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109 行
4.6 KiB
109 行
4.6 KiB
#ifndef WATER_LIGHTING_INCLUDED
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#define WATER_LIGHTING_INCLUDED
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
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#define SHADOW_ITERATIONS 4
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half CalculateFresnelTerm(half3 normalWS, half3 viewDirectionWS)
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{
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return saturate(pow(1.0 - dot(normalWS, viewDirectionWS), 5));//fresnel TODO - find a better place
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}
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///////////////////////////////////////////////////////////////////////////////
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// Lighting Calculations //
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///////////////////////////////////////////////////////////////////////////////
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//diffuse
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half4 VertexLightingAndFog(half3 normalWS, half3 posWS, half3 clipPos)
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{
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half3 vertexLight = VertexLighting(posWS, normalWS);
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half fogFactor = ComputeFogFactor(clipPos.z);
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return half4(fogFactor, vertexLight);
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}
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//specular
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half3 Highlights(half3 positionWS, half roughness, half3 normalWS, half3 viewDirectionWS)
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{
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Light mainLight = GetMainLight();
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half roughness2 = roughness * roughness;
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half3 halfDir = SafeNormalize(mainLight.direction + viewDirectionWS);
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half NoH = saturate(dot(normalize(normalWS), halfDir));
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half LoH = saturate(dot(mainLight.direction, halfDir));
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// GGX Distribution multiplied by combined approximation of Visibility and Fresnel
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// See "Optimizing PBR for Mobile" from Siggraph 2015 moving mobile graphics course
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// https://community.arm.com/events/1155
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half d = NoH * NoH * (roughness2 - 1.h) + 1.0001h;
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half LoH2 = LoH * LoH;
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half specularTerm = roughness2 / ((d * d) * max(0.1h, LoH2) * (roughness + 0.5h) * 4);
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// on mobiles (where half actually means something) denominator have risk of overflow
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// clamp below was added specifically to "fix" that, but dx compiler (we convert bytecode to metal/gles)
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// sees that specularTerm have only non-negative terms, so it skips max(0,..) in clamp (leaving only min(100,...))
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#if defined (SHADER_API_MOBILE)
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specularTerm = specularTerm - HALF_MIN;
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specularTerm = clamp(specularTerm, 0.0, 5.0); // Prevent FP16 overflow on mobiles
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#endif
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return specularTerm * mainLight.color * mainLight.distanceAttenuation;
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}
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//Soft Shadows
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half SoftShadows(float3 screenUV, float3 positionWS, half3 viewDir, half depth)
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{
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#if _MAIN_LIGHT_SHADOWS
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half2 jitterUV = screenUV.xy * _ScreenParams.xy * _DitherPattern_TexelSize.xy;
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half shadowAttenuation = 0;
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float loopDiv = 1.0 / SHADOW_ITERATIONS;
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half depthFrac = depth * loopDiv;
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half3 lightOffset = -viewDir * depthFrac;
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for (uint i = 0u; i < SHADOW_ITERATIONS; ++i)
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{
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#ifndef _STATIC_SHADER
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jitterUV += frac(half2(_Time.x, -_Time.z));
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#endif
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float3 jitterTexture = SAMPLE_TEXTURE2D(_DitherPattern, sampler_DitherPattern, jitterUV + i * _ScreenParams.xy).xyz * 2 - 1;
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half3 j = jitterTexture.xzy * depthFrac * i * 0.1;
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float3 lightJitter = (positionWS + j) + (lightOffset * (i + jitterTexture.y));
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shadowAttenuation += SAMPLE_TEXTURE2D_SHADOW(_MainLightShadowmapTexture, sampler_MainLightShadowmapTexture, TransformWorldToShadowCoord(lightJitter));
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}
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return BEYOND_SHADOW_FAR(TransformWorldToShadowCoord(positionWS * 1.1)) ? 1.0 : shadowAttenuation * loopDiv;
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#else
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return 1;
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#endif
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}
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///////////////////////////////////////////////////////////////////////////////
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// Reflection Modes //
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///////////////////////////////////////////////////////////////////////////////
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half3 SampleReflections(half3 normalWS, half3 viewDirectionWS, half2 screenUV, half roughness)
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{
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half3 reflection = 0;
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half2 refOffset = 0;
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#if _REFLECTION_CUBEMAP
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half3 reflectVector = reflect(-viewDirectionWS, normalWS);
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reflection = SAMPLE_TEXTURECUBE(_CubemapTexture, sampler_CubemapTexture, reflectVector).rgb;
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#elif _REFLECTION_PROBES
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half3 reflectVector = reflect(-viewDirectionWS, normalWS);
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reflection = GlossyEnvironmentReflection(reflectVector, 0, 1);
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#elif _REFLECTION_PLANARREFLECTION
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// get the perspective projection
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float2 p11_22 = float2(unity_CameraInvProjection._11, unity_CameraInvProjection._22) * 10;
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// conver the uvs into view space by "undoing" projection
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float3 viewDir = -(float3((screenUV * 2 - 1) / p11_22, -1));
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half3 viewNormal = mul(normalWS, (float3x3)GetWorldToViewMatrix()).xyz;
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half3 reflectVector = reflect(-viewDir, viewNormal);
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half2 reflectionUV = screenUV + normalWS.zx * half2(0.02, 0.15);
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reflection += SAMPLE_TEXTURE2D_LOD(_PlanarReflectionTexture, sampler_ScreenTextures_linear_clamp, reflectionUV, 6 * roughness).rgb;//planar reflection
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#endif
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//do backup
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//return reflectVector.yyy;
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return reflection;
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}
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#endif // WATER_LIGHTING_INCLUDED
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