sdl

FORK: Simple Directmedia Layer
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testdrawchessboard.c (3761B)

      1 /*
      2    Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      3 
      4    This software is provided 'as-is', without any express or implied
      5    warranty.  In no event will the authors be held liable for any damages
      6    arising from the use of this software.
      7 
      8    Permission is granted to anyone to use this software for any purpose,
      9    including commercial applications, and to alter it and redistribute it
     10    freely.
     11 
     12    This file is created by : Nitin Jain (nitin.j4@samsung.com)
     13 */
     14 
     15 /* Sample program:  Draw a Chess Board  by using SDL_CreateSoftwareRenderer API */
     16 
     17 #include <stdlib.h>
     18 #include <stdio.h>
     19 
     20 #ifdef __EMSCRIPTEN__
     21 #include <emscripten/emscripten.h>
     22 #endif
     23 
     24 #include "SDL.h"
     25 
     26 SDL_Window *window;
     27 SDL_Renderer *renderer;
     28 SDL_Surface *surface;
     29 int done;
     30 
     31 void
     32 DrawChessBoard(SDL_Renderer * renderer)
     33 {
     34     int row = 0,column = 0,x = 0;
     35     SDL_Rect rect, darea;
     36 
     37     /* Get the Size of drawing surface */
     38     SDL_RenderGetViewport(renderer, &darea);
     39 
     40     for( ; row < 8; row++)
     41     {
     42         column = row%2;
     43         x = column;
     44         for( ; column < 4+(row%2); column++)
     45         {
     46             SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
     47 
     48             rect.w = darea.w/8;
     49             rect.h = darea.h/8;
     50             rect.x = x * rect.w;
     51             rect.y = row * rect.h;
     52             x = x + 2;
     53             SDL_RenderFillRect(renderer, &rect);
     54         }
     55     }
     56 }
     57 
     58 void
     59 loop()
     60 {
     61     SDL_Event e;
     62     while (SDL_PollEvent(&e)) {
     63        
     64        /* Re-create when window has been resized */
     65        if ((e.type == SDL_WINDOWEVENT) && (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)) {
     66 
     67           SDL_DestroyRenderer(renderer);
     68 
     69           surface = SDL_GetWindowSurface(window);
     70           renderer = SDL_CreateSoftwareRenderer(surface);
     71           /* Clear the rendering surface with the specified color */
     72           SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
     73           SDL_RenderClear(renderer);
     74        }
     75 
     76        if (e.type == SDL_QUIT) {
     77             done = 1;
     78 #ifdef __EMSCRIPTEN__
     79             emscripten_cancel_main_loop();
     80 #endif
     81             return;
     82         }
     83 
     84         if ((e.type == SDL_KEYDOWN) && (e.key.keysym.sym == SDLK_ESCAPE)) {
     85             done = 1;
     86 #ifdef __EMSCRIPTEN__
     87             emscripten_cancel_main_loop();
     88 #endif
     89             return;
     90         }
     91     }
     92 
     93     DrawChessBoard(renderer);
     94 
     95     /* Got everything on rendering surface,
     96        now Update the drawing image on window screen */
     97     SDL_UpdateWindowSurface(window);
     98 }
     99 
    100 int
    101 main(int argc, char *argv[])
    102 {
    103     /* Enable standard application logging */
    104     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    105 
    106     /* Initialize SDL */
    107     if(SDL_Init(SDL_INIT_VIDEO) != 0)
    108     {
    109         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init fail : %s\n", SDL_GetError());
    110         return 1;
    111     }
    112 
    113 
    114     /* Create window and renderer for given surface */
    115     window = SDL_CreateWindow("Chess Board", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_RESIZABLE);
    116     if(!window)
    117     {
    118         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s\n",SDL_GetError());
    119         return 1;
    120     }
    121     surface = SDL_GetWindowSurface(window);
    122     renderer = SDL_CreateSoftwareRenderer(surface);
    123     if(!renderer)
    124     {
    125         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Render creation for surface fail : %s\n",SDL_GetError());
    126         return 1;
    127     }
    128 
    129     /* Clear the rendering surface with the specified color */
    130     SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
    131     SDL_RenderClear(renderer);
    132 
    133 
    134     /* Draw the Image on rendering surface */
    135     done = 0;
    136 #ifdef __EMSCRIPTEN__
    137     emscripten_set_main_loop(loop, 0, 1);
    138 #else
    139     while (!done) {
    140         loop();
    141     }
    142 #endif
    143 
    144     SDL_Quit();
    145     return 0;
    146 }
    147