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using System; |
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using System.Collections.Generic; |
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using System.Diagnostics; |
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using System.Text; |
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using UnityEngine.Experimental.GlobalIllumination; |
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using UnityEngine.Rendering; |
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using UnityEngine.Rendering.PostProcessing; |
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public int pixelAdditionalLightsCount; |
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public int totalAdditionalLightsCount; |
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public int mainLightIndex; |
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public bool shadowsRendered; |
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public LightShadows shadowMapSampleType; |
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} |
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public enum MixedLightingSetup |
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// There's no way to map shadow light indices. We need to pass in the original unsorted index.
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// If no additional lights then no light sorting is performed and the indices match.
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int shadowOriginalIndex = (lightData.totalAdditionalLightsCount > 0) ? GetLightUnsortedIndex(lightData.mainLightIndex) : lightData.mainLightIndex; |
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lightData.shadowsRendered = RenderShadows(ref m_CullResults, ref mainLight, |
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bool shadowsRendered = RenderShadows(ref m_CullResults, ref mainLight, |
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if (shadowsRendered) |
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{ |
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lightData.shadowMapSampleType = (m_Asset.ShadowSetting != ShadowType.SOFT_SHADOWS) |
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? LightShadows.Hard |
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: mainLight.light.shadows; |
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} |
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else |
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{ |
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lightData.shadowMapSampleType = LightShadows.None; |
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} |
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} |
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} |
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} |
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int visibleLightsCount = Math.Min(visibleLights.Length, m_Asset.MaxPixelLights); |
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m_SortedLightIndexMap.Clear(); |
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lightData.shadowsRendered = false; |
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lightData.shadowMapSampleType = LightShadows.None; |
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if (visibleLightsCount <= 1) |
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lightData.mainLightIndex = GetMainLight(visibleLights); |
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if (currLight.light == null) |
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break; |
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// Shadow lights are sorted by type (directional > puctual) and intensity
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// The first shadow light we find in the list is the main light
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// In case no shadow light is present we will return the brightest directional light
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if (currLight.lightType == LightType.Directional && brighestDirectionalIndex == -1) |
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brighestDirectionalIndex = i; |
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} |
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// Main light has an optimized shader path for main light. This will benefit games that only care about a single light.
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// Lightweight pipeline also supports only a single shadow light, if available it will be the main light.
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SetupMainLightConstants(cmd, lights, lightData.mainLightIndex); |
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if (lightData.shadowsRendered) |
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if (lightData.shadowMapSampleType != LightShadows.None) |
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SetupShadowShaderConstants(cmd, ref lights[lightData.mainLightIndex], m_ShadowCasterCascadesCount); |
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if (lightData.totalAdditionalLightsCount > 0) |
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private void SetShaderKeywords(CommandBuffer cmd, ref LightData lightData, VisibleLight[] visibleLights) |
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{ |
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int vertexLightsCount = lightData.totalAdditionalLightsCount - lightData.pixelAdditionalLightsCount; |
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CoreUtils.SetKeyword(cmd, "_VERTEX_LIGHTS", vertexLightsCount > 0); |
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int mainLightIndex = lightData.mainLightIndex; |
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int mainLightIndex = lightData.mainLightIndex; |
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// We have no good approach exposed to skip shader variants, e.g, ideally we would like to skip _CASCADE for all puctual lights
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// We combine light and shadow classification keywords to reduce the amount of shader variants.
