryTexture(tex, NULL, NULL, &dest.w, &dest.h);

  // SDL_RenderClear(rend);
  // SDL_RenderCopy(rend, tex, NULL, &dest);
  SDL_RenderPresent(renderer);

  SDL_Delay(2000);
  SDL_DestroyWindow(window);
  SDL_Quit();

  return 0;

  //   printf("hello, world!\n");

  // puts("0");

  //   if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
  //     printf("error initializing SDL: %s\n", SDL_GetError());

  //     return 1;
  //   }

  //   SDL_Surface *screen_surface = NULL;

  //   SDL_Window *window = NULL;

  // puts("1");

  //   window =
  //       SDL_CreateWindow("Hello, SDL 2!", SDL_WINDOWPOS_CENTERED,
  //                        SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH, SCREEN_HEIGHT,
  //                        0);

  //   if (window == NULL) {
  //     return 1;
  //   }

  //   Uint32 render_flags = SDL_RENDERER_ACCELERATED;

  //     // creates a renderer to render our images
  //     SDL_Renderer* rend = SDL_CreateRenderer(window, -1, render_flags);

  //   screen_surface = SDL_GetWindowSurface(window);

  //   // creates a surface to load an image into the main memory
  //   SDL_Surface *surface;
  //   // please provide a path for your image
  //   surface = IMG_Load("girl_faces.png");
  //   // loads image to our graphics hardware memory.
  //   SDL_Texture *tex = SDL_CreateTextureFromSurface(rend, surface);
  //   // clears main-memory
  //   SDL_FreeSurface(surface);
  //   // let us control our image position
  //   // so that we can move it with our keyboard.
  //   SDL_Rect dest;
  //   // connects our texture with dest to control position
  //   SDL_QueryTexture(tex, NULL, NULL, &dest.w, &dest.h);
  //   // adjust height and width of our image box.
  //   dest.w /= 6;
  //   dest.h /= 6;
  //   // sets initial x-position of object
  //   dest.x = (1000 - dest.w) / 2;
  //   // sets initial y-position of object
  //   dest.y = (1000 - dest.h) / 2;

  // puts("13");

  // // controls animation loop
  //   int close = 0;

  //   // speed of box
  //   int speed = 300;

  //   // animation loop
  //   while (!close) {
  //       SDL_Event event;

  //       // Events management
  //       while (SDL_PollEvent(&event)) {
  //           switch (event.type) {

  //           case SDL_QUIT:
  //               // handling of close button
  //               close = 1;
  //               break;

  //           case SDL_KEYDOWN:
  //               // keyboard API for key pressed
  //               switch (event.key.keysym.scancode) {
  //               case SDL_SCANCODE_ESCAPE:
  //                   close = 1;
  //                   break;
  //               case SDL_SCANCODE_W:
  //               case SDL_SCANCODE_UP:
  //                   dest.y -= speed / 30;
  //                   break;
  //               case SDL_SCANCODE_A:
  //               case SDL_SCANCODE_LEFT:
  //                   dest.x -= speed / 30;
  //                   break;
  //               case SDL_SCANCODE_S:
  //               case SDL_SCANCODE_DOWN:
  //                   dest.y += speed / 30;
  //                   break;
  //               case SDL_SCANCODE_D:
  //               case SDL_SCANCODE_RIGHT:
  //                   dest.x += speed / 30;
  //                   break;
  //               default:
  //                   break;
  //               }
  //           }
  //       }

  //       // right boundary
  //       if (dest.x + dest.w > 1000)
  //           dest.x = 1000 - dest.w;

  //       // left boundary
  //       if (dest.x < 0)
  //           dest.x = 0;

  //       // bottom boundary
  //       if (dest.y + dest.h > 1000)
  //           dest.y = 1000 - dest.h;

  //       // upper boundary
  //       if (dest.y < 0)
  //           dest.y = 0;

  //       // clears the screen
  //       SDL_RenderClear(rend);
  //       SDL_RenderCopy(rend, tex, NULL, &dest);

  //      ///
  //      /// Section 4: SDL ttf and rendering text
  //      ///

  //       // triggers the double buffers
  //       // for multiple rendering
  //       SDL_RenderPresent(rend);

  //       // calculates to 60 fps
  //       SDL_Delay(1000 / 60);
  //   }

  // SDL_Delay(2000);

  // SDL_DestroyWindow(window);

  // SDL_Quit();
}