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/*
* Copyright 2011-2016 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mesh.h"
#include "attribute.h"
#include "subd_split.h"
#include "subd_patch.h"
#include "util_foreach.h"
CCL_NAMESPACE_BEGIN
void Mesh::tessellate(DiagSplit *split)
{
int num_faces = subd_faces.size();
Attribute *attr_vN = subd_attributes.find(ATTR_STD_VERTEX_NORMAL);
float3* vN = attr_vN->data_float3();
for(int f = 0; f < num_faces; f++) {
SubdFace& face = subd_faces[f];
if(face.is_quad()) {
/* quad */
LinearQuadPatch patch;
float3 *hull = patch.hull;
float3 *normals = patch.normals;
patch.patch_index = face.ptex_offset;
patch.shader = face.shader;
for(int i = 0; i < 4; i++) {
hull[i] = verts[subd_face_corners[face.start_corner+i]];
}
if(face.smooth) {
for(int i = 0; i < 4; i++) {
normals[i] = vN[subd_face_corners[face.start_corner+i]];
}
}
else {
float3 N = face.normal(this);
for(int i = 0; i < 4; i++) {
normals[i] = N;
}
}
swap(hull[2], hull[3]);
swap(normals[2], normals[3]);
/* Quad faces need to be split at least once to line up with split ngons, we do this
* here in this manner because if we do it later edge factors may end up slightly off.
*/
QuadDice::SubPatch subpatch;
subpatch.patch = &patch;
subpatch.P00 = make_float2(0.0f, 0.0f);
subpatch.P10 = make_float2(0.5f, 0.0f);
subpatch.P01 = make_float2(0.0f, 0.5f);
subpatch.P11 = make_float2(0.5f, 0.5f);
split->split_quad(&patch, &subpatch);
subpatch.P00 = make_float2(0.5f, 0.0f);
subpatch.P10 = make_float2(1.0f, 0.0f);
subpatch.P01 = make_float2(0.5f, 0.5f);
subpatch.P11 = make_float2(1.0f, 0.5f);
split->split_quad(&patch, &subpatch);
subpatch.P00 = make_float2(0.0f, 0.5f);
subpatch.P10 = make_float2(0.5f, 0.5f);
subpatch.P01 = make_float2(0.0f, 1.0f);
subpatch.P11 = make_float2(0.5f, 1.0f);
split->split_quad(&patch, &subpatch);
subpatch.P00 = make_float2(0.5f, 0.5f);
subpatch.P10 = make_float2(1.0f, 0.5f);
subpatch.P01 = make_float2(0.5f, 1.0f);
subpatch.P11 = make_float2(1.0f, 1.0f);
split->split_quad(&patch, &subpatch);
}
else {
/* ngon */
float3 center_vert = make_float3(0.0f, 0.0f, 0.0f);
float3 center_normal = make_float3(0.0f, 0.0f, 0.0f);
float inv_num_corners = 1.0f/float(face.num_corners);
for(int corner = 0; corner < face.num_corners; corner++) {
center_vert += verts[subd_face_corners[face.start_corner + corner]] * inv_num_corners;
center_normal += vN[subd_face_corners[face.start_corner + corner]] * inv_num_corners;
}
for(int corner = 0; corner < face.num_corners; corner++) {
LinearQuadPatch patch;
float3 *hull = patch.hull;
float3 *normals = patch.normals;
patch.patch_index = face.ptex_offset + corner;
patch.shader = face.shader;
hull[0] = verts[subd_face_corners[face.start_corner + mod(corner + 0, face.num_corners)]];
hull[1] = verts[subd_face_corners[face.start_corner + mod(corner + 1, face.num_corners)]];
hull[2] = verts[subd_face_corners[face.start_corner + mod(corner - 1, face.num_corners)]];
hull[3] = center_vert;
hull[1] = (hull[1] + hull[0]) * 0.5;
hull[2] = (hull[2] + hull[0]) * 0.5;
if(face.smooth) {
normals[0] = vN[subd_face_corners[face.start_corner + mod(corner + 0, face.num_corners)]];
normals[1] = vN[subd_face_corners[face.start_corner + mod(corner + 1, face.num_corners)]];
normals[2] = vN[subd_face_corners[face.start_corner + mod(corner - 1, face.num_corners)]];
normals[3] = center_normal;
normals[1] = (normals[1] + normals[0]) * 0.5;
normals[2] = (normals[2] + normals[0]) * 0.5;
}
else {
float3 N = face.normal(this);
for(int i = 0; i < 4; i++) {
normals[i] = N;
}
}
split->split_quad(&patch);
}
}
}
/* interpolate center points for attributes */
foreach(Attribute& attr, subd_attributes.attributes) {
char* data = attr.data();
size_t stride = attr.data_sizeof();
int ngons = 0;
switch(attr.element) {
case ATTR_ELEMENT_VERTEX: {
for(int f = 0; f < num_faces; f++) {
SubdFace& face = subd_faces[f];
if(!face.is_quad()) {
char* center = data + (verts.size() - num_subd_verts + ngons) * stride;
attr.zero_data(center);
float inv_num_corners = 1.0f / float(face.num_corners);
for(int corner = 0; corner < face.num_corners; corner++) {
attr.add_with_weight(center,
data + subd_face_corners[face.start_corner + corner] * stride,
inv_num_corners);
}
ngons++;
}
}
} break;
case ATTR_ELEMENT_VERTEX_MOTION: {
// TODO(mai): implement
} break;
case ATTR_ELEMENT_CORNER: {
for(int f = 0; f < num_faces; f++) {
SubdFace& face = subd_faces[f];
if(!face.is_quad()) {
char* center = data + (subd_face_corners.size() + ngons) * stride;
attr.zero_data(center);
float inv_num_corners = 1.0f / float(face.num_corners);
for(int corner = 0; corner < face.num_corners; corner++) {
attr.add_with_weight(center,
data + (face.start_corner + corner) * stride,
inv_num_corners);
}
ngons++;
}
}
} break;
case ATTR_ELEMENT_CORNER_BYTE: {
for(int f = 0; f < num_faces; f++) {
SubdFace& face = subd_faces[f];
if(!face.is_quad()) {
uchar* center = (uchar*)data + (subd_face_corners.size() + ngons) * stride;
float inv_num_corners = 1.0f / float(face.num_corners);
float4 val = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
for(int corner = 0; corner < face.num_corners; corner++) {
for(int i = 0; i < 4; i++) {
val[i] += float(*(data + (face.start_corner + corner) * stride + i)) * inv_num_corners;
}
}
for(int i = 0; i < 4; i++) {
center[i] = uchar(min(max(val[i], 0.0f), 255.0f));
}
ngons++;
}
}
} break;
default: break;
}
}
}
CCL_NAMESPACE_END
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