Begin sketching out tessellation feature

6 files changed, 101 insertions, 2 deletions

diff --git a/2ner.cginc b/2ner.cginc
index bc3813b..10b41a8 100644
--- a/2ner.cginc
+++ b/2ner.cginc
@@ -16,6 +16,7 @@
 #include "poi.cginc"

 #include "shatter_wave.cginc"

 #include "ssfd.cginc"

+#include "tessellation.cginc"

 #include "yum_brdf.cginc"

 #include "yum_pbr.cginc"

 #include "yum_lighting.cginc"

@@ -129,6 +130,9 @@ v2f vert(appdata v) {
   o.pos = UnityObjectToClipPos(v.vertex);

 #endif

 

+#if defined(_TESSELLATION)

+  o.tpos = v.vertex;

+#endif

   o.uv01.xy = v.uv0;

   o.uv01.zw = v.uv1;

 #if defined(_MIRROR_UVS_IN_MIRROR)

diff --git a/2ner.shader b/2ner.shader
index 9c38983..d6047e1 100644
--- a/2ner.shader
+++ b/2ner.shader
@@ -514,12 +514,20 @@ Shader "yum_food/2ner"
           _Shatter_Wave_Direction("Direction", Vector) = (0, 1, 0, 0)
         [HideInInspector] m_end_Shatter_Wave("Shatter wave", Float) = 0
 
-        //ifex _Mirror_UVs_In_Mirror==0
+        //ifex _Mirror_UVs_In_Mirror_Enabled==0
         [HideInInspector] m_start_Mirror_UVs_In_Mirror("Mirror UVs in mirror", Float) = 0
           [ThryToggle(_MIRROR_UVS_IN_MIRROR)] _Mirror_UVs_In_Mirror_Enabled("Enable", Float) = 0
         [HideInInspector] m_end_Mirror_UVs_In_Mirror("Mirror UVs in mirror", Float) = 0
         //endex
 
+        //ifex _Tessellation_Enabled==0
+        [HideInInspector] m_start_Tessellation("Tessellation", Float) = 0
+          [ThryToggle(_TESSELLATION)] _Tessellation_Enabled("Enable", Float) = 0
+          _Tessellation_Edge_Factors("Edge factors", Vector) = (1, 1, 1, 1)
+          _Tessellation_Inside_Factor("Inside factor", Float) = 1
+        [HideInInspector] m_end_Tessellation("Tessellation", Float) = 0
+        //endex
+
         //ifex _Vertex_Domain_Warping_Enabled==0
         [HideInInspector] m_start_Vertex_Domain_Warping("Vertex domain warping", Float) = 0
           [ThryToggle(_VERTEX_DOMAIN_WARPING)]_Vertex_Domain_Warping_Enabled("Enable", Float) = 0
@@ -977,6 +985,11 @@ Shader "yum_food/2ner"
       #pragma vertex vert
       #pragma fragment frag
 
+      //ifex _Tessellation_Enabled==0
+      #pragma hull hull
+      #pragma domain domain
+      //endex
+
       #define MASKED_STENCIL1_PASS
 
       #include "2ner.cginc"
diff --git a/features.cginc b/features.cginc
index 1b2b70a..163da78 100644
--- a/features.cginc
+++ b/features.cginc
@@ -200,9 +200,13 @@
 #pragma shader_feature_local _SHATTER_WAVE
 //endex
 
-//ifex _Mirror_UVs_In_Mirror==0
+//ifex _Mirror_UVs_In_Mirror_Enabled==0
 #pragma shader_feature_local _MIRROR_UVS_IN_MIRROR
 //endex
 
+//ifex _Tessellation_Enabled==0
+#pragma shader_feature_local _TESSELLATION
+//endex
+
 #endif  // __FEATURES_INC
 
diff --git a/globals.cginc b/globals.cginc
index d1fc5b6..ba223ee 100644
--- a/globals.cginc
+++ b/globals.cginc
@@ -424,4 +424,9 @@ float _Shatter_Wave_Power;
 float3 _Shatter_Wave_Direction;

 #endif  // _SHATTER_WAVE

 

+#if defined(_TESSELLATION)

+float3 _Tessellation_Edge_Factors;

+float _Tessellation_Inside_Factor;

+#endif  // _TESSELLATION

+

 #endif  // __GLOBALS_INC

diff --git a/interpolators.cginc b/interpolators.cginc
index 9db505c..b003abf 100644
--- a/interpolators.cginc
+++ b/interpolators.cginc
@@ -14,6 +14,9 @@ struct appdata {
 };

 

 struct v2f {

+#if defined(_TESSELLATION)

+	float4 tpos         : INTERNALTESSPOS;

+#endif

 	float4 pos         : SV_POSITION;

 	float4 uv01        : TEXCOORD0;

 	float3 objPos      : TEXCOORD1;

diff --git a/tessellation.cginc b/tessellation.cginc
new file mode 100644
index 0000000..c77cd83
--- /dev/null
+++ b/tessellation.cginc
@@ -0,0 +1,70 @@
+#ifndef __TESSELLATION_INC
+#define __TESSELLATION_INC
+
+#include "globals.cginc"
+#include "interpolators.cginc"
+
+//ifex _Tessellation_Enabled==0
+
+struct tess_factors {
+  float edge[3] : SV_TessFactor;
+  float inside : SV_InsideTessFactor;
+};
+
+tess_factors patch_constant(InputPatch<v2f, 3> patch) {
+  tess_factors f;
+#if defined(_TESSELLATION)
+  f.edge[0] = _Tessellation_Edge_Factors[0];
+  f.edge[1] = _Tessellation_Edge_Factors[1];
+  f.edge[2] = _Tessellation_Edge_Factors[2];
+  f.inside = _Tessellation_Inside_Factor;
+#else
+  f.edge[0] = 1;
+  f.edge[1] = 1;
+  f.edge[2] = 1;
+  f.inside = 1;
+#endif
+  return f;
+}
+
+[UNITY_domain("tri")]
+[UNITY_outputcontrolpoints(3)]
+[UNITY_outputtopology("triangle_cw")]
+[UNITY_partitioning("fractional_odd")]
+[UNITY_patchconstantfunc("patch_constant")]
+v2f hull(
+    InputPatch<v2f, 3> patch,
+    uint id : SV_OutputControlPointID)
+{
+  return patch[id];
+}
+
+[UNITY_domain("tri")]
+v2f domain(
+    tess_factors factors,
+    OutputPatch<v2f, 3> patch,
+    float3 baryc : SV_DomainLocation)
+{
+  v2f o;
+#define DOMAIN_INTERP(fieldName) \
+  patch[0].fieldName * baryc.x + \
+  patch[1].fieldName * baryc.y + \
+  patch[2].fieldName * baryc.z
+  o.pos      = DOMAIN_INTERP(pos);
+  o.uv01     = DOMAIN_INTERP(uv01);
+  o.objPos   = DOMAIN_INTERP(pos);
+  o.worldPos = DOMAIN_INTERP(worldPos);
+  o.normal   = DOMAIN_INTERP(normal);
+  o.tangent  = DOMAIN_INTERP(tangent);
+  o.binormal = DOMAIN_INTERP(binormal);
+  o.eyeVec   = DOMAIN_INTERP(eyeVec);
+
+  // TODO what about UNITY_LIGHTING_COORDS(7,8) and instance id and shit?
+  return o;
+}
+
+
+//endex
+
+#endif  // __TESSELLATION_INC
+