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
DrawChessBoard(SDL_Renderer * renderer)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
loop()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
main(int argc,char * argv[])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
148