469 lines
15 KiB
JavaScript
469 lines
15 KiB
JavaScript
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/**
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* @author mpk / http://polko.me/
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*
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* WebGL port of Subpixel Morphological Antialiasing (SMAA) v2.8
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* Preset: SMAA 1x Medium (with color edge detection)
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* https://github.com/iryoku/smaa/releases/tag/v2.8
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*/
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THREE.SMAAEdgesShader = {
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defines: {
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"SMAA_THRESHOLD": "0.1"
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},
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uniforms: {
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"tDiffuse": { value: null },
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"resolution": { value: new THREE.Vector2( 1 / 1024, 1 / 512 ) }
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},
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vertexShader: [
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"uniform vec2 resolution;",
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"varying vec2 vUv;",
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"varying vec4 vOffset[ 3 ];",
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"void SMAAEdgeDetectionVS( vec2 texcoord ) {",
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" vOffset[ 0 ] = texcoord.xyxy + resolution.xyxy * vec4( -1.0, 0.0, 0.0, 1.0 );", // WebGL port note: Changed sign in W component
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" vOffset[ 1 ] = texcoord.xyxy + resolution.xyxy * vec4( 1.0, 0.0, 0.0, -1.0 );", // WebGL port note: Changed sign in W component
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" vOffset[ 2 ] = texcoord.xyxy + resolution.xyxy * vec4( -2.0, 0.0, 0.0, 2.0 );", // WebGL port note: Changed sign in W component
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"}",
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"void main() {",
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" vUv = uv;",
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" SMAAEdgeDetectionVS( vUv );",
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" gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
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"}"
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].join( "\n" ),
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fragmentShader: [
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"uniform sampler2D tDiffuse;",
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"varying vec2 vUv;",
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"varying vec4 vOffset[ 3 ];",
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"vec4 SMAAColorEdgeDetectionPS( vec2 texcoord, vec4 offset[3], sampler2D colorTex ) {",
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" vec2 threshold = vec2( SMAA_THRESHOLD, SMAA_THRESHOLD );",
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// Calculate color deltas:
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" vec4 delta;",
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" vec3 C = texture2D( colorTex, texcoord ).rgb;",
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" vec3 Cleft = texture2D( colorTex, offset[0].xy ).rgb;",
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" vec3 t = abs( C - Cleft );",
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" delta.x = max( max( t.r, t.g ), t.b );",
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" vec3 Ctop = texture2D( colorTex, offset[0].zw ).rgb;",
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" t = abs( C - Ctop );",
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" delta.y = max( max( t.r, t.g ), t.b );",
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// We do the usual threshold:
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" vec2 edges = step( threshold, delta.xy );",
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// Then discard if there is no edge:
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" if ( dot( edges, vec2( 1.0, 1.0 ) ) == 0.0 )",
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" discard;",
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// Calculate right and bottom deltas:
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" vec3 Cright = texture2D( colorTex, offset[1].xy ).rgb;",
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" t = abs( C - Cright );",
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" delta.z = max( max( t.r, t.g ), t.b );",
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" vec3 Cbottom = texture2D( colorTex, offset[1].zw ).rgb;",
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" t = abs( C - Cbottom );",
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" delta.w = max( max( t.r, t.g ), t.b );",
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// Calculate the maximum delta in the direct neighborhood:
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" float maxDelta = max( max( max( delta.x, delta.y ), delta.z ), delta.w );",
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// Calculate left-left and top-top deltas:
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" vec3 Cleftleft = texture2D( colorTex, offset[2].xy ).rgb;",
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" t = abs( C - Cleftleft );",
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" delta.z = max( max( t.r, t.g ), t.b );",
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" vec3 Ctoptop = texture2D( colorTex, offset[2].zw ).rgb;",
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" t = abs( C - Ctoptop );",
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" delta.w = max( max( t.r, t.g ), t.b );",
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// Calculate the final maximum delta:
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" maxDelta = max( max( maxDelta, delta.z ), delta.w );",
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// Local contrast adaptation in action:
