allegro中的抗锯齿5

问题描述

如何使allegro 5在绘图时使用抗锯齿？我需要斜线看起来光滑。

解决方案

为图元启用抗锯齿：

/ p>

  //创建显示之前：
 al_set_new_display_option（ALLEGRO_SAMPLE_BUFFERS，1，ALLEGRO_SUGGEST）; 
 al_set_new_display_option（ALLEGRO_SAMPLES，8，ALLEGRO_SUGGEST）; 
 
 display = al_create_display（640，480）;请注意，消除锯齿功能只适用于直接绘制到后台缓冲区的基元。 
 
 
 
在OpenGL上，您的卡片必须支持扩展。
 
 
 
要检查是否已启用（使用ALLEGRO_SUGGEST）：
  if（al_get_display_option（display，ALLEGRO_SAMPLE_BUFFERS））{
 printf（With multisampling，level％i \\\
，
 al_get_display_option（display，ALLEGRO_SAMPLES））; 
} 
 else {
 printf（Without multisampling.\\\
）; 
} 
  
 
How do I make allegro 5 use anti-aliasing when drawing? I need diagonal lines to appear smooth. Currently, they are only lines of shaded pixels, and the edges look hard.
 解决方案 
To enable anti aliasing for the primitives:
// before creating the display:
al_set_new_display_option(ALLEGRO_SAMPLE_BUFFERS, 1, ALLEGRO_SUGGEST);
al_set_new_display_option(ALLEGRO_SAMPLES, 8, ALLEGRO_SUGGEST);

display = al_create_display(640, 480);
Note that anti-aliasing will only work for primitives drawn directly to the back buffer. It will not work anywhere else.
On OpenGL, your card must support the ARB_multisample extension.
To check if it was enabled (when using ALLEGRO_SUGGEST):
if (al_get_display_option(display, ALLEGRO_SAMPLE_BUFFERS)) {
   printf("With multisampling, level %i\n",
     al_get_display_option(display, ALLEGRO_SAMPLES));
}
else {
   printf("Without multisampling.\n");
}
                        
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