Cycles microdisplacement: Support for Catmull-Clark subdivision via OpenSubdiv

Enables Catmull-Clark subdivision meshes with support for creases and attribute
subdivision. Still waiting on OpenSubdiv to fully support face varying
interpolation for subdividing uv coordinates tho. Also there may be some
inconsistencies with Blender's subdivision which will be resolved at a
later time.

Code for reading patch tables and creating patch maps is borrowed
from OpenSubdiv.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2111

1 files changed, 11 insertions, 0 deletions

diff --git a/intern/cycles/render/mesh.h b/intern/cycles/render/mesh.h
index c9ae9aab888..2436d6aa231 100644
--- a/intern/cycles/render/mesh.h
+++ b/intern/cycles/render/mesh.h
@@ -40,6 +40,7 @@ class Scene;
 class SceneParams;
 class AttributeRequest;
 class DiagSplit;
+struct PackedPatchTable;
 
 /* Mesh */
 
@@ -110,6 +111,11 @@ public:
 		int num_ptex_faces() const { return num_corners == 4 ? 1 : num_corners; }
 	};
 
+	struct SubdEdgeCrease {
+		int v[2];
+		float crease;
+	};
+
 	/* Displacement */
 	enum DisplacementMethod {
 		DISPLACE_BUMP = 0,
@@ -157,6 +163,8 @@ public:
 	array<int> subd_face_corners;
 	int num_ngons;
 
+	array<SubdEdgeCrease> subd_creases;
+
 	vector<Shader*> used_shaders;
 	AttributeSet attributes;
 	AttributeSet curve_attributes;
@@ -168,6 +176,8 @@ public:
 	Transform transform_normal;
 	DisplacementMethod displacement_method;
 
+	PackedPatchTable *patch_table;
+
 	uint motion_steps;
 	bool use_motion_blur;
 
@@ -184,6 +194,7 @@ public:
 	size_t curvekey_offset;
 
 	size_t patch_offset;
+	size_t patch_table_offset;
 	size_t face_offset;
 	size_t corner_offset;