From 4ba03042354c520e420e1d30e46a31515e08960b Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 29 Feb 2020 03:47:46 +0100
Subject: Search for texture file in common path

---
 src/main.cpp | 52 ++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 10 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 87260cb..6fcd2a3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,6 @@
 #include <assert.h>
 #include <stdio.h>
+#include <sys/stat.h>
 
 #include <assimp/Importer.hpp>
 #include <assimp/postprocess.h>
@@ -10,7 +11,7 @@
 static void usage();
 static void file_write_error_check(FILE *file, const void *data, size_t size);
 static void file_write_uint_error_check(FILE *file, unsigned int value);
-static void process_node(const aiScene *scene, const aiNode *node, FILE *output_file);
+static void process_node(const aiScene *scene, const aiNode *node, FILE *output_file, const std::string &source_dir);
 
 int main(int argc, char **argv) {
     if(argc != 3)
@@ -37,7 +38,10 @@ int main(int argc, char **argv) {
     file_write_uint_error_check(destination_file, 0x036144AF);  // magic number
     file_write_uint_error_check(destination_file, 0x00000001);  // version
 
-    process_node(scene, scene->mRootNode, destination_file);
+    std::string source_dir = source_filepath;
+    source_dir = source_dir.substr(0, source_dir.find_last_of("/"));
+
+    process_node(scene, scene->mRootNode, destination_file, source_dir);
     fclose(destination_file);
     Assimp::DefaultLogger::kill();
     return 0;
@@ -63,7 +67,12 @@ void file_write_uint_error_check(FILE *file, unsigned int value) {
     }
 }
 
-static void process_mesh(const aiScene *scene, const aiMesh *mesh, FILE *output_file) {
+static bool is_file(const char *filename) {
+    struct stat filestat;
+    return stat(filename, &filestat) == 0 && S_ISREG(filestat.st_mode);
+}
+
+static void process_mesh(const aiScene *scene, const aiMesh *mesh, FILE *output_file, const std::string &source_dir) {
     // TODO: It seems like sometimes the vertice count doesn't match triangles.. excluding the last vertices in the list
     unsigned int vertice_overflow = mesh->mNumVertices % 3;
     unsigned int num_vertices = mesh->mNumVertices - vertice_overflow;
@@ -101,23 +110,46 @@ static void process_mesh(const aiScene *scene, const aiMesh *mesh, FILE *output_
             unsigned int num_textures_for_type = material->GetTextureCount(texture_types[i]);
             file_write_uint_error_check(output_file, num_textures_for_type);
             for(unsigned int j = 0; j < num_textures_for_type; ++j) {
-                aiString str;
-                if(material->GetTexture(texture_types[i], j, &str) == aiReturn_SUCCESS)
-                    file_write_error_check(output_file, str.data, str.length + 1); // +1 to include null-terminate character
-                else
+                aiString texture_name;
+                if(material->GetTexture(texture_types[i], j, &texture_name) == aiReturn_SUCCESS) {
+                    std::string texture_path = source_dir + "/";
+                    texture_path.append(texture_name.data, texture_name.length);
+                    // This is needed because it's common for models to use a directory called textures or Textures
+                    // and not specify it in the model file
+                    if(!is_file(texture_path.c_str())) {
+                        //fprintf(stderr, "Warning: texture not found: %s\n", texture_path.c_str());
+                        texture_path = source_dir + "/Textures/";
+                        texture_path.append(texture_name.data, texture_name.length);
+                        if(!is_file(texture_path.c_str())) {
+                            //fprintf(stderr, "Warning: texture not found: %s\n", texture_path.c_str());
+                            texture_path = source_dir + "/textures/";
+                            texture_path.append(texture_name.data, texture_name.length);
+                            if(!is_file(texture_path.c_str())) {
+                                fprintf(stderr, "Warning: texture not found: %s\n", texture_name.C_Str());
+                                file_write_error_check(output_file, "\0", 1);
+                                continue;
+                            }
+                        }
+                    }
+
+                    size_t dir_prefix_size = source_dir.size() + 1;
+                    // +1 to include null-terminate character
+                    file_write_error_check(output_file, texture_path.data() + dir_prefix_size, texture_path.size() + 1 - dir_prefix_size);
+                } else {
                     file_write_error_check(output_file, "\0", 1);
+                }
             }
         }
     }
 }
 
-void process_node(const aiScene *scene, const aiNode *node, FILE *output_file) {
+void process_node(const aiScene *scene, const aiNode *node, FILE *output_file, const std::string &source_dir) {
     for(unsigned int i = 0; i < node->mNumMeshes; ++i) {
         const aiMesh *mesh = scene->mMeshes[node->mMeshes[i]];
-        process_mesh(scene, mesh, output_file);
+        process_mesh(scene, mesh, output_file, source_dir);
     }
 
     for(unsigned int i = 0; i < node->mNumChildren; ++i) {
-        process_node(scene, node->mChildren[i], output_file);
+        process_node(scene, node->mChildren[i], output_file, source_dir);
     }
 }
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