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// Copyright 2018 The Immersive Web Community Group
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
/*
Node for displaying 360 equirect images as a skybox.
*/
import {Material, RENDER_ORDER} from '../core/material.js';
import {Primitive, PrimitiveAttribute} from '../core/primitive.js';
import {Node} from '../core/node.js';
import {UrlTexture} from '../core/texture.js';
const GL = WebGLRenderingContext; // For enums
class SkyboxMaterial extends Material {
constructor() {
super();
this.renderOrder = RENDER_ORDER.SKY;
this.state.depthFunc = GL.LEQUAL;
this.state.depthMask = false;
this.image = this.defineSampler('diffuse');
this.texCoordScaleOffset = this.defineUniform('texCoordScaleOffset',
[1.0, 1.0, 0.0, 0.0,
1.0, 1.0, 0.0, 0.0], 4);
}
get materialName() {
return 'SKYBOX';
}
get vertexSource() {
return `
uniform int EYE_INDEX;
uniform vec4 texCoordScaleOffset[2];
attribute vec3 POSITION;
attribute vec2 TEXCOORD_0;
varying vec2 vTexCoord;
vec4 vertex_main(mat4 proj, mat4 view, mat4 model) {
vec4 scaleOffset = texCoordScaleOffset[EYE_INDEX];
vTexCoord = (TEXCOORD_0 * scaleOffset.xy) + scaleOffset.zw;
// Drop the translation portion of the view matrix
view[3].xyz = vec3(0.0, 0.0, 0.0);
vec4 out_vec = proj * view * model * vec4(POSITION, 1.0);
// Returning the W component for both Z and W forces the geometry depth to
// the far plane. When combined with a depth func of LEQUAL this makes the
// sky write to any depth fragment that has not been written to yet.
return out_vec.xyww;
}`;
}
get fragmentSource() {
return `
uniform sampler2D diffuse;
varying vec2 vTexCoord;
vec4 fragment_main() {
return texture2D(diffuse, vTexCoord);
}`;
}
}
export class SkyboxNode extends Node {
constructor(options) {
super();
this._url = options.url;
this._displayMode = options.displayMode || 'mono';
this._rotationY = options.rotationY || 0;
}
onRendererChanged(renderer) {
let vertices = [];
let indices = [];
let latSegments = 40;
let lonSegments = 40;
// Create the vertices/indices
for (let i=0; i <= latSegments; ++i) {
let theta = i * Math.PI / latSegments;
let sinTheta = Math.sin(theta);
let cosTheta = Math.cos(theta);
let idxOffsetA = i * (lonSegments+1);
let idxOffsetB = (i+1) * (lonSegments+1);
for (let j=0; j <= lonSegments; ++j) {
let phi = (j * 2 * Math.PI / lonSegments) + this._rotationY;
let x = Math.sin(phi) * sinTheta;
let y = cosTheta;
let z = -Math.cos(phi) * sinTheta;
let u = (j / lonSegments);
let v = (i / latSegments);
// Vertex shader will force the geometry to the far plane, so the
// radius of the sphere is immaterial.
vertices.push(x, y, z, u, v);
if (i < latSegments && j < lonSegments) {
let idxA = idxOffsetA+j;
let idxB = idxOffsetB+j;
indices.push(idxA, idxB, idxA+1,
idxB, idxB+1, idxA+1);
}
}
}
let vertexBuffer = renderer.createRenderBuffer(GL.ARRAY_BUFFER, new Float32Array(vertices));
let indexBuffer = renderer.createRenderBuffer(GL.ELEMENT_ARRAY_BUFFER, new Uint16Array(indices));
let attribs = [
new PrimitiveAttribute('POSITION', vertexBuffer, 3, GL.FLOAT, 20, 0),
new PrimitiveAttribute('TEXCOORD_0', vertexBuffer, 2, GL.FLOAT, 20, 12),
];
let primitive = new Primitive(attribs, indices.length);
primitive.setIndexBuffer(indexBuffer);
let material = new SkyboxMaterial();
material.image.texture = new UrlTexture(this._url);
switch (this._displayMode) {
case 'mono':
material.texCoordScaleOffset.value = [1.0, 1.0, 0.0, 0.0,
1.0, 1.0, 0.0, 0.0];
break;
case 'stereoTopBottom':
material.texCoordScaleOffset.value = [1.0, 0.5, 0.0, 0.0,
1.0, 0.5, 0.0, 0.5];
break;
case 'stereoLeftRight':
material.texCoordScaleOffset.value = [0.5, 1.0, 0.0, 0.0,
0.5, 1.0, 0.5, 0.0];
break;
}
let renderPrimitive = renderer.createRenderPrimitive(primitive, material);
this.addRenderPrimitive(renderPrimitive);
}
}
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