299 lines
13 KiB
GLSL
299 lines
13 KiB
GLSL
Shader "Lux URP/Projection/Decal Unlit"
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{
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Properties
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{
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[HeaderHelpLuxURP_URL(skzrp97i0tvt)]
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[Header(Surface Options)]
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[Space(5)]
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[Toggle(ORTHO_SUPPORT)]
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_OrthoSpport ("Enable Orthographic Support", Float) = 0
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[Toggle(HQ_SAMPLING)]
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_HQSampling ("Enable HQ Sampling", Float) = 0
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[Header(Surface Inputs)]
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[Space(5)]
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[HDR] _Color ("Color", Color) = (1,1,1,1)
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[NoScaleOffset] _BaseMap ("Albedo (RGB) Alpha (A)", 2D) = "white" {}
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[Header(Distance Fading)]
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[Space(5)]
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[LuxURPDistanceFadeDrawer]
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_DistanceFade ("Distance Fade Params", Vector) = (2500, 0.001, 0, 0)
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[Header(Stencil)]
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[Space(5)]
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[IntRange] _StencilRef ("Stencil Reference", Range (0, 255)) = 0
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[IntRange] _ReadMask (" Read Mask", Range (0, 255)) = 255
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[IntRange] _WriteMask (" Write Mask", Range (0, 255)) = 255
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[Enum(UnityEngine.Rendering.CompareFunction)]
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_StencilCompare ("Stencil Comparison", Int) = 6
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[Header(Advanced)]
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[Space(5)]
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[Toggle(_APPLYFOG)] _ApplyFog("Enable Fog", Float) = 0.0
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}
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SubShader
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{
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Tags
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{
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"RenderPipeline" = "UniversalPipeline"
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"RenderType" = "Opaque"
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"Queue" = "Transparent" // +59 smalltest to get drawn on top of transparents
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}
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Pass
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{
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Name "StandardUnlit"
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Tags{"LightMode" = "UniversalForward"}
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Stencil {
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Ref [_StencilRef]
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ReadMask [_ReadMask]
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WriteMask [_WriteMask]
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Comp [_StencilCompare]
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}
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Blend SrcAlpha OneMinusSrcAlpha
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// We draw backfaces to prevent clipping
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Cull Front
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// So we have to set ZTest to always
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ZTest Always
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// It is a decal!
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ZWrite Off
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HLSLPROGRAM
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// Required to compile gles 2.0 with standard srp library
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#pragma prefer_hlslcc gles
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#pragma exclude_renderers d3d11_9x
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#pragma target 2.0
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#pragma shader_feature_local ORTHO_SUPPORT
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#pragma shader_feature_local HQ_SAMPLING
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#pragma shader_feature_local _APPLYFOG
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// -------------------------------------
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// Lightweight Pipeline keywords
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// -------------------------------------
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// Unity defined keywords
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#pragma multi_compile_fog
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//--------------------------------------
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// GPU Instancing
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#pragma multi_compile_instancing
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#pragma vertex vert
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#pragma fragment frag
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// Lighting include is needed because of GI
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/Shaders/UnlitInput.hlsl"
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CBUFFER_START(UnityPerMaterial)
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half4 _Color;
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float2 _DistanceFade;
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CBUFFER_END
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#if defined(SHADER_API_GLES)
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TEXTURE2D(_CameraDepthTexture); SAMPLER(sampler_CameraDepthTexture);
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#else
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TEXTURE2D_X_FLOAT(_CameraDepthTexture);
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#endif
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float4 _CameraDepthTexture_TexelSize;
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//TEXTURE2D(_BaseMap); SAMPLER(sampler_BaseMap);
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float4 _BaseMap_TexelSize;
