1 files changed, 139 insertions, 0 deletions
diff --git a/Shaders/cloud/pbr.cginc b/Shaders/cloud/pbr.cginc
new file mode 100644
index 0000000..8b7405a
--- /dev/null
+++ b/Shaders/cloud/pbr.cginc
@@ -0,0 +1,139 @@
+#ifndef __PBR_INC__
+#define __PBR_INC__
+
+#include "AutoLight.cginc"
+#include "eyes_data.cginc"
+#include "UnityPBSLighting.cginc"
+
+float _Enable_Custom_Cubemap;
+UNITY_DECLARE_TEXCUBE(_Custom_Cubemap);
+
+sampler2D _Matcap;
+float _Matcap_Str;
+float _Enable_Matcap;
+float _Matcap_Mode;
+
+UnityIndirect GetIndirect(v2f i, float3 view_dir, float smoothness) {
+  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(i.normal, 1)));
+  float3 reflect_dir = reflect(-view_dir, i.normal);
+  // There's a nonlinear relationship between mipmap level and roughness.
+  float roughness = 1 - smoothness;
+  roughness *= 1.7 - .7 * roughness;
+  float3 env_sample;
+  if (_Enable_Custom_Cubemap) {
+    env_sample = UNITY_SAMPLE_TEXCUBE_LOD(
+        _Custom_Cubemap,
+        reflect_dir,
+        roughness * UNITY_SPECCUBE_LOD_STEPS);
+  } else {
+    env_sample = UNITY_SAMPLE_TEXCUBE_LOD(
+        unity_SpecCube0,
+        reflect_dir,
+        roughness * UNITY_SPECCUBE_LOD_STEPS);
+  }
+  if (_Enable_Matcap) {
+    // identity: (a, b, c) and (c, c, -(a +b)) are perpendicular to each other
+    float3 ortho_1 = normalize(float3(view_dir.z, view_dir.z, -(view_dir.y + view_dir.x)));
+    float3 ortho_2 = cross(view_dir, ortho_1);
+    float2 matcap_uv = (float2(dot(i.normal, ortho_1), dot(i.normal, ortho_2)) + 1) * .43;
+    float iddx = ddx(i.uv.x);
+    float iddy = ddy(i.uv.y);
+    float3 matcap = tex2Dgrad(_Matcap, matcap_uv, iddx, iddy) * _Matcap_Str;
+
+    int mode = round(_Matcap_Mode);
+    switch (mode) {
+      case 1:
+        indirect.specular = clamp(env_sample + matcap, 0, 1);
+        break;
+      case 2:
+        indirect.specular = clamp(env_sample * matcap, 0, 1);
+        break;
+      case 3:
+        indirect.specular = clamp(matcap, 0, 1);
+        break;
+      case 4:
+        indirect.specular = clamp(env_sample - matcap, 0, 1);
+        break;
+    }
+  } else {
+    indirect.specular = env_sample;
+  }
+  #endif
+
+  return indirect;
+}
+
+UnityLight GetLight(v2f i)
+{
+  UNITY_LIGHT_ATTENUATION(attenuation, 0, i.worldPos.xyz);
+  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 - i.worldPos);
+  #else
+  light.dir = _WorldSpaceLightPos0.xyz;
+  #endif
+  light.ndotl = DotClamped(i.normal, light.dir);
+
+  return light;
+}
+
+void initNormal(inout v2f i)
+{
+  i.normal = normalize(i.normal);
+}
+
+float4 light(inout v2f i,
+    float4 albedo,
+    float metallic,
+    float smoothness)
+{
+  initNormal(i);
+
+  float3 specular_tint;
+  float one_minus_reflectivity;
+  albedo.rgb = DiffuseAndSpecularFromMetallic(
+    albedo, metallic, specular_tint, one_minus_reflectivity);
+
+  float3 view_dir = normalize(_WorldSpaceCameraPos - i.worldPos);
+  float3 pbr = UNITY_BRDF_PBS(albedo,
+      specular_tint,
+      one_minus_reflectivity,
+      smoothness,
+      i.normal,
+      view_dir,
+      GetLight(i),
+      GetIndirect(i, view_dir, smoothness)).rgb;
+
+  return float4(saturate(pbr), albedo.a);
+}
+
+float getWorldSpaceDepth(in float4 world_pos)
+{
+  float4 clip_pos = mul(UNITY_MATRIX_VP, world_pos);
+  return LinearEyeDepth(clip_pos.z / clip_pos.w);
+}
+
+sampler2D _CameraDepthTexture;
+
+// Return depth buffer at coordinate, on [0, 1].
+float getDepthBufferAt(in float4 world_pos)
+{
+  float4 clip_pos = mul(UNITY_MATRIX_VP, world_pos);
+  float4 uv = ComputeGrabScreenPos(clip_pos);
+  return LinearEyeDepth(SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, uv.xy / uv.w));
+}
+
+#endif  // __PBR_INC__
+