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import { Return, VariableDeclaration, Accessor } from './AST.js';
import GLSLDecoder from './GLSLDecoder.js';
class ShaderToyDecoder extends GLSLDecoder {
constructor() {
super();
this.addPolyfill( 'iTime', 'float iTime = time;' );
this.addPolyfill( 'iResolution', 'vec2 iResolution = screenSize;' );
this.addPolyfill( 'fragCoord', 'vec3 fragCoord = vec3( screenCoordinate.x, screenSize.y - screenCoordinate.y, screenCoordinate.z );' );
}
parseFunction() {
const node = super.parseFunction();
if ( node.name === 'mainImage' ) {
node.params = []; // remove default parameters
node.type = 'vec4';
node.layout = false; // for now
const fragColor = new Accessor( 'fragColor' );
for ( const subNode of node.body ) {
if ( subNode.isReturn ) {
subNode.value = fragColor;
}
}
node.body.unshift( new VariableDeclaration( 'vec4', 'fragColor' ) );
node.body.push( new Return( fragColor ) );
}
return node;
}
}
export default ShaderToyDecoder;
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