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136 righe
3.8 KiB
136 righe
3.8 KiB
Shader "MyShader/PBRDiffuse2"
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{
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Properties {
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_Color("MainColor", Color) = (0.5,0.5,0.5,1)
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_MainTex ("Base (RGB)", 2D) = "white" {}
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[NoScaleOffset]_NmlMap("Normal Map", 2D) = "bump" {}
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_NormalScale("Normal Scale", Range(0, 3)) = 1
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[NoScaleOffset]_RMmap("Roughness(r)Metallic(g)map", 2D) = "black"{}
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_RoughnessScale("Roughness Scale", Range(0, 1)) = 1
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_MetallicScale("Metallic Scale", Range(0, 1)) = 1
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_LightAdjustMin("light_adjust_min", Range(0, 2)) = 0
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_LightAdjustMax("light_adjust_max", Range(0, 2)) = 1
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}
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CGINCLUDE
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#include "UnityCG.cginc"
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#pragma multi_compile_fwdbase
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#pragma multi_compile_fog
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#pragma fragmentoption ARB_precision_hint_fastest
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sampler2D _MainTex;
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sampler2D _NmlMap;
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sampler2D _RMmap;
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half _NormalScale, _RoughnessScale, _MetallicScale, _LightAdjustMin, _LightAdjustMax;
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half4 _MainTex_ST, _Color;
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half4 _GlobalLightColor;
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half4 _GlobalLightDir;
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inline float BRDFSpec(float noh, float loh, float r4, float r)
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{
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float a = (noh * noh) * (r4 - 1) + 1;
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a *= loh;
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float a2 = a * a;
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return min(32, r4 / (4 * UNITY_PI * a2 * (r + 0.5)));
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}
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ENDCG
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SubShader
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{
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Tags { "RenderType"="Opaque" }
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma target 3.0
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#pragma fragmentoption ARB_precision_hint_fastest
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struct a2v
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{
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float4 vertex : POSITION;
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half3 normal : NORMAL;
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half4 tangent : TANGENT;
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half2 texcoord : TEXCOORD0;
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half2 texcoord1 : TEXCOORD1;
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};
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struct v2f
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{
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float4 pos : SV_POSITION;
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float4 uv : TEXCOORD0;
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float4 posWorld : TEXCOORD1;
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float3 normalDir : TEXCOORD2;
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float3 tangentDir : TEXCOORD3;
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float3 bitangentDir : TEXCOORD4;
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UNITY_FOG_COORDS(5)
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};
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v2f vert(a2v v)
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{
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v2f o;
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o.posWorld = mul(unity_ObjectToWorld, v.vertex);
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o.pos = mul(UNITY_MATRIX_VP, o.posWorld);
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o.uv.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
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o.uv.zw = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
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o.normalDir = normalize(mul((float3x3)unity_WorldToObject, v.normal));
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o.tangentDir = normalize(mul((float3x3)unity_ObjectToWorld, v.tangent.xyz));
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o.bitangentDir = cross(o.normalDir, o.tangentDir) * v.tangent.w;
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UNITY_TRANSFER_FOG(o, o.pos);
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return o;
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}
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half4 frag (v2f i) : SV_Target
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{
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half4 cBase = tex2D(_MainTex, i.uv.xy);
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float3x3 tangentTransform = float3x3(i.tangentDir, i.bitangentDir, i.normalDir);
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half3 normal = UnpackNormal(tex2D(_NmlMap, i.uv.xy));
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normal.xy *= _NormalScale;
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normal = normalize(mul(normal, tangentTransform));
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half4 texRM = tex2D(_RMmap, i.uv.xy);
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half roughness = max(texRM.r, 0.008) * _RoughnessScale;
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half metallic = texRM.g * _MetallicScale;
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half3 L = _GlobalLightDir.xyz;
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half3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz);
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half3 halfDir = normalize(L + viewDir);
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half nl = max(dot(normal, L), 0.001);
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half nh = max(dot(normal, halfDir), 0.01);
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half lh = max(dot(L, halfDir), 0.01);
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half3 cLit = _GlobalLightColor * nl;
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cBase.rgb *= cBase.rgb;
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half3 cDiffuse = (1.0f - metallic) * cBase.rgb;
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half3 SpecularColor = (0.04 - 0.04 * metallic) + cBase.rgb * metallic;
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half4 r4 = roughness * roughness;
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r4 *= r4;
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float3 specularTerm = BRDFSpec(nh, lh, r4, roughness) * SpecularColor;
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half3 lmCol = DecodeLightmap (UNITY_SAMPLE_TEX2D(unity_Lightmap, i.uv.zw)) ;
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half3 finalColor = lmCol.rgb * lmCol.rgb * cDiffuse.rgb;
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cLit *= smoothstep(_LightAdjustMin, _LightAdjustMax, Luminance(lmCol.rgb));
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finalColor += (specularTerm + cDiffuse)* cLit;
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finalColor = sqrt(finalColor);
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finalColor.rgb *= (2.0 * _Color);
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UNITY_APPLY_FOG(i.fogCoord, finalColor);
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return half4(finalColor, 1);
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}
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ENDCG
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}
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}
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}
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