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87 lines
2.7 KiB
87 lines
2.7 KiB
// Copyright 2023 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math' as math;
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import 'dart:ui' as ui;
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import 'package:flutter/material.dart';
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import 'package:vector_math/vector_math_64.dart' as v64;
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import 'orb_shader_config.dart';
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class OrbShaderPainter extends CustomPainter {
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OrbShaderPainter(
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this.shader, {
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required this.config,
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required this.time,
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required this.mousePos,
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required this.energy,
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});
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final ui.FragmentShader shader;
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final OrbShaderConfig config;
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final double time;
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final Offset mousePos;
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final double energy;
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@override
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void paint(Canvas canvas, Size size) {
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double fov =
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v64.mix(math.pi / 4.3, math.pi / 2.0, config.zoom.clamp(0.0, 1.0));
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v64.Vector3 colorToVector3(Color c) =>
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v64.Vector3(
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c.red.toDouble(),
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c.green.toDouble(),
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c.blue.toDouble(),
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) /
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255.0;
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v64.Vector3 lightLumP = colorToVector3(config.lightColor).normalized() *
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math.max(0.0, config.lightBrightness);
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v64.Vector3 albedo = colorToVector3(config.materialColor);
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v64.Vector3 ambientLight = colorToVector3(config.ambientLightColor) *
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math.max(0.0, config.ambientLightBrightness);
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shader.setFloat(0, size.width);
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shader.setFloat(1, size.height);
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shader.setFloat(2, time);
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shader.setFloat(3, math.max(0.0, config.exposure));
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shader.setFloat(4, fov);
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shader.setFloat(5, config.roughness.clamp(0.0, 1.0));
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shader.setFloat(6, config.metalness.clamp(0.0, 1.0));
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shader.setFloat(7, config.lightOffsetX);
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shader.setFloat(8, config.lightOffsetY);
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shader.setFloat(9, config.lightOffsetZ);
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shader.setFloat(10, config.lightRadius);
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shader.setFloat(11, lightLumP.x);
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shader.setFloat(12, lightLumP.y);
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shader.setFloat(13, lightLumP.z);
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shader.setFloat(14, albedo.x);
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shader.setFloat(15, albedo.y);
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shader.setFloat(16, albedo.z);
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shader.setFloat(17, config.ior.clamp(0.0, 2.0));
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shader.setFloat(18, config.lightAttenuation.clamp(0.0, 1.0));
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shader.setFloat(19, ambientLight.x);
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shader.setFloat(20, ambientLight.y);
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shader.setFloat(21, ambientLight.z);
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shader.setFloat(22, config.ambientLightDepthFactor.clamp(0.0, 1.0));
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shader.setFloat(23, energy);
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canvas.drawRect(
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Rect.fromLTWH(0, 0, size.width, size.height),
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Paint()..shader = shader,
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);
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}
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@override
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bool shouldRepaint(covariant OrbShaderPainter oldDelegate) {
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return oldDelegate.shader != shader ||
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oldDelegate.config != config ||
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oldDelegate.time != time ||
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oldDelegate.mousePos != mousePos ||
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oldDelegate.energy != energy;
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}
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}
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