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import {
Vector2
} from 'three';
const FXAAShader = {
name: 'FXAAShader',
uniforms: {
'tDiffuse': { value: null },
'resolution': { value: new Vector2( 1 / 1024, 1 / 512 ) }
},
vertexShader: /* glsl */`
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}`,
fragmentShader: /* glsl */`
// FXAA algorithm from NVIDIA, C# implementation by Jasper Flick, GLSL port by Dave Hoskins
// http://developer.download.nvidia.com/assets/gamedev/files/sdk/11/FXAA_WhitePaper.pdf
// https://catlikecoding.com/unity/tutorials/advanced-rendering/fxaa/
uniform sampler2D tDiffuse;
uniform vec2 resolution;
varying vec2 vUv;
#define EDGE_STEP_COUNT 6
#define EDGE_GUESS 8.0
#define EDGE_STEPS 1.0, 1.5, 2.0, 2.0, 2.0, 4.0
const float edgeSteps[EDGE_STEP_COUNT] = float[EDGE_STEP_COUNT]( EDGE_STEPS );
float _ContrastThreshold = 0.0312;
float _RelativeThreshold = 0.063;
float _SubpixelBlending = 1.0;
vec4 Sample( sampler2D tex2D, vec2 uv ) {
return texture( tex2D, uv );
}
float SampleLuminance( sampler2D tex2D, vec2 uv ) {
return dot( Sample( tex2D, uv ).rgb, vec3( 0.3, 0.59, 0.11 ) );
}
float SampleLuminance( sampler2D tex2D, vec2 texSize, vec2 uv, float uOffset, float vOffset ) {
uv += texSize * vec2(uOffset, vOffset);
return SampleLuminance(tex2D, uv);
}
struct LuminanceData {
float m, n, e, s, w;
float ne, nw, se, sw;
float highest, lowest, contrast;
};
LuminanceData SampleLuminanceNeighborhood( sampler2D tex2D, vec2 texSize, vec2 uv ) {
LuminanceData l;
l.m = SampleLuminance( tex2D, uv );
l.n = SampleLuminance( tex2D, texSize, uv, 0.0, 1.0 );
l.e = SampleLuminance( tex2D, texSize, uv, 1.0, 0.0 );
l.s = SampleLuminance( tex2D, texSize, uv, 0.0, -1.0 );
l.w = SampleLuminance( tex2D, texSize, uv, -1.0, 0.0 );
l.ne = SampleLuminance( tex2D, texSize, uv, 1.0, 1.0 );
l.nw = SampleLuminance( tex2D, texSize, uv, -1.0, 1.0 );
l.se = SampleLuminance( tex2D, texSize, uv, 1.0, -1.0 );
l.sw = SampleLuminance( tex2D, texSize, uv, -1.0, -1.0 );
l.highest = max( max( max( max( l.n, l.e ), l.s ), l.w ), l.m );
l.lowest = min( min( min( min( l.n, l.e ), l.s ), l.w ), l.m );
l.contrast = l.highest - l.lowest;
return l;
}
bool ShouldSkipPixel( LuminanceData l ) {
float threshold = max( _ContrastThreshold, _RelativeThreshold * l.highest );
return l.contrast < threshold;
}
float DeterminePixelBlendFactor( LuminanceData l ) {
float f = 2.0 * ( l.n + l.e + l.s + l.w );
f += l.ne + l.nw + l.se + l.sw;
f *= 1.0 / 12.0;
f = abs( f - l.m );
f = clamp( f / l.contrast, 0.0, 1.0 );
float blendFactor = smoothstep( 0.0, 1.0, f );
return blendFactor * blendFactor * _SubpixelBlending;
}
struct EdgeData {
bool isHorizontal;
float pixelStep;
float oppositeLuminance, gradient;
};
EdgeData DetermineEdge( vec2 texSize, LuminanceData l ) {
EdgeData e;
float horizontal =
abs( l.n + l.s - 2.0 * l.m ) * 2.0 +
abs( l.ne + l.se - 2.0 * l.e ) +
abs( l.nw + l.sw - 2.0 * l.w );
float vertical =
abs( l.e + l.w - 2.0 * l.m ) * 2.0 +
abs( l.ne + l.nw - 2.0 * l.n ) +
