using UnityEngine;
using UnityEngine.Rendering;

namespace BadDog.Rendering.AreaLight
{
    /// <summary>
    /// Shader property IDs for Area Lighting and Shadows
    /// </summary>
    public static class AreaLightingShaderIDs
    {
        // Light Data
        public static readonly int _AreaLightDataBuffer = Shader.PropertyToID("_AreaLightDataBuffer");
        public static readonly int _AreaLightDataBufferCount = Shader.PropertyToID("_AreaLightDataBufferCount");

        // Shadow Data
        public static readonly int _AreaLightsShadowmapTexture = Shader.PropertyToID("_AreaLightsShadowmapTexture");
        public static readonly int _AreaLightsWorldToShadow = Shader.PropertyToID("_AreaLightsWorldToShadow");
        public static readonly int _AreaLightShadowParams = Shader.PropertyToID("_AreaLightShadowParams");
        public static readonly int _AreaLightShadowmapSize = Shader.PropertyToID("_AreaLightShadowmapSize");
        public static readonly int _PCSSAdditionalLightParams = Shader.PropertyToID("_PCSSAdditionalLightParams");

        // Shadow Rendering
        public static readonly int _ShadowBias = Shader.PropertyToID("_ShadowBias");
        public static readonly int _LightPosition = Shader.PropertyToID("_LightPosition");

        // Shader keywords
        public const string ENABLE_BG_AREA_LIGHTING_KEYWORD = "_ENABLE_BG_AREA_LIGHTING";
    }

    /// <summary>
    /// BG Area Light shader global keywords (similar to URP's ShaderGlobalKeywords)
    /// </summary>
    internal static class ShaderGlobalKeywords
    {
        public static readonly GlobalKeyword BGAreaLightShadowsPCF2x2 = GlobalKeyword.Create("_BG_AREALIGHT_SHADOWS_PCF2X2");
        public static readonly GlobalKeyword BGAreaLightShadowsTent5x5 = GlobalKeyword.Create("_BG_AREALIGHT_SHADOWS_TENT5X5");
        public static readonly GlobalKeyword BGAreaLightShadowsTent7x7 = GlobalKeyword.Create("_BG_AREALIGHT_SHADOWS_TENT7X7");
        public static readonly GlobalKeyword BGAreaLightShadowsPCSS = GlobalKeyword.Create("_BG_AREALIGHT_SHADOWS_PCSS");
    }
}