194 lines
7.0 KiB
GLSL
194 lines
7.0 KiB
GLSL
// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
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#define USE_GBUFFER_CUSTOM_DATA
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#include "./Flax/Common.hlsl"
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#include "./Flax/GBuffer.hlsl"
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#include "./Flax/MaterialCommon.hlsl"
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#include "./Flax/ShadowsSampling.hlsl"
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META_CB_BEGIN(0, PerLight)
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GBufferData GBuffer;
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LightData Light;
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LightShadowData LightShadow;
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float4x4 WVP;
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float4x4 ViewProjectionMatrix;
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float2 Dummy0;
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float ContactShadowsDistance;
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float ContactShadowsLength;
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META_CB_END
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DECLARE_GBUFFERDATA_ACCESS(GBuffer)
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DECLARE_LIGHTSHADOWDATA_ACCESS(LightShadow);
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#if CONTACT_SHADOWS
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float RayCastScreenSpaceShadow(GBufferData gBufferData, GBufferSample gBuffer, float3 rayStartWS, float3 rayDirWS, float rayLength)
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{
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#if SHADOWS_QUALITY == 3
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const uint maxSteps = 16;
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#elif SHADOWS_QUALITY == 3
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const uint maxSteps = 12;
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#else
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const uint maxSteps = 8;
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#endif
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float distanceFade = 1 - saturate(pow(length(gBuffer.WorldPos - gBufferData.ViewPos) / ContactShadowsDistance, 2));
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float maxShadowLength = gBufferData.InvProjectionMatrix[1][1] * gBuffer.ViewPos.z * rayLength * distanceFade;
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float4 rayStartCS = mul(float4(rayStartWS, 1), ViewProjectionMatrix);
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float4 rayEndCS = mul(float4(rayStartWS + rayDirWS * maxShadowLength, 1), ViewProjectionMatrix);
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float4 rayStepCS = (rayEndCS - rayStartCS) / maxSteps;
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float4 rayCS = rayStartCS + rayStepCS;
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float lightAmountMax = 0;
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for (uint step = 0; step < maxSteps; step++)
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{
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float3 rayUV = rayCS.xyz / rayCS.w;
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rayUV.xy = rayUV.xy * float2(0.5, -0.5) + float2(0.5, 0.5);
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float sceneDepth = SampleDepth(gBufferData, rayUV.xy) * gBufferData.ViewFar;
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float rayDepth = (gBufferData.ViewInfo.w / (rayUV.z - gBufferData.ViewInfo.z)) * gBufferData.ViewFar * 0.998;
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float surfaceThickness = 0.035f + rayDepth * rayLength;
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float depthTestHardness = 0.005f;
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float lightAmount = saturate((rayDepth - sceneDepth) / depthTestHardness) * saturate((sceneDepth + surfaceThickness - rayDepth) / depthTestHardness);
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lightAmountMax = max(lightAmountMax, lightAmount);
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rayCS += rayStepCS;
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}
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return 1 - lightAmountMax;
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}
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#endif
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// Vertex Shader for shadow volume model rendering
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META_VS(true, FEATURE_LEVEL_ES2)
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META_VS_IN_ELEMENT(POSITION, 0, R32G32B32_FLOAT, 0, 0, PER_VERTEX, 0, true)
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Model_VS2PS VS_Model(ModelInput_PosOnly input)
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{
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Model_VS2PS output;
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output.Position = mul(float4(input.Position.xyz, 1), WVP);
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output.ScreenPos = output.Position;
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return output;
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}
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#ifdef _PS_PointLight
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TextureCube<float> ShadowMapPoint : register(t5);
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// Pixel shader for point light shadow rendering
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META_PS(true, FEATURE_LEVEL_ES2)
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META_PERMUTATION_2(SHADOWS_QUALITY=0,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=1,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=2,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=3,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=0,CONTACT_SHADOWS=1)
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META_PERMUTATION_2(SHADOWS_QUALITY=1,CONTACT_SHADOWS=1)
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META_PERMUTATION_2(SHADOWS_QUALITY=2,CONTACT_SHADOWS=1)
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META_PERMUTATION_2(SHADOWS_QUALITY=3,CONTACT_SHADOWS=1)
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float4 PS_PointLight(Model_VS2PS input) : SV_Target0
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{
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float shadow = 1;
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float subsurfaceShadow = 1;
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// Obtain texture coordinates corresponding to the current pixel
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float2 uv = (input.ScreenPos.xy / input.ScreenPos.w) * float2(0.5, -0.5) + float2(0.5, 0.5);
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// Sample GBuffer
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GBufferData gBufferData = GetGBufferData();
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GBufferSample gBuffer = SampleGBuffer(gBufferData, uv);
