@openhps/core
Version:
Open Hybrid Positioning System - Core component
157 lines (132 loc) • 5.39 kB
JavaScript
import { BackSide, LinearFilter, LinearMipmapLinearFilter, NoBlending } from '../constants.js';
import { Mesh } from '../objects/Mesh.js';
import { BoxGeometry } from '../geometries/BoxGeometry.js';
import { ShaderMaterial } from '../materials/ShaderMaterial.js';
import { cloneUniforms } from './shaders/UniformsUtils.js';
import { WebGLRenderTarget } from './WebGLRenderTarget.js';
import { CubeCamera } from '../cameras/CubeCamera.js';
import { CubeTexture } from '../textures/CubeTexture.js';
/**
* A cube render target used in context of {@link WebGLRenderer}.
*
* @augments WebGLRenderTarget
*/
class WebGLCubeRenderTarget extends WebGLRenderTarget {
/**
* Constructs a new cube render target.
*
* @param {number} [size=1] - The size of the render target.
* @param {RenderTarget~Options} [options] - The configuration object.
*/
constructor(size = 1, options = {}) {
super(size, size, options);
/**
* This flag can be used for type testing.
*
* @type {boolean}
* @readonly
* @default true
*/
this.isWebGLCubeRenderTarget = true;
const image = {
width: size,
height: size,
depth: 1
};
const images = [image, image, image, image, image, image];
/**
* Overwritten with a different texture type.
*
* @type {DataArrayTexture}
*/
this.texture = new CubeTexture(images, options.mapping, options.wrapS, options.wrapT, options.magFilter, options.minFilter, options.format, options.type, options.anisotropy, options.colorSpace);
// By convention -- likely based on the RenderMan spec from the 1990's -- cube maps are specified by WebGL (and three.js)
// in a coordinate system in which positive-x is to the right when looking up the positive-z axis -- in other words,
// in a left-handed coordinate system. By continuing this convention, preexisting cube maps continued to render correctly.
// three.js uses a right-handed coordinate system. So environment maps used in three.js appear to have px and nx swapped
// and the flag isRenderTargetTexture controls this conversion. The flip is not required when using WebGLCubeRenderTarget.texture
// as a cube texture (this is detected when isRenderTargetTexture is set to true for cube textures).
this.texture.isRenderTargetTexture = true;
this.texture.generateMipmaps = options.generateMipmaps !== undefined ? options.generateMipmaps : false;
this.texture.minFilter = options.minFilter !== undefined ? options.minFilter : LinearFilter;
}
/**
* Converts the given equirectangular texture to a cube map.
*
* @param {WebGLRenderer} renderer - The renderer.
* @param {Texture} texture - The equirectangular texture.
* @return {WebGLCubeRenderTarget} A reference to this cube render target.
*/
fromEquirectangularTexture(renderer, texture) {
this.texture.type = texture.type;
this.texture.colorSpace = texture.colorSpace;
this.texture.generateMipmaps = texture.generateMipmaps;
this.texture.minFilter = texture.minFilter;
this.texture.magFilter = texture.magFilter;
const shader = {
uniforms: {
tEquirect: {
value: null
}
},
vertexShader: /* glsl */`
varying vec3 vWorldDirection;
vec3 transformDirection( in vec3 dir, in mat4 matrix ) {
return normalize( ( matrix * vec4( dir, 0.0 ) ).xyz );
}
void main() {
vWorldDirection = transformDirection( position, modelMatrix );
#include <begin_vertex>
#include <project_vertex>
}
`,
fragmentShader: /* glsl */`
uniform sampler2D tEquirect;
varying vec3 vWorldDirection;
#include <common>
void main() {
vec3 direction = normalize( vWorldDirection );
vec2 sampleUV = equirectUv( direction );
gl_FragColor = texture2D( tEquirect, sampleUV );
}
`
};
const geometry = new BoxGeometry(5, 5, 5);
const material = new ShaderMaterial({
name: 'CubemapFromEquirect',
uniforms: cloneUniforms(shader.uniforms),
vertexShader: shader.vertexShader,
fragmentShader: shader.fragmentShader,
side: BackSide,
blending: NoBlending
});
material.uniforms.tEquirect.value = texture;
const mesh = new Mesh(geometry, material);
const currentMinFilter = texture.minFilter;
// Avoid blurred poles
if (texture.minFilter === LinearMipmapLinearFilter) texture.minFilter = LinearFilter;
const camera = new CubeCamera(1, 10, this);
camera.update(renderer, mesh);
texture.minFilter = currentMinFilter;
mesh.geometry.dispose();
mesh.material.dispose();
return this;
}
/**
* Clears this cube render target.
*
* @param {WebGLRenderer} renderer - The renderer.
* @param {boolean} [color=true] - Whether the color buffer should be cleared or not.
* @param {boolean} [depth=true] - Whether the depth buffer should be cleared or not.
* @param {boolean} [stencil=true] - Whether the stencil buffer should be cleared or not.
*/
clear(renderer, color = true, depth = true, stencil = true) {
const currentRenderTarget = renderer.getRenderTarget();
for (let i = 0; i < 6; i++) {
renderer.setRenderTarget(this, i);
renderer.clear(color, depth, stencil);
}
renderer.setRenderTarget(currentRenderTarget);
}
}
export { WebGLCubeRenderTarget };