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147 lines
3.7 KiB
147 lines
3.7 KiB
/* |
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> |
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This software is provided 'as-is', without any express or implied |
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warranty. In no event will the authors be held liable for any damages |
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arising from the use of this software. |
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Permission is granted to anyone to use this software for any purpose, |
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including commercial applications, and to alter it and redistribute it |
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freely. |
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This file is created by : Nitin Jain (nitin.j4@samsung.com) |
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*/ |
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/* Sample program: Draw a Chess Board by using SDL_CreateSoftwareRenderer API */ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#ifdef __EMSCRIPTEN__ |
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#include <emscripten/emscripten.h> |
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#endif |
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#include "SDL.h" |
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SDL_Window *window; |
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SDL_Renderer *renderer; |
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SDL_Surface *surface; |
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int done; |
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void |
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DrawChessBoard(SDL_Renderer * renderer) |
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{ |
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int row = 0,column = 0,x = 0; |
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SDL_Rect rect, darea; |
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/* Get the Size of drawing surface */ |
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SDL_RenderGetViewport(renderer, &darea); |
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for( ; row < 8; row++) |
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{ |
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column = row%2; |
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x = column; |
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for( ; column < 4+(row%2); column++) |
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{ |
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF); |
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rect.w = darea.w/8; |
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rect.h = darea.h/8; |
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rect.x = x * rect.w; |
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rect.y = row * rect.h; |
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x = x + 2; |
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SDL_RenderFillRect(renderer, &rect); |
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} |
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} |
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} |
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void |
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loop() |
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{ |
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SDL_Event e; |
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while (SDL_PollEvent(&e)) { |
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/* Re-create when window has been resized */ |
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if ((e.type == SDL_WINDOWEVENT) && (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)) { |
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SDL_DestroyRenderer(renderer); |
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surface = SDL_GetWindowSurface(window); |
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renderer = SDL_CreateSoftwareRenderer(surface); |
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/* Clear the rendering surface with the specified color */ |
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SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF); |
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SDL_RenderClear(renderer); |
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} |
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if (e.type == SDL_QUIT) { |
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done = 1; |
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#ifdef __EMSCRIPTEN__ |
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emscripten_cancel_main_loop(); |
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#endif |
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return; |
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} |
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if ((e.type == SDL_KEYDOWN) && (e.key.keysym.sym == SDLK_ESCAPE)) { |
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done = 1; |
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#ifdef __EMSCRIPTEN__ |
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emscripten_cancel_main_loop(); |
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#endif |
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return; |
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} |
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} |
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DrawChessBoard(renderer); |
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/* Got everything on rendering surface, |
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now Update the drawing image on window screen */ |
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SDL_UpdateWindowSurface(window); |
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} |
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int |
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main(int argc, char *argv[]) |
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{ |
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/* Enable standard application logging */ |
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO); |
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/* Initialize SDL */ |
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if(SDL_Init(SDL_INIT_VIDEO) != 0) |
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{ |
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init fail : %s\n", SDL_GetError()); |
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return 1; |
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} |
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/* Create window and renderer for given surface */ |
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window = SDL_CreateWindow("Chess Board", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_RESIZABLE); |
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if(!window) |
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{ |
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s\n",SDL_GetError()); |
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return 1; |
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} |
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surface = SDL_GetWindowSurface(window); |
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renderer = SDL_CreateSoftwareRenderer(surface); |
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if(!renderer) |
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{ |
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Render creation for surface fail : %s\n",SDL_GetError()); |
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return 1; |
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} |
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/* Clear the rendering surface with the specified color */ |
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SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF); |
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SDL_RenderClear(renderer); |
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/* Draw the Image on rendering surface */ |
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done = 0; |
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#ifdef __EMSCRIPTEN__ |
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emscripten_set_main_loop(loop, 0, 1); |
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#else |
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while (!done) { |
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loop(); |
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} |
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#endif |
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SDL_Quit(); |
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return 0; |
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} |
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