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" edges.xy *= step( 0.5 * maxDelta, delta.xy );",
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" return vec4( edges, 0.0, 0.0 );",
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"}",
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"void main() {",
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" gl_FragColor = SMAAColorEdgeDetectionPS( vUv, vOffset, tDiffuse );",
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"}"
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].join( "\n" )
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};
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THREE.SMAAWeightsShader = {
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defines: {
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"SMAA_MAX_SEARCH_STEPS": "8",
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"SMAA_AREATEX_MAX_DISTANCE": "16",
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"SMAA_AREATEX_PIXEL_SIZE": "( 1.0 / vec2( 160.0, 560.0 ) )",
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"SMAA_AREATEX_SUBTEX_SIZE": "( 1.0 / 7.0 )"
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},
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uniforms: {
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"tDiffuse": { value: null },
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"tArea": { value: null },
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"tSearch": { value: null },
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"resolution": { value: new THREE.Vector2( 1 / 1024, 1 / 512 ) }
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},
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vertexShader: [
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"uniform vec2 resolution;",
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"varying vec2 vUv;",
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"varying vec4 vOffset[ 3 ];",
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"varying vec2 vPixcoord;",
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"void SMAABlendingWeightCalculationVS( vec2 texcoord ) {",
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" vPixcoord = texcoord / resolution;",
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// We will use these offsets for the searches later on (see @PSEUDO_GATHER4):
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" vOffset[ 0 ] = texcoord.xyxy + resolution.xyxy * vec4( -0.25, 0.125, 1.25, 0.125 );", // WebGL port note: Changed sign in Y and W components
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" vOffset[ 1 ] = texcoord.xyxy + resolution.xyxy * vec4( -0.125, 0.25, -0.125, -1.25 );", // WebGL port note: Changed sign in Y and W components
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// And these for the searches, they indicate the ends of the loops:
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" vOffset[ 2 ] = vec4( vOffset[ 0 ].xz, vOffset[ 1 ].yw ) + vec4( -2.0, 2.0, -2.0, 2.0 ) * resolution.xxyy * float( SMAA_MAX_SEARCH_STEPS );",
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"}",
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"void main() {",
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" vUv = uv;",
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" SMAABlendingWeightCalculationVS( vUv );",
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" gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
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"}"
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].join( "\n" ),
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fragmentShader: [
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"#define SMAASampleLevelZeroOffset( tex, coord, offset ) texture2D( tex, coord + float( offset ) * resolution, 0.0 )",
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"uniform sampler2D tDiffuse;",
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"uniform sampler2D tArea;",
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"uniform sampler2D tSearch;",
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"uniform vec2 resolution;",
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"varying vec2 vUv;",
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"varying vec4 vOffset[3];",
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"varying vec2 vPixcoord;",
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"#if __VERSION__ == 100",
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"vec2 round( vec2 x ) {",
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" return sign( x ) * floor( abs( x ) + 0.5 );",
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"}",
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"#endif",
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"float SMAASearchLength( sampler2D searchTex, vec2 e, float bias, float scale ) {",
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// Not required if searchTex accesses are set to point:
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// float2 SEARCH_TEX_PIXEL_SIZE = 1.0 / float2(66.0, 33.0);
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// e = float2(bias, 0.0) + 0.5 * SEARCH_TEX_PIXEL_SIZE +
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// e * float2(scale, 1.0) * float2(64.0, 32.0) * SEARCH_TEX_PIXEL_SIZE;
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" e.r = bias + e.r * scale;",
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" return 255.0 * texture2D( searchTex, e, 0.0 ).r;",
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"}",
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"float SMAASearchXLeft( sampler2D edgesTex, sampler2D searchTex, vec2 texcoord, float end ) {",
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/**
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* @PSEUDO_GATHER4
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* This texcoord has been offset by (-0.25, -0.125) in the vertex shader to
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* sample between edge, thus fetching four edges in a row.
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* Sampling with different offsets in each direction allows to disambiguate
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* which edges are active from the four fetched ones.
