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-rw-r--r--src/model/model.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/src/model/model.c b/src/model/model.c
new file mode 100644
index 0000000..b317f15
--- /dev/null
+++ b/src/model/model.c
@@ -0,0 +1,121 @@
+#include "model.h"
+
+static honey_mesh assimp_to_honey_mesh(struct aiMesh* mesh, struct aiScene* scene) {
+ unsigned int vertex_step = 6;
+ bool mesh_has_uvs = false;
+ unsigned int n_vertices = mesh->mNumVertices;
+
+ if (mesh->mTextureCoords[0]) {
+ mesh_has_uvs = true;
+ vertex_step = 8;
+ }
+
+ float* vertices = malloc(sizeof(float) * vertex_step * n_vertices);
+ for (int i=0; i<n_vertices; i++) {
+ int j = i*vertex_step;
+ /* positions */
+ vertices[j+0] = mesh->mVertices[i].x;
+ vertices[j+1] = mesh->mVertices[i].y;
+ vertices[j+2] = mesh->mVertices[i].z;
+
+ /* normals */
+ vertices[j+3] = mesh->mNormals[i].x;
+ vertices[j+4] = mesh->mNormals[i].y;
+ vertices[j+5] = mesh->mNormals[i].z;
+
+ /* uvs? */
+ if (mesh_has_uvs) {
+ vertices[j+6] = mesh->mTextureCoords[0][i].x;
+ vertices[j+7] = mesh->mTextureCoords[0][i].y;
+ }
+ }
+
+ unsigned int n_indices = mesh->mNumFaces*3;
+ unsigned int* indices = malloc(sizeof(unsigned int) * n_indices);
+ for (int i=0; i<mesh->mNumFaces; i++) {
+ int j = 3*i;
+ struct aiFace face = mesh->mFaces[i];
+ indices[j+0] = face.mIndices[0];
+ indices[j+1] = face.mIndices[1];
+ indices[j+2] = face.mIndices[2];
+ }
+
+ honey_mesh result;
+
+ if (mesh_has_uvs) {
+ unsigned int n_attributes = 3;
+ unsigned int attribute_sizes[] = { 3, 3, 2 };
+ honey_mesh_new(&result,
+ vertices, n_vertices,
+ n_attributes, attribute_sizes,
+ indices, n_indices);
+ }
+ else {
+ unsigned int n_attributes = 2;
+ unsigned int attribute_sizes[] = { 3, 3 };
+ honey_mesh_new(&result,
+ vertices, n_vertices,
+ n_attributes, attribute_sizes,
+ indices, n_indices);
+ }
+
+ free(vertices);
+ free(indices);
+
+ return result;
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+static void process_assimp_node(honey_model* model, struct aiNode* node, struct aiScene* scene) {
+ for (int i=0; i<node->mNumMeshes; i++) {
+ struct aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
+ model->meshes[model->n_meshes] = assimp_to_honey_mesh(mesh, scene);
+ model->n_meshes++;
+ }
+
+ for (int i=0; i<node->mNumChildren; i++) {
+ process_assimp_node(model, node->mChildren[i], scene);
+ }
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+honey_result honey_model_load(honey_model* model,
+ char* path) {
+ model->n_meshes = 0;
+
+ struct aiScene* scene = aiImportFile(path,
+ aiProcess_Triangulate |
+ aiProcess_FlipUVs);
+ if (scene == NULL) {
+ honey_error_set_string1(path);
+ return HONEY_FILE_READ_ERROR;
+ }
+
+ if (scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE ||
+ scene->mRootNode == NULL) {
+ honey_error_set_string1(path);
+ return HONEY_MODEL_LOAD_ERROR;
+ }
+
+ process_assimp_node(model, scene->mRootNode, scene);
+
+ return HONEY_OK;
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_model_draw(honey_model* model, honey_shader shader) {
+ for (int i=0; i<model->n_meshes; i++) {
+ honey_mesh_draw(model->meshes[i], shader);
+ }
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_model_delete(honey_model* model) {
+ for (int i=0; i<model->n_meshes; i++) {
+ honey_mesh_delete(model->meshes[i]);
+ }
+}