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<div class="section" id="using-ringlibsdl">
<span id="index-0"></span><h1>Using RingLibSDL<a class="headerlink" href="#using-ringlibsdl" title="Permalink to this headline">¶</a></h1>
<p>In this chapter we will learn about using RingLibSDL to create games based on the
LibSDL, SDLImage, SDLTTF and SDLMixer libraries.</p>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>RingLibSDL is not distributed with the binary releases for desktop which uses RingAllegro</p>
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<p class="admonition-title">Note</p>
<p>To use RingLibSDL, Check ring/android/ringlibsdl folder.</p>
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<div class="section" id="create-window">
<span id="index-1"></span><h2>Create Window<a class="headerlink" href="#create-window" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">SDL_Delay</span><span class="p">(</span><span class="mi">2000</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="display-image">
<span id="index-2"></span><h2>Display Image<a class="headerlink" href="#display-image" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">ren</span> <span class="o">=</span> <span class="n">SDL_CreateRenderer</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="n">SDL_RENDERER_ACCELERATED</span> <span class="o">|</span> <span class="n">SDL_RENDERER_PRESENTVSYNC</span> <span class="p">)</span>
<span class="n">bmp</span> <span class="o">=</span> <span class="n">SDL_LoadBMP</span><span class="p">(</span><span class="s">"hello.bmp"</span><span class="p">)</span>
<span class="n">tex</span> <span class="o">=</span> <span class="n">SDL_CreateTextureFromSurface</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_RenderClear</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_RenderCopy2</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">tex</span><span class="p">)</span>
<span class="n">SDL_RenderPresent</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_Delay</span><span class="p">(</span><span class="mi">2000</span><span class="p">)</span>
<span class="n">SDL_DestroyTexture</span><span class="p">(</span><span class="n">tex</span><span class="p">)</span>
<span class="n">SDL_DestroyRenderer</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="switch-between-two-images">
<span id="index-3"></span><h2>Switch between two images<a class="headerlink" href="#switch-between-two-images" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">ren</span> <span class="o">=</span> <span class="n">SDL_CreateRenderer</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="n">SDL_RENDERER_ACCELERATED</span> <span class="o">|</span> <span class="n">SDL_RENDERER_PRESENTVSYNC</span> <span class="p">)</span>
<span class="n">bmp</span> <span class="o">=</span> <span class="n">SDL_LoadBMP</span><span class="p">(</span><span class="s">"hello.bmp"</span><span class="p">)</span>
<span class="n">tex</span> <span class="o">=</span> <span class="n">SDL_CreateTextureFromSurface</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">bmp</span> <span class="o">=</span> <span class="n">SDL_LoadBMP</span><span class="p">(</span><span class="s">"hello2.bmp"</span><span class="p">)</span>
<span class="n">tex2</span> <span class="o">=</span> <span class="n">SDL_CreateTextureFromSurface</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">bmp</span><span class="p">)</span>
<span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">10</span> <span class="n">showtex</span><span class="p">(</span><span class="n">tex</span><span class="p">)</span> <span class="n">showtex</span><span class="p">(</span><span class="n">tex2</span><span class="p">)</span> <span class="k">next</span>
<span class="n">SDL_DestroyTexture</span><span class="p">(</span><span class="n">tex</span><span class="p">)</span>
<span class="n">SDL_DestroyTexture</span><span class="p">(</span><span class="n">tex2</span><span class="p">)</span>
<span class="n">SDL_DestroyRenderer</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
<span class="k">func</span> <span class="n">showtex</span> <span class="n">oTex</span>
<span class="n">SDL_RenderClear</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_RenderCopy2</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">oTex</span><span class="p">)</span>
<span class="n">SDL_RenderPresent</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_Delay</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="draw-rectangle">
<span id="index-4"></span><h2>Draw Rectangle<a class="headerlink" href="#draw-rectangle" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">ren</span> <span class="o">=</span> <span class="n">SDL_CreateRenderer</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="n">SDL_RENDERER_ACCELERATED</span> <span class="o">|</span> <span class="n">SDL_RENDERER_PRESENTVSYNC</span> <span class="p">)</span>
<span class="n">SDL_RenderClear</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">rect</span> <span class="o">=</span> <span class="n">sdl_new_sdl_rect</span><span class="p">()</span>
