implemented unicode support and generation of font atlas texture

shaders/font.frag

@@ -5,7 +5,17 @@ out vec4 FragColor;
 uniform sampler2D text;
 uniform vec4 textColor;
 
+const float smoothness = 0.05;
+const float outlineDistance = 0.50;
+const vec4 outlineColor = vec4(0.0, 0.0, 0.0, 1.0);
+
 void main() {
+  //float distance = texture(text, v_TexCoords).r;
+  //float outlineFactor = smoothstep(0.5 - smoothness, 0.5 + smoothness, distance);
+  //vec4 color = mix(outlineColor, textColor, outlineFactor);
+  //float alpha = smoothstep(outlineDistance - smoothness, outlineDistance + smoothness, distance);
+
   vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, v_TexCoords).r);
   FragColor = textColor * sampled;
+  //FragColor = vec4(color.rgb, textColor.a * alpha);
 }