pema99

// Paper: ZH3: Quadratic Zonal Harmonics, i3D 2024. https://torust.me/ZH3.pdf
// Code based on paper and demo https://www.shadertoy.com/view/Xfj3RK

#include "UnityCG.cginc"

// L1 radiance = L1 irradiance * PI / Y_1 / AHat_1
// PI / (sqrt(3 / PI) / 2) / ((2 * PI) / 3) = sqrt(3 * PI)
const static float L0IrradianceToRadiance = 2 * sqrt(UNITY_PI);

// L0 radiance = L0 irradiance * PI / Y_0 / AHat_0

pema99

// SPDX-License-Identifier: MIT
// Author: pema99

// This file contains functions that simulate Quad and Wave Intrinsics without access to either.
// For more information on those, see: https://github.com/Microsoft/DirectXShaderCompiler/wiki/Wave-Intrinsics

// To use the functions, you must call SETUP_QUAD_INTRINSICS(pos) at the start of your fragment shader,
// where 'pos' is the pixel position, ie. the fragment input variable with the SV_Position semantic.
// Note that some functions will require SM 5.0, ie. #pragma target 5.0.