<span class="n">sdl_set_sdl_rect_x</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">10</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_y</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">10</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_w</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">100</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_h</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">100</span><span class="p">)</span>
<span class="n">SDL_SetRenderDrawColor</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="mi">255</span><span class="p">,</span><span class="mi">255</span><span class="p">,</span><span class="mi">255</span><span class="p">,</span><span class="mi">255</span><span class="p">)</span>
<span class="n">SDL_RenderDrawRect</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">rect</span><span class="p">)</span>
<span class="n">sdl_destroy_sdl_rect</span><span class="p">(</span><span class="n">rect</span><span class="p">)</span>
<span class="n">SDL_RenderPresent</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_Delay</span><span class="p">(</span><span class="mi">2000</span><span class="p">)</span>
<span class="n">SDL_DestroyRenderer</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="display-png-images">
<span id="index-5"></span><h2>Display PNG Images<a class="headerlink" href="#display-png-images" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">ren</span> <span class="o">=</span> <span class="n">SDL_CreateRenderer</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="n">SDL_RENDERER_ACCELERATED</span> <span class="o">|</span> <span class="n">SDL_RENDERER_PRESENTVSYNC</span> <span class="p">)</span>
<span class="n">bmp</span> <span class="o">=</span> <span class="n">IMG_Load</span><span class="p">(</span><span class="s">"hello3.png"</span><span class="p">)</span>
<span class="n">tex</span> <span class="o">=</span> <span class="n">SDL_CreateTextureFromSurface</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_RenderClear</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_RenderCopy2</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">tex</span><span class="p">)</span>
<span class="n">SDL_RenderPresent</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_Delay</span><span class="p">(</span><span class="mi">2000</span><span class="p">)</span>
<span class="n">SDL_DestroyTexture</span><span class="p">(</span><span class="n">tex</span><span class="p">)</span>
<span class="n">SDL_DestroyRenderer</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="use-ttf-fonts">
<span id="index-6"></span><h2>Use TTF Fonts<a class="headerlink" href="#use-ttf-fonts" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">ren</span> <span class="o">=</span> <span class="n">SDL_CreateRenderer</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="n">SDL_RENDERER_ACCELERATED</span> <span class="o">|</span> <span class="n">SDL_RENDERER_PRESENTVSYNC</span> <span class="p">)</span>
<span class="n">SDL_RenderClear</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">TTF_Init</span><span class="p">()</span>
<span class="n">font</span> <span class="o">=</span> <span class="n">TTF_OpenFont</span><span class="p">(</span><span class="s">"pirulen.ttf"</span><span class="p">,</span> <span class="mi">16</span><span class="p">)</span>
<span class="n">color</span> <span class="o">=</span> <span class="n">sdl_new_sdl_color</span><span class="p">()</span>
<span class="n">sdl_set_sdl_color_r</span><span class="p">(</span><span class="n">color</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">sdl_set_sdl_color_g</span><span class="p">(</span><span class="n">color</span><span class="p">,</span><span class="mi">255</span><span class="p">)</span>
<span class="n">sdl_set_sdl_color_b</span><span class="p">(</span><span class="n">color</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">TTF_RenderText_Solid</span><span class="p">(</span><span class="n">font</span><span class="p">,</span><span class="s">"Welcome to the Ring language"</span><span class="p">,</span><span class="n">color</span><span class="p">)</span>
<span class="n">surface</span> <span class="o">=</span> <span class="n">SDL_GetWindowSurface</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_BlitSurface</span><span class="p">(</span><span class="n">text</span><span class="p">,</span> <span class="n">nullpointer</span><span class="p">(),</span> <span class="n">surface</span><span class="p">,</span> <span class="n">nullpointer</span><span class="p">())</span>
<span class="n">SDL_UpdateWindowSurface</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Delay</span><span class="p">(</span><span class="mi">2000</span><span class="p">)</span>
<span class="n">SDL_Destroy_SDL_Color</span><span class="p">(</span><span class="n">color</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">text</span><span class="p">)</span>
<span class="n">TTF_CloseFont</span><span class="p">(</span><span class="n">font</span><span class="p">)</span>
