export declare const frag = "\nuniform sampler2D u_Texture;\nin vec2 v_Uv;\n\nout vec4 outputColor;\n\nfloat MonochromeNTSC(vec3 t_Color) {\n  // NTSC primaries.\n  return dot(t_Color.rgb, vec3(0.299, 0.587, 0.114));\n}\n\nvec4 FXAA(PD_SAMPLER_2D(t_Texture), in vec2 t_PixelCenter, in vec2 t_InvResolution) {\n  // FXAA v2, based on implementations:\n  // http://www.geeks3d.com/20110405/fxaa-fast-approximate-anti-aliasing-demo-glsl-opengl-test-radeon-geforce/\n  // https://github.com/mitsuhiko/webgl-meincraft\n\n  float lumaMM = MonochromeNTSC(texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy).rgb);\n\n#if 1\n  vec2 t_PixelTopLeft = t_PixelCenter.xy - t_InvResolution.xy * 0.5;\n  float lumaNW = MonochromeNTSC(texture(PU_SAMPLER_2D(t_Texture), t_PixelTopLeft.xy).rgb);\n  float lumaNE = MonochromeNTSC(textureOffset(PU_SAMPLER_2D(t_Texture), t_PixelTopLeft.xy, ivec2(1, 0)).rgb);\n  float lumaSW = MonochromeNTSC(textureOffset(PU_SAMPLER_2D(t_Texture), t_PixelTopLeft.xy, ivec2(0, 1)).rgb);\n  float lumaSE = MonochromeNTSC(textureOffset(PU_SAMPLER_2D(t_Texture), t_PixelTopLeft.xy, ivec2(1, 1)).rgb);\n#else\n  // We're at the pixel center -- pixel edges are 0.5 units away.\n  // NOTE(jstpierre): mitsuhiko's port seems to get this wrong?\n  vec2 t_PixelSize = t_InvResolution.xy * 0.5;\n\n  float lumaNW = MonochromeNTSC(texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + t_PixelSize * vec2(-1.0, -1.0)).rgb);\n  float lumaNE = MonochromeNTSC(texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + t_PixelSize * vec2( 1.0, -1.0)).rgb);\n  float lumaSW = MonochromeNTSC(texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + t_PixelSize * vec2(-1.0,  1.0)).rgb);\n  float lumaSE = MonochromeNTSC(texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + t_PixelSize * vec2( 1.0,  1.0)).rgb);\n#endif\n\n  vec2 dir;\n  dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE));\n  dir.y =  ((lumaNW + lumaSW) - (lumaNE + lumaSE));\n\n  const float FXAA_REDUCE_MIN = 1.0/128.0;\n  const float FXAA_REDUCE_MUL = 1.0/8.0;\n  const float FXAA_SPAN_MAX = 8.0;\n\n  float dirReduce = max(\n      (lumaNW + lumaNE + lumaSW + lumaSE) * (0.25 * FXAA_REDUCE_MUL),\n      FXAA_REDUCE_MIN);\n\n  float rcpDirMin = 1.0/(min(abs(dir.x), abs(dir.y)) + dirReduce);\n  dir = min(vec2( FXAA_SPAN_MAX,  FXAA_SPAN_MAX), max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX), dir * rcpDirMin)) * t_InvResolution.xy;\n\n  float lumaMin = min(lumaMM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE)));\n  float lumaMax = max(lumaMM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE)));\n\n  vec4 rgbA = (1.0/2.0) * (\n      texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + dir * (1.0/3.0 - 0.5)) +\n      texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + dir * (2.0/3.0 - 0.5)));\n  vec4 rgbB = rgbA * (1.0/2.0) + (1.0/4.0) * (\n      texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + dir * (0.0/3.0 - 0.5)) +\n      texture(PU_SAMPLER_2D(t_Texture), t_PixelCenter.xy + dir * (3.0/3.0 - 0.5)));\n  float lumaB = MonochromeNTSC(rgbB.rgb);\n\n  vec4 rgbOutput = ((lumaB < lumaMin) || (lumaB > lumaMax)) ? rgbA : rgbB;\n  return rgbOutput;\n}\n\nvoid main() {\n  vec2 t_InvResolution = 1.0 / vec2(textureSize(TEXTURE(u_Texture), 0));\n  outputColor = FXAA(PP_SAMPLER_2D(u_Texture), v_Uv.xy, t_InvResolution);\n}\n";