playcanvas/build/playcanvas/src/extras/render-passes/render-pass-coc.js

PlayCanvas WebGL game engine

import { SHADERLANGUAGE_GLSL, SHADERLANGUAGE_WGSL, SEMANTIC_POSITION } from '../../platform/graphics/constants.js';
import { PROJECTION_ORTHOGRAPHIC } from '../../scene/constants.js';
import { RenderPassShaderQuad } from '../../scene/graphics/render-pass-shader-quad.js';
import { ShaderUtils } from '../../scene/shader-lib/shader-utils.js';
import glslCocPS from '../../scene/shader-lib/glsl/chunks/render-pass/frag/coc.js';
import wgslCocPS from '../../scene/shader-lib/wgsl/chunks/render-pass/frag/coc.js';
import { ShaderChunks } from '../../scene/shader-lib/shader-chunks.js';

class RenderPassCoC extends RenderPassShaderQuad {
		constructor(device, cameraComponent, nearBlur){
				super(device);
				this.cameraComponent = cameraComponent;
				ShaderChunks.get(device, SHADERLANGUAGE_GLSL).set('cocPS', glslCocPS);
				ShaderChunks.get(device, SHADERLANGUAGE_WGSL).set('cocPS', wgslCocPS);
				const defines = new Map();
				if (nearBlur) defines.set('NEAR_BLUR', '');
				ShaderUtils.addScreenDepthChunkDefines(device, cameraComponent.shaderParams, defines);
				this.shader = ShaderUtils.createShader(device, {
						uniqueName: `CocShader-${nearBlur}`,
						attributes: {
								aPosition: SEMANTIC_POSITION
						},
						vertexChunk: 'quadVS',
						fragmentChunk: 'cocPS',
						fragmentDefines: defines
				});
				this.paramsId = device.scope.resolve('params');
				this.paramsValue = new Float32Array(3);
				this.cameraParams = new Float32Array(4);
				this.cameraParamsId = device.scope.resolve('camera_params');
		}
		execute() {
				const { paramsValue, focusRange } = this;
				paramsValue[0] = this.focusDistance + 0.001;
				paramsValue[1] = focusRange;
				paramsValue[2] = 1 / focusRange;
				this.paramsId.setValue(paramsValue);
				const camera = this.cameraComponent.camera;
				const f = camera._farClip;
				this.cameraParams[0] = 1 / f;
				this.cameraParams[1] = f;
				this.cameraParams[2] = camera._nearClip;
				this.cameraParams[3] = camera.projection === PROJECTION_ORTHOGRAPHIC ? 1 : 0;
				this.cameraParamsId.setValue(this.cameraParams);
				super.execute();
		}
}

export { RenderPassCoC };