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playcanvas

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PlayCanvas WebGL game engine

playcanvas.com

playcanvas/engine

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declare const _default: "\nfn saturate(x: f32) -> f32 {\n return clamp(x, 0.0, 1.0);\n}\n\nfn unpack3NFloats(src: f32) -> vec3f {\n let r = fract(src);\n let g = fract(src * 256.0);\n let b = fract(src * 65536.0);\n return vec3f(r, g, b);\n}\n\n// Struct to handle multiple return values from tex1Dlod_lerp\nstruct TexLerpUnpackResult {\n result: vec3f,\n unpacked: vec3f\n}\n\nfn tex1Dlod_lerp(tex: texture_2d<f32>, texSampler: sampler, tc: vec2f) -> TexLerpUnpackResult {\n let tc_next = tc + vec2f(uniform.graphSampleSize);\n let a = textureSampleLevel(tex, texSampler, tc, 0.0);\n let b = textureSampleLevel(tex, texSampler, tc_next, 0.0);\n let c = fract(tc.x * uniform.graphNumSamples);\n\n let unpackedA = unpack3NFloats(a.w);\n let unpackedB = unpack3NFloats(b.w);\n let w_out = mix(unpackedA, unpackedB, c);\n\n return TexLerpUnpackResult(mix(a.xyz, b.xyz, c), w_out);\n}\n\nconst HASHSCALE4: vec4f = vec4f(1031.0, 0.1030, 0.0973, 0.1099);\nfn hash41(p: f32) -> vec4f {\n var p4 = fract(vec4f(p) * HASHSCALE4);\n p4 = p4 + dot(p4, p4.wzxy + 19.19);\n return fract(vec4f((p4.x + p4.y)*p4.z, (p4.x + p4.z)*p4.y, (p4.y + p4.z)*p4.w, (p4.z + p4.w)*p4.x));\n}\n\n@fragment\nfn fragmentMain(input : FragmentInput) -> FragmentOutput {\n var output: FragmentOutput;\n\n if (pcPosition.x > uniform.numParticles) {\n discard;\n return output;\n }\n\n readInput(input.vUv0.x);\n visMode = select(-1.0, 1.0, inShow);\n\n let rndFactor = hash41(pcPosition.x + uniform.seed);\n\n let particleRate = uniform.rate + uniform.rateDiv * rndFactor.x;\n\n outLife = inLife + uniform.delta;\n let nlife = clamp(outLife / uniform.lifetime, 0.0, 1.0);\n\n let lerpResult0 = tex1Dlod_lerp(internalTex0, internalTex0Sampler, vec2f(nlife, 0.0));\n var localVelocity = lerpResult0.result;\n let localVelocityDiv = lerpResult0.unpacked;\n\n let lerpResult1 = tex1Dlod_lerp(internalTex1, internalTex1Sampler, vec2f(nlife, 0.0));\n var velocity = lerpResult1.result;\n let velocityDiv = lerpResult1.unpacked;\n\n let lerpResult2 = tex1Dlod_lerp(internalTex2, internalTex2Sampler, vec2f(nlife, 0.0));\n let params = lerpResult2.result;\n let paramDiv = lerpResult2.unpacked;\n var rotSpeed = params.x;\n let rotSpeedDiv = paramDiv.y;\n\n let lerpResult3 = tex1Dlod_lerp(internalTex3, internalTex3Sampler, vec2f(nlife, 0.0));\n let radialParams = lerpResult3.result;\n let radialParamDiv = lerpResult3.unpacked;\n let radialSpeed = radialParams.x;\n let radialSpeedDiv = radialParamDiv.y;\n\n let respawn = inLife <= 0.0 || outLife >= uniform.lifetime;\n inPos = select(inPos, calcSpawnPosition(rndFactor.xyz, rndFactor.x), respawn);\n inAngle = select(inAngle, mix(uniform.startAngle, uniform.startAngle2, rndFactor.x), respawn);\n\n #ifndef LOCAL_SPACE\n var radialVel: vec3f = inPos - uniform.emitterPos;\n #else\n var radialVel: vec3f = inPos;\n #endif\n radialVel = select(vec3f(0.0), radialSpeed * normalize(radialVel), dot(radialVel, radialVel) > 1.0E-8);\n radialVel = radialVel + (radialSpeedDiv * vec3f(2.0) - vec3f(1.0)) * uniform.radialSpeedDivMult * rndFactor.xyz;\n\n localVelocity = localVelocity + (localVelocityDiv * vec3f(2.0) - vec3f(1.0)) * uniform.localVelocityDivMult * rndFactor.xyz;\n velocity = velocity + (velocityDiv * vec3f(2.0) - vec3f(1.0)) * uniform.velocityDivMult * rndFactor.xyz;\n rotSpeed = rotSpeed + (rotSpeedDiv * 2.0 - 1.0) * uniform.rotSpeedDivMult * rndFactor.y;\n\n addInitialVelocity(&localVelocity, rndFactor.xyz);\n\n #ifndef LOCAL_SPACE\n outVel = uniform.emitterMatrix * localVelocity + (radialVel + velocity) * uniform.emitterScale;\n #else\n outVel = (localVelocity + radialVel) / uniform.emitterScale + uniform.emitterMatrixInv * velocity;\n #endif\n\n outPos = inPos + outVel * uniform.delta;\n outAngle = inAngle + rotSpeed * uniform.delta;\n"; export default _default;