smaaBlendShader top-level property

Map<String, dynamic> smaaBlendShader

Implementation

final Map<String,dynamic> smaaBlendShader = {
	'name': 'SMAABlendShader',
	'uniforms': {
		'tDiffuse': { 'value': null },
		'tColor': { 'value': null },
		'resolution': { 'value': Vector2( 1 / 1024, 1 / 512 ) }
	},
	'vertexShader': /* glsl */'''

		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 );

		}''',

	'fragmentShader': /* glsl */'''

		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 );

		}'''

};