<span class="n">SDL_DestroyRenderer</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="display-transparent-images">
<span id="index-7"></span><h2>Display Transparent Images<a class="headerlink" href="#display-transparent-images" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">flags</span> <span class="o">=</span> <span class="n">IMG_INIT_JPG</span> <span class="o">|</span> <span class="n">IMG_INIT_PNG</span>
<span class="n">IMG_Init</span><span class="p">(</span><span class="n">flags</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">800</span><span class="p">,</span> <span class="mi">600</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">ren</span> <span class="o">=</span> <span class="n">SDL_CreateRenderer</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="n">SDL_RENDERER_ACCELERATED</span> <span class="o">|</span> <span class="n">SDL_RENDERER_PRESENTVSYNC</span> <span class="p">)</span>
<span class="n">bmp</span> <span class="o">=</span> <span class="n">IMG_Load</span><span class="p">(</span><span class="s">"stars.jpg"</span><span class="p">)</span>
<span class="n">tex</span> <span class="o">=</span> <span class="n">SDL_CreateTextureFromSurface</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_RenderClear</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_RenderCopy</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">tex</span><span class="p">,</span><span class="n">nullpointer</span><span class="p">(),</span><span class="n">nullpointer</span><span class="p">())</span>
<span class="n">SDL_DestroyTexture</span><span class="p">(</span><span class="n">tex</span><span class="p">)</span>
<span class="n">bmp</span> <span class="o">=</span> <span class="n">IMG_Load</span><span class="p">(</span><span class="s">"player.png"</span><span class="p">)</span>
<span class="c"># Image - Set Transparent color (white)</span>
<span class="n">myformat</span> <span class="o">=</span> <span class="n">sdl_get_sdl_surface_format</span><span class="p">(</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">white</span> <span class="o">=</span> <span class="n">SDL_MapRGB</span><span class="p">(</span><span class="n">myformat</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">)</span>
<span class="n">SDL_SetColorKey</span><span class="p">(</span><span class="n">bmp</span><span class="p">,</span> <span class="n">SDL_True</span><span class="p">,</span> <span class="n">white</span><span class="p">)</span>
<span class="n">tex</span> <span class="o">=</span> <span class="n">SDL_CreateTextureFromSurface</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">bmp</span><span class="p">)</span>
<span class="n">rect</span> <span class="o">=</span> <span class="n">sdl_new_sdl_rect</span><span class="p">()</span>
<span class="n">sdl_set_sdl_rect_x</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_y</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_w</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">100</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_h</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">100</span><span class="p">)</span>
<span class="n">SDL_RenderCopy</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">tex</span><span class="p">,</span><span class="n">nullpointer</span><span class="p">(),</span><span class="n">rect</span><span class="p">)</span>
<span class="n">SDL_SetTextureBlendMode</span><span class="p">(</span><span class="n">tex</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span>
<span class="n">SDL_SetTextureAlphaMod</span><span class="p">(</span><span class="n">tex</span><span class="p">,</span><span class="mi">255</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_x</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">200</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_y</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">200</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_w</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">100</span><span class="p">)</span>
<span class="n">sdl_set_sdl_rect_h</span><span class="p">(</span><span class="n">rect</span><span class="p">,</span><span class="mi">100</span><span class="p">)</span>
<span class="n">SDL_RenderCopy</span><span class="p">(</span><span class="n">ren</span><span class="p">,</span><span class="n">tex</span><span class="p">,</span><span class="n">nullpointer</span><span class="p">(),</span><span class="n">rect</span><span class="p">)</span>
<span class="n">SDL_DestroyTexture</span><span class="p">(</span><span class="n">tex</span><span class="p">)</span>
<span class="n">SDL_Destroy_SDL_Rect</span><span class="p">(</span><span class="n">rect</span><span class="p">)</span>
<span class="n">SDL_RenderPresent</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_Delay</span><span class="p">(</span><span class="mi">2000</span><span class="p">)</span>
<span class="n">SDL_DestroyRenderer</span><span class="p">(</span><span class="n">ren</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="close-window-event">