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*/
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" vec2 e = vec2( 0.0, 1.0 );",
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" for ( int i = 0; i < SMAA_MAX_SEARCH_STEPS; i ++ ) {", // WebGL port note: Changed while to for
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" e = texture2D( edgesTex, texcoord, 0.0 ).rg;",
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" texcoord -= vec2( 2.0, 0.0 ) * resolution;",
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" if ( ! ( texcoord.x > end && e.g > 0.8281 && e.r == 0.0 ) ) break;",
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" }",
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// We correct the previous (-0.25, -0.125) offset we applied:
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" texcoord.x += 0.25 * resolution.x;",
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// The searches are bias by 1, so adjust the coords accordingly:
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" texcoord.x += resolution.x;",
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// Disambiguate the length added by the last step:
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" texcoord.x += 2.0 * resolution.x;", // Undo last step
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" texcoord.x -= resolution.x * SMAASearchLength(searchTex, e, 0.0, 0.5);",
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" return texcoord.x;",
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"}",
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"float SMAASearchXRight( sampler2D edgesTex, sampler2D searchTex, vec2 texcoord, float end ) {",
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" vec2 e = vec2( 0.0, 1.0 );",
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" for ( int i = 0; i < SMAA_MAX_SEARCH_STEPS; i ++ ) {", // WebGL port note: Changed while to for
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" e = texture2D( edgesTex, texcoord, 0.0 ).rg;",
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" texcoord += vec2( 2.0, 0.0 ) * resolution;",
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" if ( ! ( texcoord.x < end && e.g > 0.8281 && e.r == 0.0 ) ) break;",
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" }",
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" texcoord.x -= 0.25 * resolution.x;",
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" texcoord.x -= resolution.x;",
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" texcoord.x -= 2.0 * resolution.x;",
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" texcoord.x += resolution.x * SMAASearchLength( searchTex, e, 0.5, 0.5 );",
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" return texcoord.x;",
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"}",
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"float SMAASearchYUp( sampler2D edgesTex, sampler2D searchTex, vec2 texcoord, float end ) {",
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" vec2 e = vec2( 1.0, 0.0 );",
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" for ( int i = 0; i < SMAA_MAX_SEARCH_STEPS; i ++ ) {", // WebGL port note: Changed while to for
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" e = texture2D( edgesTex, texcoord, 0.0 ).rg;",
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" texcoord += vec2( 0.0, 2.0 ) * resolution;", // WebGL port note: Changed sign
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" if ( ! ( texcoord.y > end && e.r > 0.8281 && e.g == 0.0 ) ) break;",
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" }",
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" texcoord.y -= 0.25 * resolution.y;", // WebGL port note: Changed sign
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" texcoord.y -= resolution.y;", // WebGL port note: Changed sign
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" texcoord.y -= 2.0 * resolution.y;", // WebGL port note: Changed sign
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" texcoord.y += resolution.y * SMAASearchLength( searchTex, e.gr, 0.0, 0.5 );", // WebGL port note: Changed sign
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" return texcoord.y;",
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"}",
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"float SMAASearchYDown( sampler2D edgesTex, sampler2D searchTex, vec2 texcoord, float end ) {",
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" vec2 e = vec2( 1.0, 0.0 );",
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" for ( int i = 0; i < SMAA_MAX_SEARCH_STEPS; i ++ ) {", // WebGL port note: Changed while to for
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" e = texture2D( edgesTex, texcoord, 0.0 ).rg;",
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" texcoord -= vec2( 0.0, 2.0 ) * resolution;", // WebGL port note: Changed sign
