271 lines
8.8 KiB
C++
271 lines
8.8 KiB
C++
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#include "thekla_atlas.h"
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#include <cfloat>
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#include "nvmesh/halfedge/Edge.h"
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#include "nvmesh/halfedge/Mesh.h"
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#include "nvmesh/halfedge/Face.h"
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#include "nvmesh/halfedge/Vertex.h"
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#include "nvmesh/param/Atlas.h"
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#include "nvmath/Vector.inl"
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#include "nvmath/ftoi.h"
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#include "nvcore/Array.inl"
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using namespace Thekla;
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using namespace nv;
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inline Atlas_Output_Mesh * set_error(Atlas_Error * error, Atlas_Error code) {
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if (error) *error = code;
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return NULL;
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}
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static void input_to_mesh(const Atlas_Input_Mesh * input, HalfEdge::Mesh * mesh, Atlas_Error * error) {
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Array<uint> canonicalMap;
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canonicalMap.reserve(input->vertex_count);
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for (int i = 0; i < input->vertex_count; i++) {
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const Atlas_Input_Vertex & input_vertex = input->vertex_array[i];
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const float * pos = input_vertex.position;
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const float * nor = input_vertex.normal;
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const float * tex = input_vertex.uv;
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HalfEdge::Vertex * vertex = mesh->addVertex(Vector3(pos[0], pos[1], pos[2]));
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vertex->nor.set(nor[0], nor[1], nor[2]);
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vertex->tex.set(tex[0], tex[1]);
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canonicalMap.append(input_vertex.first_colocal);
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}
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mesh->linkColocalsWithCanonicalMap(canonicalMap);
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const int face_count = input->face_count;
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int non_manifold_faces = 0;
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for (int i = 0; i < face_count; i++) {
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const Atlas_Input_Face & input_face = input->face_array[i];
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int v0 = input_face.vertex_index[0];
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int v1 = input_face.vertex_index[1];
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int v2 = input_face.vertex_index[2];
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HalfEdge::Face * face = mesh->addFace(v0, v1, v2);
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if (face != NULL) {
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face->material = input_face.material_index;
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}
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else {
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non_manifold_faces++;
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}
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}
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mesh->linkBoundary();
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if (non_manifold_faces != 0 && error != NULL) {
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*error = Atlas_Error_Invalid_Mesh_Non_Manifold;
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}
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}
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static Atlas_Output_Mesh * mesh_atlas_to_output(const HalfEdge::Mesh * mesh, const Atlas & atlas, Atlas_Error * error) {
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Atlas_Output_Mesh * output = new Atlas_Output_Mesh;
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const MeshCharts * charts = atlas.meshAt(0);
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// Allocate vertices.
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const int vertex_count = charts->vertexCount();
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output->vertex_count = vertex_count;
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output->vertex_array = new Atlas_Output_Vertex[vertex_count];
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int w = 0;
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int h = 0;
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// Output vertices.
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const int chart_count = charts->chartCount();
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for (int i = 0; i < chart_count; i++) {
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const Chart * chart = charts->chartAt(i);
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uint vertexOffset = charts->vertexCountBeforeChartAt(i);
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const uint chart_vertex_count = chart->vertexCount();
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for (uint v = 0; v < chart_vertex_count; v++) {
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Atlas_Output_Vertex & output_vertex = output->vertex_array[vertexOffset + v];
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uint original_vertex = chart->mapChartVertexToOriginalVertex(v);
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output_vertex.xref = original_vertex;
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Vector2 uv = chart->chartMesh()->vertexAt(v)->tex;
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output_vertex.uv[0] = uv.x;
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output_vertex.uv[1] = uv.y;
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w = max(w, ftoi_ceil(uv.x));
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h = max(h, ftoi_ceil(uv.y));
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}
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}
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const int face_count = mesh->faceCount();
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output->index_count = face_count * 3;
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output->index_array = new int[face_count * 3];
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// Set face indices.
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for (int f = 0; f < face_count; f++) {
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uint c = charts->faceChartAt(f);
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uint i = charts->faceIndexWithinChartAt(f);
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uint vertexOffset = charts->vertexCountBeforeChartAt(c);
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const Chart * chart = charts->chartAt(c);
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nvDebugCheck(chart->faceAt(i) == f);
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const HalfEdge::Face * face = chart->chartMesh()->faceAt(i);
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const HalfEdge::Edge * edge = face->edge;
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output->index_array[3*f+0] = vertexOffset + edge->vertex->id;
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output->index_array[3*f+1] = vertexOffset + edge->next->vertex->id;
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output->index_array[3*f+2] = vertexOffset + edge->next->next->vertex->id;
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}
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*error = Atlas_Error_Success;
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output->atlas_width = w;
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output->atlas_height = h;
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return output;
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}
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void Thekla::atlas_set_default_options(Atlas_Options * options) {
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if (options != NULL) {
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// These are the default values we use on The Witness.