abs( l.se + l.sw - 2.0 * l.s );
e.isHorizontal = horizontal >= vertical;
float pLuminance = e.isHorizontal ? l.n : l.e;
float nLuminance = e.isHorizontal ? l.s : l.w;
float pGradient = abs( pLuminance - l.m );
float nGradient = abs( nLuminance - l.m );
e.pixelStep = e.isHorizontal ? texSize.y : texSize.x;
if (pGradient < nGradient) {
e.pixelStep = -e.pixelStep;
e.oppositeLuminance = nLuminance;
e.gradient = nGradient;
} else {
e.oppositeLuminance = pLuminance;
e.gradient = pGradient;
}
return e;
}
float DetermineEdgeBlendFactor( sampler2D tex2D, vec2 texSize, LuminanceData l, EdgeData e, vec2 uv ) {
vec2 uvEdge = uv;
vec2 edgeStep;
if (e.isHorizontal) {
uvEdge.y += e.pixelStep * 0.5;
edgeStep = vec2( texSize.x, 0.0 );
} else {
uvEdge.x += e.pixelStep * 0.5;
edgeStep = vec2( 0.0, texSize.y );
}
float edgeLuminance = ( l.m + e.oppositeLuminance ) * 0.5;
float gradientThreshold = e.gradient * 0.25;
vec2 puv = uvEdge + edgeStep * edgeSteps[0];
float pLuminanceDelta = SampleLuminance( tex2D, puv ) - edgeLuminance;
bool pAtEnd = abs( pLuminanceDelta ) >= gradientThreshold;
for ( int i = 1; i < EDGE_STEP_COUNT && !pAtEnd; i++ ) {
puv += edgeStep * edgeSteps[i];
pLuminanceDelta = SampleLuminance( tex2D, puv ) - edgeLuminance;
pAtEnd = abs( pLuminanceDelta ) >= gradientThreshold;
}
if ( !pAtEnd ) {
puv += edgeStep * EDGE_GUESS;
}
vec2 nuv = uvEdge - edgeStep * edgeSteps[0];
float nLuminanceDelta = SampleLuminance( tex2D, nuv ) - edgeLuminance;
bool nAtEnd = abs( nLuminanceDelta ) >= gradientThreshold;
for ( int i = 1; i < EDGE_STEP_COUNT && !nAtEnd; i++ ) {
nuv -= edgeStep * edgeSteps[i];
nLuminanceDelta = SampleLuminance( tex2D, nuv ) - edgeLuminance;
nAtEnd = abs( nLuminanceDelta ) >= gradientThreshold;
}
if ( !nAtEnd ) {
nuv -= edgeStep * EDGE_GUESS;
}
float pDistance, nDistance;
if ( e.isHorizontal ) {
pDistance = puv.x - uv.x;
nDistance = uv.x - nuv.x;
} else {
pDistance = puv.y - uv.y;
nDistance = uv.y - nuv.y;
}
float shortestDistance;
bool deltaSign;
if ( pDistance <= nDistance ) {
shortestDistance = pDistance;
deltaSign = pLuminanceDelta >= 0.0;
} else {
shortestDistance = nDistance;
deltaSign = nLuminanceDelta >= 0.0;
}
if ( deltaSign == ( l.m - edgeLuminance >= 0.0 ) ) {
return 0.0;
}
return 0.5 - shortestDistance / ( pDistance + nDistance );
}
vec4 ApplyFXAA( sampler2D tex2D, vec2 texSize, vec2 uv ) {
LuminanceData luminance = SampleLuminanceNeighborhood( tex2D, texSize, uv );
if ( ShouldSkipPixel( luminance ) ) {
return Sample( tex2D, uv );
}
float pixelBlend = DeterminePixelBlendFactor( luminance );
EdgeData edge = DetermineEdge( texSize, luminance );
float edgeBlend = DetermineEdgeBlendFactor( tex2D, texSize, luminance, edge, uv );
float finalBlend = max( pixelBlend, edgeBlend );
if (edge.isHorizontal) {
uv.y += edge.pixelStep * finalBlend;
} else {
uv.x += edge.pixelStep * finalBlend;
}
return Sample( tex2D, uv );
}
void main() {
gl_FragColor = ApplyFXAA( tDiffuse, resolution.xy, vUv );
}`
};
export { FXAAShader };
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