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struct VertexInput
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{
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float4 vertex : POSITION;
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float3 normal : NORMAL;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct VertexOutput
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{
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float4 positionCS : SV_POSITION;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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UNITY_VERTEX_OUTPUT_STEREO
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float4 viewRayOS : TEXCOORD0;
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float3 camPosOS : TEXCOORD1;
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float4 screenUV : TEXCOORD2;
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#if defined(_APPLYFOG)
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float fogCoord : TEXCOORD3;
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#endif
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half fade : TEXCOORD4;
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};
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VertexOutput vert (VertexInput v)
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{
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VertexOutput output = (VertexOutput)0;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_TRANSFER_INSTANCE_ID(v, output);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);
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output.positionCS = TransformObjectToHClip(v.vertex.xyz);
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// We do all calculations in Object Space
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float4 positionVS = mul(UNITY_MATRIX_MV, v.vertex);
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float3 viewRayVS = positionVS.xyz;
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// positionVS.z here acts as view space to object space ratio (negative)
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output.viewRayOS.w = positionVS.z;
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// NOTE: Fix direction of the viewRay
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float4x4 ViewToObjectMatrix = mul(GetWorldToObjectMatrix(), UNITY_MATRIX_I_V);
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output.viewRayOS.xyz = mul((float3x3)ViewToObjectMatrix, -viewRayVS).xyz;
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output.camPosOS = ViewToObjectMatrix._m03_m13_m23;
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// Get the screen uvs needed to sample the depth texture
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output.screenUV = ComputeScreenPos(output.positionCS);
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#if defined(_APPLYFOG)
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output.fogCoord = ComputeFogFactor(output.positionCS.z);
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#endif
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// Set distance fade value
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float3 worldInstancePos = UNITY_MATRIX_M._m03_m13_m23;
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float3 diff = (_WorldSpaceCameraPos - worldInstancePos);
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float dist = dot(diff, diff);
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output.fade = saturate( (_DistanceFade.x - dist) * _DistanceFade.y );
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return output;
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}
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// HQ decal sampling from: http://www.humus.name/index.php?page=3D&ID=84
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// Decal MipmapLevel to avoid the 2x2 pixels artefacts on the edges where the decal is projected to.
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float2 ComputeDecalDDX(VertexOutput input, float2 uv, float2 decalUV) {
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float2 ScreenDeltaX = float2(1, 0);
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float depth0 = LOAD_TEXTURE2D_X(_CameraDepthTexture, _CameraDepthTexture_TexelSize.zw * uv - ScreenDeltaX).x;
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depth0 = LinearEyeDepth(depth0, _ZBufferParams);
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float depth1 = LOAD_TEXTURE2D_X(_CameraDepthTexture, _CameraDepthTexture_TexelSize.zw * uv + ScreenDeltaX).x;
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depth1 = LinearEyeDepth(depth1, _ZBufferParams);
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float2 UvDiffX0 = decalUV - ((input.camPosOS + input.viewRayOS.xyz * depth0).xz + float2(0.5, 0.5));
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float2 UvDiffX1 = ((input.camPosOS + input.viewRayOS.xyz * depth1).xz + float2(0.5, 0.5)) - decalUV;
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return dot(UvDiffX0, UvDiffX0) < dot(UvDiffX1, UvDiffX1) ? UvDiffX0 : UvDiffX1;
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}
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float2 ComputeDecalDDY(VertexOutput input, float2 uv, float2 decalUV) {
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float2 ScreenDeltaY = float2(0, 1);
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float depth0 = LOAD_TEXTURE2D_X(_CameraDepthTexture, _CameraDepthTexture_TexelSize.zw * uv - ScreenDeltaY).x;
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depth0 = LinearEyeDepth(depth0, _ZBufferParams);
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float depth1 = LOAD_TEXTURE2D_X(_CameraDepthTexture, _CameraDepthTexture_TexelSize.zw * uv + ScreenDeltaY).x;
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depth1 = LinearEyeDepth(depth1, _ZBufferParams);
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float2 UvDiffY0 = decalUV - ((input.camPosOS + input.viewRayOS.xyz * depth0).xz + float2(0.5, 0.5));
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float2 UvDiffY1 = ((input.camPosOS + input.viewRayOS.xyz * depth1).xz + float2(0.5, 0.5)) - decalUV;
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return dot(UvDiffY0, UvDiffY0) < dot(UvDiffY1, UvDiffY1) ? UvDiffY0 : UvDiffY1;
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}
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// HQ decal sampling END
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half4 frag (VertexOutput input ) : SV_Target
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{
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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input.viewRayOS.xyz *= rcp(input.viewRayOS.w); // precision problem? calculating 1.0 / w in vertex shader.
