204 lines
6.2 KiB
HLSL
204 lines
6.2 KiB
HLSL
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// 统一处理UnityGI的算法
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#ifndef UNITY_GI_BASE_INCLUDE
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#define UNITY_GI_BASE_INCLUDE
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#include "UnityCG.cginc"
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#include "Lighting.cginc"
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#include "AutoLight.cginc"
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#include "SimLightSpecular.cginc"
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// Forward Base 通用的参数结构
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struct v2f_Base {
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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float4 tSpace0 : TEXCOORD1;
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float4 tSpace1 : TEXCOORD2;
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float4 tSpace2 : TEXCOORD3;
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UNITY_FOG_COORDS(4)
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SHADOW_COORDS(5)
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#ifndef LIGHTMAP_OFF
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float4 lmap : TEXCOORD6;
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#endif
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#if UNITY_SHOULD_SAMPLE_SH
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half3 sh : TEXCOORD7; // SH
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#endif
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};
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// Forward Add 使用的参数结构
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struct v2f_Add {
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float4 pos : SV_POSITION;
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float4 uv : TEXCOORD0;
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float3 lightDir : TEXCOORD1;
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float3 worldPos : TEXCOORD2;
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UNITY_FOG_COORDS(3)
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SHADOW_COORDS(4)
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};
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GLOBAL_LIGHT_INFORMATION
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#if PLAYER_HALO_ON
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uniform float _PlayerLightStrength;
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uniform float4 _PlayerLightPos;
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fixed LightColorFromWorld(float3 pos)
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{
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float lengthSqr = 0;
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float toLightX = pos.x - _PlayerLightPos.x;
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float toLightY = pos.y - _PlayerLightPos.y;
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float toLightZ = pos.z - _PlayerLightPos.z;
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lengthSqr += toLightX * toLightX;
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lengthSqr += toLightY * toLightY;
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lengthSqr += toLightZ * toLightZ;
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return _PlayerLightStrength * 2.0 / (1.0 + lengthSqr);
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}
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#endif
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// 通用ForwardBase的Vertex代码
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v2f_Base vert_Base(appdata_full v)
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{
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v2f_Base o;
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UNITY_INITIALIZE_OUTPUT(v2f_Base, o);
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = v.texcoord;
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float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
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fixed3 worldNormal = UnityObjectToWorldNormal(v.normal);
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fixed3 worldTangent = UnityObjectToWorldDir(v.tangent.xyz);
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fixed tangentSign = v.tangent.w * unity_WorldTransformParams.w;
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fixed3 worldBinormal = cross(worldNormal, worldTangent) * tangentSign;
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o.tSpace0 = float4(worldTangent.x, worldBinormal.x, worldNormal.x, worldPos.x);
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o.tSpace1 = float4(worldTangent.y, worldBinormal.y, worldNormal.y, worldPos.y);
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o.tSpace2 = float4(worldTangent.z, worldBinormal.z, worldNormal.z, worldPos.z);
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TRANSFER_SHADOW(o)
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UNITY_TRANSFER_FOG(o,o.pos);
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#ifndef LIGHTMAP_OFF
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o.lmap.xy = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
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#ifndef DYNAMICLIGHTMAP_OFF
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o.lmap.zw = v.texcoord2.xy * unity_DynamicLightmapST.xy + unity_DynamicLightmapST.zw;
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#endif
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#endif
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#if UNITY_SHOULD_SAMPLE_SH
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o.sh = 0;
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// Approximated illumination from non-important point lights
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#ifdef VERTEXLIGHT_ON
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o.sh += Shade4PointLights (
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unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0,
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unity_LightColor[0].rgb, unity_LightColor[1].rgb, unity_LightColor[2].rgb, unity_LightColor[3].rgb,
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unity_4LightAtten0, worldPos, worldNormal);
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#endif
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o.sh = ShadeSHPerVertex (worldNormal, o.sh);
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#endif
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return o;
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}
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// 通用ForwardAdd的Vertex代码
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v2f_Add vert_Add (appdata_full v) {
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v2f_Add o;
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UNITY_INITIALIZE_OUTPUT(v2f_Add, o);
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = v.texcoord;
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o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
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// 使用真实光源参数，光照贴图将不会走ForwardAdd
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#ifdef USING_DIRECTIONAL_LIGHT
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fixed3 lightDir = _WorldSpaceLightPos0.xyz;
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#else
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fixed3 lightDir = normalize(UnityWorldSpaceLightDir(o.worldPos));
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#endif
