SDL 2.0
testdrawchessboard.c
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1/*
2 Copyright (C) 1997-2019 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
29int done;
30
31void
33{
34 int row = 0,column = 0,x = 0;
35 SDL_Rect rect, darea;
36
37 /* Get the Size of drawing surface */
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;
54 }
55 }
56}
57
58void
60{
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
68
71 /* Clear the rendering surface with the specified color */
72 SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
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
94
95 /* Got everything on rendering surface,
96 now Update the drawing image on window screen */
98}
99
100int
101main(int argc, char *argv[])
102{
103 /* Enable standard application logging */
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 */
116 if(!window)
117 {
118 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s\n",SDL_GetError());
119 return 1;
120 }
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);
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
#define SDL_INIT_VIDEO
Definition: SDL.h:79
#define SDL_CreateSoftwareRenderer
#define SDL_RenderGetViewport
#define SDL_GetError
#define SDL_PollEvent
#define SDL_RenderFillRect
#define SDL_DestroyRenderer
#define SDL_SetRenderDrawColor
#define SDL_CreateWindow
#define SDL_LogSetPriority
#define SDL_UpdateWindowSurface
#define SDL_RenderClear
#define SDL_LogError
#define SDL_Quit
#define SDL_Init
#define SDL_GetWindowSurface
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 SDL_AssertionHandler void SDL_SpinLock SDL_atomic_t int int return SDL_atomic_t return void void void return void return int return SDL_AudioSpec SDL_AudioSpec return int int return return int SDL_RWops int SDL_AudioSpec Uint8 Uint32 * e
@ SDL_QUIT
Definition: SDL_events.h:60
@ SDL_WINDOWEVENT
Definition: SDL_events.h:92
@ SDL_KEYDOWN
Definition: SDL_events.h:96
@ SDLK_ESCAPE
Definition: SDL_keycode.h:55
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
@ SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
GLenum GLenum void void * column
GLenum GLenum void * row
#define SDL_WINDOWPOS_UNDEFINED
Definition: SDL_video.h:130
@ SDL_WINDOW_RESIZABLE
Definition: SDL_video.h:105
@ SDL_WINDOWEVENT_SIZE_CHANGED
Definition: SDL_video.h:156
EGLSurface surface
Definition: eglext.h:248
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
A rectangle, with the origin at the upper left (integer).
Definition: SDL_rect.h:78
int h
Definition: SDL_rect.h:80
int w
Definition: SDL_rect.h:80
int y
Definition: SDL_rect.h:79
int x
Definition: SDL_rect.h:79
A collection of pixels used in software blitting.
Definition: SDL_surface.h:71
The type used to identify a window.
Definition: SDL_sysvideo.h:74
int main(int argc, char *argv[])
SDL_Surface * surface
int done
void DrawChessBoard(SDL_Renderer *renderer)
SDL_Renderer * renderer
SDL_Window * window
void loop()
SDL_Rect rect
Definition: testrelative.c:27
General event structure.
Definition: SDL_events.h:558