Atlas - testdrawchessboard.c
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[FILE BEGIN]
1/*
2   Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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 ([email protected])
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
26SDL_Window *window;
27SDL_Renderer *renderer;
28SDL_Surface *surface;
29int done;
30
31void
32DrawChessBoard(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
58void
59loop()
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
100int
101main(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
148
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