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// Sample shadow
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LightShadowData lightShadowData = GetLightShadowData();
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shadow = SampleShadow(Light, lightShadowData, ShadowMapPoint, gBuffer, subsurfaceShadow);
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#if CONTACT_SHADOWS
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// Calculate screen-space contact shadow
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shadow *= RayCastScreenSpaceShadow(gBufferData, gBuffer, gBuffer.WorldPos, normalize(Light.Position - gBuffer.WorldPos), ContactShadowsLength);
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#endif
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return float4(shadow, subsurfaceShadow, 1, 1);
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}
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#endif
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#ifdef _PS_DirLight
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Texture2DArray ShadowMapDir : register(t5);
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// Pixel shader for directional light shadow rendering
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META_PS(true, FEATURE_LEVEL_ES2)
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META_PERMUTATION_3(SHADOWS_QUALITY=0,CSM_BLENDING=0,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=1,CSM_BLENDING=0,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=2,CSM_BLENDING=0,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=3,CSM_BLENDING=0,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=0,CSM_BLENDING=1,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=1,CSM_BLENDING=1,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=2,CSM_BLENDING=1,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=3,CSM_BLENDING=1,CONTACT_SHADOWS=0)
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META_PERMUTATION_3(SHADOWS_QUALITY=0,CSM_BLENDING=0,CONTACT_SHADOWS=1)
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META_PERMUTATION_3(SHADOWS_QUALITY=1,CSM_BLENDING=0,CONTACT_SHADOWS=1)
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META_PERMUTATION_3(SHADOWS_QUALITY=2,CSM_BLENDING=0,CONTACT_SHADOWS=1)
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META_PERMUTATION_3(SHADOWS_QUALITY=3,CSM_BLENDING=0,CONTACT_SHADOWS=1)
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META_PERMUTATION_3(SHADOWS_QUALITY=0,CSM_BLENDING=1,CONTACT_SHADOWS=1)
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META_PERMUTATION_3(SHADOWS_QUALITY=1,CSM_BLENDING=1,CONTACT_SHADOWS=1)
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META_PERMUTATION_3(SHADOWS_QUALITY=2,CSM_BLENDING=1,CONTACT_SHADOWS=1)
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META_PERMUTATION_3(SHADOWS_QUALITY=3,CSM_BLENDING=1,CONTACT_SHADOWS=1)
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float4 PS_DirLight(Quad_VS2PS input) : SV_Target0
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{
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float shadow = 1;
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float subsurfaceShadow = 1;
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// Sample GBuffer
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GBufferData gBufferData = GetGBufferData();
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GBufferSample gBuffer = SampleGBuffer(gBufferData, input.TexCoord);
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// Sample shadow
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LightShadowData lightShadowData = GetLightShadowData();
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shadow = SampleShadow(Light, lightShadowData, ShadowMapDir, gBuffer, subsurfaceShadow);
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#if CONTACT_SHADOWS
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// Calculate screen-space contact shadow
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shadow *= RayCastScreenSpaceShadow(gBufferData, gBuffer, gBuffer.WorldPos, Light.Direction, ContactShadowsLength);
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#endif
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return float4(shadow, subsurfaceShadow, 1, 1);
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}
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#endif
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#ifdef _PS_SpotLight
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Texture2D ShadowMapSpot : register(t5);
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// Pixel shader for spot light shadow rendering
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META_PS(true, FEATURE_LEVEL_ES2)
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META_PERMUTATION_2(SHADOWS_QUALITY=0,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=1,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=2,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=3,CONTACT_SHADOWS=0)
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META_PERMUTATION_2(SHADOWS_QUALITY=0,CONTACT_SHADOWS=1)
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META_PERMUTATION_2(SHADOWS_QUALITY=1,CONTACT_SHADOWS=1)
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META_PERMUTATION_2(SHADOWS_QUALITY=2,CONTACT_SHADOWS=1)
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META_PERMUTATION_2(SHADOWS_QUALITY=3,CONTACT_SHADOWS=1)
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float4 PS_SpotLight(Model_VS2PS input) : SV_Target0
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{
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float shadow = 1;
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float subsurfaceShadow = 1;
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// Obtain texture coordinates corresponding to the current pixel
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float2 uv = (input.ScreenPos.xy / input.ScreenPos.w) * float2(0.5, -0.5) + float2(0.5, 0.5);
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// Sample GBuffer
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GBufferData gBufferData = GetGBufferData();
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GBufferSample gBuffer = SampleGBuffer(gBufferData, uv);
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// Sample shadow
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LightShadowData lightShadowData = GetLightShadowData();
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shadow = SampleShadow(Light, lightShadowData, ShadowMapSpot, gBuffer, subsurfaceShadow);
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#if CONTACT_SHADOWS
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// Calculate screen-space contact shadow
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shadow *= RayCastScreenSpaceShadow(gBufferData, gBuffer, gBuffer.WorldPos, normalize(Light.Position - gBuffer.WorldPos), ContactShadowsLength);
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#endif
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return float4(shadow, subsurfaceShadow, 1, 1);
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}
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#endif
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