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TANGENT_SPACE_ROTATION;
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o.lightDir = normalize(MUL_3x3_WITH_VECTOR(rotation, MUL_3x3_WITH_VECTOR(unity_WorldToObject, lightDir)));
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TRANSFER_SHADOW(o)
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UNITY_TRANSFER_FOG(o, o.pos);
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return o;
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}
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float3 GetWorldPos(v2f_Base i)
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{
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return float3(i.tSpace0.w, i.tSpace1.w, i.tSpace2.w);
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}
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float3 GetLightDir(float3 worldPos)
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{
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#ifndef LIGHTMAP_OFF
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fixed3 lightDir = _DirectionalLight.xyz;
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#else
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#ifndef USING_DIRECTIONAL_LIGHT
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fixed3 lightDir = normalize(UnityWorldSpaceLightDir(worldPos));
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#else
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fixed3 lightDir = _WorldSpaceLightPos0.xyz;
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#endif
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#endif
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return lightDir;
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}
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// 不使用SurfaceOutput的LambertLight，直接使用ndotl执行计算
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inline fixed3 LambertLight (half3 albedo, half ndotl, UnityLight light)
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{
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fixed3 c = albedo * light.color * ndotl;
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return c;
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}
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fixed3 GetUnityGiColorFull(half3 color, v2f_Base i, half3 worldNormal, half3 worldPos, half3 lightDir, float ndotl, float atten)
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{
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// 构造常规函数UnityGI
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UnityGI gi;
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UNITY_INITIALIZE_OUTPUT(UnityGI, gi);
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gi.indirect.diffuse = 0;
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gi.indirect.specular = 0;
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#if !defined(LIGHTMAP_ON)
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gi.light.color = _LightColor0.rgb;
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gi.light.dir = lightDir;
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gi.light.ndotl = ndotl;
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#endif
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// 构造常规函数UnityGIInput
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UnityGIInput giInput;
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UNITY_INITIALIZE_OUTPUT(UnityGIInput, giInput);
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giInput.light = gi.light;
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giInput.worldPos = worldPos;
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giInput.atten = atten;
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#ifndef LIGHTMAP_OFF
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giInput.lightmapUV = i.lmap;
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#else
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giInput.lightmapUV = 0.0;
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#endif
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#if UNITY_SHOULD_SAMPLE_SH
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giInput.ambient = i.sh;
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#else
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giInput.ambient.rgb = 0.0;
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#endif
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giInput.probeHDR[0] = unity_SpecCube0_HDR;
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giInput.probeHDR[1] = unity_SpecCube1_HDR;
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#if UNITY_SPECCUBE_BLENDING || UNITY_SPECCUBE_BOX_PROJECTION
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giInput.boxMin[0] = unity_SpecCube0_BoxMin; // .w holds lerp value for blending
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#endif
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#if UNITY_SPECCUBE_BOX_PROJECTION
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giInput.boxMax[0] = unity_SpecCube0_BoxMax;
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giInput.probePosition[0] = unity_SpecCube0_ProbePosition;
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giInput.boxMax[1] = unity_SpecCube1_BoxMax;
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giInput.boxMin[1] = unity_SpecCube1_BoxMin;
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giInput.probePosition[1] = unity_SpecCube1_ProbePosition;
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#endif
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// 计算最终UnityGI
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gi = UnityGlobalIllumination(giInput, 1.0, worldNormal);
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// 相当于LightingBlinnPhong(o, worldViewDir, gi);
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fixed3 albedo = color;
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color = LambertLight(albedo, ndotl, gi.light);
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// 不会使用分离贴图处理
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#if defined(DIRLIGHTMAP_SEPARATE)
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#ifdef LIGHTMAP_ON
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color += LambertLight (albedo, ndotl, gi.light2);
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#endif
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#ifdef DYNAMICLIGHTMAP_ON
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color += LambertLight (albedo, ndotl, gi.light3);
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#endif
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#endif
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#ifdef UNITY_LIGHT_FUNCTION_APPLY_INDIRECT
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color += albedo * gi.indirect.diffuse;
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#endif
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return color;
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}
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#define GET_UNITY_GI_COLOR \
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half3 worldPos = GetWorldPos(i); \
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half3 lightDir = GetLightDir(worldPos); \
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fixed ndotl = LambertTerm(worldNormal, lightDir); \
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half atten = SHADOW_ATTENUATION(i); \
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fixed3 giColor = GetUnityGiColorFull(c.rgb, i, worldNormal, worldPos, lightDir, ndotl, atten)
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#endif
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