Yoshiboy's Antialising
From Mount&Blade Modding Wiki
Description
Yoshiboy created a simplified variation of the FXAA algorithm, used to mask the jagged edges from rendered polygons without upsampling (that is, rendering a larger image and scaling it down). So it's way faster than traditional AA.
Here you've a video showing as rough preview of the FXAA results:
http://www.youtube.com/watch?v=4GGeg1QGl8Y
Further reference:
http://en.wikipedia.org/wiki/Anti-aliasing
vec3 fxaa_unsharp(sampler2D input, vec2 pos, int width, int height) { const float sharpen = 0.5; const float boundry = 0.1; const float alias_scale = 2.75; float kernel = 1.0; float xoff = kernel / float(width); float yoff = kernel / float(height); vec3 rgb_ne = texture2D(input, pos + vec2(-xoff,yoff)).rgb; vec3 rgb_n = texture2D(input, pos + vec2(0,yoff)).rgb; vec3 rgb_nw = texture2D(input, pos + vec2(xoff,yoff)).rgb; vec3 rgb_w = texture2D(input, pos + vec2(xoff,0)).rgb; vec3 rgb_o = texture2D(input, pos + vec2(0,0)).rgb; vec3 rgb_e = texture2D(input, pos + vec2(-xoff,0)).rgb; vec3 rgb_sw = texture2D(input, pos + vec2(-xoff,-yoff)).rgb; vec3 rgb_s = texture2D(input, pos + vec2(0,-yoff)).rgb; vec3 rgb_se = texture2D(input, pos + vec2(xoff,-yoff)).rgb; vec3 average = (rgb_ne + rgb_n + rgb_nw + rgb_w + rgb_e + rgb_sw + rgb_s + rgb_se) / 8; vec3 difference = rgb_o - average; rgb_o = rgb_o + (difference * sharpen); difference = rgb_o - average; float fdiff = abs(dot(vec3(1,1,1), difference)); if (fdiff > boundry) { float alias_amount = clamp(fdiff * alias_scale, 0.25, 0.75); //return mix(vec3(0,1,0), vec3(1,0,0), alias_amount); return mix(rgb_o, average, alias_amount); } else { return rgb_o; } }
Source
Source Page and main article: http://www.theorangeduck.com/page/unsharp-anti-aliasing
Preview