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" if ( ! ( texcoord.y < end && e.r > 0.8281 && e.g == 0.0 ) ) break;",
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" }",
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" texcoord.y += 0.25 * resolution.y;", // WebGL port note: Changed sign
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" texcoord.y += resolution.y;", // WebGL port note: Changed sign
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" texcoord.y += 2.0 * resolution.y;", // WebGL port note: Changed sign
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" texcoord.y -= resolution.y * SMAASearchLength( searchTex, e.gr, 0.5, 0.5 );", // WebGL port note: Changed sign
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" return texcoord.y;",
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"}",
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"vec2 SMAAArea( sampler2D areaTex, vec2 dist, float e1, float e2, float offset ) {",
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// Rounding prevents precision errors of bilinear filtering:
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" vec2 texcoord = float( SMAA_AREATEX_MAX_DISTANCE ) * round( 4.0 * vec2( e1, e2 ) ) + dist;",
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// We do a scale and bias for mapping to texel space:
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" texcoord = SMAA_AREATEX_PIXEL_SIZE * texcoord + ( 0.5 * SMAA_AREATEX_PIXEL_SIZE );",
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// Move to proper place, according to the subpixel offset:
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" texcoord.y += SMAA_AREATEX_SUBTEX_SIZE * offset;",
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" return texture2D( areaTex, texcoord, 0.0 ).rg;",
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"}",
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"vec4 SMAABlendingWeightCalculationPS( vec2 texcoord, vec2 pixcoord, vec4 offset[ 3 ], sampler2D edgesTex, sampler2D areaTex, sampler2D searchTex, ivec4 subsampleIndices ) {",
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" vec4 weights = vec4( 0.0, 0.0, 0.0, 0.0 );",
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" vec2 e = texture2D( edgesTex, texcoord ).rg;",
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" if ( e.g > 0.0 ) {", // Edge at north
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" vec2 d;",
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// Find the distance to the left:
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" vec2 coords;",
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" coords.x = SMAASearchXLeft( edgesTex, searchTex, offset[ 0 ].xy, offset[ 2 ].x );",
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" coords.y = offset[ 1 ].y;", // offset[1].y = texcoord.y - 0.25 * resolution.y (@CROSSING_OFFSET)
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" d.x = coords.x;",
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// Now fetch the left crossing edges, two at a time using bilinear
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// filtering. Sampling at -0.25 (see @CROSSING_OFFSET) enables to
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// discern what value each edge has:
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" float e1 = texture2D( edgesTex, coords, 0.0 ).r;",
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// Find the distance to the right:
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" coords.x = SMAASearchXRight( edgesTex, searchTex, offset[ 0 ].zw, offset[ 2 ].y );",
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" d.y = coords.x;",
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// We want the distances to be in pixel units (doing this here allow to
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// better interleave arithmetic and memory accesses):
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" d = d / resolution.x - pixcoord.x;",
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// SMAAArea below needs a sqrt, as the areas texture is compressed
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// quadratically:
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" vec2 sqrt_d = sqrt( abs( d ) );",
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// Fetch the right crossing edges:
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" coords.y -= 1.0 * resolution.y;", // WebGL port note: Added
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" float e2 = SMAASampleLevelZeroOffset( edgesTex, coords, ivec2( 1, 0 ) ).r;",
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// Ok, we know how this pattern looks like, now it is time for getting
|
||
|
|
// the actual area:
|
||
|
|
" weights.rg = SMAAArea( areaTex, sqrt_d, e1, e2, float( subsampleIndices.y ) );",
|
||
|
|
" }",
|
||
|
|
|
||
|
|
" if ( e.r > 0.0 ) {", // Edge at west
