New version of the samples and tutorials based on KHR_ray_tracing

2020-03-31 17:51:08 +02:00 · 2020-03-31 17:51:08 +02:00 · b6402f0c09
commit b6402f0c09
parent 2fd15056a2
271 changed files with 134108 additions and 2 deletions
--- a/common/obj_loader.cpp
+++ b/common/obj_loader.cpp
@ -0,0 +1,133 @@
+/******************************************************************************
+ * Copyright 1998-2018 NVIDIA Corp. All Rights Reserved.
+ *****************************************************************************/
+
+// This file exist only to do the implementation of tiny obj loader
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "obj_loader.h"
+#include "nvh/nvprint.hpp"
+
+//-----------------------------------------------------------------------------
+// Extract the directory component from a complete path.
+//
+#ifdef WIN32
+#define CORRECT_PATH_SEP "\\"
+#define WRONG_PATH_SEP '/'
+#else
+#define CORRECT_PATH_SEP "/"
+#define WRONG_PATH_SEP '\\'
+#endif
+
+static inline std::string get_path(const std::string& file)
+{
+  std::string dir;
+  size_t      idx = file.find_last_of("\\/");
+  if(idx != std::string::npos)
+    dir = file.substr(0, idx);
+  if(!dir.empty())
+  {
+    dir += CORRECT_PATH_SEP;
+  }
+  return dir;
+}
+
+void ObjLoader::loadModel(const std::string& filename)
+{
+  tinyobj::ObjReader reader;
+  reader.ParseFromFile(filename);
+  if(!reader.Valid())
+  {
+    LOGE(reader.Error().c_str());
+    std::cerr << "Cannot load: " << filename << std::endl;
+    assert(reader.Valid());
+  }
+
+  // Collecting the material in the scene
+  for(const auto& material : reader.GetMaterials())
+  {
+    MaterialObj m;
+    m.ambient  = nvmath::vec3f(material.ambient[0], material.ambient[1], material.ambient[2]);
+    m.diffuse  = nvmath::vec3f(material.diffuse[0], material.diffuse[1], material.diffuse[2]);
+    m.specular = nvmath::vec3f(material.specular[0], material.specular[1], material.specular[2]);
+    m.emission = nvmath::vec3f(material.emission[0], material.emission[1], material.emission[2]);
+    m.transmittance = nvmath::vec3f(material.transmittance[0], material.transmittance[1],
+                                    material.transmittance[2]);
+    m.dissolve      = material.dissolve;
+    m.ior           = material.ior;
+    m.shininess     = material.shininess;
+    m.illum         = material.illum;
+    if(!material.diffuse_texname.empty())
+    {
+      m_textures.push_back(material.diffuse_texname);
+      m.textureID = static_cast<int>(m_textures.size()) - 1;
+    }
+
+    m_materials.emplace_back(m);
+  }
+
+  // If there were none, add a default
+  if(m_materials.empty())
+    m_materials.emplace_back(MaterialObj());
+
+  const tinyobj::attrib_t& attrib = reader.GetAttrib();
+
+  for(const auto& shape : reader.GetShapes())
+  {
+    m_vertices.reserve(shape.mesh.indices.size() + m_vertices.size());
+    m_indices.reserve(shape.mesh.indices.size() + m_indices.size());
+    m_matIndx.insert(m_matIndx.end(), shape.mesh.material_ids.begin(),
+                     shape.mesh.material_ids.end());
+
+    for(const auto& index : shape.mesh.indices)
+    {
+      VertexObj    vertex = {};
+      const float* vp     = &attrib.vertices[3 * index.vertex_index];
+      vertex.pos          = {*(vp + 0), *(vp + 1), *(vp + 2)};
+
+      if(!attrib.normals.empty() && index.normal_index >= 0)
+      {
+        const float* np = &attrib.normals[3 * index.normal_index];
+        vertex.nrm      = {*(np + 0), *(np + 1), *(np + 2)};
+      }
+
+      if(!attrib.texcoords.empty() && index.texcoord_index >= 0)
+      {
+        const float* tp = &attrib.texcoords[2 * index.texcoord_index + 0];
+        vertex.texCoord = {*tp, 1.0f - *(tp + 1)};
+      }
+
+      if(!attrib.colors.empty())
+      {
+        const float* vc = &attrib.colors[3 * index.vertex_index];
+        vertex.color    = {*(vc + 0), *(vc + 1), *(vc + 2)};
+      }
+
+      m_vertices.push_back(vertex);
+      m_indices.push_back(static_cast<int>(m_indices.size()));
+    }
+  }
+
+  // Fixing material indices
+  for(auto& mi : m_matIndx)
+  {
+    if(mi < 0 || mi > m_materials.size())
+      mi = 0;
+  }
+
+
+  // Compute normal when no normal were provided.
+  if(attrib.normals.empty())
+  {
+    for(size_t i = 0; i < m_indices.size(); i += 3)
+    {
+      VertexObj& v0 = m_vertices[m_indices[i + 0]];
+      VertexObj& v1 = m_vertices[m_indices[i + 1]];
+      VertexObj& v2 = m_vertices[m_indices[i + 2]];
+
+      nvmath::vec3f n = nvmath::normalize(nvmath::cross((v1.pos - v0.pos), (v2.pos - v0.pos)));
+      v0.nrm          = n;
+      v1.nrm          = n;
+      v2.nrm          = n;
+    }
+  }
+}