Atlas - testdrawchessboard.c
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[FILE BEGIN]
1/*
2   Copyright (C) 1997-2025 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 (nitin.j4\samsung.com)
13*/
14
15/* Sample program:  Draw a Chess Board  by using the SDL render API */
16
17/* This allows testing SDL_CreateSoftwareRenderer with the window surface API. Undefine it to use the accelerated renderer instead. */
18#define USE_SOFTWARE_RENDERER
19
20#include <SDL3/SDL.h>
21#include <SDL3/SDL_main.h>
22#include <SDL3/SDL_test.h>
23
24#ifdef SDL_PLATFORM_EMSCRIPTEN
25#include <emscripten/emscripten.h>
26#endif
27
28static SDL_Window *window;
29static SDL_Renderer *renderer;
30static int done;
31
32#ifdef USE_SOFTWARE_RENDERER
33static SDL_Surface *surface;
34#endif
35
36static void DrawChessBoard(void)
37{
38    int row = 0, column = 0, x = 0;
39    SDL_FRect rect;
40    SDL_Rect darea;
41
42    /* Get the Size of drawing surface */
43    SDL_GetRenderViewport(renderer, &darea);
44
45    for (; row < 8; row++) {
46        column = row % 2;
47        x = column;
48        for (; column < 4 + (row % 2); column++) {
49            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
50
51            rect.w = (float)(darea.w / 8);
52            rect.h = (float)(darea.h / 8);
53            rect.x = x * rect.w;
54            rect.y = row * rect.h;
55            x = x + 2;
56            SDL_RenderFillRect(renderer, &rect);
57
58            /* Draw a red diagonal line through the upper left rectangle */
59            if (column == 0 && row == 0) {
60                SDL_SetRenderDrawColor(renderer, 0xFF, 0, 0, 0xFF);
61                SDL_RenderLine(renderer, 0, 0, rect.w, rect.h);
62            }
63        }
64    }
65}
66
67static void loop(void)
68{
69    SDL_Event e;
70    while (SDL_PollEvent(&e)) {
71
72#ifdef USE_SOFTWARE_RENDERER
73        /* Re-create when window surface has been resized */
74        if (e.type == SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED) {
75
76            SDL_DestroyRenderer(renderer);
77
78            surface = SDL_GetWindowSurface(window);
79            renderer = SDL_CreateSoftwareRenderer(surface);
80            /* Clear the rendering surface with the specified color */
81            SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
82            SDL_RenderClear(renderer);
83        }
84#endif
85
86        if (e.type == SDL_EVENT_QUIT) {
87            done = 1;
88#ifdef SDL_PLATFORM_EMSCRIPTEN
89            emscripten_cancel_main_loop();
90#endif
91            return;
92        }
93
94        if ((e.type == SDL_EVENT_KEY_DOWN) && (e.key.key == SDLK_ESCAPE)) {
95            done = 1;
96#ifdef SDL_PLATFORM_EMSCRIPTEN
97            emscripten_cancel_main_loop();
98#endif
99            return;
100        }
101    }
102
103    /* Clear the rendering surface with the specified color */
104    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
105    SDL_RenderClear(renderer);
106
107    DrawChessBoard();
108
109    SDL_RenderPresent(renderer);
110
111#ifdef USE_SOFTWARE_RENDERER
112    /* Got everything on rendering surface,
113       now Update the drawing image on window screen */
114    SDL_UpdateWindowSurface(window);
115#endif
116}
117
118int main(int argc, char *argv[])
119{
120    SDLTest_CommonState *state;
121
122    /* Initialize test framework */
123    state = SDLTest_CommonCreateState(argv, 0);
124    if (!state) {
125        return 1;
126    }
127
128    /* Parse commandline */
129    if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
130        return 1;
131    }
132
133    /* Initialize SDL */
134    if (!SDL_Init(SDL_INIT_VIDEO)) {
135        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init fail : %s", SDL_GetError());
136        return 1;
137    }
138
139    /* Create window and renderer for given surface */
140    window = SDL_CreateWindow("Chess Board", 640, 480, SDL_WINDOW_RESIZABLE);
141    if (!window) {
142        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s", SDL_GetError());
143        return 1;
144    }
145#ifdef USE_SOFTWARE_RENDERER
146    surface = SDL_GetWindowSurface(window);
147    renderer = SDL_CreateSoftwareRenderer(surface);
148#else
149    renderer = SDL_CreateRenderer(window, NULL);
150#endif
151    if (!renderer) {
152        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Render creation for surface fail : %s", SDL_GetError());
153        return 1;
154    }
155
156    /* Draw the Image on rendering surface */
157    done = 0;
158#ifdef SDL_PLATFORM_EMSCRIPTEN
159    emscripten_set_main_loop(loop, 0, 1);
160#else
161    while (!done) {
162        loop();
163    }
164#endif
165
166    SDL_DestroyRenderer(renderer);
167    SDL_DestroyWindow(window);
168
169    SDL_Quit();
170    SDLTest_CommonDestroyState(state);
171    return 0;
172}
173
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