|
||
|
|
" vec2 d;",
|
||
|
|
|
||
|
|
// Find the distance to the top:
|
||
|
|
" vec2 coords;",
|
||
|
|
|
||
|
|
" coords.y = SMAASearchYUp( edgesTex, searchTex, offset[ 1 ].xy, offset[ 2 ].z );",
|
||
|
|
" coords.x = offset[ 0 ].x;", // offset[1].x = texcoord.x - 0.25 * resolution.x;
|
||
|
|
" d.x = coords.y;",
|
||
|
|
|
||
|
|
// Fetch the top crossing edges:
|
||
|
|
" float e1 = texture2D( edgesTex, coords, 0.0 ).g;",
|
||
|
|
|
||
|
|
// Find the distance to the bottom:
|
||
|
|
" coords.y = SMAASearchYDown( edgesTex, searchTex, offset[ 1 ].zw, offset[ 2 ].w );",
|
||
|
|
" d.y = coords.y;",
|
||
|
|
|
||
|
|
// We want the distances to be in pixel units:
|
||
|
|
" d = d / resolution.y - pixcoord.y;",
|
||
|
|
|
||
|
|
// SMAAArea below needs a sqrt, as the areas texture is compressed
|
||
|
|
// quadratically:
|
||
|
|
" vec2 sqrt_d = sqrt( abs( d ) );",
|
||
|
|
|
||
|
|
// Fetch the bottom crossing edges:
|
||
|
|
" coords.y -= 1.0 * resolution.y;", // WebGL port note: Added
|
||
|
|
" float e2 = SMAASampleLevelZeroOffset( edgesTex, coords, ivec2( 0, 1 ) ).g;",
|
||
|
|
|
||
|
|
// Get the area for this direction:
|
||
|
|
" weights.ba = SMAAArea( areaTex, sqrt_d, e1, e2, float( subsampleIndices.x ) );",
|
||
|
|
" }",
|
||
|
|
|
||
|
|
" return weights;",
|
||
|
|
"}",
|
||
|
|
|
||
|
|
"void main() {",
|
||
|
|
|
||
|
|
" gl_FragColor = SMAABlendingWeightCalculationPS( vUv, vPixcoord, vOffset, tDiffuse, tArea, tSearch, ivec4( 0.0 ) );",
|
||
|
|
|
||
|
|
"}"
|
||
|
|
|
||
|
|
].join( "\n" )
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
THREE.SMAABlendShader = {
|
||
|
|
|
||
|
|
uniforms: {
|
||
|
|
|
||
|
|
"tDiffuse": { value: null },
|
||
|
|
"tColor": { value: null },
|
||
|
|
"resolution": { value: new THREE.Vector2( 1 / 1024, 1 / 512 ) }
|
||
|
|
|
||
|
|
},
|
||
|
|
|
||
|
|
vertexShader: [
|
||
|
|
|
||
|
|
"uniform vec2 resolution;",
|
||
|
|
|
||
|
|
"varying vec2 vUv;",
|
||
|
|
"varying vec4 vOffset[ 2 ];",
|
||
|
|
|
||
|
|
"void SMAANeighborhoodBlendingVS( vec2 texcoord ) {",
|
||
|
|
" vOffset[ 0 ] = texcoord.xyxy + resolution.xyxy * vec4( -1.0, 0.0, 0.0, 1.0 );", // WebGL port note: Changed sign in W component
|
||
|
|
" vOffset[ 1 ] = texcoord.xyxy + resolution.xyxy * vec4( 1.0, 0.0, 0.0, -1.0 );", // WebGL port note: Changed sign in W component
|
||
|
|
"}",
|
||
|
|
|
||
|
|
"void main() {",
|
||
|
|
|
||
|
|
" vUv = uv;",
|
||
|
|
|
||
|
|
" SMAANeighborhoodBlendingVS( vUv );",
|
||
|
|
|
||
|
|
" gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
|
||
|
|
|
||
|
|
"}"
|
||
|
|
|
||
|
|
].join( "\n" ),
|
||
|
|
|
||
|
|
fragmentShader: [
|
||
|
|
|
||
|
|
"uniform sampler2D tDiffuse;",
|
||
|
|
"uniform sampler2D tColor;",
|
||
|
|
"uniform vec2 resolution;",
|
||
|
|
|
||
|
|
"varying vec2 vUv;",
|
||
|
|
"varying vec4 vOffset[ 2 ];",
|
||
|
|
|
||
|
|
"vec4 SMAANeighborhoodBlendingPS( vec2 texcoord, vec4 offset[ 2 ], sampler2D colorTex, sampler2D blendTex ) {",
|
||
|
|
// Fetch the blending weights for current pixel:
|
||
|
|
" vec4 a;",
|
||
|
|
" a.xz = texture2D( blendTex, texcoord ).xz;",
|
||
|
|
" a.y = texture2D( blendTex, offset[ 1 ].zw ).g;",
|
||
|
|
" a.w = texture2D( blendTex, offset[ 1 ].xy ).a;",
|
||
|
|
|
||
|
|
// Is there any blending weight with a value greater than 0.0?
|
||
|
|
" if ( dot(a, vec4( 1.0, 1.0, 1.0, 1.0 )) < 1e-5 ) {",
|
||
|
|
" return texture2D( colorTex, texcoord, 0.0 );",
|
||
|
|
" } else {",
|
||
|
|
// Up to 4 lines can be crossing a pixel (one through each edge). We
|
||
|
|
// favor blending by choosing the line with the maximum weight for each
|
||
|
|
// direction:
|
||
|
|
" vec2 offset;",
|
||
|
|
" offset.x = a.a > a.b ? a.a : -a.b;", // left vs. right
|
||
|
|
" offset.y = a.g > a.r ? -a.g : a.r;", // top vs. bottom // WebGL port note: Changed signs
|
||
|
|
|
||
|
|
// Then we go in the direction that has the maximum weight:
|
||
|
|
" if ( abs( offset.x ) > abs( offset.y )) {", // horizontal vs. vertical
|
||
|
|
" offset.y = 0.0;",
|
||
|
|
" } else {",
|
||
|
|
" offset.x = 0.0;",
|
||
|
|
" }",
|
||
|
|
|
||
|
|
// Fetch the opposite color and lerp by hand:
|
||
|
|
" vec4 C = texture2D( colorTex, texcoord, 0.0 );",
|
||
|
|
" texcoord += sign( offset ) * resolution;",
|
||
|
|
" vec4 Cop = texture2D( colorTex, texcoord, 0.0 );",
|
||
|
|
" float s = abs( offset.x ) > abs( offset.y ) ? abs( offset.x ) : abs( offset.y );",
|
||
|
|
|
||
|
|
// WebGL port note: Added gamma correction
|
||
|
|
" C.xyz = pow(C.xyz, vec3(2.2));",
|
||
|
|
" Cop.xyz = pow(Cop.xyz, vec3(2.2));",
|
||
|
|
" vec4 mixed = mix(C, Cop, s);",
|
||
|
|
" mixed.xyz = pow(mixed.xyz, vec3(1.0 / 2.2));",
|
||
|
|
|
||
|
|
" return mixed;",
|
||
|
|
" }",
|
||
|
|
"}",
|
||
|
|
|
||
|
|
"void main() {",
|
||
|
|
|
||
|
|
" gl_FragColor = SMAANeighborhoodBlendingPS( vUv, vOffset, tColor, tDiffuse );",
|
||
|
|
|
||
|
|
"}"
|
||
|
|
|
||
|
|
].join( "\n" )
|
||
|
|
|
||
|
|
};
|