1 files changed, 92 insertions, 0 deletions
diff --git a/Shaders/parallax/pbr.cginc b/Shaders/parallax/pbr.cginc
new file mode 100644
index 0000000..e5548c7
--- /dev/null
+++ b/Shaders/parallax/pbr.cginc
@@ -0,0 +1,92 @@
+#ifndef __PBR_INC
+#define __PBR_INC
+
+#include "UnityPBSLighting.cginc"
+
+// xdd
+UNITY_DECLARE_TEXCUBE(_Cubemap);
+
+struct v2f
+{
+  float4 position : SV_POSITION;
+  float4 uv : TEXCOORD0;
+  float3 normal : TEXCOORD1;
+  float3 worldPos : TEXCOORD2;
+
+  #if defined(VERTEXLIGHT_ON)
+  float3 vertexLightColor : TEXCOORD3;
+  #endif
+};
+
+UnityLight GetLight(v2f i, float3 worldPos, float3 normal)
+{
+  UNITY_LIGHT_ATTENUATION(attenuation, 0, worldPos);
+  float3 light_color = _LightColor0.rgb * attenuation;
+
+  UnityLight light;
+  light.color = light_color;
+  #if defined(POINT) || defined(POINT_COOKIE) || defined(SPOT)
+  light.dir = normalize(_WorldSpaceLightPos0.xyz - worldPos);
+  #else
+  light.dir = _WorldSpaceLightPos0.xyz;
+  #endif
+  light.ndotl = DotClamped(normal, light.dir);
+
+  return light;
+}
+
+UnityIndirect GetIndirect(v2f i, float3 view_dir, float3 normal,
+    float smoothness, bool custom_cubemap) {
+  UnityIndirect indirect;
+  indirect.diffuse = 0;
+  indirect.specular = 0;
+
+  #if defined(VERTEXLIGHT_ON)
+  indirect.diffuse = i.vertexLightColor;
+  #endif
+
+  #if defined(FORWARD_BASE_PASS)
+  indirect.diffuse += max(0, ShadeSH9(float4(normal, 1)));
+  float3 reflect_dir = reflect(-view_dir, normal);
+  // There's a nonlinear relationship between mipmap level and roughness.
+  float roughness = 1 - smoothness;
+  roughness *= 1.7 - .7 * roughness;
+  if (custom_cubemap) {
+    float3 env_sample = UNITY_SAMPLE_TEXCUBE_LOD(
+        _Cubemap,
+        reflect_dir,
+        roughness * UNITY_SPECCUBE_LOD_STEPS);
+    indirect.specular = env_sample;
+  } else {
+    float3 env_sample = UNITY_SAMPLE_TEXCUBE_LOD(
+        unity_SpecCube0,
+        reflect_dir,
+        roughness * UNITY_SPECCUBE_LOD_STEPS);
+    indirect.specular = env_sample;
+  }
+  #endif
+
+  return indirect;
+}
+
+fixed4 getLitColor(v2f i, fixed4 albedo, float3 worldPos, float3 normal,
+    float metallic, float smoothness,
+    bool custom_cubemap)
+{
+  float3 specular_tint;
+  float one_minus_reflectivity;
+  albedo.rgb = DiffuseAndSpecularFromMetallic(
+    albedo, metallic, specular_tint, one_minus_reflectivity);
+
+  float3 view_dir = normalize(_WorldSpaceCameraPos - i.worldPos);
+
+  fixed3 pbr = UNITY_BRDF_PBS(albedo, specular_tint,
+      one_minus_reflectivity, smoothness,
+      view_dir, normal,
+      GetLight(i, worldPos, normal),
+      GetIndirect(i, view_dir, normal, smoothness, custom_cubemap)).rgb;
+
+  return fixed4(saturate(pbr), albedo.a);
+}
+
+#endif  // __PBR_INC