<span id="index-8"></span><h2>Close Window Event<a class="headerlink" href="#close-window-event" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">myevent</span> <span class="o">=</span> <span class="n">sdl_new_sdl_event</span><span class="p">()</span>
<span class="k">while</span> <span class="kp">true</span>
<span class="n">thevent</span> <span class="o">=</span> <span class="n">sdl_pollevent</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">switch</span> <span class="n">sdl_get_sdl_event_type</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">on</span> <span class="n">sdl_get_sdl_quit</span><span class="p">()</span>
<span class="k">exit</span>
<span class="k">on</span> <span class="n">sdl_get_sdl_keydown</span><span class="p">()</span>
<span class="n">Key</span> <span class="o">=</span> <span class="n">SDL_GET_SDL_Event_key_keysym_sym</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">if</span> <span class="n">key</span> <span class="o">=</span> <span class="mi">27</span> <span class="k">exit</span> <span class="k">ok</span>
<span class="k">off</span>
<span class="k">end</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
</div>
<div class="section" id="mouse-events">
<span id="index-9"></span><h2>Mouse Events<a class="headerlink" href="#mouse-events" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Mouse Events "</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">TTF_Init</span><span class="p">()</span>
<span class="n">font</span> <span class="o">=</span> <span class="n">TTF_OpenFont</span><span class="p">(</span><span class="s">"pirulen.ttf"</span><span class="p">,</span> <span class="mi">16</span><span class="p">)</span>
<span class="n">color</span> <span class="o">=</span> <span class="n">sdl_new_sdl_color</span><span class="p">()</span>
<span class="n">sdl_set_sdl_color_r</span><span class="p">(</span><span class="n">color</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">sdl_set_sdl_color_g</span><span class="p">(</span><span class="n">color</span><span class="p">,</span><span class="mi">255</span><span class="p">)</span>
<span class="n">sdl_set_sdl_color_b</span><span class="p">(</span><span class="n">color</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">surface</span> <span class="o">=</span> <span class="n">SDL_GetWindowSurface</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">myevent</span> <span class="o">=</span> <span class="n">sdl_new_sdl_event</span><span class="p">()</span>
<span class="k">while</span> <span class="kp">true</span>
<span class="n">cMsg</span> <span class="o">=</span> <span class="s">""</span>
<span class="n">sdl_pollevent</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">switch</span> <span class="n">sdl_get_sdl_event_type</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">on</span> <span class="n">SDL_QUIT</span>
<span class="k">exit</span>
<span class="k">on</span> <span class="n">SDL_KEYDOWN</span>
<span class="n">Key</span> <span class="o">=</span> <span class="n">SDL_GET_SDL_Event_key_keysym_sym</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">if</span> <span class="n">key</span> <span class="o">=</span> <span class="mi">27</span> <span class="k">exit</span> <span class="k">ok</span>
<span class="k">on</span> <span class="n">SDL_MOUSEBUTTONDOWN</span>
<span class="k">if</span> <span class="n">sdl_get_Sdl_Event_button_button</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span> <span class="o">=</span> <span class="n">SDL_BUTTON_LEFT</span>
<span class="n">SDL_SETWINDOWTITLE</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="s">" Button_Left_Down "</span> <span class="p">)</span>
<span class="k">but</span> <span class="n">sdl_get_Sdl_Event_button_button</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span> <span class="o">=</span> <span class="n">SDL_BUTTON_MIDDLE</span>
<span class="n">SDL_SETWINDOWTITLE</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="s">" Button_Middle_Down "</span> <span class="p">)</span>
<span class="k">but</span> <span class="n">sdl_get_Sdl_Event_button_button</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span> <span class="o">=</span> <span class="n">SDL_BUTTON_RIGHT</span>
<span class="n">SDL_SETWINDOWTITLE</span><span class="p">(</span><span class="n">win</span><span class="p">,</span> <span class="s">" Button_Right_Down "</span> <span class="p">)</span>
<span class="k">ok</span>
<span class="k">on</span> <span class="n">SDL_MOUSEMOTION</span>
<span class="n">sdl_fillrect</span><span class="p">(</span><span class="n">surface</span><span class="p">,</span><span class="n">nullpointer</span><span class="p">(),</span><span class="mi">0</span><span class="p">)</span>
<span class="k">if</span> <span class="n">sdl_get_sdl_event_motion_xrel</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span> <span class="o"><</span> <span class="mi">0</span>
<span class="n">cMsg</span> <span class="o">+=</span> <span class="s">" Left "</span>
<span class="k">else</span>
<span class="n">cMsg</span> <span class="o">+=</span> <span class="s">" Right "</span>
<span class="k">ok</span>
