import { Utils } from "../core/Utils";
import { BlendMode } from "../rendering/BlendMode";
import { BaseRenderer } from "./BaseRenderer";
/**
* @typedef {Object} NormalMapRendererConfig
* @extends {RendererConfig}
* @property {TextureInfo} heightMap
*/
/**
* <pre>
* Normal map renderer
* - Renders a normal map from height map texture
* </pre>
* @extends {BaseRenderer}
*/
export class NormalMapRenderer extends BaseRenderer {
/**
* Creates an instance of NormalMapRenderer.
* @constructor
* @param {NormalMapRendererConfig} config
*/
constructor(config = {}) {
config = Utils.initRendererConfig(config);
// prettier-ignore
Utils.setLocations(config, [
"uF"
]);
super(config);
this.heightMap = config.heightMap;
}
/**
* @ignore
*/
$render() {
const { $locations } = this;
this.context.setBlendMode(BlendMode.NORMAL);
this.$useTextureAt(this.heightMap, $locations.uB, 0);
this.$gl.uniform2f($locations.uF, this.width, this.height);
this.$uploadBuffers();
this.$drawInstanced(1);
}
// prettier-ignore
/**
* @returns {string}
* @ignore
*/
$createVertexShader() {
return `${Utils.GLSL.BASE_VERTEX_SHADER_INITIALIZATION}` +
`out vec2 ` +
`v0;` +
`void main(){` +
`${Utils.GLSL.BASE_VERTEX_SHADER}` +
`v0=${Utils.GLSL.BASE_VERTEX_SHADER_POSITION};` +
`}`;
}
// prettier-ignore
/**
* @returns {string}
* @ignore
*/
$createFragmentShader() {
return `${Utils.GLSL.DEFINE.Z}` +
`${Utils.GLSL.DEFINE.HEIGHT}` +
`in vec2 ` +
`v0;` +
`uniform vec2 ` +
`uF;` +
`uniform sampler2D ` +
`uB;` +
`out vec4 ` +
`oCl;` +
`void main(){` +
`vec2 ` +
`ts=floor(uF),` +
`p0=floor(v0.xy*ts);` +
`ivec2 ` +
`mn=ivec2(Z.xx),` +
`mx=ivec2(ts)-1;` +
`float ` +
`hL=texelFetch(uB,clamp(ivec2(p0+Z.zx),mn,mx),0).g,` +
`hR=texelFetch(uB,clamp(ivec2(p0+Z.yx),mn,mx),0).g,` +
`hU=texelFetch(uB,clamp(ivec2(p0+Z.xz),mn,mx),0).g,` +
`hD=texelFetch(uB,clamp(ivec2(p0+Z.xy),mn,mx),0).g;` +
`vec3 ` +
`nm=normalize(` +
`cross(` +
`vec3(1,0,(hR-hL)*.5*HEIGHT),` +
`vec3(0,1,(hD-hU)*.5*HEIGHT)` +
`)` +
`)*Z.yzy;` +
`oCl=vec4(nm*.5+.5,1);` +
`}`;
}
}
Extensions