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// Lightweight shader library declares defines based on these keywords to make avoid having to check them in the shaders
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// Core.hlsl defines _MAIN_LIGHT_DIRECTIONAL and _MAIN_LIGHT_SPOT (point lights can't be main light)
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// Shadow.hlsl defines _SHADOWS_ENABLED, _SHADOWS_SOFT, _SHADOWS_CASCADE, _SHADOWS_PERSPECTIVE
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string[] mainLightKeywords = |
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{ |
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"_MAIN_LIGHT_DIRECTIONAL_SHADOW", |
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"_MAIN_LIGHT_DIRECTIONAL_SHADOW_CASCADE", |
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"_MAIN_LIGHT_DIRECTIONAL_SHADOW_SOFT", |
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"_MAIN_LIGHT_DIRECTIONAL_SHADOW_CASCADE_SOFT", |
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CoreUtils.SetKeyword(cmd, "_MAIN_LIGHT_COOKIE", mainLightIndex != -1 && LightweightUtils.IsSupportedCookieType(visibleLights[mainLightIndex].lightType) && visibleLights[mainLightIndex].light.cookie != null); |
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CoreUtils.SetKeyword(cmd, "_MAIN_DIRECTIONAL_LIGHT", mainLightIndex == -1 || visibleLights[mainLightIndex].lightType == LightType.Directional); |
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CoreUtils.SetKeyword(cmd, "_MAIN_SPOT_LIGHT", mainLightIndex != -1 && visibleLights[mainLightIndex].lightType == LightType.Spot); |
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CoreUtils.SetKeyword(cmd, "_ADDITIONAL_LIGHTS", lightData.totalAdditionalLightsCount > 0); |
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CoreUtils.SetKeyword(cmd, "_MIXED_LIGHTING_SHADOWMASK", m_MixedLightingSetup == MixedLightingSetup.ShadowMask); |
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CoreUtils.SetKeyword(cmd, "_MIXED_LIGHTING_SUBTRACTIVE", m_MixedLightingSetup == MixedLightingSetup.Subtractive); |
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"_MAIN_LIGHT_SPOT_SHADOW", |
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"_MAIN_LIGHT_SPOT_SHADOW_SOFT" |
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}; |
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string[] shadowKeywords = new string[] { "_HARD_SHADOWS", "_SOFT_SHADOWS", "_HARD_SHADOWS_CASCADES", "_SOFT_SHADOWS_CASCADES" }; |
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for (int i = 0; i < shadowKeywords.Length; ++i) |
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cmd.DisableShaderKeyword(shadowKeywords[i]); |
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for (int i = 0; i < mainLightKeywords.Length; ++i) |
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cmd.DisableShaderKeyword(mainLightKeywords[i]); |
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if (m_Asset.AreShadowsEnabled() && lightData.shadowsRendered) |
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if (mainLightIndex != -1 && (lightData.shadowMapSampleType != LightShadows.None)) |
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int keywordIndex = (int)m_Asset.ShadowSetting - 1; |
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if (m_Asset.CascadeCount > 1) |
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keywordIndex += 2; |
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cmd.EnableShaderKeyword(shadowKeywords[keywordIndex]); |
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StringBuilder keywordString = new StringBuilder("_MAIN_LIGHT"); |
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LightType mainLightType = visibleLights[mainLightIndex].lightType; |
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if (mainLightType == LightType.Directional) |
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{ |
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keywordString.Append("_DIRECTIONAL_SHADOW"); |
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if (m_Asset.CascadeCount > 1) |
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keywordString.Append("_CASCADE"); |
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} |
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else |
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{ |
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keywordString.Append("_SPOT_SHADOW"); |
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} |
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if (lightData.shadowMapSampleType == LightShadows.Soft) |
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keywordString.Append("_SOFT"); |
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string keyword = keywordString.ToString(); |
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cmd.EnableShaderKeyword(keyword); |
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CoreUtils.SetKeyword(cmd, "_MAIN_LIGHT_COOKIE", mainLightIndex != -1 && LightweightUtils.IsSupportedCookieType(visibleLights[mainLightIndex].lightType) && visibleLights[mainLightIndex].light.cookie != null); |
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CoreUtils.SetKeyword(cmd, "_ADDITIONAL_LIGHTS", lightData.totalAdditionalLightsCount > 0); |
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CoreUtils.SetKeyword(cmd, "_MIXED_LIGHTING_SUBTRACTIVE", m_MixedLightingSetup == MixedLightingSetup.Subtractive); |
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CoreUtils.SetKeyword(cmd, "_VERTEX_LIGHTS", vertexLightsCount > 0); |
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CoreUtils.SetKeyword(cmd, "SOFTPARTICLES_ON", m_Asset.RequireCameraDepthTexture); |
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} |
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Felipe Lira
7 年前