Cycles microdisplacement: Move call to tessellate() from addon to Cycles

By calling `tessellate()` from the mesh manager in Cycles we can do pre/post
processing or even threaded tessellation without concerning client side code
with the details.

intern/cycles/blender/blender_mesh.cpp

@@ -806,7 +806,10 @@ static void create_subd_mesh(Scene *scene,
 	}
 
 	/* set subd params */
-	SubdParams sdparams(mesh);
+	if(!mesh->subd_params) {
+		mesh->subd_params = new SubdParams(mesh);
+	}
+	SubdParams& sdparams = *mesh->subd_params;
 
 	PointerRNA cobj = RNA_pointer_get(&b_ob.ptr, "cycles");
 
@@ -816,10 +819,6 @@ static void create_subd_mesh(Scene *scene,
 	scene->camera->update();
 	sdparams.camera = scene->camera;
 	sdparams.objecttoworld = get_transform(b_ob.matrix_world());
-
-	/* tesselate */
-	DiagSplit dsplit(sdparams);
-	mesh->tessellate(&dsplit);
 }
 
 /* Sync */

intern/cycles/render/mesh.cpp

@@ -30,6 +30,7 @@
 
 #include "osl_globals.h"
 
+#include "subd_split.h"
 #include "subd_patch_table.h"
 
 #include "util_foreach.h"
@@ -172,6 +173,7 @@ Mesh::Mesh()
 	num_ngons = 0;
 
 	subdivision_type = SUBDIVISION_NONE;
+	subd_params = NULL;
 
 	patch_table = NULL;
 }
@@ -180,6 +182,7 @@ Mesh::~Mesh()
 {
 	delete bvh;
 	delete patch_table;
+	delete subd_params;
 }
 
 void Mesh::resize_mesh(int numverts, int numtris)
@@ -1659,6 +1662,42 @@ void MeshManager::device_update(Device *device, DeviceScene *dscene, Scene *scen
 		}
 	}
 
+	/* Tessellate meshes that are using subdivision */
+	size_t total_tess_needed = 0;
+	foreach(Mesh *mesh, scene->meshes) {
+		if(mesh->need_update &&
+		   mesh->subdivision_type != Mesh::SUBDIVISION_NONE &&
+		   mesh->num_subd_verts == 0 &&
+		   mesh->subd_params)
+		{
+			total_tess_needed++;
+		}
+	}
+
+	size_t i = 0;
+	foreach(Mesh *mesh, scene->meshes) {
+		if(mesh->need_update &&
+		   mesh->subdivision_type != Mesh::SUBDIVISION_NONE &&
+		   mesh->num_subd_verts == 0 &&
+		   mesh->subd_params)
+		{
+			string msg = "Tessellating ";
+			if(mesh->name == "")
+				msg += string_printf("%u/%u", (uint)(i+1), (uint)total_tess_needed);
+			else
+				msg += string_printf("%s %u/%u", mesh->name.c_str(), (uint)(i+1), (uint)total_tess_needed);
+
+			progress.set_status("Updating Mesh", msg);
+
+			DiagSplit dsplit(*mesh->subd_params);
+			mesh->tessellate(&dsplit);
+
+			i++;
+
+			if(progress.get_cancel()) return;
+		}
+	}
+
 	/* Update images needed for true displacement. */
 	bool true_displacement_used = false;
 	bool old_need_object_flags_update = false;
@@ -1719,7 +1758,7 @@ void MeshManager::device_update(Device *device, DeviceScene *dscene, Scene *scen
 	}
 
 	/* Update bvh. */
-	size_t i = 0, num_bvh = 0;
+	size_t num_bvh = 0;
 	foreach(Mesh *mesh, scene->meshes) {
 		if(mesh->need_update && mesh->need_build_bvh()) {
 			num_bvh++;
@@ -1728,6 +1767,7 @@ void MeshManager::device_update(Device *device, DeviceScene *dscene, Scene *scen
 
 	TaskPool pool;
 
+	i = 0;
 	foreach(Mesh *mesh, scene->meshes) {
 		if(mesh->need_update) {
 			pool.push(function_bind(&Mesh::compute_bvh,

intern/cycles/render/mesh.h

@@ -39,6 +39,7 @@ class Progress;
 class Scene;
 class SceneParams;
 class AttributeRequest;
+struct SubdParams;
 class DiagSplit;
 struct PackedPatchTable;
 
@@ -156,6 +157,8 @@ public:
 
 	array<SubdEdgeCrease> subd_creases;
 
+	SubdParams *subd_params;
+
 	vector<Shader*> used_shaders;
 	AttributeSet attributes;
 	AttributeSet curve_attributes;

intern/cycles/subd/CMakeLists.txt

@@ -22,6 +22,7 @@ set(SRC
 set(SRC_HEADERS
 	subd_dice.h
 	subd_patch.h
+	subd_patch_table.h
 	subd_split.h
 )