<span class="k">if</span> <span class="n">sdl_get_sdl_event_motion_yrel</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span> <span class="o"><</span> <span class="mi">0</span>
<span class="n">cMsg</span> <span class="o">+=</span> <span class="s">" Up "</span>
<span class="k">else</span>
<span class="n">cMsg</span> <span class="o">+=</span> <span class="s">" Down "</span>
<span class="k">ok</span>
<span class="n">cMsg</span> <span class="o">+=</span> <span class="s">" x = "</span> <span class="o">+</span> <span class="n">sdl_get_sdl_event_motion_x</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="n">cMsg</span> <span class="o">+=</span> <span class="s">" y = "</span> <span class="o">+</span> <span class="n">sdl_get_sdl_event_motion_y</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="n">showmsg</span><span class="p">(</span><span class="n">cMsg</span><span class="p">)</span>
<span class="k">off</span>
<span class="k">end</span>
<span class="n">SDL_Destroy_SDL_Color</span><span class="p">(</span><span class="n">Color</span><span class="p">)</span>
<span class="n">TTF_CloseFont</span><span class="p">(</span><span class="n">font</span><span class="p">)</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
<span class="k">func</span> <span class="n">showmsg</span> <span class="n">mymsg</span>
<span class="n">text</span> <span class="o">=</span> <span class="n">TTF_RenderText_Solid</span><span class="p">(</span><span class="n">font</span><span class="p">,</span><span class="n">mymsg</span><span class="p">,</span><span class="n">color</span><span class="p">)</span>
<span class="n">SDL_BlitSurface</span><span class="p">(</span><span class="n">text</span><span class="p">,</span> <span class="n">nullpointer</span><span class="p">(),</span> <span class="n">surface</span><span class="p">,</span> <span class="n">nullpointer</span><span class="p">())</span>
<span class="n">SDL_UpdateWindowSurface</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_FreeSurface</span><span class="p">(</span><span class="n">text</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="play-sound">
<span id="index-10"></span><h2>Play Sound<a class="headerlink" href="#play-sound" title="Permalink to this headline">¶</a></h2>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">Load</span> <span class="s">"libsdl.ring"</span>
<span class="n">SDL_Init</span><span class="p">(</span><span class="n">SDL_INIT_EVERYTHING</span><span class="p">)</span>
<span class="n">win</span> <span class="o">=</span> <span class="n">SDL_CreateWindow</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">640</span><span class="p">,</span> <span class="mi">480</span><span class="p">,</span> <span class="n">SDL_WINDOW_SHOWN</span><span class="p">)</span>
<span class="n">Mix_OpenAudio</span><span class="p">(</span> <span class="mi">44100</span><span class="p">,</span> <span class="n">MIX_DEFAULT_FORMAT</span> <span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">10000</span><span class="p">)</span>
<span class="n">Mix_AllocateChannels</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="n">sound</span> <span class="o">=</span> <span class="n">Mix_LoadWav</span><span class="p">(</span> <span class="s">"sound.wav"</span> <span class="p">)</span>
<span class="n">Mix_VolumeChunk</span><span class="p">(</span><span class="n">sound</span><span class="p">,</span><span class="mi">1</span><span class="p">)</span>
<span class="n">Mix_PlayChannel</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="n">sound</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">myevent</span> <span class="o">=</span> <span class="n">sdl_new_sdl_event</span><span class="p">()</span>
<span class="k">while</span> <span class="kp">true</span>
<span class="n">thevent</span> <span class="o">=</span> <span class="n">sdl_pollevent</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">switch</span> <span class="n">sdl_get_sdl_event_type</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">on</span> <span class="n">sdl_get_sdl_quit</span><span class="p">()</span>
<span class="k">exit</span>
<span class="k">on</span> <span class="n">sdl_get_sdl_keydown</span><span class="p">()</span>
<span class="n">Key</span> <span class="o">=</span> <span class="n">SDL_GET_SDL_Event_key_keysym_sym</span><span class="p">(</span><span class="n">myevent</span><span class="p">)</span>
<span class="k">if</span> <span class="n">key</span> <span class="o">=</span> <span class="mi">27</span> <span class="k">exit</span> <span class="k">ok</span>
<span class="k">off</span>
<span class="k">end</span>
<span class="n">Mix_FreeChunk</span><span class="p">(</span> <span class="n">sound</span> <span class="p">)</span>
<span class="n">Mix_CloseAudio</span><span class="p">()</span>
<span class="n">Mix_Quit</span><span class="p">()</span>
<span class="n">SDL_DestroyWindow</span><span class="p">(</span><span class="n">win</span><span class="p">)</span>
<span class="n">SDL_Quit</span><span class="p">()</span>
</pre></div>
</div>
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