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options->charter = Atlas_Charter_Default;
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options->charter_options.witness.proxy_fit_metric_weight = 2.0f;
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options->charter_options.witness.roundness_metric_weight = 0.01f;
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options->charter_options.witness.straightness_metric_weight = 6.0f;
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options->charter_options.witness.normal_seam_metric_weight = 4.0f;
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options->charter_options.witness.texture_seam_metric_weight = 0.5f;
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options->charter_options.witness.max_chart_area = FLT_MAX;
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options->charter_options.witness.max_boundary_length = FLT_MAX;
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options->mapper = Atlas_Mapper_Default;
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options->packer = Atlas_Packer_Default;
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options->packer_options.witness.packing_quality = 0;
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options->packer_options.witness.texel_area = 8;
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options->packer_options.witness.block_align = true;
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options->packer_options.witness.conservative = false;
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}
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}
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Atlas_Output_Mesh * Thekla::atlas_generate(const Atlas_Input_Mesh * input, const Atlas_Options * options, Atlas_Error * error) {
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// Validate args.
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if (input == NULL || options == NULL || error == NULL) return set_error(error, Atlas_Error_Invalid_Args);
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// Validate options.
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if (options->charter != Atlas_Charter_Witness) {
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return set_error(error, Atlas_Error_Invalid_Options);
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}
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if (options->charter == Atlas_Charter_Witness) {
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// @@ Validate input options!
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}
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if (options->mapper != Atlas_Mapper_LSCM) {
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return set_error(error, Atlas_Error_Invalid_Options);
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}
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if (options->mapper == Atlas_Mapper_LSCM) {
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// No options.
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}
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if (options->packer != Atlas_Packer_Witness) {
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return set_error(error, Atlas_Error_Invalid_Options);
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}
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if (options->packer == Atlas_Packer_Witness) {
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// @@ Validate input options!
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}
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// Validate input mesh.
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for (int i = 0; i < input->face_count; i++) {
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int v0 = input->face_array[i].vertex_index[0];
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int v1 = input->face_array[i].vertex_index[1];
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int v2 = input->face_array[i].vertex_index[2];
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if (v0 < 0 || v0 >= input->vertex_count ||
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v1 < 0 || v1 >= input->vertex_count ||
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v2 < 0 || v2 >= input->vertex_count)
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{
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return set_error(error, Atlas_Error_Invalid_Mesh);
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}
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}
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// Build half edge mesh.
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AutoPtr<HalfEdge::Mesh> mesh(new HalfEdge::Mesh);
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input_to_mesh(input, mesh.ptr(), error);
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if (*error == Atlas_Error_Invalid_Mesh) {
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return NULL;
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}
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Atlas atlas;
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// Charter.
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if (options->charter == Atlas_Charter_Extract) {
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return set_error(error, Atlas_Error_Not_Implemented);
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}
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else if (options->charter == Atlas_Charter_Witness) {
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SegmentationSettings segmentation_settings;
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segmentation_settings.proxyFitMetricWeight = options->charter_options.witness.proxy_fit_metric_weight;
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segmentation_settings.roundnessMetricWeight = options->charter_options.witness.roundness_metric_weight;
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segmentation_settings.straightnessMetricWeight = options->charter_options.witness.straightness_metric_weight;
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segmentation_settings.normalSeamMetricWeight = options->charter_options.witness.normal_seam_metric_weight;
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segmentation_settings.textureSeamMetricWeight = options->charter_options.witness.texture_seam_metric_weight;
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segmentation_settings.maxChartArea = options->charter_options.witness.max_chart_area;
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segmentation_settings.maxBoundaryLength = options->charter_options.witness.max_boundary_length;
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Array<uint> uncharted_materials;
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atlas.computeCharts(mesh.ptr(), segmentation_settings, uncharted_materials);
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}
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if (atlas.hasFailed())
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return NULL;
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// Mapper.
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if (options->mapper == Atlas_Mapper_LSCM) {
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atlas.parameterizeCharts();
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}
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if (atlas.hasFailed())
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return NULL;
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// Packer.
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if (options->packer == Atlas_Packer_Witness) {
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int packing_quality = options->packer_options.witness.packing_quality;
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float texel_area = options->packer_options.witness.texel_area;
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int block_align = options->packer_options.witness.block_align;
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int conservative = options->packer_options.witness.conservative;
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/*float utilization =*/ atlas.packCharts(packing_quality, texel_area, block_align, conservative);
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}
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if (atlas.hasFailed())
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return NULL;
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// Build output mesh.
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return mesh_atlas_to_output(mesh.ptr(), atlas, error);
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}
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void Thekla::atlas_free(Atlas_Output_Mesh * output) {
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if (output != NULL) {
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delete [] output->vertex_array;
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delete [] output->index_array;
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delete output;
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}
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}
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