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float2 uv = input.screenUV.xy / input.screenUV.w;
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// Fix screenUV for Single Pass Stereo Rendering
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#if defined(UNITY_SINGLE_PASS_STEREO)
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uv.x = uv.x * 0.5f + (float)unity_StereoEyeIndex * 0.5f;
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#endif
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#if defined(SHADER_API_GLES)
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float rawDepth = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, sampler_CameraDepthTexture, uv, 0);
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#else
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float rawDepth = LOAD_TEXTURE2D_X(_CameraDepthTexture, _CameraDepthTexture_TexelSize.zw * uv).x;
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#endif
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float3 positionOS;
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// Get Position in Object Space
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#if defined(ORTHO_SUPPORT)
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UNITY_BRANCH
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if(unity_OrthoParams.w == 1) {
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float depthOrtho = rawDepth;
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#if defined(UNITY_REVERSED_Z)
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// Needed to handle openGL
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#if UNITY_REVERSED_Z == 1
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depthOrtho = 1.0f - depthOrtho;
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#endif
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#endif
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// Get ortho Depth
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// Old code, no idea why this ever worked...
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// depthOrtho = lerp(_ProjectionParams.y, _ProjectionParams.z, depthOrtho);
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// float2 rayOrtho = -float2( unity_OrthoParams.xy * ( input.screenUV.xy - 0.5) * 2 /* to clip space */);
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// float4 vposOrtho = float4(rayOrtho, -depthOrtho, 1);
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// float3 wposOrtho = mul(unity_CameraToWorld, vposOrtho).xyz;
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// wposOrtho -= _WorldSpaceCameraPos * 2; // TODO: Why * 2 ????
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// wposOrtho *= -1;
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// float3 positionOrthoOS = mul( GetWorldToObjectMatrix(), float4(wposOrtho, 1)).xyz;
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depthOrtho = lerp(_ProjectionParams.y, _ProjectionParams.z, depthOrtho);
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float2 rayOrtho = float2( unity_OrthoParams.xy * ( input.screenUV.xy - 0.5) * 2 /* to clip space */);
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float4 vposOrtho = float4(rayOrtho, -depthOrtho, 1);
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float3 wposOrtho = mul(unity_CameraToWorld, vposOrtho).xyz;
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float3 positionOrthoOS = mul( GetWorldToObjectMatrix(), float4(wposOrtho, 1)).xyz;
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positionOS = positionOrthoOS;
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}
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else {
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// Get perspective Depth
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float depth = LinearEyeDepth(rawDepth, _ZBufferParams);
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// Position in Object Space
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positionOS = input.camPosOS + input.viewRayOS.xyz * depth;
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}
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#else
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// Get perspective Depth
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float depth = LinearEyeDepth(rawDepth, _ZBufferParams);
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// Position in Object Space
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positionOS = input.camPosOS + input.viewRayOS.xyz * depth;
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#endif
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// Clip decal to volume
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clip(float3(0.5, 0.5, 0.5) - abs(positionOS.xyz));
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float2 texUV = positionOS.xz + float2(0.5, 0.5);
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// HQ Decal Sampling
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#if defined(HQ_SAMPLING) && !defined(ORTHO_SUPPORT)
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float2 UvPixelDiffX = ComputeDecalDDX(input, uv, texUV) * _BaseMap_TexelSize.zw;
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float2 UvPixelDiffY = ComputeDecalDDY(input, uv, texUV) * _BaseMap_TexelSize.zw;
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float MaxDiff = max(dot(UvPixelDiffX, UvPixelDiffX), dot(UvPixelDiffY, UvPixelDiffY));
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float Mip = 0.5 * log2(MaxDiff);
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half4 col = SAMPLE_TEXTURE2D_LOD(_BaseMap, sampler_BaseMap, texUV, Mip) * _Color;
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#else
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half4 col = SAMPLE_TEXTURE2D(_BaseMap, sampler_BaseMap, texUV) * _Color;
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#endif
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// Distance Fade
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#if defined(ORTHO_SUPPORT)
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col.a *= ((unity_OrthoParams.w == 1.0h) ? 1.0h : input.fade);
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#else
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col.a *= input.fade;
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#endif
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#if defined(_APPLYFOG)
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col.rgb = MixFog(col.rgb, input.fogCoord);
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#endif
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return half4(col);
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}
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ENDHLSL
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}
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}
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FallBack "Hidden/InternalErrorShader"
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CustomEditor "LuxURPUniversalCustomShaderGUI"
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} |