From 8b8a84334f234b21945e8433ba3bd7d117ca69d9 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Fri, 28 Feb 2020 23:45:47 +0100
Subject: Initial commit, it works

---
 src/main.cpp | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 src/main.cpp

(limited to 'src/main.cpp')

diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..a679828
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,114 @@
+#include <assert.h>
+#include <stdio.h>
+
+#include <assimp/Importer.hpp>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/LogStream.hpp>
+
+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);
+
+int main(int argc, char **argv) {
+    if(argc != 3)
+        usage();
+
+    const char *source_filepath = argv[1];
+    const char *destination_filepath = argv[2];
+
+    Assimp::Logger::LogSeverity severity = Assimp::Logger::VERBOSE;
+	Assimp::DefaultLogger::create("", severity, aiDefaultLogStream_STDERR);
+
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(source_filepath, aiProcessPreset_TargetRealtime_Quality | aiProcess_Triangulate | aiProcess_FlipUVs);
+    if(!scene || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode) {
+        fprintf(stderr, "Failed to load file: %s, reason: %s\n", source_filepath, importer.GetErrorString());
+        exit(2);
+    }
+
+    FILE *destination_file = fopen(destination_filepath, "wb");
+    if(!destination_file) {
+        perror(destination_filepath);
+        exit(3);
+    }
+    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);
+    fclose(destination_file);
+    Assimp::DefaultLogger::kill();
+    return 0;
+}
+
+void usage() {
+    fprintf(stderr, "usage: amalgine-model-converter <source> <destination>\n");
+    exit(1);
+}
+
+void file_write_error_check(FILE *file, const void *data, size_t size) {
+    if(fwrite(data, 1, size, file) != size) {
+        fprintf(stderr, "Error: failed to write %ld bytes to output file, error: %s\n", size, strerror(errno));
+        exit(4);
+    }
+}
+
+void file_write_uint_error_check(FILE *file, unsigned int value) {
+    const size_t size = sizeof(value);
+    if(fwrite(&value, 1, size, file) != size) {
+        fprintf(stderr, "Error: failed to write %ld bytes to output file, error: %s\n", size, strerror(errno));
+        exit(4);
+    }
+}
+
+static void process_mesh(const aiScene *scene, const aiMesh *mesh, FILE *output_file) {
+    file_write_uint_error_check(output_file, mesh->mNumVertices);
+    file_write_error_check(output_file, &mesh->mVertices, mesh->mNumVertices * sizeof(aiVector3D));
+    file_write_error_check(output_file, &mesh->mNormals, mesh->mNumVertices * sizeof(aiVector3D));
+
+    file_write_uint_error_check(output_file, mesh->mNumFaces);
+    for(unsigned int i = 0; i < mesh->mNumFaces; ++i) {
+        // Should always be 3 since the file was loaded with aiProcess_Triangulate
+        file_write_error_check(output_file, mesh->mFaces[i].mIndices, 3 * sizeof(unsigned int));
+    }
+
+    file_write_uint_error_check(output_file, mesh->mTextureCoords[0] ? 1 : 0);
+    if(mesh->mTextureCoords[0])
+        file_write_error_check(output_file, &mesh->mTextureCoords[0], mesh->mNumVertices * sizeof(aiVector3D));
+
+    file_write_uint_error_check(output_file, mesh->mMaterialIndex < scene->mNumMaterials);
+    if(mesh->mMaterialIndex < scene->mNumMaterials) {
+        const unsigned int num_texture_types = 3;
+        const aiTextureType texture_types[num_texture_types] = {
+            aiTextureType_DIFFUSE,
+            aiTextureType_SPECULAR,
+            aiTextureType_AMBIENT
+        };
+
+        const aiMaterial *material = scene->mMaterials[mesh->mMaterialIndex];
+        for(unsigned int i = 0; i < num_texture_types; ++i) {
+            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
+                    file_write_error_check(output_file, "\0", 1);
+            }
+        }
+    }
+}
+
+void process_node(const aiScene *scene, const aiNode *node, FILE *output_file) {
+    for(unsigned int i = 0; i < node->mNumMeshes; ++i) {
+        const aiMesh *mesh = scene->mMeshes[node->mMeshes[i]];
+        process_mesh(scene, mesh, output_file);
+    }
+
+    for(unsigned int i = 0; i < node->mNumChildren; ++i) {
+        process_node(scene, node->mChildren[i], output_file);
+    }
+}
\ No newline at end of file
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